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The Drools and jBPM public API which is backwards compatible between releases.

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/*
 * Copyright 2015 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.
 * 
 *      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.impl.adapters;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

import org.drools.runtime.process.NodeInstance;
import org.kie.api.runtime.process.WorkflowProcessInstance;

public class WorkflowProcessInstanceAdapter extends ProcessInstanceAdapter implements org.drools.runtime.process.WorkflowProcessInstance {

    public WorkflowProcessInstanceAdapter(WorkflowProcessInstance delegate) {
        super(delegate);
    }
    
    public WorkflowProcessInstance getDelegate() {
    	return (WorkflowProcessInstance) super.getDelegate();
    }

	public Collection getNodeInstances() {
		Collection nodeInstances = getDelegate().getNodeInstances();
		if (nodeInstances == null) {
			return null;
		}
		List result = new ArrayList(nodeInstances.size());
		for (org.kie.api.runtime.process.NodeInstance nodeInstance: nodeInstances) {
			result.add(new NodeInstanceAdapter(nodeInstance));
		}
		return result;
	}

	public NodeInstance getNodeInstance(long nodeInstanceId) {
		org.kie.api.runtime.process.NodeInstance nodeInstance = getDelegate().getNodeInstance(nodeInstanceId);
		if (nodeInstance == null) {
			return null;
		} else {
			return new NodeInstanceAdapter(nodeInstance);
		}
	}

	public Object getVariable(String name) {
		return getDelegate().getVariable(name);
	}

	public void setVariable(String name, Object value) {
		getDelegate().setVariable(name, value);		
	}

    @Override
    public int hashCode() {
        return delegate.hashCode();
    }

    @Override
    public boolean equals(Object obj) {
        return obj instanceof WorkflowProcessInstanceAdapter && delegate.equals(((WorkflowProcessInstanceAdapter)obj).delegate);
    }
}