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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 org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Task;
import java.io.File;
import java.util.ArrayList;
/**
* A base class for the ant task that contains logic for handling dependency files
*/
public abstract class BaseTask extends Task {
private DependencyGraph mDependencies;
private String mPreviousBuildType;
private String mBuildType;
public void setPreviousBuildType(String previousBuildType) {
mPreviousBuildType = previousBuildType;
}
public void setBuildType(String buildType) {
mBuildType = buildType;
}
protected abstract String getExecTaskName();
@Override
public void execute() throws BuildException {
}
/**
* Set up the dependency graph by passing it the location of the ".d" file
* @param dependencyFile path to the dependency file to use
* @param watchPaths a list of folders to watch for new files
* @return true if the dependency graph was successfully initialized
*/
protected boolean initDependencies(String dependencyFile, ArrayList<File> watchPaths) {
if (mBuildType != null && mBuildType.equals(mPreviousBuildType) == false) {
// we don't care about deps, we need to execute the task no matter what.
return true;
}
File depFile = new File(dependencyFile);
if (depFile.exists()) {
mDependencies = new DependencyGraph(dependencyFile, watchPaths);
return true;
} else {
return false;
}
}
/**
* Wrapper check to see if we need to execute this task at all
* @return true if the DependencyGraph reports that our prereqs or targets
* have changed since the last run
*/
protected boolean dependenciesHaveChanged() {
if (mBuildType != null && mBuildType.equals(mPreviousBuildType) == false) {
String execName = getExecTaskName();
if (execName == null) {
System.out.println("Current build type is different than previous build: forced task run.");
} else {
System.out.println("Current build type is different than previous build: forced " + execName + " run.");
}
return true;
}
assert mDependencies != null : "Dependencies have not been initialized";
return mDependencies.dependenciesHaveChanged();
}
}
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