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// Copyright 2007 The Android Open Source Project
package com.google.wireless.gdata2.data;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import org.xmlpull.v1.XmlSerializer;
import java.io.IOException;
/**
* Utility class for working with an XmlPullParser.
*/
public final class XmlUtils {
// utility class
private XmlUtils() {
}
/**
* Extracts the child text for the current element in the pull parser.
* @param parser The XmlPullParser parsing an XML document.
* @return The child text for the current element. May be null, if there
* is no child text.
* @throws XmlPullParserException Thrown if the child text could not be
* parsed.
* @throws IOException Thrown if the InputStream behind the parser cannot
* be read.
*/
public static String extractChildText(XmlPullParser parser)
throws XmlPullParserException, IOException {
// TODO: check that the current node is an element?
int eventType = parser.next();
if (eventType != XmlPullParser.TEXT) {
return null;
}
return parser.getText();
}
/**
* Extracts the child text for the first child element in the pull parser.
* Other child elements will be discarded
* @param parser The XmlPullParser parsing an XML document.
* @return The child text for the first child element. May be null, if there
* is no child text.
* @throws XmlPullParserException Thrown if the child text could not be
* parsed.
* @throws IOException Thrown if the InputStream behind the parser cannot
* be read.
*/
public static String extractFirstChildTextIgnoreRest(XmlPullParser parser)
throws XmlPullParserException, IOException {
int parentDepth = parser.getDepth();
int eventType = parser.next();
String child = null;
while (eventType != XmlPullParser.END_DOCUMENT) {
int depth = parser.getDepth();
if (eventType == XmlPullParser.TEXT) {
if (child == null) {
child = parser.getText();
}
} else if (eventType == XmlPullParser.END_TAG && depth == parentDepth) {
return child;
}
eventType = parser.next();
}
throw new XmlPullParserException("End of document reached; never saw expected end tag at "
+ "depth " + parentDepth);
}
/**
* Returns the nextDirectChildTag
* @param parser The XmlPullParser parsing an XML document.
* @param parentDepth the depth in the hierachy of the parent node
* @return The child element
* @throws XmlPullParserException Thrown if the child text could not be
* parsed.
* @throws IOException Thrown if the InputStream behind the parser cannot
* be read.
*/
public static String nextDirectChildTag(XmlPullParser parser, int parentDepth)
throws XmlPullParserException, IOException {
int targetDepth = parentDepth + 1;
int eventType = parser.next();
while (eventType != XmlPullParser.END_DOCUMENT) {
int depth = parser.getDepth();
if (eventType == XmlPullParser.START_TAG && depth == targetDepth) {
return parser.getName();
}
if (eventType == XmlPullParser.END_TAG && depth == parentDepth) {
return null;
}
eventType = parser.next();
}
throw new XmlPullParserException("End of document reached; never saw expected end tag at "
+ "depth " + parentDepth);
}
}
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