Ant example source code file (Concat.java)
The Concat.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.tools.ant.taskdefs;
import java.io.File;
import java.io.Reader;
import java.io.Writer;
import java.io.FileReader;
import java.io.InputStream;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.OutputStream;
import java.io.StringReader;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.util.Arrays;
import java.util.Vector;
import java.util.Iterator;
import org.apache.tools.ant.Task;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.ProjectComponent;
import org.apache.tools.ant.filters.util.ChainReaderHelper;
import org.apache.tools.ant.types.Path;
import org.apache.tools.ant.types.FileSet;
import org.apache.tools.ant.types.FileList;
import org.apache.tools.ant.types.FilterChain;
import org.apache.tools.ant.types.Resource;
import org.apache.tools.ant.types.ResourceCollection;
import org.apache.tools.ant.types.resources.Restrict;
import org.apache.tools.ant.types.resources.Resources;
import org.apache.tools.ant.types.resources.FileResource;
import org.apache.tools.ant.types.resources.StringResource;
import org.apache.tools.ant.types.resources.selectors.Not;
import org.apache.tools.ant.types.resources.selectors.Exists;
import org.apache.tools.ant.types.resources.selectors.ResourceSelector;
import org.apache.tools.ant.util.FileUtils;
import org.apache.tools.ant.util.ConcatResourceInputStream;
/**
* This class contains the 'concat' task, used to concatenate a series
* of files into a single stream. The destination of this stream may
* be the system console, or a file. The following is a sample
* invocation:
*
* <pre>
* <concat destfile="${build.dir}/index.xml"
* append="false">
*
* <fileset dir="${xml.root.dir}"
* includes="*.xml" />
*
* </concat>
* </pre>
*
*/
public class Concat extends Task {
// The size of buffers to be used
private static final int BUFFER_SIZE = 8192;
private static final FileUtils FILE_UTILS = FileUtils.getFileUtils();
private static final ResourceSelector EXISTS = new Exists();
private static final ResourceSelector NOT_EXISTS = new Not(EXISTS);
// Attributes.
/**
* The destination of the stream. If <code>null, the system
* console is used.
*/
private File destinationFile;
/**
* Whether or not the stream should be appended if the destination file
* exists.
* Defaults to <code>false.
*/
private boolean append;
/**
* Stores the input file encoding.
*/
private String encoding;
/** Stores the output file encoding. */
private String outputEncoding;
/** Stores the binary attribute */
private boolean binary;
// Child elements.
/**
* This buffer stores the text within the 'concat' element.
*/
private StringBuffer textBuffer;
/**
* Stores a collection of file sets and/or file lists, used to
* select multiple files for concatenation.
*/
private Resources rc;
/** for filtering the concatenated */
private Vector filterChains;
/** ignore dates on input files */
private boolean forceOverwrite = true;
/** String to place at the start of the concatented stream */
private TextElement footer;
/** String to place at the end of the concatented stream */
private TextElement header;
/** add missing line.separator to files **/
private boolean fixLastLine = false;
/** endofline for fixlast line */
private String eolString;
/** outputwriter */
private Writer outputWriter = null;
/**
* Construct a new Concat task.
*/
public Concat() {
reset();
}
/**
* Reset state to default.
*/
public void reset() {
append = false;
forceOverwrite = true;
destinationFile = null;
encoding = null;
outputEncoding = null;
fixLastLine = false;
filterChains = null;
footer = null;
header = null;
binary = false;
outputWriter = null;
textBuffer = null;
eolString = System.getProperty("line.separator");
rc = null;
}
// Attribute setters.
/**
* Sets the destination file, or uses the console if not specified.
* @param destinationFile the destination file
*/
public void setDestfile(File destinationFile) {
this.destinationFile = destinationFile;
}
/**
* Sets the behavior when the destination file exists. If set to
* <code>true the stream data will be appended to the
* existing file, otherwise the existing file will be
* overwritten. Defaults to <code>false.
* @param append if true append to the file.
*/
public void setAppend(boolean append) {
this.append = append;
}
/**
* Sets the character encoding
* @param encoding the encoding of the input stream and unless
* outputencoding is set, the outputstream.
