com.npower.dm.hibernate.FullTextSearchExpression.java Source code

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Here is the source code for com.npower.dm.hibernate.FullTextSearchExpression.java

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/**
 * $Header: /home/master/nWave-DM-Common/src/com/npower/dm/hibernate/FullTextSearchExpression.java,v 1.1 2008/09/03 09:09:07 chenlei Exp $
 * $Revision: 1.1 $
 * $Date: 2008/09/03 09:09:07 $
 *
 * ===============================================================================================
 * License, Version 1.1
 *
 * Copyright (c) 1994-2008 NPower Network Software Ltd.  All rights reserved.
 *
 * This SOURCE CODE FILE, which has been provided by NPower as part
 * of a NPower product for use ONLY by licensed users of the product,
 * includes CONFIDENTIAL and PROPRIETARY information of NPower.
 *
 * USE OF THIS SOFTWARE IS GOVERNED BY THE TERMS AND CONDITIONS
 * OF THE LICENSE STATEMENT AND LIMITED WARRANTY FURNISHED WITH
 * THE PRODUCT.
 *
 * IN PARTICULAR, YOU WILL INDEMNIFY AND HOLD NPower, ITS RELATED
 * COMPANIES AND ITS SUPPLIERS, HARMLESS FROM AND AGAINST ANY CLAIMS
 * OR LIABILITIES ARISING OUT OF THE USE, REPRODUCTION, OR DISTRIBUTION
 * OF YOUR PROGRAMS, INCLUDING ANY CLAIMS OR LIABILITIES ARISING OUT OF
 * OR RESULTING FROM THE USE, MODIFICATION, OR DISTRIBUTION OF PROGRAMS
 * OR FILES CREATED FROM, BASED ON, AND/OR DERIVED FROM THIS SOURCE
 * CODE FILE.
 * ===============================================================================================
 */

package com.npower.dm.hibernate;

import org.hibernate.Criteria;
import org.hibernate.HibernateException;
import org.hibernate.criterion.CriteriaQuery;
import org.hibernate.criterion.Criterion;
import org.hibernate.engine.TypedValue;

/**
 * @author Huang ChunPing
 * @version $Revision: 1.1 $ ${date}04:38:14$ com.npower.help.action
 *          OTAS-DM-Help FullTextSearchExpression.java
 */
public class FullTextSearchExpression implements Criterion {

    /**
     * 
     */
    private static final long serialVersionUID = 1L;

    private final String propertyName;

    private final String value;

    public FullTextSearchExpression(String propertyName, String value) {
        this.propertyName = propertyName;
        this.value = '%' + value + '%';
    }

    public String toSqlString(Criteria criteria, CriteriaQuery criteriaQuery) throws HibernateException {
        String[] columns = criteriaQuery.getColumnsUsingProjection(criteria, propertyName);
        if (columns.length != 1)
            throw new HibernateException("ilike may only be used with single-column properties");
        int index = genIndexId(columns);
        return " contains(" + columns[0] + ", ?, " + index + ")>0";
    }

    /**
     * @param columns
     */
    private int genIndexId(String[] columns) {
        int index = columns[0].hashCode();
        index = (index < 0) ? (Integer.MAX_VALUE + index) : index;
        return index;
    }

    public TypedValue[] getTypedValues(Criteria criteria, CriteriaQuery criteriaQuery) throws HibernateException {
        return new TypedValue[] {
                criteriaQuery.getTypedValue(criteria, propertyName, value.toString().toLowerCase()) };
    }

    public String toString() {
        return " contains(" + propertyName + ", ?, 1)>0";
    }
}