The Commons Collections ExtendedProperties.java source code
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.commons.collections;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.LineNumberReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.io.Reader;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.List;
import java.util.NoSuchElementException;
import java.util.Properties;
import java.util.StringTokenizer;
import java.util.Vector;
/**
* This class extends normal Java properties by adding the possibility
* to use the same key many times concatenating the value strings
* instead of overwriting them.
* <p>
* <b>Please consider using the PropertiesConfiguration class in
* Commons-Configuration as soon as it is released.</b>
* <p>
* The Extended Properties syntax is explained here:
*
* <ul>
* <li>
* Each property has the syntax <code>key = value
* </li>
* <li>
* The <i>key may use any character but the equal sign '='.
* </li>
* <li>
* <i>value may be separated on different lines if a backslash
* is placed at the end of the line that continues below.
* </li>
* <li>
* If <i>value is a list of strings, each token is separated
* by a comma ','.
* </li>
* <li>
* Commas in each token are escaped placing a backslash right before
* the comma.
* </li>
* <li>
* Backslashes are escaped by using two consecutive backslashes i.e. \\
* </li>
* <li>
* If a <i>key is used more than once, the values are appended
* as if they were on the same line separated with commas.
* </li>
* <li>
* Blank lines and lines starting with character '#' are skipped.
* </li>
* <li>
* If a property is named "include" (or whatever is defined by
* setInclude() and getInclude() and the value of that property is
* the full path to a file on disk, that file will be included into
* the ConfigurationsRepository. You can also pull in files relative
* to the parent configuration file. So if you have something
* like the following:
*
* include = additional.properties
*
* Then "additional.properties" is expected to be in the same
* directory as the parent configuration file.
*
* Duplicate name values will be replaced, so be careful.
*
* </li>
* </ul>
*
* <p>Here is an example of a valid extended properties file:
*
* <p>
* # lines starting with # are comments
*
* # This is the simplest property
* key = value
*
* # A long property may be separated on multiple lines
* longvalue = aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa \
* aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
*
* # This is a property with many tokens
* tokens_on_a_line = first token, second token
*
* # This sequence generates exactly the same result
* tokens_on_multiple_lines = first token
* tokens_on_multiple_lines = second token
*
* # commas may be escaped in tokens
* commas.escaped = Hi\, what'up?
* </pre>
*
* <p>NOTE: this class has not been written for
* performance nor low memory usage. In fact, it's way slower than it
* could be and generates too much memory garbage. But since
* performance is not an issue during intialization (and there is not
* much time to improve it), I wrote it this way. If you don't like
* it, go ahead and tune it up!
*
* @since Commons Collections 1.0
* @version $Revision: 646777 $ $Date: 2008-04-10 13:33:15 +0100 (Thu, 10 Apr 2008) $
*
* @author <a href="mailto:stefano@apache.org">Stefano Mazzocchi
* @author <a href="mailto:jon@latchkey.com">Jon S. Stevens
* @author <a href="mailto:daveb@miceda-data">Dave Bryson
* @author <a href="mailto:jvanzyl@periapt.com">Jason van Zyl
* @author <a href="mailto:geirm@optonline.net">Geir Magnusson Jr.
* @author <a href="mailto:leon@opticode.co.za">Leon Messerschmidt
* @author <a href="mailto:kjohnson@transparent.com">Kent Johnson
* @author <a href="mailto:dlr@finemaltcoding.com">Daniel Rall
* @author <a href="mailto:ipriha@surfeu.fi">Ilkka Priha
* @author Janek Bogucki
* @author Mohan Kishore
* @author Stephen Colebourne
* @author Shinobu Kawai
* @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen
*/
public class ExtendedProperties extends Hashtable {
/**
* Default configurations repository.
*/
private ExtendedProperties defaults;
/**
* The file connected to this repository (holding comments and
* such).
*
* @serial
*/
protected String file;
/**
* Base path of the configuration file used to create
* this ExtendedProperties object.
*/
protected String basePath;
/**
* File separator.
*/
protected String fileSeparator = System.getProperty("file.separator");
/**
* Has this configuration been intialized.
*/
protected boolean isInitialized = false;
/**
* This is the name of the property that can point to other
* properties file for including other properties files.
*/
protected static String include = "include";
/**
* These are the keys in the order they listed
* in the configuration file. This is useful when
* you wish to perform operations with configuration
* information in a particular order.
*/
protected ArrayList keysAsListed = new ArrayList();
protected final static String START_TOKEN="${";
protected final static String END_TOKEN="}";
/**
* Interpolate key names to handle ${key} stuff
*
* @param base string to interpolate
* @return returns the key name with the ${key} substituted
*/
protected String interpolate(String base) {
// COPIED from [configuration] 2003-12-29
return (interpolateHelper(base, null));
}
/**
* Recursive handler for multiple levels of interpolation.
*
* When called the first time, priorVariables should be null.
*
* @param base string with the ${key} variables
* @param priorVariables serves two purposes: to allow checking for
* loops, and creating a meaningful exception message should a loop
* occur. It's 0'th element will be set to the value of base from
* the first call. All subsequent interpolated variables are added
* afterward.
