Android example source code file (XmlUtils.java)
The XmlUtils.java Android example source code/*
* Copyright (C) 2006 The Android Open Source Project
*
* Licensed 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 com.android.internal.util;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import org.xmlpull.v1.XmlSerializer;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import android.util.Xml;
/** {@hide} */
public class XmlUtils
{
public static void skipCurrentTag(XmlPullParser parser)
throws XmlPullParserException, IOException {
int outerDepth = parser.getDepth();
int type;
while ((type=parser.next()) != XmlPullParser.END_DOCUMENT
&& (type != XmlPullParser.END_TAG
|| parser.getDepth() > outerDepth)) {
}
}
public static final int
convertValueToList(CharSequence value, String[] options, int defaultValue)
{
if (null != value) {
for (int i = 0; i < options.length; i++) {
if (value.equals(options[i]))
return i;
}
}
return defaultValue;
}
public static final boolean
convertValueToBoolean(CharSequence value, boolean defaultValue)
{
boolean result = false;
if (null == value)
return defaultValue;
if (value.equals("1")
|| value.equals("true")
|| value.equals("TRUE"))
result = true;
return result;
}
public static final int
convertValueToInt(CharSequence charSeq, int defaultValue)
{
if (null == charSeq)
return defaultValue;
String nm = charSeq.toString();
// XXX This code is copied from Integer.decode() so we don't
// have to instantiate an Integer!
int value;
int sign = 1;
int index = 0;
int len = nm.length();
int base = 10;
if ('-' == nm.charAt(0)) {
sign = -1;
index++;
}
if ('0' == nm.charAt(index)) {
// Quick check for a zero by itself
if (index == (len - 1))
return 0;
char c = nm.charAt(index + 1);
if ('x' == c || 'X' == c) {
index += 2;
base = 16;
} else {
index++;
base = 8;
}
}
else if ('#' == nm.charAt(index))
{
index++;
base = 16;
}
return Integer.parseInt(nm.substring(index), base) * sign;
}
public static final int
convertValueToUnsignedInt(String value, int defaultValue)
{
if (null == value)
return defaultValue;
return parseUnsignedIntAttribute(value);
}
public static final int
parseUnsignedIntAttribute(CharSequence charSeq)
{
String value = charSeq.toString();
long bits;
int index = 0;
int len = value.length();
int base = 10;
if ('0' == value.charAt(index)) {
// Quick check for zero by itself
if (index == (len - 1))
return 0;
char c = value.charAt(index + 1);
if ('x' == c || 'X' == c) { // check for hex
index += 2;
base = 16;
} else { // check for octal
index++;
base = 8;
}
} else if ('#' == value.charAt(index)) {
index++;
base = 16;
}
return (int) Long.parseLong(value.substring(index), base);
}
/**
* Flatten a Map into an output stream as XML. The map can later be
* read back with readMapXml().
*
* @param val The map to be flattened.
* @param out Where to write the XML data.
*
* @see #writeMapXml(Map, String, XmlSerializer)
* @see #writeListXml
* @see #writeValueXml
* @see #readMapXml
*/
public static final void writeMapXml(Map val, OutputStream out)
throws XmlPullParserException, java.io.IOException {
XmlSerializer serializer = new FastXmlSerializer();
serializer.setOutput(out, "utf-8");
serializer.startDocument(null, true);
serializer.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true);
writeMapXml(val, null, serializer);
serializer.endDocument();
}
/**
* Flatten a List into an output stream as XML. The list can later be
* read back with readListXml().
*
* @param val The list to be flattened.
* @param out Where to write the XML data.
*
* @see #writeListXml(List, String, XmlSerializer)
* @see #writeMapXml
* @see #writeValueXml
* @see #readListXml
*/
public static final void writeListXml(List val, OutputStream out)
throws XmlPullParserException, java.io.IOException
{
XmlSerializer serializer = Xml.newSerializer();
serializer.setOutput(out, "utf-8");
serializer.startDocument(null, true);
serializer.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true);
writeListXml(val, null, serializer);
serializer.endDocument();
}
/**
* Flatten a Map into an XmlSerializer. The map can later be read back
* with readThisMapXml().
