ExpectMarshal.java

/*
 * Copyright (c) 1998-2010 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 Nam Nguyen
 */
package com.caucho.quercus.marshal;

import com.caucho.quercus.env.Env;
import com.caucho.quercus.env.Value;
import com.caucho.quercus.expr.Expr;

public class ExpectMarshal extends Marshal {

   protected enum Type {

      STRING, NUMERIC, BOOLEAN
   }
   private Type _type;
   public static final Marshal MARSHAL_EXPECT_STRING = new ExpectMarshal(Type.STRING);
   public static final Marshal MARSHAL_EXPECT_NUMERIC = new ExpectMarshal(Type.NUMERIC);
   public static final Marshal MARSHAL_EXPECT_BOOLEAN = new ExpectMarshal(Type.BOOLEAN);

   protected ExpectMarshal(Type type) {
      _type = type;
   }

   protected Value expect(Env env, Value value) {
      if (_type == Type.STRING) {
         return env.expectString(value);
      } else if (_type == Type.NUMERIC) {
         return env.expectNumeric(value);
      } else {
         return env.expectBoolean(value);
      }
   }

   @Override
   public boolean isReadOnly() {
      return false;
   }

   /**
    * Return true if is a Value.
    */
   @Override
   public boolean isValue() {
      return true;
   }

   @Override
   public Object marshal(Env env, Expr expr, Class expectedClass) {
      return expect(env, expr.eval(env));
   }

   @Override
   public Object marshal(Env env, Value value, Class expectedClass) {
      return expect(env, value.toValue());
   }

   @Override
   public Value unmarshal(Env env, Object value) {
      return (Value) value;
   }

   @Override
   protected int getMarshalingCostImpl(Value argValue) {
      return Marshal.COST_VALUE;
   }

   @Override
   public Class getExpectedClass() {
      return Value.class;
   }
}