*
* @return the string with the interpolation taken care of
*/
protected String interpolateHelper(String base, List priorVariables) {
// COPIED from [configuration] 2003-12-29
if (base == null) {
return null;
}
// on the first call initialize priorVariables
// and add base as the first element
if (priorVariables == null) {
priorVariables = new ArrayList();
priorVariables.add(base);
}
int begin = -1;
int end = -1;
int prec = 0 - END_TOKEN.length();
String variable = null;
StringBuffer result = new StringBuffer();
// FIXME: we should probably allow the escaping of the start token
while (((begin = base.indexOf(START_TOKEN, prec + END_TOKEN.length())) > -1)
&& ((end = base.indexOf(END_TOKEN, begin)) > -1)) {
result.append(base.substring(prec + END_TOKEN.length(), begin));
variable = base.substring(begin + START_TOKEN.length(), end);
// if we've got a loop, create a useful exception message and throw
if (priorVariables.contains(variable)) {
String initialBase = priorVariables.remove(0).toString();
priorVariables.add(variable);
StringBuffer priorVariableSb = new StringBuffer();
// create a nice trace of interpolated variables like so:
// var1->var2->var3
for (Iterator it = priorVariables.iterator(); it.hasNext();) {
priorVariableSb.append(it.next());
if (it.hasNext()) {
priorVariableSb.append("->");
}
}
throw new IllegalStateException(
"infinite loop in property interpolation of " + initialBase + ": " + priorVariableSb.toString());
}
// otherwise, add this variable to the interpolation list.
else {
priorVariables.add(variable);
}
//QUESTION: getProperty or getPropertyDirect
Object value = getProperty(variable);
if (value != null) {
result.append(interpolateHelper(value.toString(), priorVariables));
// pop the interpolated variable off the stack
// this maintains priorVariables correctness for
// properties with multiple interpolations, e.g.
// prop.name=${some.other.prop1}/blahblah/${some.other.prop2}
priorVariables.remove(priorVariables.size() - 1);
} else if (defaults != null && defaults.getString(variable, null) != null) {
result.append(defaults.getString(variable));
} else {
//variable not defined - so put it back in the value
result.append(START_TOKEN).append(variable).append(END_TOKEN);
}
prec = end;
}
result.append(base.substring(prec + END_TOKEN.length(), base.length()));
return result.toString();
}
/**
* Inserts a backslash before every comma and backslash.
*/
private static String escape(String s) {
StringBuffer buf = new StringBuffer(s);
for (int i = 0; i < buf.length(); i++) {
char c = buf.charAt(i);
if (c == ',' || c == '\\') {
buf.insert(i, '\\');
i++;
}
}
return buf.toString();
}
/**
* Removes a backslash from every pair of backslashes.
*/
private static String unescape(String s) {
StringBuffer buf = new StringBuffer(s);
for (int i = 0; i < buf.length() - 1; i++) {
char c1 = buf.charAt(i);
char c2 = buf.charAt(i + 1);
if (c1 == '\\' && c2 == '\\') {
buf.deleteCharAt(i);
}
}
return buf.toString();
}
/**
* Counts the number of successive times 'ch' appears in the
* 'line' before the position indicated by the 'index'.
*/
private static int countPreceding(String line, int index, char ch) {
int i;
for (i = index - 1; i >= 0; i--) {
if (line.charAt(i) != ch) {
break;
}
}
return index - 1 - i;
}
/**
* Checks if the line ends with odd number of backslashes
*/
private static boolean endsWithSlash(String line) {
if (!line.endsWith("\\")) {
return false;
}
return (countPreceding(line, line.length() - 1, '\\') % 2 == 0);
}
/**
* This class is used to read properties lines. These lines do
* not terminate with new-line chars but rather when there is no
* backslash sign a the end of the line. This is used to
* concatenate multiple lines for readability.
*/
static class PropertiesReader extends LineNumberReader {
/**
* Constructor.
*
* @param reader A Reader.
*/
public PropertiesReader(Reader reader) {
super(reader);
}
/**
* Read a property.
*
* @return a String property
* @throws IOException if there is difficulty reading the source.
*/
public String readProperty() throws IOException {
StringBuffer buffer = new StringBuffer();
String line = readLine();
while (line != null) {
line = line.trim();
if ((line.length() != 0) && (line.charAt(0) != '#')) {
if (endsWithSlash(line)) {
line = line.substring(0, line.length() - 1);
buffer.append(line);
} else {
buffer.append(line);
return buffer.toString(); // normal method end
}
}
line = readLine();
}
return null; // EOF reached
}
}
/**
* This class divides into tokens a property value. Token
* separator is "," but commas into the property value are escaped
* using the backslash in front.
*/
static class PropertiesTokenizer extends StringTokenizer {
/**
* The property delimiter used while parsing (a comma).
*/
static final String DELIMITER = ",";
/**
* Constructor.
*
* @param string A String.
*/
public PropertiesTokenizer(String string) {
super(string, DELIMITER);
}
/**
* Check whether the object has more tokens.
