com.ibatis.sqlmap.engine.mapping.result.loader.ResultLoader Maven / Gradle / Ivy

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The jBATIS persistence framework will help you to significantly reduce the amount of Java code that you normally need to access a relational database. iBATIS simply maps JavaBeans to SQL statements using a very simple XML descriptor.

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/*
 *  Copyright 2004 Clinton Begin
 *
 *  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 com.ibatis.sqlmap.engine.mapping.result.loader;

import java.lang.reflect.Array;
import java.sql.SQLException;
import java.util.Collection;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;

import com.ibatis.sqlmap.engine.impl.SqlMapClientImpl;

/**
 * Class to load results into objects
 */
public class ResultLoader {

    private ResultLoader() {
    }

    /**
     * Loads a result lazily
     *
     * @param client
     *            - the client creating the object
     * @param statementName
     *            - the name of the statement to be used
     * @param parameterObject
     *            - the parameters for the statement
     * @param targetType
     *            - the target type of the result
     * @return the loaded result
     * @throws SQLException
     */
    public static Object loadResult(SqlMapClientImpl client, String statementName, Object parameterObject,
        Class targetType) throws SQLException {
        Object value = null;

        if (client.isLazyLoadingEnabled()) {
            LazyResultLoader lazy = new LazyResultLoader(client, statementName, parameterObject, targetType);
            value = lazy.loadResult();
        } else {
            value = getResult(client, statementName, parameterObject, targetType);
        }

        return value;
    }

    protected static Object getResult(SqlMapClientImpl client, String statementName, Object parameterObject,
        Class targetType) throws SQLException {
        Object value = null;
        if (Set.class.isAssignableFrom(targetType)) {
            value = new LinkedHashSet