/*
* 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.command.runtime.rule;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.adapters.XmlAdapter;
import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;
import org.drools.command.impl.GenericCommand;
import org.drools.command.impl.KnowledgeCommandContext;
import org.drools.common.DisconnectedFactHandle;
import org.kie.command.Context;
import org.kie.command.Setter;
import org.kie.runtime.StatefulKnowledgeSession;
import org.kie.runtime.rule.FactHandle;
import org.kie.runtime.rule.SessionEntryPoint;
import org.mvel2.MVEL;
@XmlAccessorType(XmlAccessType.NONE)
public class ModifyCommand
implements
GenericCommand<Object> {
/**
* if this is true, modify can be any MVEL expressions. If false, it will only allow literal values.
* (false should be use when taking input from an untrusted source, such as a web service).
*/
public static boolean ALLOW_MODIFY_EXPRESSIONS = true;
private DisconnectedFactHandle handle;
@XmlJavaTypeAdapter(JaxbSetterAdapter.class)
@XmlElement
private List<Setter> setters;
public ModifyCommand() {
}
public ModifyCommand(FactHandle handle,
List<Setter> setters) {
this.handle = DisconnectedFactHandle.newFrom( handle );
this.setters = setters;
}
public Object execute(Context context) {
StatefulKnowledgeSession ksession = ((KnowledgeCommandContext) context).getStatefulKnowledgesession();
SessionEntryPoint wmep = ksession.getEntryPoint( handle.getEntryPointId() );
Object object = wmep.getObject( this.handle );
MVEL.eval( getMvelExpr(),
object );
wmep.update( handle,
object );
return object;
}
public FactHandle getFactHandle() {
return this.handle;
}
@XmlAttribute(name="fact-handle", required=true)
public void setFactHandleFromString(String factHandleId) {
handle = new DisconnectedFactHandle(factHandleId);
}
public String getFactHandleFromString() {
return handle.toExternalForm();
}
public List<Setter> getSetters() {
if ( this.setters == null ) {
this.setters = new ArrayList<Setter>();
}
return this.setters;
}
public void setSetters(List<Setter> setters) {
this.setters = setters;
}
private String getMvelExpr() {
StringBuilder sbuilder = new StringBuilder();
sbuilder.append( "with (this) {\n" );
int i = 0;
for ( Setter setter : this.setters ) {
if ( i++ > 0 ) {
sbuilder.append( "," );
}
if (ALLOW_MODIFY_EXPRESSIONS) {
sbuilder.append( setter.getAccessor() + " = '" + setter.getValue() + "'\n" );
} else {
sbuilder.append( setter.getAccessor() + " = '" + setter.getValue().replace("\"", "") + "'\n" );
}
}
sbuilder.append( "}" );
return sbuilder.toString();
}
public String toString() {
return "modify() " + getMvelExpr();
}
@XmlRootElement(name="set")
public static class SetterImpl
implements
Setter {
@XmlAttribute
private String accessor;
@XmlAttribute
private String value;
public SetterImpl() {
}
public SetterImpl(String accessor,
String value) {
this.accessor = accessor;
this.value = value;
}
public String getAccessor() {
return accessor;
}
public String getValue() {
return value;
}
}
// public static class JaxbSetterWrapper<SetterImpl> extends ArrayList<SetterImpl> {
//
// public JaxbSetterWrapper() {
// super();
// }
//
// public JaxbSetterWrapper(Collection<SetterImpl> c) {
// super(c);
// }
//
// public JaxbSetterWrapper(int initialCapacity) {
// super(initialCapacity);
// }
//
// @XmlElement(name="setters")
// public List<SetterImpl> getElements() {
// return this;
// }
//
// public void setElements(List<SetterImpl> elems) {
// clear();
// if (elems != null) {
// addAll(elems);
// }
// }
// }
public static class JaxbSetterAdapter extends XmlAdapter<SetterImpl[], List<SetterImpl>> {
@Override
public SetterImpl[] marshal(List<SetterImpl> v) throws Exception {
return v.toArray( new SetterImpl[ v.size() ] );
}
@Override
public List<SetterImpl> unmarshal(SetterImpl[] v) throws Exception {
return Arrays.asList( v );
}
}
}