packageexpr.java

RESIN 3.2 最新源码

/*
 * Copyright (c) 1998-2006 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.es.parser;

import com.caucho.es.ESException;
import com.caucho.es.ESId;
import com.caucho.server.util.CauchoSystem;

import java.io.IOException;
import java.lang.reflect.Modifier;

/**
 * Expression representing a Java package, i.e. a partial class.
 */
class PackageExpr extends Expr {
  private Expr rawExpr;
  private String name;

  private PackageExpr(Block block, Expr rawExpr, String name)
  {
    super(block);

    this.rawExpr = rawExpr;
    this.name = name;
  }

  PackageExpr(Block block)
  {
    super(block);

    this.rawExpr = block.newVar(ESId.intern("Packages"));
    this.name = null;
  }

  static Expr create(Block block, Expr rawExpr, String name)
  {
    ClassLoader loader = block.getClassLoader();

    try {
      Class cl;

      cl = CauchoSystem.loadClass(name, false, loader);

      if (Modifier.isPublic(cl.getModifiers()))
        return new JavaClassExpr(block, cl);
    } catch (Throwable e) {
    }

    return new PackageExpr(block, rawExpr, name);
  }

  void setType(int type)
  {
  }

  int getType()
  {
    return TYPE_ES;
  }

  Expr getTypeExpr()
  {
    return null;
  }
  
  Expr fieldReference(ESId id)
    throws ESException
  {
    String newName = null;
    
    if (name == null)
      newName = id.toString();
    else
      newName = name + "." + id.toString();

    return PackageExpr.create(block, rawExpr.fieldReference(id), newName);
  }
  
  Expr fieldReference(Expr expr)
  {
    return rawExpr.fieldReference(expr);
  }

  CallExpr startCall()
    throws ESException
  {
    return rawExpr.startCall();
  }

  CallExpr startNew()
    throws ESException
  {
    return rawExpr.startNew();
  }

  void printImpl() throws IOException
  {
    rawExpr.printImpl();
  }
}