*/
public void setEncoding(String encoding) {
this.encoding = encoding;
if (outputEncoding == null) {
outputEncoding = encoding;
}
}
/**
* Sets the character encoding for outputting
* @param outputEncoding the encoding for the output file
* @since Ant 1.6
*/
public void setOutputEncoding(String outputEncoding) {
this.outputEncoding = outputEncoding;
}
/**
* Force overwrite existing destination file
* @param force if true always overwrite, otherwise only overwrite
* if the output file is older any of the input files.
* @since Ant 1.6
*/
public void setForce(boolean force) {
this.forceOverwrite = force;
}
// Nested element creators.
/**
* Path of files to concatenate.
* @return the path used for concatenating
* @since Ant 1.6
*/
public Path createPath() {
Path path = new Path(getProject());
add(path);
return path;
}
/**
* Set of files to concatenate.
* @param set the set of files
*/
public void addFileset(FileSet set) {
add(set);
}
/**
* List of files to concatenate.
* @param list the list of files
*/
public void addFilelist(FileList list) {
add(list);
}
/**
* Add an arbitrary ResourceCollection.
* @param c the ResourceCollection to add.
* @since Ant 1.7
*/
public void add(ResourceCollection c) {
rc = rc == null ? new Resources() : rc;
rc.add(c);
}
/**
* Adds a FilterChain.
* @param filterChain a filterchain to filter the concatenated input
* @since Ant 1.6
*/
public void addFilterChain(FilterChain filterChain) {
if (filterChains == null) {
filterChains = new Vector();
}
filterChains.addElement(filterChain);
}
/**
* This method adds text which appears in the 'concat' element.
* @param text the text to be concated.
*/
public void addText(String text) {
if (textBuffer == null) {
// Initialize to the size of the first text fragment, with
// the hopes that it's the only one.
textBuffer = new StringBuffer(text.length());
}
// Append the fragment -- we defer property replacement until
// later just in case we get a partial property in a fragment.
textBuffer.append(text);
}
/**
* Add a header to the concatenated output
* @param headerToAdd the header
* @since Ant 1.6
*/
public void addHeader(TextElement headerToAdd) {
this.header = headerToAdd;
}
/**
* Add a footer to the concatenated output
* @param footerToAdd the footer
* @since Ant 1.6
*/
public void addFooter(TextElement footerToAdd) {
this.footer = footerToAdd;
}
/**
* Append line.separator to files that do not end
* with a line.separator, default false.
* @param fixLastLine if true make sure each input file has
* new line on the concatenated stream
* @since Ant 1.6
*/
public void setFixLastLine(boolean fixLastLine) {
this.fixLastLine = fixLastLine;
}
/**
* Specify the end of line to find and to add if
* not present at end of each input file. This attribute
* is used in conjunction with fixlastline.
* @param crlf the type of new line to add -
* cr, mac, lf, unix, crlf, or dos
* @since Ant 1.6
*/
public void setEol(FixCRLF.CrLf crlf) {
String s = crlf.getValue();
if (s.equals("cr") || s.equals("mac")) {
eolString = "\r";
} else if (s.equals("lf") || s.equals("unix")) {
eolString = "\n";
} else if (s.equals("crlf") || s.equals("dos")) {
eolString = "\r\n";
}
}
/**
* Set the output writer. This is to allow
* concat to be used as a nested element.
* @param outputWriter the output writer.
* @since Ant 1.6
*/
public void setWriter(Writer outputWriter) {
this.outputWriter = outputWriter;
}
/**
* Set the binary attribute. If true, concat will concatenate the files
* byte for byte. This mode does not allow any filtering or other
* modifications to the input streams. The default value is false.
* @since Ant 1.6.2
* @param binary if true, enable binary mode.
*/
public void setBinary(boolean binary) {
this.binary = binary;
}
/**
* Validate configuration options.
