/*
* 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.brooklyn.core.relations;
import org.apache.brooklyn.api.relations.RelationshipType;
import com.google.common.base.Objects;
public class RelationshipTypes {
private static abstract class AbstractBasicRelationship<SourceType,TargetType> implements RelationshipType<SourceType,TargetType> {
private final String relationshipTypeName;
private final String sourceName;
private final String sourceNamePlural;
private final Class<TargetType> targetType;
private AbstractBasicRelationship(String relationshipTypeName, String sourceName, String sourceNamePlural, Class<TargetType> targetType) {
this.relationshipTypeName = relationshipTypeName;
this.sourceName = sourceName;
this.sourceNamePlural = sourceNamePlural;
this.targetType = targetType;
}
@Override
public String getRelationshipTypeName() {
return relationshipTypeName;
}
@Override
public String getSourceName() {
return sourceName;
}
@Override
public String getSourceNamePlural() {
return sourceNamePlural;
}
@Override
public Class<TargetType> getTargetType() {
return targetType;
}
@Override
public boolean equals(Object obj) {
if (this == obj) return true;
if (obj == null) return false;
if (!(obj instanceof AbstractBasicRelationship)) return false;
@SuppressWarnings("rawtypes")
AbstractBasicRelationship other = (AbstractBasicRelationship) obj;
// only look at type name and class; name of source and target is informational
if (!Objects.equal(relationshipTypeName, other.relationshipTypeName)) return false;
if (!Objects.equal(getSourceType(), other.getSourceType())) return false;
if (!Objects.equal(targetType, other.targetType)) return false;
if (getInverseRelationshipType() == null) {
// require both null or...
if (other.getInverseRelationshipType() != null)
return false;
} else {
// ... they have same type name
// (don't recurse as that sets up infinite loop)
if (other.getInverseRelationshipType() == null)
return false;
if (!Objects.equal(getInverseRelationshipType().getRelationshipTypeName(), other.getInverseRelationshipType().getRelationshipTypeName())) return false;
}
return true;
}
@Override
public int hashCode() {
// comments as per equals
return Objects.hashCode(relationshipTypeName, getSourceType(), targetType,
getInverseRelationshipType()!=null ? getInverseRelationshipType().getRelationshipTypeName() : null);
}
@Override
public String toString() {
return relationshipTypeName;
}
}
private static class BasicRelationshipWithInverse<SourceType,TargetType> extends AbstractBasicRelationship<SourceType,TargetType> {
private BasicRelationshipWithInverse<TargetType,SourceType> inverseRelationshipType;
private BasicRelationshipWithInverse(String relationshipTypeName, String sourceName, String sourceNamePlural, Class<TargetType> targetType) {
super(relationshipTypeName, sourceName, sourceNamePlural, targetType);
}
@Override
public RelationshipType<TargetType,SourceType> getInverseRelationshipType() {
return inverseRelationshipType;
}
@Override
public Class<SourceType> getSourceType() {
if (getInverseRelationshipType()==null) return null;
return getInverseRelationshipType().getTargetType();
}
@Override
public String getTargetName() {
if (getInverseRelationshipType()==null) return null;
return getInverseRelationshipType().getSourceName();
}
@Override
public String getTargetNamePlural() {
if (getInverseRelationshipType()==null) return null;
return getInverseRelationshipType().getSourceNamePlural();
}
}
private static class BasicRelationshipOneWay<SourceType,TargetType> extends AbstractBasicRelationship<SourceType,TargetType> {
private final String targetName;
private final String targetNamePlural;
private final Class<SourceType> sourceType;
private BasicRelationshipOneWay(String sourceName, String sourceNamePlural, Class<SourceType> sourceType, String toTargetRelationshipTypeName,
String targetName, String targetNamePlural, Class<TargetType> targetType) {
super(toTargetRelationshipTypeName, sourceName, sourceNamePlural, targetType);
this.targetName = targetName;
this.targetNamePlural = targetNamePlural;
this.sourceType = sourceType;
}
@Override
public Class<SourceType> getSourceType() {
return sourceType;
}
@Override
public String getTargetName() {
return targetName;
}
@Override
public String getTargetNamePlural() {
return targetNamePlural;
}
@Override
public RelationshipType<TargetType, SourceType> getInverseRelationshipType() {
return null;
}
}
public static <SourceType,TargetType> RelationshipType<SourceType,TargetType> newRelationshipPair(
String sourceName, String sourceNamePlural, Class<SourceType> sourceType, String toTargetRelationshipTypeName,
String targetName, String targetNamePlural, Class<TargetType> targetType, String toSourceRelationshipTypeName) {
BasicRelationshipWithInverse<SourceType, TargetType> r1 = new BasicRelationshipWithInverse<SourceType, TargetType>(
toTargetRelationshipTypeName, sourceName, sourceNamePlural, targetType);
BasicRelationshipWithInverse<TargetType, SourceType> r2 = new BasicRelationshipWithInverse<TargetType, SourceType>(
toSourceRelationshipTypeName, targetName, targetNamePlural, sourceType);
r1.inverseRelationshipType = r2;
r2.inverseRelationshipType = r1;
return r1;
}
public static <SourceType,TargetType> RelationshipType<SourceType,TargetType> newRelationshipOneway(
String sourceName, String sourceNamePlural, Class<SourceType> sourceType, String toTargetRelationshipTypeName,
String targetName, String targetNamePlural, Class<TargetType> targetType) {
return new BasicRelationshipOneWay<SourceType,TargetType>(
sourceName, sourceNamePlural, sourceType, toTargetRelationshipTypeName,
targetName, targetNamePlural, targetType);
}
}