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/**
*
* Copyright 2005 The Apache Software Foundation or its licensors, as applicable.
*
* Licensed 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.impl;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import org.apache.tuscany.das.rdb.config.Column;
import org.apache.tuscany.das.rdb.config.Config;
import org.apache.tuscany.das.rdb.config.KeyPair;
import org.apache.tuscany.das.rdb.config.Relationship;
import org.apache.tuscany.das.rdb.config.Table;
import org.apache.tuscany.das.rdb.config.wrapper.MappingWrapper;
import org.apache.tuscany.das.rdb.util.DebugUtil;
import commonj.sdo.DataObject;
import commonj.sdo.Property;
/**
* DatabaseObject wraps DataObject. If a field is an FK field, it will return
* the value from the parent.
*
*
*/
public class DatabaseObject {
private final MappingWrapper mappingWrapper;
private final DataObject dataObject;
private Property parentReference;
private static final boolean debug = false;
private HashMap keyMappings = new HashMap();
public DatabaseObject(Config model, DataObject changedObject) {
this.mappingWrapper = new MappingWrapper(model);
this.dataObject = changedObject;
initialize();
}
// Initialize Key Mappings
private void initialize() {
if (mappingWrapper.getConfig() != null) {
List relationships = mappingWrapper.getConfig().getRelationship();
Iterator i = relationships.iterator();
while (i.hasNext()) {
Relationship r = (Relationship) i.next();
DebugUtil.debugln(getClass(), debug, "Initializing relationship: " + r.getName());
if (r.getForeignKeyTable().equals(getTypeName())) {
List pairs = r.getKeyPair();
Iterator iter = pairs.iterator();
while (iter.hasNext()) {
KeyPair pair = (KeyPair) iter.next();
keyMappings.put(pair.getForeignKeyColumn(), r);
}
}
}
}
}
public Object get(String parameter) {
if (isPartOfPrimaryKey(parameter))
return dataObject.get(parameter);
Relationship r = (Relationship) keyMappings.get(parameter);
if (r == null)
return dataObject.get(parameter);
Property parentRef = getParentReference(r.getPrimaryKeyTable());
DataObject parent = dataObject.getDataObject(parentRef);
if (parent == null)
return null;
String parentKey = getParentKey(r, parameter);
return parent.get(parentKey);
}
private String getParentKey(Relationship r, String parameter) {
List keyPairs = r.getKeyPair();
Iterator i = keyPairs.iterator();
while (i.hasNext()) {
KeyPair pair = (KeyPair) i.next();
if (pair.getForeignKeyColumn().equals(parameter))
return pair.getPrimaryKeyColumn();
}
return null;
}
public Property getParentReference(String parentName) {
if (this.parentReference == null) {
Iterator i = dataObject.getType().getProperties().iterator();
while (i.hasNext()) {
Property ref = (Property) i.next();
if ((!ref.getType().isDataType()) && (ref.getType().getName().equals(parentName))) {
this.parentReference = ref;
}
}
}
return this.parentReference;
}
public String getTableName() {
if (mappingWrapper.getConfig() != null)
return mappingWrapper.getTableByPropertyName(getTypeName()).getName();
else
return null;
}
public String getTypeName() {
return dataObject.getType().getName();
}
public void setPropagatedID(String propagatedID, int id) {
dataObject.setInt(propagatedID, id);
}
private boolean isPartOfPrimaryKey(String parameter) {
if (mappingWrapper.getConfig() == null)
return false;
Table t = mappingWrapper.getTable(getTableName());
if (t == null)
return false;
Column c = mappingWrapper.getColumnByPropertyName(t, parameter);
if (c == null)
return false;
return c.isPrimaryKey();
}
}
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