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/* 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.flowable.engine.impl.bpmn.data;

import java.io.Serializable;

import org.flowable.common.engine.api.delegate.Expression;
import org.flowable.engine.delegate.DelegateExecution;

/**
 * A data association (Input or Output) between a source and a target
 * 
 * @author Esteban Robles Luna
 */
public abstract class AbstractDataAssociation implements Serializable {

    private static final long serialVersionUID = 1L;

    protected String source;

    protected Expression sourceExpression;

    protected String target;

    protected AbstractDataAssociation(String source, String target) {
        this.source = source;
        this.target = target;
    }

    protected AbstractDataAssociation(Expression sourceExpression, String target) {
        this.sourceExpression = sourceExpression;
        this.target = target;
    }

    public abstract void evaluate(DelegateExecution execution);

    public String getSource() {
        return source;
    }

    public String getTarget() {
        return target;
    }

    public Expression getSourceExpression() {
        return sourceExpression;
    }
}