package org.drools.guvnor.server.contenthandler;
/*
* 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.
*/
import java.io.IOException;
import java.io.StringReader;
import java.util.Iterator;
import java.util.List;
import org.drools.compiler.DroolsParserException;
import org.drools.guvnor.client.rpc.RuleAsset;
import org.drools.guvnor.client.rpc.RuleContentText;
import org.drools.guvnor.server.builder.BRMSPackageBuilder;
import org.drools.guvnor.server.builder.ContentAssemblyError;
import org.drools.guvnor.server.builder.ContentPackageAssembler;
import org.drools.lang.ExpanderException;
import org.drools.lang.dsl.DefaultExpander;
import org.drools.repository.AssetItem;
import org.drools.repository.PackageItem;
import com.google.gwt.user.client.rpc.SerializableException;
public class DSLRuleContentHandler extends ContentHandler
implements
IRuleAsset {
public void retrieveAssetContent(RuleAsset asset,
PackageItem pkg,
AssetItem item) throws SerializableException {
RuleContentText text = new RuleContentText();
text.content = item.getContent();
asset.content = text;
}
public void storeAssetContent(RuleAsset asset,
AssetItem repoAsset) throws SerializableException {
RuleContentText text = (RuleContentText) asset.content;
repoAsset.updateContent( text.content );
}
public void compile(BRMSPackageBuilder builder,
AssetItem asset,
ContentPackageAssembler.ErrorLogger logger) throws DroolsParserException,
IOException {
DefaultExpander expander = getExpander( builder,
asset,
logger );
//add the rule keyword if its 'stand alone'
String source = asset.getContent();
if ( DRLFileContentHandler.isStandAloneRule( source ) ) {
String parentName = this.parentNameFromCategory( asset,
"" );
source = wrapRule( asset,
parentName,
source );
}
//expand and check for errors
String drl = expander.expand( source );
if ( expander.hasErrors() ) {
List exErrs = expander.getErrors();
for ( Iterator iter = exErrs.iterator(); iter.hasNext(); ) {
ExpanderException ex = (ExpanderException) iter.next();
logger.logError( new ContentAssemblyError( asset,
ex.getMessage() ) );
}
return;
}
builder.addPackageFromDrl( new StringReader( drl ) );
}
private DefaultExpander getExpander(BRMSPackageBuilder builder,
AssetItem asset,
ContentPackageAssembler.ErrorLogger logger) {
if ( !builder.hasDSL() ) {
logger.logError( new ContentAssemblyError( asset,
"This rule asset requires a DSL, yet none were configured in the package." ) );
}
return builder.getDSLExpander();
}
public void assembleDRL(BRMSPackageBuilder builder,
AssetItem asset,
StringBuffer buf) {
//add the rule keyword if its 'stand alone'
String source = getRawDRL( asset );
DefaultExpander expander = builder.getDSLExpander();
buf.append( expander.expand( source ) );
}
private String wrapRule(AssetItem asset,
String parentName,
String source) {
if ( parentName == null || "".equals( parentName ) ) {
return "rule '" + asset.getName() + "' \n" + source + "\nend";
} else {
return "rule '" + asset.getName() + "' extends " + parentName + " \n" + source + "\nend";
}
}
public String getRawDRL(AssetItem asset) {
String source = asset.getContent();
if ( DRLFileContentHandler.isStandAloneRule( source ) ) {
String parentName = this.parentNameFromCategory( asset,
"" );
source = wrapRule( asset,
parentName,
source );
}
return source;
}
}