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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.activiti.engine.impl.bpmn.data;

import java.io.Serializable;

import org.activiti.engine.delegate.DelegateExecution;
import org.activiti.engine.delegate.Expression;

/**
 * A data association (Input or Output) between a source and a target
 * 

 */
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;
  }
}