*/
private ResourceCollection validate() {
// treat empty nested text as no text
sanitizeText();
// if binary check if incompatible attributes are used
if (binary) {
if (destinationFile == null) {
throw new BuildException(
"destfile attribute is required for binary concatenation");
}
if (textBuffer != null) {
throw new BuildException(
"Nested text is incompatible with binary concatenation");
}
if (encoding != null || outputEncoding != null) {
throw new BuildException(
"Seting input or output encoding is incompatible with binary"
+ " concatenation");
}
if (filterChains != null) {
throw new BuildException(
"Setting filters is incompatible with binary concatenation");
}
if (fixLastLine) {
throw new BuildException(
"Setting fixlastline is incompatible with binary concatenation");
}
if (header != null || footer != null) {
throw new BuildException(
"Nested header or footer is incompatible with binary concatenation");
}
}
if (destinationFile != null && outputWriter != null) {
throw new BuildException(
"Cannot specify both a destination file and an output writer");
}
// Sanity check our inputs.
if (rc == null && textBuffer == null) {
// Nothing to concatenate!
throw new BuildException(
"At least one resource must be provided, or some text.");
}
if (rc != null) {
// If using resources, disallow inline text. This is similar to
// using GNU 'cat' with file arguments -- stdin is simply
// ignored.
if (textBuffer != null) {
throw new BuildException(
"Cannot include inline text when using resources.");
}
Restrict noexistRc = new Restrict();
noexistRc.add(NOT_EXISTS);
noexistRc.add(rc);
for (Iterator i = noexistRc.iterator(); i.hasNext();) {
log(i.next() + " does not exist.", Project.MSG_ERR);
}
if (destinationFile != null) {
for (Iterator i = rc.iterator(); i.hasNext();) {
Object o = i.next();
if (o instanceof FileResource) {
File f = ((FileResource) o).getFile();
if (FILE_UTILS.fileNameEquals(f, destinationFile)) {
throw new BuildException("Input file \""
+ f + "\" is the same as the output file.");
}
}
}
}
Restrict existRc = new Restrict();
existRc.add(EXISTS);
existRc.add(rc);
boolean outofdate = destinationFile == null || forceOverwrite;
if (!outofdate) {
for (Iterator i = existRc.iterator(); !outofdate && i.hasNext();) {
Resource r = (Resource) i.next();
outofdate =
(r.getLastModified() == 0L
|| r.getLastModified() > destinationFile.lastModified());
}
}
if (!outofdate) {
log(destinationFile + " is up-to-date.", Project.MSG_VERBOSE);
return null; // no need to do anything
}
return existRc;
} else {
StringResource s = new StringResource();
s.setProject(getProject());
s.setValue(textBuffer.toString());
return s;
}
}
/**
* Execute the concat task.
*/
public void execute() {
ResourceCollection c = validate();
if (c == null) {
return;
}
// Do nothing if no resources (including nested text)
if (c.size() < 1 && header == null && footer == null) {
log("No existing resources and no nested text, doing nothing",
Project.MSG_INFO);
return;
}
if (binary) {
binaryCat(c);
} else {
cat(c);
}
}
/** perform the binary concatenation */
private void binaryCat(ResourceCollection c) {
log("Binary concatenation of " + c.size()
+ " resources to " + destinationFile);
FileOutputStream out = null;
InputStream in = null;
try {
try {
out = new FileOutputStream(destinationFile);
} catch (Exception t) {
throw new BuildException("Unable to open "
+ destinationFile + " for writing", t);
}
in = new ConcatResourceInputStream(c);
((ConcatResourceInputStream) in).setManagingComponent(this);
Thread t = new Thread(new StreamPumper(in, out));
t.start();
try {
t.join();
} catch (InterruptedException e) {
try {
t.join();
} catch (InterruptedException ee) {
// Empty
}
}
} finally {
FileUtils.close(in);
if (out != null) {
try {
out.close();
} catch (Exception ex) {
throw new BuildException(
"Unable to close " + destinationFile, ex);
}
}
}
}
/** perform the concatenation */
private void cat(ResourceCollection c) {
OutputStream os = null;
char[] buffer = new char[BUFFER_SIZE];
try {
PrintWriter writer = null;
if (outputWriter != null) {
writer = new PrintWriter(outputWriter);
} else {
if (destinationFile == null) {
// Log using WARN so it displays in 'quiet' mode.
