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// Copyright 2014 Google Inc. All rights reserved.
//
// 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.google.devtools.build.buildjar;
import com.google.common.base.Preconditions;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* A processor to apply additional steps to the compiled java classes. It can be used to add code
* coverage instrumentation for instance.
*/
public abstract class AbstractPostProcessor {
private static final Map<String, AbstractPostProcessor> postProcessors = new HashMap<>();
/**
* Declares a post processor with a name. This name serves as the command line argument to
* reference a processor.
*
* @param name the command line name of the processor
* @param postProcessor the post processor object
*/
public static void addPostProcessor(String name, AbstractPostProcessor postProcessor) {
postProcessors.put(name, postProcessor);
}
private String workingDir = null;
private JavaLibraryBuildRequest build = null;
/**
* Sets the command line arguments for this processor.
*
* @param arguments the list of arguments
*
* @throws InvalidCommandLineException when the list of arguments for this processors is
* incorrect.
*/
public abstract void setCommandLineArguments(List<String> arguments)
throws InvalidCommandLineException;
/**
* This initializer is outside of the constructor so the arguments are not passed to the
* descendants.
*/
void initialize(JavaLibraryBuildRequest build) {
this.build = build;
}
protected String workingPath(String name) {
Preconditions.checkNotNull(this.build);
return workingDir != null && name.length() > 0 && name.charAt(0) != '/'
? workingDir + File.separator + name
: name;
}
protected boolean shouldCompressJar() {
return build.compressJar();
}
protected String getBuildClassDir() {
return build.getClassDir();
}
/**
* Main interface method of the post processor.
*/
public abstract void processRequest() throws IOException;
/**
* Create an {@link AbstractPostProcessor} using reflection.
*
* @param processorName the name of the processor to instantiate. It should exist in the list of
* post processors added with the {@link #addPostProcessor(String, AbstractPostProcessor)}
* method.
* @param arguments the list of arguments that should be passed to the processor during
* instantiation.
* @throws InvalidCommandLineException on error creating the processor
*/
static AbstractPostProcessor create(String processorName, List<String> arguments)
throws InvalidCommandLineException {
AbstractPostProcessor processor = postProcessors.get(processorName);
if (processor == null) {
throw new InvalidCommandLineException("No such processor '" + processorName + "'");
}
processor.setCommandLineArguments(arguments);
return processor;
}
/**
* Recursively delete the given file, it is unsafe.
*
* @param file the file to recursively remove
*/
protected static void recursiveRemove(File file) {
if (file.isDirectory()) {
for (File f : file.listFiles()) {
recursiveRemove(f);
}
} else if (file.exists()) {
file.delete();
}
}
}
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