/*
* 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 Scott Ferguson
*/
package com.caucho.quercus.expr;
import java.io.IOException;
import java.util.ArrayList;
import com.caucho.quercus.Location;
import com.caucho.quercus.env.Env;
import com.caucho.quercus.env.MethodIntern;
import com.caucho.quercus.env.Value;
import com.caucho.quercus.env.StringValue;
import com.caucho.quercus.env.ConstStringValue;
import com.caucho.quercus.env.Var;
import com.caucho.quercus.parser.QuercusParser;
import com.caucho.util.L10N;
/**
* Represents a PHP class field reference A::$foo
*/
public class ClassFieldExpr extends AbstractVarExpr {
private static final L10N L = new L10N(ClassFieldExpr.class);
protected final String _className;
protected final StringValue _varName;
private final StringValue _var;
public ClassFieldExpr(String className, String varName)
{
_className = className;
_varName = MethodIntern.intern(varName);
_var = new ConstStringValue(className + "::" + varName);
}
//
// function call creation
//
/**
* Creates a function call expression
*/
@Override
public Expr createCall(QuercusParser parser,
Location location,
ArrayList<Expr> args)
throws IOException
{
Expr var = parser.createVar(_varName.toString());
ExprFactory factory = parser.getExprFactory();
return factory.createClassMethodCall(location, _className, var, args);
}
/**
* Evaluates the expression.
*
* @param env the calling environment.
*
* @return the expression value.
*/
@Override
public Value eval(Env env)
{
return env.getClass(_className).getStaticFieldValue(env, _varName);
}
/**
* Evaluates the expression.
*
* @param env the calling environment.
*
* @return the expression value.
*/
@Override
public Var evalVar(Env env)
{
return env.getClass(_className).getStaticFieldVar(env, _varName);
}
/**
* Evaluates the expression.
*
* @param env the calling environment.
*
* @return the expression value.
*/
@Override
public Value evalAssignRef(Env env, Value value)
{
env.getClass(_className).setStaticFieldRef(env, _varName, value);
return value;
}
/**
* Evaluates the expression.
*
* @param env the calling environment.
*
* @return the expression value.
*/
@Override
public void evalUnset(Env env)
{
env.error(getLocation(),
L.l("{0}::${1}: Cannot unset static variables.",
_className, _varName));
}
public String toString()
{
return _className + "::$" + _varName;
}
}