*
* @return True if the object has more tokens.
*/
public boolean hasMoreTokens() {
return super.hasMoreTokens();
}
/**
* Get next token.
*
* @return A String.
*/
public String nextToken() {
StringBuffer buffer = new StringBuffer();
while (hasMoreTokens()) {
String token = super.nextToken();
if (endsWithSlash(token)) {
buffer.append(token.substring(0, token.length() - 1));
buffer.append(DELIMITER);
} else {
buffer.append(token);
break;
}
}
return buffer.toString().trim();
}
}
/**
* Creates an empty extended properties object.
*/
public ExtendedProperties() {
super();
}
/**
* Creates and loads the extended properties from the specified file.
*
* @param file the filename to load
* @throws IOException if a file error occurs
*/
public ExtendedProperties(String file) throws IOException {
this(file, null);
}
/**
* Creates and loads the extended properties from the specified file.
*
* @param file the filename to load
* @param defaultFile a second filename to load default values from
* @throws IOException if a file error occurs
*/
public ExtendedProperties(String file, String defaultFile) throws IOException {
this.file = file;
basePath = new File(file).getAbsolutePath();
basePath = basePath.substring(0, basePath.lastIndexOf(fileSeparator) + 1);
FileInputStream in = null;
try {
in = new FileInputStream(file);
this.load(in);
} finally {
try {
if (in != null) {
in.close();
}
} catch (IOException ex) {}
}
if (defaultFile != null) {
defaults = new ExtendedProperties(defaultFile);
}
}
/**
* Indicate to client code whether property
* resources have been initialized or not.
*/
public boolean isInitialized() {
return isInitialized;
}
/**
* Gets the property value for including other properties files.
* By default it is "include".
*
* @return A String.
*/
public String getInclude() {
return include;
}
/**
* Sets the property value for including other properties files.
* By default it is "include".
*
* @param inc A String.
*/
public void setInclude(String inc) {
include = inc;
}
/**
* Load the properties from the given input stream.
*
* @param input the InputStream to load from
* @throws IOException if an IO error occurs
*/
public void load(InputStream input) throws IOException {
load(input, null);
}
/**
* Load the properties from the given input stream
* and using the specified encoding.
*
* @param input the InputStream to load from
* @param enc the encoding to use
* @throws IOException if an IO error occurs
*/
public synchronized void load(InputStream input, String enc) throws IOException {
PropertiesReader reader = null;
if (enc != null) {
try {
reader = new PropertiesReader(new InputStreamReader(input, enc));
} catch (UnsupportedEncodingException ex) {
// Another try coming up....
}
}
if (reader == null) {
try {
reader = new PropertiesReader(new InputStreamReader(input, "8859_1"));
} catch (UnsupportedEncodingException ex) {
// ISO8859-1 support is required on java platforms but....
// If it's not supported, use the system default encoding
reader = new PropertiesReader(new InputStreamReader(input));
}
}
try {
while (true) {
String line = reader.readProperty();
if (line == null) {
return; // EOF
}
int equalSign = line.indexOf('=');
if (equalSign > 0) {
String key = line.substring(0, equalSign).trim();
String value = line.substring(equalSign + 1).trim();
// Configure produces lines like this ... just ignore them
if ("".equals(value)) {
continue;
}
if (getInclude() != null && key.equalsIgnoreCase(getInclude())) {
// Recursively load properties files.
File file = null;
if (value.startsWith(fileSeparator)) {
// We have an absolute path so we'll use this
file = new File(value);
} else {
// We have a relative path, and we have two
// possible forms here. If we have the "./" form
// then just strip that off first before continuing.
if (value.startsWith("." + fileSeparator)) {
value = value.substring(2);
}
file = new File(basePath + value);
}
if (file != null && file.exists() && file.canRead()) {
load(new FileInputStream(file));
}
} else {
addProperty(key, value);
}
}
}
} finally {
// Loading is initializing
isInitialized = true;
}
}
/**
* Gets a property from the configuration.
*
* @param key property to retrieve
* @return value as object. Will return user value if exists,
* if not then default value if exists, otherwise null
*/
public Object getProperty(String key) {
// first, try to get from the 'user value' store
Object obj = this.get(key);
if (obj == null) {
// if there isn't a value there, get it from the
// defaults if we have them
if (defaults != null) {
obj = defaults.get(key);
}
}
return obj;
}
/**
* Add a property to the configuration. If it already
* exists then the value stated here will be added
* to the configuration entry. For example, if
*
* <code>resource.loader = file
*
* is already present in the configuration and you
*
* <code>addProperty("resource.loader", "classpath")
*
* Then you will end up with a Vector like the
* following:
*
* <code>["file", "classpath"]
*
* @param key the key to add
* @param value the value to add
*/
public void addProperty(String key, Object value) {
if (value instanceof String) {
String str = (String) value;
if (str.indexOf(PropertiesTokenizer.DELIMITER) > 0) {
// token contains commas, so must be split apart then added
PropertiesTokenizer tokenizer = new PropertiesTokenizer(str);
while (tokenizer.hasMoreTokens()) {
String token = tokenizer.nextToken();
addPropertyInternal(key, unescape(token));
}
} else {
// token contains no commas, so can be simply added
addPropertyInternal(key, unescape(str));
}
} else {
addPropertyInternal(key, value);
}
// Adding a property connotes initialization
isInitialized = true;
}
/**
* Adds a key/value pair to the map. This routine does
* no magic morphing. It ensures the keylist is maintained
*
* @param key the key to store at
* @param value the decoded object to store
*/
private void addPropertyDirect(String key, Object value) {
// safety check
if (!containsKey(key)) {
keysAsListed.add(key);
}
put(key, value);
}
/**
* Adds a decoded property to the map w/o checking for commas - used
* internally when a property has been broken up into
* strings that could contain escaped commas to prevent
* the inadvertent vectorization.
