Source Code Cross Referenced for LeExpr.java in  » EJB-Server-resin-3.1.5 » resin » com » caucho » el » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » EJB Server resin 3.1.5 » resin » com.caucho.el 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


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.el;
031:
032:        import com.caucho.vfs.WriteStream;
033:
034:        import javax.el.ELContext;
035:        import javax.el.ELException;
036:        import java.io.IOException;
037:        import java.math.BigDecimal;
038:        import java.math.BigInteger;
039:
040:        /**
041:         * Represents the numeric comparison operation: le
042:         */
043:        public class LeExpr extends AbstractBooleanExpr {
044:            private final Expr _left;
045:            private final Expr _right;
046:
047:            /**
048:             * Creates a comparison expression
049:             *
050:             * @param op the lexical code for the operation
051:             * @param left the left subexpression
052:             * @param right the right subexpression
053:             */
054:            public LeExpr(Expr left, Expr right) {
055:                _left = left;
056:                _right = right;
057:            }
058:
059:            /**
060:             * Returns true if this is a constant expression.
061:             */
062:            @Override
063:            public boolean isConstant() {
064:                return _left.isConstant() && _right.isConstant();
065:            }
066:
067:            /**
068:             * Evaluate the expression as a boolean.
069:             *
070:             * @param env the variable environment
071:             */
072:            @Override
073:            public boolean evalBoolean(ELContext env) throws ELException {
074:                Object aObj = _left.getValue(env);
075:                Object bObj = _right.getValue(env);
076:
077:                if (aObj == bObj)
078:                    return true;
079:
080:                if (aObj == null || bObj == null)
081:                    return false;
082:
083:                Class aType = aObj.getClass();
084:                Class bType = bObj.getClass();
085:
086:                if (aObj instanceof  BigDecimal || bObj instanceof  BigDecimal) {
087:                    BigDecimal a = toBigDecimal(aObj, env);
088:                    BigDecimal b = toBigDecimal(bObj, env);
089:
090:                    return a.compareTo(b) <= 0;
091:                }
092:
093:                if (aType == Double.class || aType == Float.class
094:                        || bType == Double.class || bType == Float.class) {
095:                    double a = toDouble(aObj, env);
096:                    double b = toDouble(bObj, env);
097:
098:                    return a <= b;
099:                }
100:
101:                if (aType == BigInteger.class || bType == BigInteger.class) {
102:                    BigInteger a = toBigInteger(aObj, env);
103:                    BigInteger b = toBigInteger(bObj, env);
104:
105:                    return a.compareTo(b) <= 0;
106:                }
107:
108:                if (aObj instanceof  Number || bObj instanceof  Number) {
109:                    long a = toLong(aObj, env);
110:                    long b = toLong(bObj, env);
111:
112:                    return a <= b;
113:                }
114:
115:                if (aObj instanceof  String || bObj instanceof  String) {
116:                    String a = toString(aObj, env);
117:                    String b = toString(bObj, env);
118:
119:                    return a.compareTo(b) <= 0;
120:                }
121:
122:                if (aObj instanceof  Comparable) {
123:                    int cmp = ((Comparable) aObj).compareTo(bObj);
124:
125:                    return cmp <= 0;
126:                }
127:
128:                if (bObj instanceof  Comparable) {
129:                    int cmp = ((Comparable) bObj).compareTo(aObj);
130:
131:                    return cmp >= 0;
132:                }
133:
134:                ELException e = new ELException(L.l(
135:                        "can't compare {0} and {1}.", aObj, bObj));
136:
137:                error(e, env);
138:
139:                return false;
140:            }
141:
142:            /**
143:             * Prints the code to create an LongLiteral.
144:             */
145:            @Override
146:            public void printCreate(WriteStream os) throws IOException {
147:                os.print("new com.caucho.el.LeExpr(");
148:                _left.printCreate(os);
149:                os.print(", ");
150:                _right.printCreate(os);
151:                os.print(")");
152:            }
153:
154:            /**
155:             * Returns true for equal strings.
156:             */
157:            public boolean equals(Object o) {
158:                if (!(o instanceof  LeExpr))
159:                    return false;
160:
161:                LeExpr expr = (LeExpr) o;
162:
163:                return (_left.equals(expr._left) && _right.equals(expr._right));
164:            }
165:
166:            /**
167:             * Returns a readable representation of the expr.
168:             */
169:            public String toString() {
170:                return "(" + _left + " le " + _right + ")";
171:            }
172:        }
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