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This Jackrabbit subproject is an object/JCR persistence and query service. This tools lets you to persist java objects into a JCR compliant repository - including association, inheritance, polymorphism, composition, and the Java collections framework. Furthermore, this jcr-mapping allows you to express queries in Java-based Criteria, as well as in JCR query language. It offers also features like version support and object locking.

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/*
 * 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.jackrabbit.ocm.query.impl;

import org.apache.jackrabbit.ocm.mapper.Mapper;
import org.apache.jackrabbit.ocm.mapper.model.ClassDescriptor;
import org.apache.jackrabbit.ocm.query.Filter;
import org.apache.jackrabbit.ocm.query.Query;

/**
 * Default Query implementation
 *
 * @author Christophe Lombart
 *
 */
public class QueryImpl implements Query
{
		
	private Filter filter;
	
    ClassDescriptor classDescriptor;

    private final static String ORDER_BY_STRING =  "order by ";
    
    private String jcrExpression = "";

	/**
	 * Constructor
	 *
	 * @param filter
	 * @param mapper
	 */
	public QueryImpl(Filter filter, Mapper mapper)
	{				
		this.filter = filter;
		classDescriptor = mapper.getClassDescriptorByClass(filter.getFilterClass());
	}

	/**
	 * @see org.apache.jackrabbit.ocm.query.Query#setFilter(org.apache.jackrabbit.ocm.query.Filter)
	 */
	public void setFilter(Filter filter)
	{
		this.filter = filter;
	}

	/**
	 * @see org.apache.jackrabbit.ocm.query.Query#getFilter()
	 */
	public Filter getFilter()
	{
        return this.filter;
	}

	public void addOrderByDescending(String fieldNameAttribute)
	{
		//Changes made to maintain the query state updated with every addition
		//@author Shrirang Edgaonkar
		addExpression("@" + this.getJcrFieldName(fieldNameAttribute) + " descending");
	}

	/**
	 *
	 * @see org.apache.jackrabbit.ocm.query.Query#addOrderByAscending(java.lang.String)
	 */
	public void addOrderByAscending(String fieldNameAttribute)
	{
		addExpression("@" + this.getJcrFieldName(fieldNameAttribute) + " ascending");
	}
	
    public void addJCRExpression(String jcrExpression) {
        addExpression(jcrExpression);
     }
	
	
    private void addExpression(String jcrExpression) {
		 //@author Shrirang Edgaonkar
    	 // First time comma is not required
    	 if(this.jcrExpression.equals(""))
    	 {	
    		 this.jcrExpression += jcrExpression ;
    	 }else
    		 this.jcrExpression += (" , " + jcrExpression) ;
    }

	
    
	public String getOrderByExpression()
	{
		if(jcrExpression.equals(""))
			return "";
		else
		{	
			//@author Shrirang Edgaonkar
			//Ensure that the OrderBy string is added only once
			if(this.jcrExpression.contains(ORDER_BY_STRING))
				return this.jcrExpression;
			else
				return (ORDER_BY_STRING + this.jcrExpression);
		}
	}
	
	
	private String getJcrFieldName(String fieldAttribute)
	{
		
		return classDescriptor.getJcrName(fieldAttribute);
	    	
	}

}