* <p>
* Thanks to Leon Messerschmidt for this one.
*
* @param key the key to store at
* @param value the decoded object to store
*/
private void addPropertyInternal(String key, Object value) {
Object current = this.get(key);
if (current instanceof String) {
// one object already in map - convert it to a vector
List values = new Vector(2);
values.add(current);
values.add(value);
put(key, values);
} else if (current instanceof List) {
// already a list - just add the new token
((List) current).add(value);
} else {
// brand new key - store in keysAsListed to retain order
if (!containsKey(key)) {
keysAsListed.add(key);
}
put(key, value);
}
}
/**
* Set a property, this will replace any previously
* set values. Set values is implicitly a call
* to clearProperty(key), addProperty(key,value).
*
* @param key the key to set
* @param value the value to set
*/
public void setProperty(String key, Object value) {
clearProperty(key);
addProperty(key, value);
}
/**
* Save the properties to the given output stream.
* <p>
* The stream is not closed, but it is flushed.
*
* @param output an OutputStream, may be null
* @param header a textual comment to act as a file header
* @throws IOException if an IO error occurs
*/
public synchronized void save(OutputStream output, String header) throws IOException {
if (output == null) {
return;
}
PrintWriter theWrtr = new PrintWriter(output);
if (header != null) {
theWrtr.println(header);
}
Enumeration theKeys = keys();
while (theKeys.hasMoreElements()) {
String key = (String) theKeys.nextElement();
Object value = get(key);
if (value != null) {
if (value instanceof String) {
StringBuffer currentOutput = new StringBuffer();
currentOutput.append(key);
currentOutput.append("=");
currentOutput.append(escape((String) value));
theWrtr.println(currentOutput.toString());
} else if (value instanceof List) {
List values = (List) value;
for (Iterator it = values.iterator(); it.hasNext(); ) {
String currentElement = (String) it.next();
StringBuffer currentOutput = new StringBuffer();
currentOutput.append(key);
currentOutput.append("=");
currentOutput.append(escape(currentElement));
theWrtr.println(currentOutput.toString());
}
}
}
theWrtr.println();
theWrtr.flush();
}
}
/**
* Combines an existing Hashtable with this Hashtable.
* <p>
* Warning: It will overwrite previous entries without warning.
*
* @param props the properties to combine
*/
public void combine(ExtendedProperties props) {
for (Iterator it = props.getKeys(); it.hasNext();) {
String key = (String) it.next();
setProperty(key, props.get(key));
}
}
/**
* Clear a property in the configuration.
*
* @param key the property key to remove along with corresponding value
*/
public void clearProperty(String key) {
if (containsKey(key)) {
// we also need to rebuild the keysAsListed or else
// things get *very* confusing
for (int i = 0; i < keysAsListed.size(); i++) {
if (( keysAsListed.get(i)).equals(key)) {
keysAsListed.remove(i);
break;
}
}
remove(key);
}
}
/**
* Get the list of the keys contained in the configuration
* repository.
*
* @return an Iterator over the keys
*/
public Iterator getKeys() {
return keysAsListed.iterator();
}
/**
* Get the list of the keys contained in the configuration
* repository that match the specified prefix.
*
* @param prefix the prefix to match
* @return an Iterator of keys that match the prefix
*/
public Iterator getKeys(String prefix) {
Iterator keys = getKeys();
ArrayList matchingKeys = new ArrayList();
while (keys.hasNext()) {
Object key = keys.next();
if (key instanceof String && ((String) key).startsWith(prefix)) {
matchingKeys.add(key);
}
}
return matchingKeys.iterator();
}
/**
* Create an ExtendedProperties object that is a subset
* of this one. Take into account duplicate keys
* by using the setProperty() in ExtendedProperties.
*
* @param prefix the prefix to get a subset for
* @return a new independent ExtendedProperties
*/
public ExtendedProperties subset(String prefix) {
ExtendedProperties c = new ExtendedProperties();
Iterator keys = getKeys();
boolean validSubset = false;
while (keys.hasNext()) {
Object key = keys.next();
if (key instanceof String && ((String) key).startsWith(prefix)) {
if (!validSubset) {
validSubset = true;
}
/*
* Check to make sure that c.subset(prefix) doesn't
* blow up when there is only a single property
* with the key prefix. This is not a useful
* subset but it is a valid subset.
