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The mybatis data mapper framework makes it easier to use a relational database with object-oriented applications. mybatis couples objects with stored procedures or SQL statements using a XML descriptor or annotations. Simplicity is the biggest advantage of the mybatis data mapper over object relational mapping tools.

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/*
 * Copyright 2004-2023 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
 *
 *    https://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;

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

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

/**
 * Created by IntelliJ IDEA. User: cbegin Date: May 13, 2005 Time: 11:11:05 PM To change this template use File |
 * Settings | File Templates.
 */
public class Discriminator {

  /** The delegate. */
  private SqlMapExecutorDelegate delegate;

  /** The result mapping. */
  private ResultMapping resultMapping;

  /** The sub maps. */
  private Map subMaps;

  /**
   * Instantiates a new discriminator.
   *
   * @param delegate
   *          the delegate
   * @param resultMapping
   *          the result mapping
   */
  public Discriminator(SqlMapExecutorDelegate delegate, ResultMapping resultMapping) {
    this.delegate = delegate;
    this.resultMapping = resultMapping;
  }

  /**
   * Sets the result mapping.
   *
   * @param resultMapping
   *          the new result mapping
   */
  public void setResultMapping(ResultMapping resultMapping) {
    this.resultMapping = resultMapping;
  }

  /**
   * Gets the result mapping.
   *
   * @return the result mapping
   */
  public ResultMapping getResultMapping() {
    return resultMapping;
  }

  /**
   * Adds the sub map.
   *
   * @param discriminatorValue
   *          the discriminator value
   * @param resultMapName
   *          the result map name
   */
  public void addSubMap(String discriminatorValue, String resultMapName) {
    if (subMaps == null) {
      subMaps = new HashMap();
    }
    subMaps.put(discriminatorValue, resultMapName);
  }

  /**
   * Gets the sub map.
   *
   * @param s
   *          the s
   *
   * @return the sub map
   */
  public ResultMap getSubMap(String s) {
    return (ResultMap) subMaps.get(s);
  }

  /**
   * Bind sub maps.
   */
  public void bindSubMaps() {
    if (subMaps != null) {
      Iterator keys = subMaps.keySet().iterator();
      while (keys.hasNext()) {
        Object key = keys.next();
        Object id = subMaps.get(key);
        if (id instanceof String) {
          subMaps.put(key, delegate.getResultMap((String) id));
        }
      }
    }
  }

}