*
* @param val The map to be flattened.
* @param name Name attribute to include with this list's tag, or null for
* none.
* @param out XmlSerializer to write the map into.
*
* @see #writeMapXml(Map, OutputStream)
* @see #writeListXml
* @see #writeValueXml
* @see #readMapXml
*/
public static final void writeMapXml(Map val, String name, XmlSerializer out)
throws XmlPullParserException, java.io.IOException
{
if (val == null) {
out.startTag(null, "null");
out.endTag(null, "null");
return;
}
Set s = val.entrySet();
Iterator i = s.iterator();
out.startTag(null, "map");
if (name != null) {
out.attribute(null, "name", name);
}
while (i.hasNext()) {
Map.Entry e = (Map.Entry)i.next();
writeValueXml(e.getValue(), (String)e.getKey(), out);
}
out.endTag(null, "map");
}
/**
* Flatten a List into an XmlSerializer. The list can later be read back
* with readThisListXml().
*
* @param val The list to be flattened.
* @param name Name attribute to include with this list's tag, or null for
* none.
* @param out XmlSerializer to write the list into.
*
* @see #writeListXml(List, OutputStream)
* @see #writeMapXml
* @see #writeValueXml
* @see #readListXml
*/
public static final void writeListXml(List val, String name, XmlSerializer out)
throws XmlPullParserException, java.io.IOException
{
if (val == null) {
out.startTag(null, "null");
out.endTag(null, "null");
return;
}
out.startTag(null, "list");
if (name != null) {
out.attribute(null, "name", name);
}
int N = val.size();
int i=0;
while (i < N) {
writeValueXml(val.get(i), null, out);
i++;
}
out.endTag(null, "list");
}
/**
* Flatten a byte[] into an XmlSerializer. The list can later be read back
* with readThisByteArrayXml().
*
* @param val The byte array to be flattened.
* @param name Name attribute to include with this array's tag, or null for
* none.
* @param out XmlSerializer to write the array into.
*
* @see #writeMapXml
* @see #writeValueXml
*/
public static final void writeByteArrayXml(byte[] val, String name,
XmlSerializer out)
throws XmlPullParserException, java.io.IOException {
if (val == null) {
out.startTag(null, "null");
out.endTag(null, "null");
return;
}
out.startTag(null, "byte-array");
if (name != null) {
out.attribute(null, "name", name);
}
final int N = val.length;
out.attribute(null, "num", Integer.toString(N));
StringBuilder sb = new StringBuilder(val.length*2);
for (int i=0; i<N; i++) {
int b = val[i];
int h = b>>4;
sb.append(h >= 10 ? ('a'+h-10) : ('0'+h));
h = b&0xff;
sb.append(h >= 10 ? ('a'+h-10) : ('0'+h));
}
out.text(sb.toString());
out.endTag(null, "byte-array");
}
/**
* Flatten an int[] into an XmlSerializer. The list can later be read back
* with readThisIntArrayXml().
*
* @param val The int array to be flattened.
* @param name Name attribute to include with this array's tag, or null for
* none.
* @param out XmlSerializer to write the array into.
*
* @see #writeMapXml
* @see #writeValueXml
* @see #readThisIntArrayXml
*/
public static final void writeIntArrayXml(int[] val, String name,
XmlSerializer out)
throws XmlPullParserException, java.io.IOException {
if (val == null) {
out.startTag(null, "null");
out.endTag(null, "null");
return;
}
out.startTag(null, "int-array");
if (name != null) {
out.attribute(null, "name", name);
}
final int N = val.length;
out.attribute(null, "num", Integer.toString(N));
for (int i=0; i<N; i++) {
out.startTag(null, "item");
out.attribute(null, "value", Integer.toString(val[i]));
out.endTag(null, "item");
}
out.endTag(null, "int-array");
}
/**
* Flatten an object's value into an XmlSerializer. The value can later
* be read back with readThisValueXml().
*
* Currently supported value types are: null, String, Integer, Long,
* Float, Double Boolean, Map, List.
*
* @param v The object to be flattened.
* @param name Name attribute to include with this value's tag, or null
* for none.