*/
String newKey = null;
if (((String) key).length() == prefix.length()) {
newKey = prefix;
} else {
newKey = ((String) key).substring(prefix.length() + 1);
}
/*
* use addPropertyDirect() - this will plug the data as
* is into the Map, but will also do the right thing
* re key accounting
*/
c.addPropertyDirect(newKey, get(key));
}
}
if (validSubset) {
return c;
} else {
return null;
}
}
/**
* Display the configuration for debugging purposes to System.out.
*/
public void display() {
Iterator i = getKeys();
while (i.hasNext()) {
String key = (String) i.next();
Object value = get(key);
System.out.println(key + " => " + value);
}
}
/**
* Get a string associated with the given configuration key.
*
* @param key The configuration key.
* @return The associated string.
* @throws ClassCastException is thrown if the key maps to an
* object that is not a String.
*/
public String getString(String key) {
return getString(key, null);
}
/**
* Get a string associated with the given configuration key.
*
* @param key The configuration key.
* @param defaultValue The default value.
* @return The associated string if key is found,
* default value otherwise.
* @throws ClassCastException is thrown if the key maps to an
* object that is not a String.
*/
public String getString(String key, String defaultValue) {
Object value = get(key);
if (value instanceof String) {
return interpolate((String) value);
} else if (value == null) {
if (defaults != null) {
return interpolate(defaults.getString(key, defaultValue));
} else {
return interpolate(defaultValue);
}
} else if (value instanceof List) {
return interpolate((String) ((List) value).get(0));
} else {
throw new ClassCastException('\'' + key + "' doesn't map to a String object");
}
}
/**
* Get a list of properties associated with the given
* configuration key.
*
* @param key The configuration key.
* @return The associated properties if key is found.
* @throws ClassCastException is thrown if the key maps to an
* object that is not a String/List.
* @throws IllegalArgumentException if one of the tokens is
* malformed (does not contain an equals sign).
*/
public Properties getProperties(String key) {
return getProperties(key, new Properties());
}
/**
* Get a list of properties associated with the given
* configuration key.
*
* @param key The configuration key.
* @return The associated properties if key is found.
* @throws ClassCastException is thrown if the key maps to an
* object that is not a String/List.
* @throws IllegalArgumentException if one of the tokens is
* malformed (does not contain an equals sign).
*/
public Properties getProperties(String key, Properties defaults) {
/*
* Grab an array of the tokens for this key.
*/
String[] tokens = getStringArray(key);
// Each token is of the form 'key=value'.
Properties props = new Properties(defaults);
for (int i = 0; i < tokens.length; i++) {
String token = tokens[i];
int equalSign = token.indexOf('=');
if (equalSign > 0) {
String pkey = token.substring(0, equalSign).trim();
String pvalue = token.substring(equalSign + 1).trim();
props.put(pkey, pvalue);
} else {
throw new IllegalArgumentException('\'' + token + "' does not contain " + "an equals sign");
}
}
return props;
}
/**
* Get an array of strings associated with the given configuration
* key.
*
* @param key The configuration key.
* @return The associated string array if key is found.
* @throws ClassCastException is thrown if the key maps to an
* object that is not a String/List.
*/
public String[] getStringArray(String key) {
Object value = get(key);
List values;
if (value instanceof String) {
values = new Vector(1);
values.add(value);
} else if (value instanceof List) {
values = (List) value;
} else if (value == null) {
if (defaults != null) {
return defaults.getStringArray(key);
} else {
return new String[0];
}
} else {
throw new ClassCastException('\'' + key + "' doesn't map to a String/List object");
}
String[] tokens = new String[values.size()];
for (int i = 0; i < tokens.length; i++) {
tokens[i] = (String) values.get(i);
}
return tokens;
}
/**
* Get a Vector of strings associated with the given configuration
* key.
*
* @param key The configuration key.
* @return The associated Vector.
* @throws ClassCastException is thrown if the key maps to an
* object that is not a Vector.
*/
public Vector getVector(String key) {
return getVector(key, null);
}
/**
* Get a Vector of strings associated with the given configuration key.
* <p>
* The list is a copy of the internal data of this object, and as
* such you may alter it freely.
*
* @param key The configuration key.
* @param defaultValue The default value.
* @return The associated Vector.
* @throws ClassCastException is thrown if the key maps to an
* object that is not a Vector.
*/
public Vector getVector(String key, Vector defaultValue) {
Object value = get(key);
if (value instanceof List) {
return new Vector((List) value);
} else if (value instanceof String) {
Vector values = new Vector(1);
values.add(value);
put(key, values);
return values;
} else if (value == null) {
if (defaults != null) {
return defaults.getVector(key, defaultValue);
} else {
return ((defaultValue == null) ? new Vector() : defaultValue);
}
} else {
throw new ClassCastException('\'' + key + "' doesn't map to a Vector object");
}
}
/**
* Get a List of strings associated with the given configuration key.
* <p>
* The list is a copy of the internal data of this object, and as
* such you may alter it freely.
*
* @param key The configuration key.
* @return The associated List object.
