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/*******************************************************************************
* Copyright (c) 2013 protos software gmbh (http://www.protos.de).
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* CONTRIBUTORS:
* Henrik Rentz-Reichert (initial contribution)
*
*******************************************************************************/
package org.eclipse.etrice.generator.fsm.base;
import java.io.File;
import java.io.IOException;
import java.util.zip.CRC32;
import org.apache.commons.io.FileUtils;
import org.eclipse.etrice.core.genmodel.fsm.ILogger;
import org.eclipse.xtext.generator.JavaIoFileSystemAccess;
import org.eclipse.xtext.util.RuntimeIOException;
import com.google.inject.Inject;
/**
* @author Henrik Rentz-Reichert
*
*/
public class IncrementalGenerationFileIo implements IGeneratorFileIo {
@Inject JavaIoFileSystemAccess fileAccess;
@Inject ILogger logger;
private static boolean generateIncremental = false;
/**
* @return {@code true} if incremental generation is chosen
*/
public static boolean isGenerateIncremental() {
return generateIncremental;
}
/**
* @param generateIncremental select {@code true} if incremental generation is desired
*/
public static void setGenerateIncremental(boolean generateIncremental) {
IncrementalGenerationFileIo.generateIncremental = generateIncremental;
}
/**
* This method computes a hash key (a {@link java.util.zip.CRC32 CRC32} value) for the file contents
* and compares it to the
* one stored in the {@code infopath} directory with an added extension ".info". If the values are equal
* then the file stored in the {@code infopath} is copied to {@code path} while preserving the file data.
* In the other case the key is stored and the file is stored to {@code infopath} and {@code path}.
*/
@Override
public void generateFile(String desc, String path, String infopath, String file, CharSequence contents) {
long oldCRC = 0;
// use local copy to avoid inconsistencies due to concurrent change
boolean genInc = generateIncremental;
if (genInc) {
// read old CRC value
fileAccess.setOutputPath(infopath);
try {
CharSequence val = fileAccess.readTextFile(file+".info", JavaIoFileSystemAccess.DEFAULT_OUTPUT);
oldCRC = Long.parseLong(val.toString());
}
catch (RuntimeIOException e) {
}
catch (NumberFormatException e) {
}
}
boolean write = true;
long newCRC = 0;
if (genInc) {
CRC32 crc32 = new CRC32();
crc32.update(contents.toString().getBytes());
newCRC = crc32.getValue();
if (oldCRC==newCRC) {
write = false;
}
else {
fileAccess.generateFile(file+".info", ""+newCRC);
}
}
if (write) {
logger.logInfo(desc+" '"+file+"' in '"+path+"'");
fileAccess.setOutputPath(path);
fileAccess.generateFile(file, contents);
if (genInc) {
// save a copy in the info directory which is not cleared (and not compiled)
fileAccess.setOutputPath(infopath);
fileAccess.generateFile(file + ".incgen.txt", contents);
}
}
else {
logger.logInfo(desc+" (unchanged) '"+file+"' in '"+path+"'");
File src = new File(infopath+file + ".incgen.txt");
File dst = new File(path+file);
try {
FileUtils.copyFile(src, dst, true);
}
catch (IOException e) {
fileAccess.setOutputPath(path);
fileAccess.generateFile(file, contents);
}
}
}
}
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