org.brushingbits.jnap.persistence.hibernate.QueryUtils.java Source code

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Here is the source code for org.brushingbits.jnap.persistence.hibernate.QueryUtils.java

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/*
 * QueryUtils.java created on 2011-01-23
 *
 * Created by Brushing Bits Labs
 * http://www.brushingbits.org
 *
 * 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.brushingbits.jnap.persistence.hibernate;

import java.util.Collection;
import java.util.Map;

import org.hibernate.Query;

/**
 * General Hibernate {@link Query} utilities.
 * 
 * @author Daniel Rochetti
 * @since 1.0
 */
public final class QueryUtils {

    /**
     * This is a helper class and should not be directly instantiated.
     */
    private QueryUtils() {
    }

    /**
     * 
     * @param query
     * @param params
     */
    public static void setIndexedParameters(Query query, Object[] params) {
        if (params != null && params.length > 0) {
            for (int i = 0; i < params.length; i++) {
                query.setParameter(i, params[i]);
            }
        }
    }

    /**
     * 
     * @param query
     * @param params
     */
    public static void setNamedParameters(Query query, Map<String, ?> params) {
        if (params != null && !params.isEmpty()) {
            for (String name : params.keySet()) {
                Object paramValue = params.get(name);
                if (Collection.class.isAssignableFrom(paramValue.getClass())) {
                    query.setParameterList(name, (Collection) paramValue);
                } else if (paramValue.getClass().isArray()) {
                    query.setParameterList(name, (Object[]) paramValue);
                } else {
                    query.setParameter(name, paramValue);
                }
            }
        }
    }

    public static void setParameters(Query query, Object params) {
        if (params != null) {
            // testing if the query is using 'Named Parameters' or 'Indexed Parameters'
            if (params.getClass().isArray()) {
                QueryUtils.setIndexedParameters(query, (Object[]) params);
            } else if (params.getClass().isAssignableFrom(Map.class)) {
                QueryUtils.setNamedParameters(query, (Map<String, ?>) params);
            }
        }
    }

}