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: import com.go.tea.compiler.Type;
057:
058: /******************************************************************************
059: * Base class for all Literals that have a numeric type.
060: *
061: * @author Brian S O'Neill
062: * @version
063: * <!--$$Revision:--> 27 <!-- $-->, <!--$$JustDate:--> 9/07/00 <!-- $-->
064: */
065: public class NumberLiteral extends Literal {
066: private Number mValue;
067:
068: public NumberLiteral(SourceInfo info, Number value) {
069: super (info);
070: if (value == null) {
071: throw new IllegalArgumentException(
072: "NumberLiterals cannot be null");
073: }
074: mValue = value;
075: super .setType(new Type(value.getClass()).toPrimitive());
076: }
077:
078: public NumberLiteral(SourceInfo info, int value) {
079: this (info, new Integer(value));
080: }
081:
082: public NumberLiteral(SourceInfo info, float value) {
083: this (info, new Float(value));
084: }
085:
086: public NumberLiteral(SourceInfo info, long value) {
087: this (info, new Long(value));
088: }
089:
090: public NumberLiteral(SourceInfo info, double value) {
091: this (info, new Double(value));
092: }
093:
094: public Object accept(NodeVisitor visitor) {
095: return visitor.visit(this );
096: }
097:
098: public void convertTo(Type type, boolean preferCast) {
099: if (Number.class.isAssignableFrom(type.getObjectClass())) {
100: if (type.isPrimitive()) {
101: super .setType(type);
102: } else {
103: super .setType(type.toPrimitive());
104: super .convertTo(type.toNonNull(), preferCast);
105: }
106: } else {
107: super .convertTo(type, preferCast);
108: }
109: }
110:
111: public void setType(Type type) {
112: super .setType(type);
113:
114: // NumberLiterals never evaluate to null when the value is known.
115: if (isValueKnown()) {
116: super .setType(getType().toNonNull());
117: }
118: }
119:
120: public Object getValue() {
121: return mValue;
122: }
123:
124: /**
125: * Value is known only if type is a number or can be assigned a number.
126: */
127: public boolean isValueKnown() {
128: Type type = getType();
129: if (type != null) {
130: Class clazz = type.getObjectClass();
131: return Number.class.isAssignableFrom(clazz)
132: || clazz.isAssignableFrom(Number.class);
133: } else {
134: return false;
135: }
136: }
137: }
|