inselector.java

来自「RESIN 3.2 最新源码」· Java 代码 · 共 69 行

/*
 * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
 *
 * This file is part of Resin(R) Open Source
 *
 * Each copy or derived work must preserve the copyright notice and this
 * notice unmodified.
 *
 * Resin Open Source is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * Resin Open Source is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
 * of NON-INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Resin Open Source; if not, write to the
 *   Free SoftwareFoundation, Inc.
 *   59 Temple Place, Suite 330
 *   Boston, MA 02111-1307  USA
 *
 * @author Scott Ferguson
 */

package com.caucho.jms.selector;

import javax.jms.JMSException;
import javax.jms.Message;
import java.util.HashMap;

/**
 * The base selector.
 */
public class InSelector extends Selector  {
  private Selector _expr;
  
  private HashMap<String,String> _values;

  InSelector(Selector expr)
  {
    _expr = expr;
    _values = new HashMap<String,String>();
  }

  void addValue(String value)
  {
    _values.put(value, value);
  }

  /**
   * Evaluate the message.  The boolean literal selector returns
   * the value of the boolean.
   */
  Object evaluate(Message message)
    throws JMSException
  {
    Object lobj = _expr.evaluate(message);

    if (! (lobj instanceof String))
      return NULL;

    return toBoolean(_values.get(lobj) != null);
  }
}