* @param out XmlSerializer to write the object into.
*
* @see #writeMapXml
* @see #writeListXml
* @see #readValueXml
*/
public static final void writeValueXml(Object v, String name, XmlSerializer out)
throws XmlPullParserException, java.io.IOException
{
String typeStr;
if (v == null) {
out.startTag(null, "null");
if (name != null) {
out.attribute(null, "name", name);
}
out.endTag(null, "null");
return;
} else if (v instanceof String) {
out.startTag(null, "string");
if (name != null) {
out.attribute(null, "name", name);
}
out.text(v.toString());
out.endTag(null, "string");
return;
} else if (v instanceof Integer) {
typeStr = "int";
} else if (v instanceof Long) {
typeStr = "long";
} else if (v instanceof Float) {
typeStr = "float";
} else if (v instanceof Double) {
typeStr = "double";
} else if (v instanceof Boolean) {
typeStr = "boolean";
} else if (v instanceof byte[]) {
writeByteArrayXml((byte[])v, name, out);
return;
} else if (v instanceof int[]) {
writeIntArrayXml((int[])v, name, out);
return;
} else if (v instanceof Map) {
writeMapXml((Map)v, name, out);
return;
} else if (v instanceof List) {
writeListXml((List)v, name, out);
return;
} else if (v instanceof CharSequence) {
// XXX This is to allow us to at least write something if
// we encounter styled text... but it means we will drop all
// of the styling information. :(
out.startTag(null, "string");
if (name != null) {
out.attribute(null, "name", name);
}
out.text(v.toString());
out.endTag(null, "string");
return;
} else {
throw new RuntimeException("writeValueXml: unable to write value " + v);
}
out.startTag(null, typeStr);
if (name != null) {
out.attribute(null, "name", name);
}
out.attribute(null, "value", v.toString());
out.endTag(null, typeStr);
}
/**
* Read a HashMap from an InputStream containing XML. The stream can
* previously have been written by writeMapXml().
*
* @param in The InputStream from which to read.
*
* @return HashMap The resulting map.
*
* @see #readListXml
* @see #readValueXml
* @see #readThisMapXml
* #see #writeMapXml
*/
public static final HashMap readMapXml(InputStream in)
throws XmlPullParserException, java.io.IOException
{
XmlPullParser parser = Xml.newPullParser();
parser.setInput(in, null);
return (HashMap)readValueXml(parser, new String[1]);
}
/**
* Read an ArrayList from an InputStream containing XML. The stream can
* previously have been written by writeListXml().
*
* @param in The InputStream from which to read.
*
* @return HashMap The resulting list.
*
* @see #readMapXml
* @see #readValueXml
* @see #readThisListXml
* @see #writeListXml
*/
public static final ArrayList readListXml(InputStream in)
throws XmlPullParserException, java.io.IOException
{
XmlPullParser parser = Xml.newPullParser();
parser.setInput(in, null);
return (ArrayList)readValueXml(parser, new String[1]);
}
/**
* Read a HashMap object from an XmlPullParser. The XML data could
* previously have been generated by writeMapXml(). The XmlPullParser
* must be positioned <em>after the tag that begins the map.
*
* @param parser The XmlPullParser from which to read the map data.
* @param endTag Name of the tag that will end the map, usually "map".
* @param name An array of one string, used to return the name attribute
* of the map's tag.
*
* @return HashMap The newly generated map.
*
* @see #readMapXml
*/
public static final HashMap readThisMapXml(XmlPullParser parser, String endTag, String[] name)
throws XmlPullParserException, java.io.IOException
{
HashMap map = new HashMap();
int eventType = parser.getEventType();
do {
if (eventType == parser.START_TAG) {
Object val = readThisValueXml(parser, name);
if (name[0] != null) {
//System.out.println("Adding to map: " + name + " -> " + val);
map.put(name[0], val);
} else {
throw new XmlPullParserException(
"Map value without name attribute: " + parser.getName());
}
} else if (eventType == parser.END_TAG) {
if (parser.getName().equals(endTag)) {
return map;
}
throw new XmlPullParserException(
"Expected " + endTag + " end tag at: " + parser.getName());
}
eventType = parser.next();
} while (eventType != parser.END_DOCUMENT);
throw new XmlPullParserException(
"Document ended before " + endTag + " end tag");
}
/**
* Read an ArrayList object from an XmlPullParser. The XML data could
* previously have been generated by writeListXml(). The XmlPullParser
* must be positioned <em>after the tag that begins the list.
