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 statement that catches instances of Exception, calls
059: * ThreadGroup.uncaughtException, and moves on. This statement is inserted
060: * by a TypeChecker, and does not appear directly in Tea templates.
061: *
062: * @author Brian S O'Neill
063: * @version
064: * <!--$$Revision:--> 4 <!-- $-->, <!--$$JustDate:--> 01/05/31 <!-- $-->
065: */
066: public class ExceptionGuardStatement extends Statement {
067: private Statement mGuarded;
068: private Statement mReplacement;
069:
070: /**
071: * @param guarded Statement to guard.
072: * @param replacement Optional Statement to execute in catch handler.
073: */
074: public ExceptionGuardStatement(Statement guarded,
075: Statement replacement) {
076: this (guarded.getSourceInfo(), guarded, replacement);
077: }
078:
079: /**
080: * @param guarded Statement to guard.
081: * @param replacement Optional Statement to execute in catch handler.
082: */
083: public ExceptionGuardStatement(SourceInfo info, Statement guarded,
084: Statement replacement) {
085: super (info);
086: mGuarded = guarded;
087: mReplacement = replacement;
088: }
089:
090: public Object accept(NodeVisitor visitor) {
091: return visitor.visit(this );
092: }
093:
094: public Object clone() {
095: ExceptionGuardStatement egs = (ExceptionGuardStatement) super
096: .clone();
097: egs.mGuarded = (Statement) mGuarded.clone();
098: if (mReplacement != null) {
099: egs.mReplacement = (Statement) mReplacement.clone();
100: }
101: return egs;
102: }
103:
104: public boolean isReturn() {
105: return mGuarded != null && mGuarded.isReturn()
106: && mReplacement != null && mReplacement.isReturn();
107: }
108:
109: public boolean isBreak() {
110: return mGuarded != null && mGuarded.isBreak()
111: && mReplacement != null && mReplacement.isBreak();
112: }
113:
114: /**
115: * May return null if removed.
116: */
117: public Statement getGuarded() {
118: return mGuarded;
119: }
120:
121: /**
122: * May return null since this is optional.
123: */
124: public Statement getReplacement() {
125: return mReplacement;
126: }
127:
128: public void setGuarded(Statement guarded) {
129: mGuarded = guarded;
130: }
131:
132: public void setReplacement(Statement replacement) {
133: mReplacement = replacement;
134: }
135: }
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