/*
* 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.tuscany.das.rdb.graphbuilder.impl;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import org.apache.log4j.Logger;
import org.apache.tuscany.das.rdb.config.KeyPair;
import org.apache.tuscany.das.rdb.config.Relationship;
import org.apache.tuscany.das.rdb.config.wrapper.MappingWrapper;
import commonj.sdo.DataObject;
import commonj.sdo.Property;
public class RowObjects {
private final Logger logger = Logger.getLogger(RowObjects.class);
private Map objectsByTableName;
private List tableObjects;
private final GraphBuilderMetadata metadata;
private final TableRegistry registry;
public RowObjects(GraphBuilderMetadata metadata, TableRegistry registry) {
objectsByTableName = new HashMap();
tableObjects = new ArrayList();
this.metadata = metadata;
this.registry = registry;
}
public void put(String key, DataObject value) {
objectsByTableName.put(key, value);
tableObjects.add(value);
}
public DataObject get(String tablePropertyName) {
return (DataObject) objectsByTableName.get(tablePropertyName);
}
void processRelationships() {
MappingWrapper wrapper = metadata.getConfigWrapper();
if (wrapper.hasRecursiveRelationships()) {
processRecursiveRelationships(wrapper);
return;
}
Iterator i = metadata.getRelationships().iterator();
while (i.hasNext()) {
Relationship r = (Relationship) i.next();
DataObject parentTable = get(wrapper.getTableTypeName(r.getPrimaryKeyTable()));
DataObject childTable = get(wrapper.getTableTypeName(r.getForeignKeyTable()));
if (this.logger.isDebugEnabled()) {
this.logger.debug("Parent table: " + parentTable);
this.logger.debug("Child table: " + childTable);
}
if ((parentTable == null) || (childTable == null)) {
continue;
}
Property p = parentTable.getType().getProperty(r.getName());
setOrAdd(parentTable, childTable, p);
}
}
private void processRecursiveRelationships(MappingWrapper wrapper) {
Iterator i = tableObjects.iterator();
while (i.hasNext()) {
DataObject table = (DataObject) i.next();
Iterator relationships = wrapper.getRelationshipsByChildTable(table.getType().getName()).iterator();
while (relationships.hasNext()) {
Relationship r = (Relationship) relationships.next();
DataObject parentTable = findParentTable(table, r, wrapper);
if (parentTable == null) {
continue;
}
Property p = parentTable.getType().getProperty(r.getName());
setOrAdd(parentTable, table, p);
}
}
}
private void setOrAdd(DataObject parent, DataObject child, Property p) {
if (p.isMany()) {
parent.getList(p).add(child);
} else {
parent.set(p, child);
}
}
private DataObject findParentTable(DataObject childTable, Relationship r, MappingWrapper wrapper) {
List fkValue = new ArrayList();
Iterator keyPairs = r.getKeyPair().iterator();
while (keyPairs.hasNext()) {
KeyPair pair = (KeyPair) keyPairs.next();
String childProperty = wrapper.getColumnPropertyName(r.getPrimaryKeyTable(), pair.getForeignKeyColumn());
Property p = childTable.getType().getProperty(childProperty);
fkValue.add(childTable.get(p));
}
if (this.logger.isDebugEnabled()) {
this.logger.debug("Trying to find parent of " + r.getForeignKeyTable() + " with FK " + fkValue);
}
DataObject parentTable = registry.get(r.getPrimaryKeyTable(), fkValue);
if (this.logger.isDebugEnabled()) {
this.logger.debug("Parent table from registry: " + parentTable);
}
return parentTable;
}
}