*
* @param parser The XmlPullParser from which to read the list data.
* @param endTag Name of the tag that will end the list, usually "list".
* @param name An array of one string, used to return the name attribute
* of the list's tag.
*
* @return HashMap The newly generated list.
*
* @see #readListXml
*/
public static final ArrayList readThisListXml(XmlPullParser parser, String endTag, String[] name)
throws XmlPullParserException, java.io.IOException
{
ArrayList list = new ArrayList();
int eventType = parser.getEventType();
do {
if (eventType == parser.START_TAG) {
Object val = readThisValueXml(parser, name);
list.add(val);
//System.out.println("Adding to list: " + val);
} else if (eventType == parser.END_TAG) {
if (parser.getName().equals(endTag)) {
return list;
}
throw new XmlPullParserException(
"Expected " + endTag + " end tag at: " + parser.getName());
}
eventType = parser.next();
} while (eventType != parser.END_DOCUMENT);
throw new XmlPullParserException(
"Document ended before " + endTag + " end tag");
}
/**
* Read an int[] object from an XmlPullParser. The XML data could
* previously have been generated by writeIntArrayXml(). The XmlPullParser
* must be positioned <em>after the tag that begins the list.
*
* @param parser The XmlPullParser from which to read the list data.
* @param endTag Name of the tag that will end the list, usually "list".
* @param name An array of one string, used to return the name attribute
* of the list's tag.
*
* @return Returns a newly generated int[].
*
* @see #readListXml
*/
public static final int[] readThisIntArrayXml(XmlPullParser parser,
String endTag, String[] name)
throws XmlPullParserException, java.io.IOException {
int num;
try {
num = Integer.parseInt(parser.getAttributeValue(null, "num"));
} catch (NullPointerException e) {
throw new XmlPullParserException(
"Need num attribute in byte-array");
} catch (NumberFormatException e) {
throw new XmlPullParserException(
"Not a number in num attribute in byte-array");
}
int[] array = new int[num];
int i = 0;
int eventType = parser.getEventType();
do {
if (eventType == parser.START_TAG) {
if (parser.getName().equals("item")) {
try {
array[i] = Integer.parseInt(
parser.getAttributeValue(null, "value"));
} catch (NullPointerException e) {
throw new XmlPullParserException(
"Need value attribute in item");
} catch (NumberFormatException e) {
throw new XmlPullParserException(
"Not a number in value attribute in item");
}
} else {
throw new XmlPullParserException(
"Expected item tag at: " + parser.getName());
}
} else if (eventType == parser.END_TAG) {
if (parser.getName().equals(endTag)) {
return array;
} else if (parser.getName().equals("item")) {
i++;
} else {
throw new XmlPullParserException(
"Expected " + endTag + " end tag at: "
+ parser.getName());
}
}
eventType = parser.next();
} while (eventType != parser.END_DOCUMENT);
throw new XmlPullParserException(
"Document ended before " + endTag + " end tag");
}
/**
* Read a flattened object from an XmlPullParser. The XML data could
* previously have been written with writeMapXml(), writeListXml(), or
* writeValueXml(). The XmlPullParser must be positioned <em>at the
* tag that defines the value.
*
* @param parser The XmlPullParser from which to read the object.
* @param name An array of one string, used to return the name attribute
* of the value's tag.
*
* @return Object The newly generated value object.
