/*
* 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.openejb.core.cmp;
import org.apache.openejb.OpenEJBException;
import javax.ejb.EJBException;
import javax.ejb.EntityBean;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
public class ComplexKeyGenerator extends AbstractKeyGenerator {
protected final List<PkField> fields;
private final Class pkClass;
public ComplexKeyGenerator(final Class entityBeanClass, final Class pkClass) throws OpenEJBException {
this.pkClass = pkClass;
final List<ComplexKeyGenerator.PkField> fields = new ArrayList<PkField>();
for (final Field pkObjectField : pkClass.getFields()) {
if (isValidPkField(pkObjectField)) {
final Field entityBeanField = getField(entityBeanClass, pkObjectField.getName());
if (!isValidPkField(entityBeanField)) {
throw new OpenEJBException("Invalid primray key field: " + entityBeanField);
}
final PkField pkField = new PkField(entityBeanField, pkObjectField);
fields.add(pkField);
}
}
this.fields = Collections.unmodifiableList(fields);
}
public Object getPrimaryKey(final EntityBean bean) {
Object pkObject = null;
try {
pkObject = pkClass.newInstance();
} catch (final Exception e) {
throw new EJBException("Unable to create complex primary key instance: " + pkClass.getName(), e);
}
for (final PkField pkField : fields) {
pkField.copyToPkObject(bean, pkObject);
}
return pkObject;
}
protected static class PkField {
private final Field entityBeanField;
private final Field pkObjectField;
public PkField(final Field entityBeanField, final Field pkObjectField) {
entityBeanField.setAccessible(true);
pkObjectField.setAccessible(true);
this.entityBeanField = entityBeanField;
this.pkObjectField = pkObjectField;
}
public void copyToPkObject(final EntityBean bean, final Object pkObject) {
final Object value = getFieldValue(entityBeanField, bean);
setFieldValue(pkObjectField, pkObject, value);
}
public Object getPkFieldValue(final Object pkObject) {
final Object value = getFieldValue(pkObjectField, pkObject);
return value;
}
}
}