os = new LogOutputStream(this, Project.MSG_WARN);
} else {
// ensure that the parent dir of dest file exists
File parent = destinationFile.getParentFile();
if (!parent.exists()) {
parent.mkdirs();
}
os = new FileOutputStream(destinationFile.getAbsolutePath(),
append);
}
if (outputEncoding == null) {
writer = new PrintWriter(
new BufferedWriter(
new OutputStreamWriter(os)));
} else {
writer = new PrintWriter(
new BufferedWriter(
new OutputStreamWriter(os, outputEncoding)));
}
}
if (header != null) {
if (header.getFiltering()) {
concatenate(
buffer, writer, new StringReader(header.getValue()));
} else {
writer.print(header.getValue());
}
}
if (c.size() > 0) {
concatenate(buffer, writer, new MultiReader(c));
}
if (footer != null) {
if (footer.getFiltering()) {
concatenate(
buffer, writer, new StringReader(footer.getValue()));
} else {
writer.print(footer.getValue());
}
}
writer.flush();
if (os != null) {
os.flush();
}
} catch (IOException ioex) {
throw new BuildException("Error while concatenating: "
+ ioex.getMessage(), ioex);
} finally {
FileUtils.close(os);
}
}
/** Concatenate a single reader to the writer using buffer */
private void concatenate(char[] buffer, Writer writer, Reader in)
throws IOException {
if (filterChains != null) {
ChainReaderHelper helper = new ChainReaderHelper();
helper.setBufferSize(BUFFER_SIZE);
helper.setPrimaryReader(in);
helper.setFilterChains(filterChains);
helper.setProject(getProject());
in = new BufferedReader(helper.getAssembledReader());
}
while (true) {
int nRead = in.read(buffer, 0, buffer.length);
if (nRead == -1) {
break;
}
writer.write(buffer, 0, nRead);
}
writer.flush();
}
/**
* Treat empty nested text as no text.
*
* <p>Depending on the XML parser, addText may have been called
* for "ignorable whitespace" as well.</p>
*/
private void sanitizeText() {
if (textBuffer != null) {
if (textBuffer.substring(0).trim().length() == 0) {
textBuffer = null;
}
}
}
/**
* sub element points to a file or contains text
*/
public static class TextElement extends ProjectComponent {
private String value = "";
private boolean trimLeading = false;
private boolean trim = false;
private boolean filtering = true;
private String encoding = null;
/**
* whether to filter the text in this element
* or not.
*
* @param filtering true if the text should be filtered.
* the default value is true.
*/
public void setFiltering(boolean filtering) {
this.filtering = filtering;
}
/** return the filtering attribute */
private boolean getFiltering() {
return filtering;
}
/**
* The encoding of the text element
*
* @param encoding the name of the charset used to encode
*/
public void setEncoding(String encoding) {
this.encoding = encoding;
}
/**
* set the text using a file
* @param file the file to use
* @throws BuildException if the file does not exist, or cannot be
* read
*/
public void setFile(File file) throws BuildException {
// non-existing files are not allowed
if (!file.exists()) {
throw new BuildException("File " + file + " does not exist.");
}
BufferedReader reader = null;
try {
if (this.encoding == null) {
reader = new BufferedReader(new FileReader(file));
} else {
reader = new BufferedReader(
new InputStreamReader(new FileInputStream(file),
this.encoding));
}
value = FileUtils.readFully(reader);
} catch (IOException ex) {
throw new BuildException(ex);
} finally {
FileUtils.close(reader);
}
}
/**
* set the text using inline
* @param value the text to place inline
*/
public void addText(String value) {
this.value += getProject().replaceProperties(value);
}
/**
* s:^\s*:: on each line of input
* @param strip if true do the trim
*/
public void setTrimLeading(boolean strip) {
this.trimLeading = strip;
}
/**
* whether to call text.trim()
* @param trim if true trim the text
*/
public void setTrim(boolean trim) {
this.trim = trim;
}
/**
* @return the text, after possible trimming
*/
public String getValue() {
if (value == null) {
value = "";
}
if (value.trim().length() == 0) {
value = "";
}
if (trimLeading) {
char[] current = value.toCharArray();
StringBuffer b = new StringBuffer(current.length);
boolean startOfLine = true;
int pos = 0;
while (pos < current.length) {
char ch = current[pos++];
if (startOfLine) {
if (ch == ' ' || ch == '\t') {
continue;
}
startOfLine = false;
}
b.append(ch);
if (ch == '\n' || ch == '\r') {
startOfLine = true;
}
}
value = b.toString();
}
if (trim) {
value = value.trim();
}
return value;
}
}
/**
* This class reads from each of the source files in turn.
