org.drools.runtime.pipeline.impl.DroolsJaxbHelperProviderImpl Maven / Gradle / Ivy
/*
* Copyright 2005 JBoss Inc
*
* 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 org.drools.runtime.pipeline.impl;
import java.io.ByteArrayOutputStream;
import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.Reader;
import java.io.StringReader;
import java.util.ArrayList;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import org.drools.KnowledgeBase;
import org.drools.builder.KnowledgeBuilder;
import org.drools.builder.help.DroolsJaxbHelperProvider;
import org.drools.builder.impl.KnowledgeBuilderImpl;
import org.drools.command.runtime.BatchExecutionCommandImpl;
import org.drools.command.runtime.GetGlobalCommand;
import org.drools.command.runtime.SetGlobalCommand;
import org.drools.command.runtime.process.AbortWorkItemCommand;
import org.drools.command.runtime.process.CompleteWorkItemCommand;
import org.drools.command.runtime.process.SignalEventCommand;
import org.drools.command.runtime.process.StartProcessCommand;
import org.drools.command.runtime.rule.FireAllRulesCommand;
import org.drools.command.runtime.rule.GetObjectsCommand;
import org.drools.command.runtime.rule.InsertElementsCommand;
import org.drools.command.runtime.rule.InsertObjectCommand;
import org.drools.command.runtime.rule.ModifyCommand;
import org.drools.command.runtime.rule.QueryCommand;
import org.drools.command.runtime.rule.RetractCommand;
import org.drools.command.runtime.rule.ModifyCommand.SetterImpl;
import org.drools.common.DefaultFactHandle;
import org.drools.common.InternalRuleBase;
import org.drools.compiler.PackageBuilder;
import org.drools.compiler.PackageRegistry;
import org.drools.impl.KnowledgeBaseImpl;
import org.drools.io.Resource;
import org.drools.lang.descr.PackageDescr;
import org.drools.rule.builder.dialect.java.JavaDialect;
import org.drools.runtime.impl.ExecutionResultImpl;
import org.drools.runtime.rule.impl.FlatQueryResults;
import org.drools.xml.jaxb.util.JaxbListWrapper;
import org.xml.sax.InputSource;
import org.xml.sax.SAXParseException;
import com.sun.codemodel.CodeWriter;
import com.sun.codemodel.JCodeModel;
import com.sun.codemodel.JPackage;
import com.sun.tools.xjc.BadCommandLineException;
import com.sun.tools.xjc.ErrorReceiver;
import com.sun.tools.xjc.ModelLoader;
import com.sun.tools.xjc.Options;
import com.sun.tools.xjc.model.Model;
public class DroolsJaxbHelperProviderImpl
implements
DroolsJaxbHelperProvider {
public static final String[] JAXB_ANNOTATED_CMD = {BatchExecutionCommandImpl.class.getName(),
SetGlobalCommand.class.getName(),
GetGlobalCommand.class.getName(),
FireAllRulesCommand.class.getName(),
InsertElementsCommand.class.getName(),
InsertObjectCommand.class.getName(),
ModifyCommand.class.getName(),
SetterImpl.class.getName(),
QueryCommand.class.getName(),
RetractCommand.class.getName(),
AbortWorkItemCommand.class.getName(),
SignalEventCommand.class.getName(),
StartProcessCommand.class.getName(),
BatchExecutionCommandImpl.class.getName(),
ExecutionResultImpl.class.getName() ,
DefaultFactHandle.class.getName(),
JaxbListWrapper.class.getName(),
FlatQueryResults.class.getName(),
CompleteWorkItemCommand.class.getName(),
GetObjectsCommand.class.getName()
};
public static String[] addXsdModel(Resource resource,
PackageBuilder pkgBuilder,
Options xjcOpts,
String systemId) throws IOException {
InputSource source = new InputSource( new CachingRewindableReader( resource.getReader() ) );
source.setSystemId( systemId.trim().startsWith( "." ) ? systemId : "." + systemId );
xjcOpts.addGrammar( source );
try {
xjcOpts.parseArguments( new String[]{"-npa"} );
} catch ( BadCommandLineException e ) {
throw new IllegalArgumentException( "Unable to parse arguments",
e );
}
ErrorReceiver errorReceiver = new JaxbErrorReceiver4Drools();
Model model = ModelLoader.load( xjcOpts,
new JCodeModel(),
errorReceiver );
model.generateCode( xjcOpts, errorReceiver );
MapVfsCodeWriter codeWriter = new MapVfsCodeWriter();
model.codeModel.build( xjcOpts.createCodeWriter( codeWriter ) );
List classNames = new ArrayList();
for ( Entry entry : codeWriter.getMap().entrySet() ) {
String name = entry.getKey();
//if (name.endsWith("ObjectFactory.java")) {
// continue;
//}
String pkgName = null;
int dotPos = name.lastIndexOf( '.' );
pkgName = name.substring( 0,
dotPos );
if ( !name.endsWith( "package-info.java" ) ) {
classNames.add( pkgName );
}
dotPos = pkgName.lastIndexOf( '.' );
if ( dotPos != -1 ) {
pkgName = pkgName.substring( 0,
dotPos );
}
