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/*
* Copyright (C) 2009 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.xml;
import com.android.SdkConstants;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import javax.xml.XMLConstants;
import javax.xml.namespace.NamespaceContext;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathFactory;
/**
* XPath factory with automatic support for the android name space.
*/
public class AndroidXPathFactory {
/** Default prefix for android name space: 'android' */
public final static String DEFAULT_NS_PREFIX = "android"; //$NON-NLS-1$
private final static XPathFactory sFactory = XPathFactory.newInstance();
/** Name space context for Android resource XML files. */
private static class AndroidNamespaceContext implements NamespaceContext {
private final static AndroidNamespaceContext sThis = new AndroidNamespaceContext(
DEFAULT_NS_PREFIX);
private final String mAndroidPrefix;
private final List<String> mAndroidPrefixes;
/**
* Returns the default {@link AndroidNamespaceContext}.
*/
private static AndroidNamespaceContext getDefault() {
return sThis;
}
/**
* Construct the context with the prefix associated with the android namespace.
* @param androidPrefix the Prefix
*/
public AndroidNamespaceContext(String androidPrefix) {
mAndroidPrefix = androidPrefix;
mAndroidPrefixes = Collections.singletonList(mAndroidPrefix);
}
@Override
public String getNamespaceURI(String prefix) {
if (prefix != null) {
if (prefix.equals(mAndroidPrefix)) {
return SdkConstants.NS_RESOURCES;
}
}
return XMLConstants.NULL_NS_URI;
}
@Override
public String getPrefix(String namespaceURI) {
if (SdkConstants.NS_RESOURCES.equals(namespaceURI)) {
return mAndroidPrefix;
}
return null;
}
@Override
public Iterator<?> getPrefixes(String namespaceURI) {
if (SdkConstants.NS_RESOURCES.equals(namespaceURI)) {
return mAndroidPrefixes.iterator();
}
return null;
}
}
/**
* Creates a new XPath object, specifying which prefix in the query is used for the
* android namespace.
* @param androidPrefix The namespace prefix.
*/
public static XPath newXPath(String androidPrefix) {
XPath xpath = sFactory.newXPath();
xpath.setNamespaceContext(new AndroidNamespaceContext(androidPrefix));
return xpath;
}
/**
* Creates a new XPath object using the default prefix for the android namespace.
* @see #DEFAULT_NS_PREFIX
*/
public static XPath newXPath() {
XPath xpath = sFactory.newXPath();
xpath.setNamespaceContext(AndroidNamespaceContext.getDefault());
return xpath;
}
}
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