org.shept.persistence.provider.ScrollingListProviderFactory.java Source code

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Here is the source code for org.shept.persistence.provider.ScrollingListProviderFactory.java

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/*
 * Copyright 2007-2011 the original author or authors.
 *
 * 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 org.shept.persistence.provider;

import org.shept.beans.support.ExampleDefinition;
import org.shept.beans.support.FilterDefinition;
import org.shept.beans.support.QueryDefinition;
import org.shept.beans.support.ReloadableAssociation;
import org.shept.org.springframework.orm.hibernate3.support.HibernateDaoSupportExtended;
import org.shept.persistence.provider.hibernate.HibernateAssociationProvider;
import org.shept.persistence.provider.hibernate.HibernateCriteriaDefinition;
import org.shept.persistence.provider.hibernate.HibernateCriteriaListProviderImpl;
import org.shept.persistence.provider.hibernate.HibernateExampleListProviderImpl;
import org.shept.persistence.provider.hibernate.HibernateQueryListProviderImpl;
import org.shept.persistence.provider.hibernate.UnsupportedFilterException;
import org.springframework.beans.BeanUtils;
import org.springframework.dao.support.DaoSupport;
import org.springframework.orm.hibernate3.support.HibernateDaoSupport;

/** 
 * @author $Author: aha $
 * @version $Revision: 33 $
 * 
 * $Id: ScrollingListProviderFactory.java 33 2010-08-20 13:40:07Z aha $
 *
 */
public class ScrollingListProviderFactory {

    private DaoSupport dao;

    private Integer initialLoadSize = 10;

    public ScrollingListProvider getScrollingList(FilterDefinition filterProvider)
            throws UnsupportedFilterException {
        Class<?> clazz;
        // Hibernate support
        if (HibernateDaoSupportExtended.class.isAssignableFrom(getDao().getClass())) {
            if (filterProvider instanceof QueryDefinition) {
                clazz = HibernateQueryListProviderImpl.class;
            } else if (filterProvider instanceof HibernateCriteriaDefinition) {
                clazz = HibernateCriteriaListProviderImpl.class;
            } else if (filterProvider instanceof ExampleDefinition) {
                clazz = HibernateExampleListProviderImpl.class;
            } else if (filterProvider instanceof ReloadableAssociation) {
                clazz = HibernateAssociationProvider.class;
                ;
            } else {
                throw new UnsupportedFilterException("The filterProvider class: " + filterProvider.getClass()
                        + " is not supported for Hibernate access");
            }
        } else if ((HibernateDaoSupport.class.isAssignableFrom(getDao().getClass()))) {
            throw new UnsupportedDataProviderException(
                    "For DataAccess via Hibernate the extended version of HibernateSupport is neccessary. "
                            + "Please use HibernateDaoSupportExtended instead of HibernateDaoSupport. "
                            + "If your dao object inherits from HibernateDaoSupport please inherit from HibernateDaoSupportExtended instead");
        }
        // support of other wrappers
        else {
            throw new UnsupportedDataProviderException("This version only supports Hibernate as the dao wrapper.");
        }
        ScrollingListProvider sp = (ScrollingListProvider) BeanUtils.instantiateClass(clazz);
        sp.setDao(dao);
        sp.setLoadSize(initialLoadSize);
        return sp;
    }

    /**
     * @return the dao
     */
    public DaoSupport getDao() {
        return dao;
    }

    /**
     * @param dao the dao to set
     */
    public void setDao(DaoSupport dao) {
        this.dao = dao;
    }

    /**
     * @return the initialLoadSize
     */
    public Integer getInitialLoadSize() {
        return initialLoadSize;
    }

    /**
     * @param initialLoadSize the initialLoadSize to set
     */
    public void setInitialLoadSize(Integer initialLoadSize) {
        this.initialLoadSize = initialLoadSize;
    }

}