/**
 * 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.spi;

import org.drools.runtime.KnowledgeRuntime;
import org.drools.runtime.process.NodeInstance;
import org.drools.runtime.process.ProcessInstance;
import org.drools.runtime.process.WorkflowProcessInstance;

public class ProcessContext implements org.drools.runtime.process.ProcessContext {
    
	private KnowledgeRuntime kruntime;
	private ProcessInstance processInstance;
    private NodeInstance nodeInstance;
    
    public ProcessContext(KnowledgeRuntime kruntime) {
    	this.kruntime = kruntime;
    }

    public ProcessInstance getProcessInstance() {
    	if (processInstance != null) {
    		return processInstance;
    	}
    	if (nodeInstance != null) {
    		return (ProcessInstance) nodeInstance.getProcessInstance();
    	}
    	return null;
    }

    public void setProcessInstance(ProcessInstance processInstance) {
        this.processInstance = processInstance;
    }
    
    public NodeInstance getNodeInstance() {
        return nodeInstance;
    }

    public void setNodeInstance(NodeInstance nodeInstance) {
        this.nodeInstance = nodeInstance;
    }
    
    public Object getVariable(String variableName) {
    	if (nodeInstance != null) {
	    	return nodeInstance.getVariable(variableName);
    	} else {
    		return ((WorkflowProcessInstance) getProcessInstance()).getVariable(variableName);
    	}
    }
    
    public void setVariable(String variableName, Object value) {
    	if (nodeInstance != null) {
    		nodeInstance.setVariable(variableName, value);
    	} else {
    		((WorkflowProcessInstance) getProcessInstance()).setVariable(variableName, value);
    	}
    }

	public KnowledgeRuntime getKnowledgeRuntime() {
		return kruntime;
	}
    
}