* @throws ClassCastException is thrown if the key maps to an
* object that is not a List.
* @since Commons Collections 3.2
*/
public List getList(String key) {
return getList(key, null);
}
/**
* Get a List of strings associated with the given configuration key.
* <p>
* The list is a copy of the internal data of this object, and as
* such you may alter it freely.
*
* @param key The configuration key.
* @param defaultValue The default value.
* @return The associated List.
* @throws ClassCastException is thrown if the key maps to an
* object that is not a List.
* @since Commons Collections 3.2
*/
public List getList(String key, List defaultValue) {
Object value = get(key);
if (value instanceof List) {
return new ArrayList((List) value);
} else if (value instanceof String) {
List values = new ArrayList(1);
values.add(value);
put(key, values);
return values;
} else if (value == null) {
if (defaults != null) {
return defaults.getList(key, defaultValue);
} else {
return ((defaultValue == null) ? new ArrayList() : defaultValue);
}
} else {
throw new ClassCastException('\'' + key + "' doesn't map to a List object");
}
}
/**
* Get a boolean associated with the given configuration key.
*
* @param key The configuration key.
* @return The associated boolean.
* @throws NoSuchElementException is thrown if the key doesn't
* map to an existing object.
* @throws ClassCastException is thrown if the key maps to an
* object that is not a Boolean.
*/
public boolean getBoolean(String key) {
Boolean b = getBoolean(key, null);
if (b != null) {
return b.booleanValue();
} else {
throw new NoSuchElementException('\'' + key + "' doesn't map to an existing object");
}
}
/**
* Get a boolean associated with the given configuration key.
*
* @param key The configuration key.
* @param defaultValue The default value.
* @return The associated boolean.
* @throws ClassCastException is thrown if the key maps to an
* object that is not a Boolean.
*/
public boolean getBoolean(String key, boolean defaultValue) {
return getBoolean(key, new Boolean(defaultValue)).booleanValue();
}
/**
* Get a boolean associated with the given configuration key.
*
* @param key The configuration key.
* @param defaultValue The default value.
* @return The associated boolean if key is found and has valid
* format, default value otherwise.
* @throws ClassCastException is thrown if the key maps to an
* object that is not a Boolean.
*/
public Boolean getBoolean(String key, Boolean defaultValue) {
Object value = get(key);
if (value instanceof Boolean) {
return (Boolean) value;
} else if (value instanceof String) {
String s = testBoolean((String) value);
Boolean b = new Boolean(s);
put(key, b);
return b;
} else if (value == null) {
if (defaults != null) {
return defaults.getBoolean(key, defaultValue);
} else {
return defaultValue;
}
} else {
throw new ClassCastException('\'' + key + "' doesn't map to a Boolean object");
}
}
/**
* Test whether the string represent by value maps to a boolean
* value or not. We will allow <code>true, on,
* and <code>yes for a true boolean value, and
* <code>false, off, and no for
* <code>false boolean values. Case of value to test for
* boolean status is ignored.
*
* @param value the value to test for boolean state
* @return <code>true or false if the supplied
* text maps to a boolean value, or <code>null otherwise.
*/
public String testBoolean(String value) {
String s = value.toLowerCase();
if (s.equals("true") || s.equals("on") || s.equals("yes")) {
return "true";
} else if (s.equals("false") || s.equals("off") || s.equals("no")) {
return "false";
} else {
return null;
}
}
/**
* Get a byte associated with the given configuration key.
*
* @param key The configuration key.
* @return The associated byte.
* @throws NoSuchElementException is thrown if the key doesn't
* map to an existing object.
* @throws ClassCastException is thrown if the key maps to an
* object that is not a Byte.
* @throws NumberFormatException is thrown if the value mapped
* by the key has not a valid number format.
*/
public byte getByte(String key) {
Byte b = getByte(key, null);
if (b != null) {
return b.byteValue();
} else {
throw new NoSuchElementException('\'' + key + " doesn't map to an existing object");
}
}
/**
* Get a byte associated with the given configuration key.
*
* @param key The configuration key.
* @param defaultValue The default value.
* @return The associated byte.
* @throws ClassCastException is thrown if the key maps to an
* object that is not a Byte.
* @throws NumberFormatException is thrown if the value mapped
* by the key has not a valid number format.
*/
public byte getByte(String key, byte defaultValue) {
return getByte(key, new Byte(defaultValue)).byteValue();
}
/**
* Get a byte associated with the given configuration key.
*
* @param key The configuration key.
* @param defaultValue The default value.
* @return The associated byte if key is found and has valid
* format, default value otherwise.
* @throws ClassCastException is thrown if the key maps to an
* object that is not a Byte.
* @throws NumberFormatException is thrown if the value mapped
* by the key has not a valid number format.
*/
public Byte getByte(String key, Byte defaultValue) {
Object value = get(key);
if (value instanceof Byte) {
return (Byte) value;
} else if (value instanceof String) {
Byte b = new Byte((String) value);
put(key, b);
return b;
} else if (value == null) {
if (defaults != null) {
return defaults.getByte(key, defaultValue);
} else {
return defaultValue;
}
} else {
throw new ClassCastException('\'' + key + "' doesn't map to a Byte object");
}
}
/**
* Get a short associated with the given configuration key.
