001: /* ====================================================================
002: * Tea - Copyright (c) 1997-2000 Walt Disney Internet Group
003: * ====================================================================
004: * The Tea Software License, Version 1.1
005: *
006: * Copyright (c) 2000 Walt Disney Internet Group. All rights reserved.
007: *
008: * Redistribution and use in source and binary forms, with or without
009: * modification, are permitted provided that the following conditions
010: * are met:
011: *
012: * 1. Redistributions of source code must retain the above copyright
013: * notice, this list of conditions and the following disclaimer.
014: *
015: * 2. Redistributions in binary form must reproduce the above copyright
016: * notice, this list of conditions and the following disclaimer in
017: * the documentation and/or other materials provided with the
018: * distribution.
019: *
020: * 3. The end-user documentation included with the redistribution,
021: * if any, must include the following acknowledgment:
022: * "This product includes software developed by the
023: * Walt Disney Internet Group (http://opensource.go.com/)."
024: * Alternately, this acknowledgment may appear in the software itself,
025: * if and wherever such third-party acknowledgments normally appear.
026: *
027: * 4. The names "Tea", "TeaServlet", "Kettle", "Trove" and "BeanDoc" must
028: * not be used to endorse or promote products derived from this
029: * software without prior written permission. For written
030: * permission, please contact opensource@dig.com.
031: *
032: * 5. Products derived from this software may not be called "Tea",
033: * "TeaServlet", "Kettle" or "Trove", nor may "Tea", "TeaServlet",
034: * "Kettle", "Trove" or "BeanDoc" appear in their name, without prior
035: * written permission of the Walt Disney Internet Group.
036: *
037: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
038: * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
039: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
040: * DISCLAIMED. IN NO EVENT SHALL THE WALT DISNEY INTERNET GROUP OR ITS
041: * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
042: * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
043: * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
044: * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
045: * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
046: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
047: * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
048: * ====================================================================
049: *
050: * For more information about Tea, please see http://opensource.go.com/.
051: */
052:
053: package com.go.tea.parsetree;
054:
055: import com.go.tea.compiler.SourceInfo;
056:
057: /******************************************************************************
058: * A ReturnStatement allows the values of Expressions to be returned from an
059: * execution scope. If the expression is null, then void is returned.
060: *
061: * @author Brian S O'Neill
062: * @version
063: * <!--$$Revision:--> 12 <!-- $-->, <!--$$JustDate:--> 01/05/31 <!-- $-->
064: */
065: public class ReturnStatement extends Statement {
066: private Expression mExpr;
067:
068: public ReturnStatement(SourceInfo info, Expression expr) {
069: super (info);
070: mExpr = expr;
071: }
072:
073: /**
074: * Construct a ReturnStatement from just an expression and its SourceInfo.
075: */
076: public ReturnStatement(Expression expr) {
077: this (expr.getSourceInfo(), expr);
078: }
079:
080: /**
081: * Construct a ReturnStatement that returns void.
082: */
083: public ReturnStatement(SourceInfo info) {
084: this (info, null);
085: }
086:
087: public Object accept(NodeVisitor visitor) {
088: return visitor.visit(this );
089: }
090:
091: public Object clone() {
092: ReturnStatement rs = (ReturnStatement) super .clone();
093: rs.mExpr = (Expression) mExpr.clone();
094: return rs;
095: }
096:
097: public boolean isReturn() {
098: return true;
099: }
100:
101: public boolean isBreak() {
102: return true;
103: }
104:
105: /**
106: * Returns the expression to return or null if void is returned.
107: */
108: public Expression getExpression() {
109: return mExpr;
110: }
111:
112: public void setExpression(Expression expr) {
113: mExpr = expr;
114: }
115: }
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