/*****************************************************************
* 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.cayenne.dbsync.merge.token.db;
import org.apache.cayenne.dba.DbAdapter;
import org.apache.cayenne.dba.QuotingStrategy;
import org.apache.cayenne.dbsync.merge.factory.MergerTokenFactory;
import org.apache.cayenne.dbsync.merge.token.MergerToken;
import org.apache.cayenne.map.DbEntity;
import org.apache.cayenne.map.DbRelationship;
import org.apache.cayenne.dbsync.reverse.dbload.DbRelationshipDetected;
import java.util.Collections;
import java.util.List;
public class DropRelationshipToDb extends AbstractToDbToken.Entity {
private DbRelationship relationship;
public DropRelationshipToDb(DbEntity entity, DbRelationship relationship) {
super("Drop foreign key", 10, entity);
this.relationship = relationship;
}
public String getFkName() {
if (relationship instanceof DbRelationshipDetected) {
return ((DbRelationshipDetected) relationship).getFkName();
}
return null;
}
@Override
public List<String> createSql(DbAdapter adapter) {
if (isEmpty()) {
return Collections.emptyList();
}
QuotingStrategy context = adapter.getQuotingStrategy();
return Collections.singletonList(
"ALTER TABLE " + context.quotedFullyQualifiedName(getEntity()) + " DROP CONSTRAINT " + getFkName());
}
public MergerToken createReverse(MergerTokenFactory factory) {
return factory.createAddRelationshipToModel(getEntity(), relationship);
}
@Override
public boolean isEmpty() {
return getFkName() == null || relationship.isToMany();
}
@Override
public String getTokenValue() {
if(relationship.isToMany()) {
return "Skip. No sql representation.";
}
return relationship.getSourceEntity().getName() + "->" + relationship.getTargetEntityName();
}
}