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      1 /*
      2  * Copyright (C) 2009 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.ant;
     18 
     19 import com.android.sdklib.xml.AndroidXPathFactory;
     20 
     21 import org.apache.tools.ant.BuildException;
     22 import org.apache.tools.ant.Task;
     23 import org.apache.tools.ant.types.Path;
     24 import org.xml.sax.InputSource;
     25 
     26 import java.io.FileInputStream;
     27 import java.io.FileNotFoundException;
     28 
     29 import javax.xml.xpath.XPath;
     30 import javax.xml.xpath.XPathExpressionException;
     31 
     32 /**
     33  * Android specific XPath task.
     34  * The goal is to get the result of an XPath expression on Android XML files. The android namespace
     35  * (http://schemas.android.com/apk/res/android) must be associated to the "android" prefix.
     36  */
     37 public class XPathTask extends Task {
     38 
     39     private Path mManifestFile;
     40     private String mProperty;
     41     private String mExpression;
     42     private String mDefault;
     43 
     44     public void setInput(Path manifestFile) {
     45         mManifestFile = manifestFile;
     46     }
     47 
     48     public void setOutput(String property) {
     49         mProperty = property;
     50     }
     51 
     52     public void setExpression(String expression) {
     53         mExpression = expression;
     54     }
     55 
     56     public void setDefault(String defaultValue) {
     57         mDefault = defaultValue;
     58     }
     59 
     60     @Override
     61     public void execute() throws BuildException {
     62         try {
     63             if (mManifestFile == null || mManifestFile.list().length == 0) {
     64                 throw new BuildException("input attribute is missing!");
     65             }
     66 
     67             if (mProperty == null) {
     68                 throw new BuildException("output attribute is missing!");
     69             }
     70 
     71             if (mExpression == null) {
     72                 throw new BuildException("expression attribute is missing!");
     73             }
     74 
     75             XPath xpath = AndroidXPathFactory.newXPath();
     76 
     77             String file = mManifestFile.list()[0];
     78             String result = xpath.evaluate(mExpression, new InputSource(new FileInputStream(file)));
     79             if (result.length() == 0 && mDefault != null) {
     80                 result = mDefault;
     81             }
     82 
     83             getProject().setProperty(mProperty, result);
     84         } catch (XPathExpressionException e) {
     85             throw new BuildException(e);
     86         } catch (FileNotFoundException e) {
     87             throw new BuildException(e);
     88         }
     89     }
     90 }
     91