/**
* Copyright 2005 Red Hat, Inc. and/or its affiliates.
*
* 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.jbpm.process.instance.impl;
import java.io.Externalizable;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import org.kie.api.definition.process.Connection;
import org.drools.core.spi.CompiledInvoker;
import org.drools.core.spi.ProcessContext;
import org.drools.core.spi.Wireable;
import org.jbpm.process.instance.ProcessInstance;
import org.jbpm.workflow.core.Constraint;
import org.jbpm.workflow.instance.NodeInstance;
/**
* Default implementation of a constraint.
*
*/
public class ReturnValueConstraintEvaluator
implements
Constraint,
ConstraintEvaluator,
Wireable,
Externalizable {
private static final long serialVersionUID = 510l;
private String name;
private String constraint;
private int priority;
private String dialect;
private String type;
private boolean isDefault = false;
public ReturnValueConstraintEvaluator() {
}
private ReturnValueEvaluator evaluator;
public String getConstraint() {
return this.constraint;
}
public void setConstraint(final String constraint) {
this.constraint = constraint;
}
public String getName() {
return this.name;
}
public void setName(final String name) {
this.name = name;
}
public String toString() {
return this.name;
}
public int getPriority() {
return this.priority;
}
public void setPriority(final int priority) {
this.priority = priority;
}
public String getDialect() {
return dialect;
}
public void setDialect(String dialect) {
this.dialect = dialect;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public boolean isDefault() {
return isDefault;
}
public void setDefault(boolean isDefault) {
this.isDefault = isDefault;
}
public void wire(Object object) {
setEvaluator( (ReturnValueEvaluator) object );
}
public void setEvaluator(ReturnValueEvaluator evaluator) {
this.evaluator = evaluator;
}
public ReturnValueEvaluator getReturnValueEvaluator() {
return this.evaluator;
}
public boolean evaluate(NodeInstance instance,
Connection connection,
Constraint constraint) {
Object value;
try {
ProcessContext context = new ProcessContext(((ProcessInstance)instance.getProcessInstance()).getKnowledgeRuntime());
context.setNodeInstance( instance );
value = this.evaluator.evaluate( context );
} catch ( Exception e ) {
throw new RuntimeException( "unable to execute ReturnValueEvaluator: ",
e );
}
if ( !(value instanceof Boolean) ) {
throw new RuntimeException( "Constraints must return boolean values: " + value + " for expression " + constraint);
}
return ((Boolean) value).booleanValue();
}
public void readExternal(ObjectInput in) throws IOException,
ClassNotFoundException {
this.evaluator = (ReturnValueEvaluator) in.readObject();
this.name = in.readUTF();
this.constraint = (String) in.readObject();
this.priority = in.readInt();
this.dialect = in.readUTF();
this.type = (String) in.readObject();
}
public void writeExternal(ObjectOutput out) throws IOException {
if ( this.evaluator instanceof CompiledInvoker ) {
out.writeObject( null );
} else {
out.writeObject( this.evaluator );
}
out.writeUTF( this.name );
out.writeObject( this.constraint );
out.writeInt( this.priority );
out.writeUTF( dialect );
out.writeObject( type );
}
public void setMetaData(String name, Object value) {
// Do nothing
}
public Object getMetaData(String name) {
return null;
}
}