org.hibernate.tool.enhance.EnhancementTask Maven / Gradle / Ivy
/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* License: GNU Lesser General Public License (LGPL), version 2.1 or later.
* See the lgpl.txt file in the root directory or .
*/
package org.hibernate.tool.enhance;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.hibernate.bytecode.enhance.spi.DefaultEnhancementContext;
import org.hibernate.bytecode.enhance.spi.Enhancer;
import org.hibernate.cfg.Environment;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.DirectoryScanner;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.Task;
import org.apache.tools.ant.types.FileSet;
/**
* Ant task for performing build-time enhancement of entities and component/embeddable classes.
*
* IMPL NOTE : currently makes numerous assumptions, the most "horrific" being that all entities are
* annotated @Entity which precludes {@code hbm.xml} mappings as well as complete {@code orm.xml} mappings. This is
* just a PoC though...
*
* @author Steve Ebersole
* @see org.hibernate.engine.spi.Managed
*/
public class EnhancementTask extends Task {
private List filesets = new ArrayList();
private final Enhancer enhancer = Environment.getBytecodeProvider().getEnhancer( new DefaultEnhancementContext() );
public void addFileset(FileSet set) {
this.filesets.add( set );
}
@Override
public void execute() throws BuildException {
log( "Starting Hibernate EnhancementTask execution", Project.MSG_INFO );
// we use the CtClass stuff here just as a simple vehicle for obtaining low level information about
// the class(es) contained in a file while still maintaining easy access to the underlying byte[]
final Project project = getProject();
for ( FileSet fileSet : filesets ) {
final File fileSetBaseDir = fileSet.getDir( project );
final DirectoryScanner directoryScanner = fileSet.getDirectoryScanner( project );
for ( String relativeIncludedFileName : directoryScanner.getIncludedFiles() ) {
final File javaClassFile = new File( fileSetBaseDir, relativeIncludedFileName );
if ( !javaClassFile.exists() ) {
continue;
}
processClassFile( relativeIncludedFileName, javaClassFile );
}
}
}
private void processClassFile(String relativeIncludedFileName, File javaClassFile) {
try {
String className = relativeIncludedFileName.substring( 0, ".class".length() ).replace( File.separatorChar, '.' );
ByteArrayOutputStream originalBytes = new ByteArrayOutputStream();
FileInputStream fileInputStream = new FileInputStream( javaClassFile );
try {
byte[] buffer = new byte[1024];
int length;
while ( ( length = fileInputStream.read( buffer ) ) != -1 ) {
originalBytes.write( buffer, 0, length );
}
}
finally {
fileInputStream.close();
}
byte[] result = enhancer.enhance( className, originalBytes.toByteArray() );
if ( result != null ) {
writeEnhancedClass( javaClassFile, result );
}
}
catch (Exception e) {
log( "Unable to enhance class file [" + javaClassFile.getAbsolutePath() + "]", e, Project.MSG_WARN );
}
}
private void writeEnhancedClass(File javaClassFile, byte[] result) {
try {
if ( javaClassFile.delete() ) {
if ( !javaClassFile.createNewFile() ) {
log( "Unable to recreate class file [" + javaClassFile.getName() + "]", Project.MSG_INFO );
}
}
else {
log( "Unable to delete class file [" + javaClassFile.getName() + "]", Project.MSG_INFO );
}
FileOutputStream outputStream = new FileOutputStream( javaClassFile, false );
try {
outputStream.write( result );
outputStream.flush();
}
finally {
try {
outputStream.close();
}
catch (IOException ignore) {
}
}
}
catch (FileNotFoundException ignore) {
// should not ever happen because of explicit checks
}
catch (IOException e) {
throw new BuildException(
String.format( "Error processing included file [%s]", javaClassFile.getAbsolutePath() ), e
);
}
}
}