/*
* 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.quercus.expr;
import com.caucho.quercus.Location;
import com.caucho.quercus.env.Env;
import com.caucho.quercus.env.NullValue;
import com.caucho.quercus.env.QuercusClass;
import com.caucho.quercus.env.Value;
import com.caucho.util.L10N;
/**
* Represents a PHP static field reference.
*/
public class LateStaticBindingFieldGetExpr extends AbstractVarExpr {
private static final L10N L = new L10N(LateStaticBindingFieldGetExpr.class);
protected final String _varName;
public LateStaticBindingFieldGetExpr(Location location, String varName)
{
super(location);
_varName = varName;
}
public LateStaticBindingFieldGetExpr(String varName)
{
_varName = varName;
}
/**
* Evaluates the expression.
*
* @param env the calling environment.
*
* @return the expression value.
*/
public Value eval(Env env)
{
QuercusClass cls = env.getCallingClass();
if (cls == null) {
env.error(getLocation(), L.l("no calling class found"));
return NullValue.NULL;
}
return cls.getStaticField(env, _varName).toValue();
}
/**
* Evaluates the expression as a copy
*
* @param env the calling environment.
*
* @return the expression value.
*/
public Value evalCopy(Env env)
{
QuercusClass cls = env.getCallingClass();
if (cls == null) {
env.error(getLocation(), L.l("no calling class found"));
return NullValue.NULL;
}
return cls.getStaticField(env, _varName).copy();
}
/**
* Evaluates the expression.
*
* @param env the calling environment.
*
* @return the expression value.
*/
@Override
public Value evalArg(Env env, boolean isTop)
{
QuercusClass cls = env.getCallingClass();
if (cls == null) {
env.error(getLocation(), L.l("no calling class found"));
return NullValue.NULL;
}
return cls.getStaticField(env, _varName);
}
/**
* Evaluates the expression, creating an array for unassigned values.
*
* @param env the calling environment.
*
* @return the expression value.
*/
public Value evalArray(Env env)
{
QuercusClass cls = env.getCallingClass();
if (cls == null) {
env.error(getLocation(), L.l("no calling class found"));
return NullValue.NULL;
}
return cls.getStaticField(env, _varName).getArray();
}
/**
* Evaluates the expression, creating an array for unassigned values.
*
* @param env the calling environment.
*
* @return the expression value.
*/
public Value evalObject(Env env)
{
QuercusClass cls = env.getCallingClass();
if (cls == null) {
env.error(getLocation(), L.l("no calling class found"));
return NullValue.NULL;
}
return cls.getStaticField(env, _varName).getObject(env);
}
/**
* Evaluates the expression.
*
* @param env the calling environment.
*
* @return the expression value.
*/
public Value evalRef(Env env)
{
QuercusClass cls = env.getCallingClass();
if (cls == null) {
env.error(getLocation(), L.l("no calling class found"));
return NullValue.NULL;
}
return cls.getStaticField(env, _varName);
}
/**
* Evaluates the expression.
*
* @param env the calling environment.
*
* @return the expression value.
*/
public void evalAssign(Env env, Value value)
{
QuercusClass cls = env.getCallingClass();
if (cls == null) {
env.error(getLocation(), L.l("no calling class found"));
return;
}
cls.getStaticField(env, _varName).set(value);
}
/**
* Evaluates the expression.
*
* @param env the calling environment.
*
* @return the expression value.
*/
public void evalUnset(Env env)
{
env.error(getLocation(),
L.l("{0}::${1}: Cannot unset static variables.",
env.getCallingClass().getName(), _varName));
}
public String toString()
{
return "static::$" + _varName;
}
}