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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.ant;
import com.android.sdklib.xml.AndroidXPathFactory;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Task;
import org.apache.tools.ant.types.Path;
import org.xml.sax.InputSource;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathExpressionException;
/**
* Android specific XPath task.
* The goal is to get the result of an XPath expression on Android XML files. The android namespace
* (http://schemas.android.com/apk/res/android) must be associated to the "android" prefix.
*/
public class XPathTask extends Task {
private Path mManifestFile;
private String mProperty;
private String mExpression;
private String mDefault;
public void setInput(Path manifestFile) {
mManifestFile = manifestFile;
}
public void setOutput(String property) {
mProperty = property;
}
public void setExpression(String expression) {
mExpression = expression;
}
public void setDefault(String defaultValue) {
mDefault = defaultValue;
}
@Override
public void execute() throws BuildException {
try {
if (mManifestFile == null || mManifestFile.list().length == 0) {
throw new BuildException("input attribute is missing!");
}
if (mProperty == null) {
throw new BuildException("output attribute is missing!");
}
if (mExpression == null) {
throw new BuildException("expression attribute is missing!");
}
XPath xpath = AndroidXPathFactory.newXPath();
String file = mManifestFile.list()[0];
String result = xpath.evaluate(mExpression, new InputSource(new FileInputStream(file)));
if (result.length() == 0 && mDefault != null) {
result = mDefault;
}
getProject().setProperty(mProperty, result);
} catch (XPathExpressionException e) {
throw new BuildException(e);
} catch (FileNotFoundException e) {
throw new BuildException(e);
}
}
}
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