PackageRegistry pkgReg = pkgBuilder.getPackageRegistry( pkgName );
if ( pkgReg == null ) {
pkgBuilder.addPackage( new PackageDescr( pkgName ) );
pkgReg = pkgBuilder.getPackageRegistry( pkgName );
}
JavaDialect dialect = (JavaDialect) pkgReg.getDialectCompiletimeRegistry().getDialect( "java" );
dialect.addSrc( convertToResource( entry.getKey() ),
entry.getValue() );
}
pkgBuilder.compileAll();
pkgBuilder.updateResults();
return classNames.toArray( new String[classNames.size()] );
}
public String[] addXsdModel(Resource resource,
KnowledgeBuilder kbuilder,
Options xjcOpts,
String systemId) throws IOException {
PackageBuilder pkgBuilder = ((KnowledgeBuilderImpl) kbuilder).pkgBuilder;
return addXsdModel( resource, pkgBuilder, xjcOpts, systemId );
}
public JAXBContext newJAXBContext(String[] classNames,
KnowledgeBase kbase) throws JAXBException {
return newJAXBContext( classNames,
Collections. emptyMap(),
kbase );
}
public JAXBContext newJAXBContext(String[] classNames,
Map properties,
KnowledgeBase kbase) throws JAXBException {
ClassLoader classLoader = ((InternalRuleBase) ((KnowledgeBaseImpl) kbase)
.getRuleBase()).getRootClassLoader();
int i = 0;
try {
Class[] classes = new Class[classNames.length
+ JAXB_ANNOTATED_CMD.length];
for (i = 0; i < classNames.length; i++) {
classes[i] = classLoader.loadClass(classNames[i]);
}
int j = 0;
for (i = classNames.length; i < classes.length; i++, j++) {
classes[i] = classLoader.loadClass(JAXB_ANNOTATED_CMD[j]);
}
return JAXBContext.newInstance(classes, properties);
} catch (ClassNotFoundException e) {
throw new JAXBException("Unable to resolve class '" + classNames[i] + "'", e);
}
}
private static String convertToResource(String string) {
int lastDot = string.lastIndexOf( '.' );
return string.substring( 0,
lastDot ).replace( '.',
'/' ) + string.substring( lastDot,
string.length() );
}
public static class MapVfsCodeWriter extends CodeWriter {
private final Map map;
private ByteArrayOutputStream currentBaos;
private String currentPath;
public MapVfsCodeWriter() {
this.map = new LinkedHashMap();
}
public OutputStream openBinary(JPackage pkg,
String fileName) throws IOException {
String pkgName = pkg.name();
if ( pkgName.length() != 0 ) {
pkgName += '.';
}
if ( this.currentBaos != null ) {
this.currentBaos.close();
this.map.put( this.currentPath,
this.currentBaos.toByteArray() );
}
this.currentPath = pkgName + fileName;
this.currentBaos = new ByteArrayOutputStream();
return new FilterOutputStream( this.currentBaos ) {
public void close() {
// don't let this stream close
}
};
}
public void close() throws IOException {
if ( this.currentBaos != null ) {
this.currentBaos.close();
this.map.put( this.currentPath,
this.currentBaos.toByteArray() );
}
}
public Map getMap() {
return this.map;
}
}
public static class JaxbErrorReceiver4Drools extends ErrorReceiver {
public String stage = "processing";
public void warning(SAXParseException e) {
e.printStackTrace();
}
public void error(SAXParseException e) {
e.printStackTrace();
}
public void fatalError(SAXParseException e) {
e.printStackTrace();
}
public void info(SAXParseException e) {
e.printStackTrace();
}
}
public static class CachingRewindableReader extends Reader {
private Reader source;
private boolean sourceClosed;
private RewindableStringReader cache;
private StringBuilder strBuilder;
public CachingRewindableReader(Reader source) {
this.source = source;
this.strBuilder = new StringBuilder();
}
public int read(char[] cbuf,
int off,
int len) throws IOException {
int value = 0;
if ( this.cache == null ) {
value = this.source.read( cbuf,
off,
len );
if ( value != -1 ) {
// keep appening to the stringBuilder until we are at the end
this.strBuilder.append( cbuf,
off,
value );
} else {
// we are at the end, so switch to cache
this.cache = new RewindableStringReader( strBuilder.toString() );
}
} else {
value = this.cache.read( cbuf,
off,
len );
}
return value;
}
public void close() throws IOException {
if ( !sourceClosed ) {
// close the source, we only do this once.
this.source.close();
this.sourceClosed = true;
}
if ( cache == null ) {
// switch to cache if we haven't already
this.cache = new RewindableStringReader( strBuilder.toString() );
} else {
// reset the cache, so it can be read again.
this.cache.reset();
}
}
}
public static class RewindableStringReader extends StringReader {
public RewindableStringReader(String s) {
super( s );
}
public void close() {
try {
reset();
} catch ( IOException e ) {
e.printStackTrace();
}
}
}
}
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