com.acme.gwt.server.InjectingLocator.java Source code

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Here is the source code for com.acme.gwt.server.InjectingLocator.java

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/**
 *  Copyright 2011 Colin Alworth
 *
 *  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 com.acme.gwt.server;

import javax.persistence.EntityManager;

import com.acme.gwt.data.HasVersionAndId;
import com.google.gwt.requestfactory.shared.Locator;
import com.google.inject.Inject;
import com.google.inject.Injector;
import com.google.inject.Provider;

/**
 * Simple Locator for entity types, with basic data creation and finding pass along to another
 * service, provided by the server module
 *
 * @author colin
 */
public class InjectingLocator<T extends HasVersionAndId> extends Locator<T, Long> {
    @Inject
    Provider<EntityManager> data;

    @Inject
    Injector injector;

    @Override
    public T create(Class<? extends T> clazz) {
        return injector.getInstance(clazz);
    }

    @Override
    public T find(Class<? extends T> clazz, Long id) {
        return data.get().find(clazz, id);
    }

    @Override
    public Class<T> getDomainType() {
        throw new UnsupportedOperationException();//unused, and if it becomes used, we're in trouble
    }

    @Override
    public Long getId(T domainObject) {
        return domainObject.getId();
    }

    @Override
    public Class<Long> getIdType() {
        return Long.class;
    }

    @Override
    public Object getVersion(T domainObject) {
        return domainObject.getVersion();
    }
}