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* 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
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****************************************************************/
package org.apache.cayenne.access;
import org.apache.cayenne.ObjectId;
import org.apache.cayenne.map.DbEntity;
import org.apache.cayenne.map.DbRelationship;
import org.apache.cayenne.util.EqualsBuilder;
import org.apache.cayenne.util.HashCodeBuilder;
/**
* An id similar to ObjectId that identifies a DbEntity snapshot for implicit
* DbEntities of flattened attributes or relationships. Provides 'equals' and
* 'hashCode' implementations adequate for use as a map key.
*
* @since 3.2
*/
final class DbArcId {
private int hashCode;
private ObjectId sourceId;
private DbRelationship incomingArc;
private DbEntity entity;
DbArcId(ObjectId sourceId, DbRelationship incomingArc) {
this.sourceId = sourceId;
this.incomingArc = incomingArc;
}
DbEntity getEntity() {
if (entity == null) {
entity = (DbEntity) incomingArc.getTargetEntity();
}
return entity;
}
ObjectId getSourceId() {
return sourceId;
}
DbRelationship getIncominArc() {
return incomingArc;
}
@Override
public int hashCode() {
if (this.hashCode == 0) {
HashCodeBuilder builder = new HashCodeBuilder(3, 5);
builder.append(sourceId);
builder.append(incomingArc.getName());
this.hashCode = builder.toHashCode();
}
return hashCode;
}
@Override
public boolean equals(Object object) {
if (this == object) {
return true;
}
if (!(object instanceof DbArcId)) {
return false;
}
DbArcId id = (DbArcId) object;
return new EqualsBuilder().append(sourceId, id.sourceId)
.append(incomingArc.getName(), id.incomingArc.getName())
.isEquals();
}
}