taverna-activity-palette-api/src/main/java/org/apache/taverna/servicedescriptions/IdentifiedObject.java

/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.taverna.servicedescriptions;

import java.util.List;

import org.apache.taverna.lang.beans.PropertyAnnotated;

public abstract class IdentifiedObject extends PropertyAnnotated {
	@Override
	public boolean equals(Object obj) {
		if (!(obj instanceof IdentifiedObject))
			return false;
		List<? extends Object> myIdentifyingData = getIdentifyingData();
		if (myIdentifyingData == null)
			return super.equals(obj);
		if (!getClass().isInstance(obj) && obj.getClass().isInstance(this))
			return false;
		IdentifiedObject id = (IdentifiedObject) obj;
		return myIdentifyingData.equals(id.getIdentifyingData());
	}

	@Override
	public int hashCode() {
		List<? extends Object> identifyingData = getIdentifyingData();
		if (identifyingData == null)
			return super.hashCode();
		return identifyingData.hashCode();
	}

	protected abstract List<? extends Object> getIdentifyingData();
}