* The concatentated result can then be filtered as
* a single stream.
*/
private class MultiReader extends Reader {
private Reader reader = null;
private int lastPos = 0;
private char[] lastChars = new char[eolString.length()];
private boolean needAddSeparator = false;
private Iterator i;
private MultiReader(ResourceCollection c) {
i = c.iterator();
}
private Reader getReader() throws IOException {
if (reader == null && i.hasNext()) {
Resource r = (Resource) i.next();
log("Concating " + r.toLongString(), Project.MSG_VERBOSE);
InputStream is = r.getInputStream();
reader = new BufferedReader(encoding == null
? new InputStreamReader(is)
: new InputStreamReader(is, encoding));
Arrays.fill(lastChars, (char) 0);
}
return reader;
}
private void nextReader() throws IOException {
close();
reader = null;
}
/**
* Read a character from the current reader object. Advance
* to the next if the reader is finished.
* @return the character read, -1 for EOF on the last reader.
* @exception IOException - possibly thrown by the read for a reader
* object.
*/
public int read() throws IOException {
if (needAddSeparator) {
int ret = eolString.charAt(lastPos++);
if (lastPos >= eolString.length()) {
lastPos = 0;
needAddSeparator = false;
}
return ret;
}
while (getReader() != null) {
int ch = getReader().read();
if (ch == -1) {
nextReader();
if (fixLastLine && isMissingEndOfLine()) {
needAddSeparator = true;
lastPos = 0;
}
} else {
addLastChar((char) ch);
return ch;
}
}
return -1;
}
/**
* Read into the buffer <code>cbuf.
* @param cbuf The array to be read into.
* @param off The offset.
* @param len The length to read.
* @exception IOException - possibly thrown by the reads to the
* reader objects.
*/
public int read(char[] cbuf, int off, int len)
throws IOException {
int amountRead = 0;
while (getReader() != null || needAddSeparator) {
if (needAddSeparator) {
cbuf[off] = eolString.charAt(lastPos++);
if (lastPos >= eolString.length()) {
lastPos = 0;
needAddSeparator = false;
}
len--;
off++;
amountRead++;
if (len == 0) {
return amountRead;
}
continue;
}
int nRead = getReader().read(cbuf, off, len);
if (nRead == -1 || nRead == 0) {
nextReader();
if (fixLastLine && isMissingEndOfLine()) {
needAddSeparator = true;
lastPos = 0;
}
} else {
if (fixLastLine) {
for (int i = nRead;
i > (nRead - lastChars.length);
--i) {
if (i <= 0) {
break;
}
addLastChar(cbuf[off + i - 1]);
}
}
len -= nRead;
off += nRead;
amountRead += nRead;
if (len == 0) {
return amountRead;
}
}
}
if (amountRead == 0) {
return -1;
} else {
return amountRead;
}
}
/**
* Close the current reader
*/
public void close() throws IOException {
if (reader != null) {
reader.close();
}
}
/**
* if checking for end of line at end of file
* add a character to the lastchars buffer
*/
private void addLastChar(char ch) {
for (int i = lastChars.length - 2; i >= 0; --i) {
lastChars[i] = lastChars[i + 1];
}
lastChars[lastChars.length - 1] = ch;
}
/**
* return true if the lastchars buffer does
* not contain the lineseparator
*/
private boolean isMissingEndOfLine() {
for (int i = 0; i < lastChars.length; ++i) {
if (lastChars[i] != eolString.charAt(i)) {
return true;
}
}
return false;
}
}
}
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