/*
* 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.guvnor.server.contenthandler;
import com.google.gwt.user.client.rpc.SerializationException;
import org.drools.compiler.DroolsParserException;
import org.drools.compiler.PackageBuilderConfiguration;
import org.drools.guvnor.client.rpc.RuleAsset;
import org.drools.guvnor.client.rpc.RuleFlowContentModel;
import org.drools.guvnor.server.builder.AssemblyErrorLogger;
import org.drools.guvnor.server.builder.BRMSPackageBuilder;
import org.drools.guvnor.server.builder.RuleFlowContentModelBuilder;
import org.drools.guvnor.server.builder.RuleFlowProcessBuilder;
import org.drools.repository.AssetItem;
import org.jbpm.compiler.xml.XmlProcessReader;
import org.jbpm.compiler.xml.XmlRuleFlowProcessDumper;
import org.jbpm.ruleflow.core.RuleFlowProcess;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
public class RuleFlowHandler extends ContentHandler
implements
ICompilable,
ICanHasAttachment {
public void retrieveAssetContent(RuleAsset asset,
AssetItem item) throws SerializationException {
RuleFlowProcess process = readProcess( new ByteArrayInputStream( item.getContent().getBytes() ) );
if ( process != null ) {
RuleFlowContentModel content = RuleFlowContentModelBuilder.createModel( process );
content.setXml( item.getContent() );
asset.setContent( content );
} else if ( process == null && !"".equals( item.getContent() ) ) {
asset.setContent( new RuleFlowContentModel() );
//
//
// Migrate v4 ruleflows to v5
// All we can do is put the old drools 4 rfm back as the xml so
// that we can at least rebuild the package with it if the
// migrate ruleflow system property is set true.
//
((RuleFlowContentModel) asset.getContent()).setXml( item.getContent() );
}
}
protected RuleFlowProcess readProcess(InputStream is) {
RuleFlowProcess process = null;
try {
InputStreamReader reader = new InputStreamReader( is );
PackageBuilderConfiguration configuration = new PackageBuilderConfiguration();
XmlProcessReader xmlReader = new XmlProcessReader( configuration.getSemanticModules(),
getClassLoader() );
try {
process = (RuleFlowProcess) xmlReader.read( reader );
} catch ( Exception e ) {
reader.close();
throw new Exception( "Unable to read rule flow XML." );
}
reader.close();
} catch ( Exception e ) {
return null;
}
return process;
}
public void storeAssetContent(RuleAsset asset,
AssetItem repoAsset) throws SerializationException {
RuleFlowContentModel content = (RuleFlowContentModel) asset.getContent();
//
// Migrate v4 ruleflows to v5
// Added guards to check for nulls in the case where the ruleflows
// have not been migrated from drools 4 to 5.
//
if ( content != null ) {
if ( content.getXml() != null ) {
RuleFlowProcess process = readProcess( new ByteArrayInputStream( content.getXml().getBytes() ) );
if ( process != null ) {
RuleFlowProcessBuilder.updateProcess( process,
content.getNodes() );
XmlRuleFlowProcessDumper dumper = XmlRuleFlowProcessDumper.INSTANCE;
String out = dumper.dump( process );
repoAsset.updateContent( out );
} else {
//
// Migrate v4 ruleflows to v5
// Put the old contents back as there is no updating possible
//
repoAsset.updateContent( content.getXml() );
}
}
}
}
/**
* The rule flow can not be built if the package name is not the same as the
* package that it exists in. This changes the package name.
*
* @param item
*/
public void onAttachmentAdded(AssetItem item) {
String content = item.getContent();
if ( content != null && !content.equals( "" ) ) {
RuleFlowProcess process = readProcess( new ByteArrayInputStream( content.getBytes() ) );
if ( process != null ) {
String packageName = item.getPackageName();
String originalPackageName = process.getPackageName();
if ( !packageName.equals( originalPackageName ) ) {
process.setPackageName( packageName );
XmlRuleFlowProcessDumper dumper = XmlRuleFlowProcessDumper.INSTANCE;
String out = dumper.dump( process );
item.updateContent( out );
item.checkin( "Changed rule flow package from " + originalPackageName + " to " + packageName );
}
}
}
}
public void onAttachmentRemoved(AssetItem item) throws IOException {
// Nothing to do when this asset type is removed.
}
public void compile(BRMSPackageBuilder builder,
AssetItem asset,
AssemblyErrorLogger logger) throws DroolsParserException,
IOException {
InputStream ins = asset.getBinaryContentAttachment();
if ( ins != null ) {
builder.addRuleFlow( new InputStreamReader( asset.getBinaryContentAttachment() ) );
}
}
private static ClassLoader getClassLoader() {
ClassLoader cl = Thread.currentThread().getContextClassLoader();
if ( cl == null ) {
cl = RuleFlowHandler.class.getClassLoader();
}
return cl;
}
}