/*****************************************************************
* 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.reflect;
import java.util.HashMap;
import java.util.Map;
import org.apache.cayenne.map.ObjAttribute;
import org.apache.cayenne.map.ObjEntity;
import org.apache.cayenne.query.EntityResultSegment;
/**
* @since 3.0
*/
class PersistentDescriptorResultMetadata implements EntityResultSegment {
ClassDescriptor classDescriptor;
Map<String, String> fields;
Map<String, String> reverseFields;
PersistentDescriptorResultMetadata(ClassDescriptor classDescriptor) {
this.classDescriptor = classDescriptor;
this.fields = new HashMap<String, String>();
this.reverseFields = new HashMap<String, String>();
}
public ClassDescriptor getClassDescriptor() {
return classDescriptor;
}
public Map<String, String> getFields() {
return fields;
}
public String getColumnPath(String resultSetLabel) {
return reverseFields.get(resultSetLabel);
}
void addObjectField(String attributeName, String column) {
ObjEntity entity = classDescriptor.getEntity();
ObjAttribute attribute = (ObjAttribute) entity.getAttribute(attributeName);
fields.put(attribute.getDbAttributePath(), column);
reverseFields.put(column, attribute.getDbAttributePath());
}
/**
* Adds a result set column mapping for a single object property of a specified entity
* that may differ from the root entity if inheritance is involved.
*/
void addObjectField(String entityName, String attributeName, String column) {
ObjEntity entity = classDescriptor.getEntity().getDataMap().getObjEntity(
entityName);
ObjAttribute attribute = (ObjAttribute) entity.getAttribute(attributeName);
fields.put(attribute.getDbAttributePath(), column);
reverseFields.put(column, attribute.getDbAttributePath());
}
/**
* Adds a result set column mapping for a single DbAttribute.
*/
void addDbField(String dbAttributeName, String column) {
fields.put(dbAttributeName, column);
reverseFields.put(column, dbAttributeName);
}
public int getColumnOffset() {
throw new UnsupportedOperationException(
"Column offset only makes sense in the context of a query");
}
}