collectionidexpr.java

来自「RESIN 3.2 最新源码」· Java 代码 · 共 67 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 Software Foundation, Inc.
 *   59 Temple Place, Suite 330
 *   Boston, MA 02111-1307  USA
 *
 * @author Scott Ferguson
 */

package com.caucho.amber.expr;

import com.caucho.amber.query.FromItem;


/**
 * Bound identifier expression.
 */
public class CollectionIdExpr extends IdExpr {
  private AmberExpr _path;

  /**
   * Creates a new unbound id expression.
   */
  public CollectionIdExpr(FromItem fromItem, AmberExpr path)
  {
    super(fromItem);

    _path = path;
  }

  /**
   * Returns the underlying path.
   */
  AmberExpr getPath()
  {
    return _path;
  }

  /**
   * Returns true if the expression uses the from item.
   */
  public boolean usesFrom(FromItem from, int type, boolean isNot)
  {
    return (getFromItem() == from
	    || getFromItem().getJoinExpr().getJoinTarget() == from);
  }
}