| /* |
| * 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.common.xml; |
| |
| import com.android.common.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 com.android.common.xml.AndroidXPathFactory.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; |
| } |
| } |