/**
* Copyright 2010 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.selector;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.drools.CheckedDroolsException;
import org.drools.RuleBase;
import org.drools.RuntimeDroolsException;
import org.drools.StatelessSession;
import org.drools.StatelessSessionResult;
import org.drools.compiler.RuleBaseLoader;
import org.drools.repository.AssetItem;
/**
* This uses rules to decide if an asset is to be included in a build.
*
* @author Michael Neale
*
*/
public class RuleBasedSelector implements AssetSelector {
private static final Logger log = LoggerFactory.getLogger( RuleBasedSelector.class );
String ruleFile;
private RuleBase ruleBase;
public RuleBasedSelector(String val) {
this.ruleFile = val;
InputStream ins = this.getClass().getResourceAsStream( ruleFile );
InputStreamReader reader = new InputStreamReader(ins);
try {
this.ruleBase = RuleBaseLoader.getInstance().loadFromReader( reader );
} catch ( CheckedDroolsException e ) {
log.error( "Unable to load rule base.", e );
throw new RuntimeDroolsException(e);
} catch ( IOException e ) {
log.error( "Unable to load rule base.", e );
throw new RuntimeDroolsException(e);
}
}
public boolean isAssetAllowed(AssetItem asset) {
return evalRules( asset );
}
boolean evalRules(Object asset) {
StatelessSession session = ruleBase.newStatelessSession();
StatelessSessionResult result = session.executeWithResults( asset );
java.util.Iterator objects = result.iterateObjects();
while(objects.hasNext()) {
if (objects.next() instanceof Allow) {
return true;
}
}
return false;
}
}