/*
* Copyright (C) 2009 The Android Open Source Project
*
* Licensed under the Eclipse Public License, Version 1.0 (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.eclipse.org/org/documents/epl-v10.php
*
* 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.ide.eclipse.adt.internal.refactorings.extractstring;
import com.android.sdklib.xml.AndroidXPathFactory;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.CoreException;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;
import java.util.HashMap;
import java.util.Map;
import java.util.TreeMap;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpressionException;
/**
* An helper utility to get IDs out of an Android XML resource file.
*/
class XmlStringFileHelper {
/** A temporary cache of R.string IDs defined by a given xml file. The key is the
* project path of the file, the data is a set of known string Ids for that file.
*
* Map type: map [String filename] => map [String id => String value].
*/
private HashMap<String, Map<String, String>> mResIdCache =
new HashMap<String, Map<String, String>>();
/** An instance of XPath, created lazily on demand. */
private XPath mXPath;
public XmlStringFileHelper() {
}
/**
* Utility method used by the wizard to retrieve the actual value definition of a given
* string ID.
*
* @param project The project contain the XML file.
* @param xmlFileWsPath The project path of the XML file, e.g. "/res/values/strings.xml".
* The given file may or may not exist.
* @param stringId The string ID to find.
* @return The value string if the ID is defined, null otherwise.
*/
public String valueOfStringId(IProject project, String xmlFileWsPath, String stringId) {
Map<String, String> cache = getResIdsForFile(project, xmlFileWsPath);
return cache.get(stringId);
}
/**
* Utility method that retrieves all the *string* IDs defined in the given Android resource
* file. The instance maintains an internal cache so a given file is retrieved only once.
* Callers should consider the set to be read-only.
*
* @param project The project contain the XML file.
* @param xmlFileWsPath The project path of the XML file, e.g. "/res/values/strings.xml".
* The given file may or may not exist.
* @return The map of string IDs => values defined in the given file. Cached. Never null.
*/
public Map<String, String> getResIdsForFile(IProject project, String xmlFileWsPath) {
Map<String, String> cache = mResIdCache.get(xmlFileWsPath);
if (cache == null) {
cache = internalGetResIdsForFile(project, xmlFileWsPath);
mResIdCache.put(xmlFileWsPath, cache);
}
return cache;
}
/**
* Extract all the defined string IDs from a given file using XPath.
* @param project The project contain the XML file.
* @param xmlFileWsPath The project path of the file to parse. It may not exist.
* @return The map of all string IDs => values defined in the file.
* The returned set is always non null. It is empty if the file does not exist.
*/
private Map<String, String> internalGetResIdsForFile(IProject project, String xmlFileWsPath) {
TreeMap<String, String> ids = new TreeMap<String, String>();
if (mXPath == null) {
mXPath = AndroidXPathFactory.newXPath();
}
// Access the project that contains the resource that contains the compilation unit
IResource resource = project.getFile(xmlFileWsPath);
if (resource != null && resource.exists() && resource.getType() == IResource.FILE) {
InputSource source;
try {
source = new InputSource(((IFile) resource).getContents());
// We want all the IDs in an XML structure like this:
// <resources>
// <string name="ID">something</string>
// </resources>
String xpathExpr = "/resources/string"; //$NON-NLS-1$
Object result = mXPath.evaluate(xpathExpr, source, XPathConstants.NODESET);
if (result instanceof NodeList) {
NodeList list = (NodeList) result;
for (int n = list.getLength() - 1; n >= 0; n--) {
Node strNode = list.item(n);
NamedNodeMap attrs = strNode.getAttributes();
Node nameAttr = attrs.getNamedItem("name"); //$NON-NLS-1$
if (nameAttr != null) {
String id = nameAttr.getNodeValue();
String text = strNode.getTextContent();
ids.put(id, text);
}
}
}
} catch (CoreException e1) {
// IFile.getContents failed. Ignore.
} catch (XPathExpressionException e2) {
// mXPath.evaluate failed. Ignore.
}
}
return ids;
}
}