org.apache.cayenne.property.ListProperty Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of cayenne-client-nodeps

Cayenne Object Persistence Framework

There is a newer version: 2.0.4

/*****************************************************************
 *   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.property;

import org.apache.cayenne.Fault;
import org.apache.cayenne.Persistent;
import org.apache.cayenne.ValueHolder;
import org.apache.cayenne.util.PersistentObjectList;

/**
 * Provides access to a property implemented as a List Field.
 * 
 * @since 1.2
 * @author Andrus Adamchik
 */
public class ListProperty extends AbstractCollectionProperty {

    public ListProperty(ClassDescriptor owner, ClassDescriptor targetDescriptor,
            PropertyAccessor accessor, String reverseName) {
        super(owner, targetDescriptor, accessor, reverseName);
    }

    /**
     * Creates a List for an object. Expects an object to be an instance of Persistent.
     */
    protected ValueHolder createCollectionValueHolder(Object object)
            throws PropertyAccessException {
        if (!(object instanceof Persistent)) {

            throw new PropertyAccessException(
                    "ValueHolders for non-persistent objects are not supported.",
                    this,
                    object);
        }

        return new PersistentObjectList((Persistent) object, getName());
    }

    public boolean isFault(Object object) {
        Object target = accessor.readPropertyDirectly(object);
        return target == null
                || target instanceof Fault
                || ((ValueHolder) target).isFault();
    }
}