*
* @param key The configuration key.
* @return The associated short.
* @throws NoSuchElementException is thrown if the key doesn't
* map to an existing object.
* @throws ClassCastException is thrown if the key maps to an
* object that is not a Short.
* @throws NumberFormatException is thrown if the value mapped
* by the key has not a valid number format.
*/
public short getShort(String key) {
Short s = getShort(key, null);
if (s != null) {
return s.shortValue();
} else {
throw new NoSuchElementException('\'' + key + "' doesn't map to an existing object");
}
}
/**
* Get a short associated with the given configuration key.
*
* @param key The configuration key.
* @param defaultValue The default value.
* @return The associated short.
* @throws ClassCastException is thrown if the key maps to an
* object that is not a Short.
* @throws NumberFormatException is thrown if the value mapped
* by the key has not a valid number format.
*/
public short getShort(String key, short defaultValue) {
return getShort(key, new Short(defaultValue)).shortValue();
}
/**
* Get a short associated with the given configuration key.
*
* @param key The configuration key.
* @param defaultValue The default value.
* @return The associated short if key is found and has valid
* format, default value otherwise.
* @throws ClassCastException is thrown if the key maps to an
* object that is not a Short.
* @throws NumberFormatException is thrown if the value mapped
* by the key has not a valid number format.
*/
public Short getShort(String key, Short defaultValue) {
Object value = get(key);
if (value instanceof Short) {
return (Short) value;
} else if (value instanceof String) {
Short s = new Short((String) value);
put(key, s);
return s;
} else if (value == null) {
if (defaults != null) {
return defaults.getShort(key, defaultValue);
} else {
return defaultValue;
}
} else {
throw new ClassCastException('\'' + key + "' doesn't map to a Short object");
}
}
/**
* The purpose of this method is to get the configuration resource
* with the given name as an integer.
*
* @param name The resource name.
* @return The value of the resource as an integer.
*/
public int getInt(String name) {
return getInteger(name);
}
/**
* The purpose of this method is to get the configuration resource
* with the given name as an integer, or a default value.
*
* @param name The resource name
* @param def The default value of the resource.
* @return The value of the resource as an integer.
*/
public int getInt(String name, int def) {
return getInteger(name, def);
}
/**
* Get a int associated with the given configuration key.
*
* @param key The configuration key.
* @return The associated int.
* @throws NoSuchElementException is thrown if the key doesn't
* map to an existing object.
* @throws ClassCastException is thrown if the key maps to an
* object that is not a Integer.
* @throws NumberFormatException is thrown if the value mapped
* by the key has not a valid number format.
*/
public int getInteger(String key) {
Integer i = getInteger(key, null);
if (i != null) {
return i.intValue();
} else {
throw new NoSuchElementException('\'' + key + "' doesn't map to an existing object");
}
}
/**
* Get a int associated with the given configuration key.
*
* @param key The configuration key.
* @param defaultValue The default value.
* @return The associated int.
* @throws ClassCastException is thrown if the key maps to an
* object that is not a Integer.
* @throws NumberFormatException is thrown if the value mapped
* by the key has not a valid number format.
*/
public int getInteger(String key, int defaultValue) {
Integer i = getInteger(key, null);
if (i == null) {
return defaultValue;
}
return i.intValue();
}
/**
* Get a int associated with the given configuration key.
*
* @param key The configuration key.
* @param defaultValue The default value.
* @return The associated int if key is found and has valid
* format, default value otherwise.
* @throws ClassCastException is thrown if the key maps to an
* object that is not a Integer.
* @throws NumberFormatException is thrown if the value mapped
* by the key has not a valid number format.
*/
public Integer getInteger(String key, Integer defaultValue) {
Object value = get(key);
if (value instanceof Integer) {
return (Integer) value;
} else if (value instanceof String) {
Integer i = new Integer((String) value);
put(key, i);
return i;
} else if (value == null) {
if (defaults != null) {
return defaults.getInteger(key, defaultValue);
} else {
return defaultValue;
}
} else {
throw new ClassCastException('\'' + key + "' doesn't map to a Integer object");
}
}
/**
* Get a long associated with the given configuration key.
*
* @param key The configuration key.
* @return The associated long.
* @throws NoSuchElementException is thrown if the key doesn't
* map to an existing object.
* @throws ClassCastException is thrown if the key maps to an
* object that is not a Long.
* @throws NumberFormatException is thrown if the value mapped
* by the key has not a valid number format.
*/
public long getLong(String key) {
Long l = getLong(key, null);
if (l != null) {
return l.longValue();
} else {
throw new NoSuchElementException('\'' + key + "' doesn't map to an existing object");
}
}
/**
* Get a long associated with the given configuration key.
*
* @param key The configuration key.
* @param defaultValue The default value.
* @return The associated long.
* @throws ClassCastException is thrown if the key maps to an
* object that is not a Long.
* @throws NumberFormatException is thrown if the value mapped
* by the key has not a valid number format.