*
* @see #readMapXml
* @see #readListXml
* @see #writeValueXml
*/
public static final Object readValueXml(XmlPullParser parser, String[] name)
throws XmlPullParserException, java.io.IOException
{
int eventType = parser.getEventType();
do {
if (eventType == parser.START_TAG) {
return readThisValueXml(parser, name);
} else if (eventType == parser.END_TAG) {
throw new XmlPullParserException(
"Unexpected end tag at: " + parser.getName());
} else if (eventType == parser.TEXT) {
throw new XmlPullParserException(
"Unexpected text: " + parser.getText());
}
eventType = parser.next();
} while (eventType != parser.END_DOCUMENT);
throw new XmlPullParserException(
"Unexpected end of document");
}
private static final Object readThisValueXml(XmlPullParser parser, String[] name)
throws XmlPullParserException, java.io.IOException
{
final String valueName = parser.getAttributeValue(null, "name");
final String tagName = parser.getName();
//System.out.println("Reading this value tag: " + tagName + ", name=" + valueName);
Object res;
if (tagName.equals("null")) {
res = null;
} else if (tagName.equals("string")) {
String value = "";
int eventType;
while ((eventType = parser.next()) != parser.END_DOCUMENT) {
if (eventType == parser.END_TAG) {
if (parser.getName().equals("string")) {
name[0] = valueName;
//System.out.println("Returning value for " + valueName + ": " + value);
return value;
}
throw new XmlPullParserException(
"Unexpected end tag in <string>: " + parser.getName());
} else if (eventType == parser.TEXT) {
value += parser.getText();
} else if (eventType == parser.START_TAG) {
throw new XmlPullParserException(
"Unexpected start tag in <string>: " + parser.getName());
}
}
throw new XmlPullParserException(
"Unexpected end of document in <string>");
} else if (tagName.equals("int")) {
res = Integer.parseInt(parser.getAttributeValue(null, "value"));
} else if (tagName.equals("long")) {
res = Long.valueOf(parser.getAttributeValue(null, "value"));
} else if (tagName.equals("float")) {
res = new Float(parser.getAttributeValue(null, "value"));
} else if (tagName.equals("double")) {
res = new Double(parser.getAttributeValue(null, "value"));
} else if (tagName.equals("boolean")) {
res = Boolean.valueOf(parser.getAttributeValue(null, "value"));
} else if (tagName.equals("int-array")) {
parser.next();
res = readThisIntArrayXml(parser, "int-array", name);
name[0] = valueName;
//System.out.println("Returning value for " + valueName + ": " + res);
return res;
} else if (tagName.equals("map")) {
parser.next();
res = readThisMapXml(parser, "map", name);
name[0] = valueName;
//System.out.println("Returning value for " + valueName + ": " + res);
return res;
} else if (tagName.equals("list")) {
parser.next();
res = readThisListXml(parser, "list", name);
name[0] = valueName;
//System.out.println("Returning value for " + valueName + ": " + res);
return res;
} else {
throw new XmlPullParserException(
"Unknown tag: " + tagName);
}
// Skip through to end tag.
int eventType;
while ((eventType = parser.next()) != parser.END_DOCUMENT) {
if (eventType == parser.END_TAG) {
if (parser.getName().equals(tagName)) {
name[0] = valueName;
//System.out.println("Returning value for " + valueName + ": " + res);
return res;
}
throw new XmlPullParserException(
"Unexpected end tag in <" + tagName + ">: " + parser.getName());
} else if (eventType == parser.TEXT) {
throw new XmlPullParserException(
"Unexpected text in <" + tagName + ">: " + parser.getName());
} else if (eventType == parser.START_TAG) {
throw new XmlPullParserException(
"Unexpected start tag in <" + tagName + ">: " + parser.getName());
}
}
throw new XmlPullParserException(
"Unexpected end of document in <" + tagName + ">");
}
public static final void beginDocument(XmlPullParser parser, String firstElementName) throws XmlPullParserException, IOException
{
int type;
while ((type=parser.next()) != parser.START_TAG
&& type != parser.END_DOCUMENT) {
;
}
if (type != parser.START_TAG) {
throw new XmlPullParserException("No start tag found");
}
if (!parser.getName().equals(firstElementName)) {
throw new XmlPullParserException("Unexpected start tag: found " + parser.getName() +
", expected " + firstElementName);
}
}
public static final void nextElement(XmlPullParser parser) throws XmlPullParserException, IOException
{
int type;
while ((type=parser.next()) != parser.START_TAG
&& type != parser.END_DOCUMENT) {
;
}
}
}
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