corner.orm.gae.impl.JpaEntityServiceImpl.java Source code

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Here is the source code for corner.orm.gae.impl.JpaEntityServiceImpl.java

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/* 
 * Copyright 2009 The Corner Team.
 * 
 * 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 corner.orm.gae.impl;

import java.util.Iterator;

import org.apache.tapestry5.ioc.services.PropertyAccess;
import org.apache.tapestry5.ioc.services.TypeCoercer;
import org.springframework.dao.DataAccessException;
import org.springframework.orm.ObjectRetrievalFailureException;
import org.springframework.orm.jpa.JpaTemplate;

import corner.orm.EntityConstants;
import corner.orm.model.PaginationList;
import corner.orm.model.PaginationOptions;
import corner.orm.services.EntityService;

/**
 * provider access JPA.
 * 
 * @author <a href="mailto:jun.tsai@gmail.com">Jun Tsai</a>
 * @version $Revision$
 * @since 0.1
 */
public class JpaEntityServiceImpl implements EntityService {
    private JpaTemplate jpaTemplate;
    private PaginatedJapEntityService paginatedJpaEntityService;
    private PropertyAccess propertyAccess;

    public JpaEntityServiceImpl(JpaTemplate jpaTemplate, final TypeCoercer typeCoercer,
            PropertyAccess propertyAccess) {
        this.jpaTemplate = jpaTemplate;
        paginatedJpaEntityService = new PaginatedJapEntityService(jpaTemplate, typeCoercer);
        this.propertyAccess = propertyAccess;
    }

    /**
     * @see corner.orm.services.EntityService#find(java.lang.Class,
     *      java.lang.Object, java.lang.String, int, int)
     */
    @Override
    public <T> Iterator<T> find(Class<T> persistClass, Object conditions, String order, int start, int offset) {
        return paginatedJpaEntityService.find(persistClass, conditions, order, start, offset);
    }

    /**
     * @see corner.orm.services.EntityService#count(java.lang.Class,
     *      java.lang.Object)
     */
    @Override
    public long count(Class<?> persistClass, Object conditions) {
        return paginatedJpaEntityService.count(persistClass, conditions);
    }

    /**
     * @see corner.orm.services.EntityService#find(java.lang.Class,
     *      java.lang.Object, java.lang.String)
     */
    @Override
    public <T> Iterator<T> find(Class<T> persistClass, Object conditions, String order) {
        return find(persistClass, conditions, order, 0, Integer.MAX_VALUE);
    }

    /**
     * @see corner.orm.services.EntityService#paginate(java.lang.Class,
     *      java.lang.Object, java.lang.String,
     *      corner.orm.model.PaginationOptions)
     */
    @Override
    public <T> PaginationList<T> paginate(Class<T> persistClass, Object conditions, String order,
            PaginationOptions options) {
        return paginatedJpaEntityService.paginate(persistClass, conditions, order, options);
    }

    /**
     * @see corner.orm.services.EntityService#get(java.lang.Class,
     *      java.lang.Object)
     */
    @Override
    public <T> T get(Class<T> entityClass, Object id) throws DataAccessException {
        return this.jpaTemplate.find(entityClass, id);
    }

    /**
     * @see corner.orm.services.EntityService#update(java.lang.Object)
     */
    @Override
    public <T> void update(T entity) throws DataAccessException {
        this.jpaTemplate.merge(entity);
    }

    /**
     * @see corner.orm.services.EntityService#save(java.lang.Object)
     */
    @Override
    public <T> void save(T entity) throws DataAccessException {
        this.jpaTemplate.persist(entity);
    }

    /**
     * @see corner.orm.services.EntityService#refresh(java.lang.Object)
     */
    @Override
    public <T> void refresh(T entity) throws DataAccessException {
        this.jpaTemplate.refresh(entity);
    }

    /**
     * @see corner.orm.services.EntityService#delete(java.lang.Object)
     */
    @Override
    public <T> void delete(T entity) throws DataAccessException {
        this.jpaTemplate.remove(entity);
    }

    /**
     * @see corner.orm.services.EntityService#saveOrUpdate(java.lang.Object)
     */
    @Override
    public <T> void saveOrUpdate(T entity) {
        if (propertyAccess.get(entity, EntityConstants.ID_PROPERTY_NAME) == null) {
            // new entity,so persist
            save(entity);
        } else {
            // old entity,so modify
            update(entity);
        }
    }

    /**
     * @see corner.orm.services.EntityService#getEntityClass(java.lang.Object)
     */
    @Override
    public Class<?> getEntityClass(Object entity) {
        return entity.getClass();
    }

    /**
     * @see corner.orm.services.EntityService#findUnique(java.lang.Class,
     *      java.lang.Object[])
     */
    @Override
    public <T> T findUnique(Class<T> clazz, Object[] conditions) {
        Iterator<T> it = this.find(clazz, conditions, null);
        T result = null;
        if (it.hasNext()) {
            result = it.next();
        }
        if (it.hasNext()) {
            throw new ObjectRetrievalFailureException("?!,?.", null);
        }
        return result;
    }
}