*/
public long getLong(String key, long defaultValue) {
return getLong(key, new Long(defaultValue)).longValue();
}
/**
* Get a long associated with the given configuration key.
*
* @param key The configuration key.
* @param defaultValue The default value.
* @return The associated long if key is found and has valid
* format, default value otherwise.
* @throws ClassCastException is thrown if the key maps to an
* object that is not a Long.
* @throws NumberFormatException is thrown if the value mapped
* by the key has not a valid number format.
*/
public Long getLong(String key, Long defaultValue) {
Object value = get(key);
if (value instanceof Long) {
return (Long) value;
} else if (value instanceof String) {
Long l = new Long((String) value);
put(key, l);
return l;
} else if (value == null) {
if (defaults != null) {
return defaults.getLong(key, defaultValue);
} else {
return defaultValue;
}
} else {
throw new ClassCastException('\'' + key + "' doesn't map to a Long object");
}
}
/**
* Get a float associated with the given configuration key.
*
* @param key The configuration key.
* @return The associated float.
* @throws NoSuchElementException is thrown if the key doesn't
* map to an existing object.
* @throws ClassCastException is thrown if the key maps to an
* object that is not a Float.
* @throws NumberFormatException is thrown if the value mapped
* by the key has not a valid number format.
*/
public float getFloat(String key) {
Float f = getFloat(key, null);
if (f != null) {
return f.floatValue();
} else {
throw new NoSuchElementException('\'' + key + "' doesn't map to an existing object");
}
}
/**
* Get a float associated with the given configuration key.
*
* @param key The configuration key.
* @param defaultValue The default value.
* @return The associated float.
* @throws ClassCastException is thrown if the key maps to an
* object that is not a Float.
* @throws NumberFormatException is thrown if the value mapped
* by the key has not a valid number format.
*/
public float getFloat(String key, float defaultValue) {
return getFloat(key, new Float(defaultValue)).floatValue();
}
/**
* Get a float associated with the given configuration key.
*
* @param key The configuration key.
* @param defaultValue The default value.
* @return The associated float if key is found and has valid
* format, default value otherwise.
* @throws ClassCastException is thrown if the key maps to an
* object that is not a Float.
* @throws NumberFormatException is thrown if the value mapped
* by the key has not a valid number format.
*/
public Float getFloat(String key, Float defaultValue) {
Object value = get(key);
if (value instanceof Float) {
return (Float) value;
} else if (value instanceof String) {
Float f = new Float((String) value);
put(key, f);
return f;
} else if (value == null) {
if (defaults != null) {
return defaults.getFloat(key, defaultValue);
} else {
return defaultValue;
}
} else {
throw new ClassCastException('\'' + key + "' doesn't map to a Float object");
}
}
/**
* Get a double associated with the given configuration key.
*
* @param key The configuration key.
* @return The associated double.
* @throws NoSuchElementException is thrown if the key doesn't
* map to an existing object.
* @throws ClassCastException is thrown if the key maps to an
* object that is not a Double.
* @throws NumberFormatException is thrown if the value mapped
* by the key has not a valid number format.
*/
public double getDouble(String key) {
Double d = getDouble(key, null);
if (d != null) {
return d.doubleValue();
} else {
throw new NoSuchElementException('\'' + key + "' doesn't map to an existing object");
}
}
/**
* Get a double associated with the given configuration key.
*
* @param key The configuration key.
* @param defaultValue The default value.
* @return The associated double.
* @throws ClassCastException is thrown if the key maps to an
* object that is not a Double.
* @throws NumberFormatException is thrown if the value mapped
* by the key has not a valid number format.
*/
public double getDouble(String key, double defaultValue) {
return getDouble(key, new Double(defaultValue)).doubleValue();
}
/**
* Get a double associated with the given configuration key.
*
* @param key The configuration key.
* @param defaultValue The default value.
* @return The associated double if key is found and has valid
* format, default value otherwise.
* @throws ClassCastException is thrown if the key maps to an
* object that is not a Double.
* @throws NumberFormatException is thrown if the value mapped
* by the key has not a valid number format.
*/
public Double getDouble(String key, Double defaultValue) {
Object value = get(key);
if (value instanceof Double) {
return (Double) value;
} else if (value instanceof String) {
Double d = new Double((String) value);
put(key, d);
return d;
} else if (value == null) {
if (defaults != null) {
return defaults.getDouble(key, defaultValue);
} else {
return defaultValue;
}
} else {
throw new ClassCastException('\'' + key + "' doesn't map to a Double object");
}
}
/**
* Convert a standard properties class into a configuration class.
* <p>
* NOTE: From Commons Collections 3.2 this method will pick up
* any default parent Properties of the specified input object.
*
* @param props the properties object to convert
* @return new ExtendedProperties created from props
*/
public static ExtendedProperties convertProperties(Properties props) {
ExtendedProperties c = new ExtendedProperties();
for (Enumeration e = props.propertyNames(); e.hasMoreElements();) {
String s = (String) e.nextElement();
c.setProperty(s, props.getProperty(s));
}
return c;
}
}
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