001: /*
002: * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
003: *
004: * This file is part of Resin(R) Open Source
005: *
006: * Each copy or derived work must preserve the copyright notice and this
007: * notice unmodified.
008: *
009: * Resin Open Source is free software; you can redistribute it and/or modify
010: * it under the terms of the GNU General Public License as published by
011: * the Free Software Foundation; either version 2 of the License, or
012: * (at your option) any later version.
013: *
014: * Resin Open Source is distributed in the hope that it will be useful,
015: * but WITHOUT ANY WARRANTY; without even the implied warranty of
016: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
017: * of NON-INFRINGEMENT. See the GNU General Public License for more
018: * details.
019: *
020: * You should have received a copy of the GNU General Public License
021: * along with Resin Open Source; if not, write to the
022: *
023: * Free Software Foundation, Inc.
024: * 59 Temple Place, Suite 330
025: * Boston, MA 02111-1307 USA
026: *
027: * @author Scott Ferguson
028: */
029:
030: package com.caucho.quercus.expr;
031:
032: import com.caucho.quercus.Location;
033: import com.caucho.quercus.env.Env;
034: import com.caucho.quercus.env.StringValue;
035: import com.caucho.quercus.env.StringBuilderValue;
036: import com.caucho.quercus.env.Value;
037:
038: /**
039: * Represents a PHP string literal expression.
040: */
041: public class StringLiteralExpr extends Expr {
042: protected final StringValue _value;
043:
044: public StringLiteralExpr(Location location, String value) {
045: super (location);
046:
047: _value = new StringBuilderValue(value);
048: }
049:
050: public StringLiteralExpr(Location location, StringValue value) {
051: super (location);
052: _value = value;
053: }
054:
055: public StringLiteralExpr(String value) {
056: this (Location.UNKNOWN, value);
057: }
058:
059: public StringLiteralExpr(StringValue value) {
060: this (Location.UNKNOWN, value);
061: }
062:
063: /**
064: * Returns true for a literal expression.
065: */
066: public boolean isLiteral() {
067: return true;
068: }
069:
070: /**
071: * Evaluates the expression as a constant.
072: *
073: * @return the expression value.
074: */
075: public Value evalConstant() {
076: return _value;
077: }
078:
079: /**
080: * Evaluates the expression.
081: *
082: * @param env the calling environment.
083: *
084: * @return the expression value.
085: */
086: public Value eval(Env env) {
087: return _value;
088: }
089:
090: /**
091: * Evaluates the expression as a string value.
092: *
093: * @param env the calling environment.
094: *
095: * @return the expression value.
096: */
097: @Override
098: public StringValue evalStringValue(Env env) {
099: return _value;
100: }
101:
102: public String toString() {
103: return "\"" + _value + "\"";
104: }
105: }
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