KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > org > objectweb > medor > expression > lib > BasicBinaryLogicalOperator


1 /**
2  * MEDOR: Middleware Enabling Distributed Object Requests
3  *
4  * Copyright (C) 2001-2003 France Telecom R&D
5  * Contact: alexandre.lefebvre@rd.francetelecom.com
6  *
7  * This library is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * This library is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with this library; if not, write to the Free Software
19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20  *
21  * Initial developers: M. Alia, A. Lefebvre
22  */
23
24 package org.objectweb.medor.expression.lib;
25
26 import org.objectweb.jorm.type.api.PType;
27 import org.objectweb.jorm.type.api.PTypeSpace;
28 import org.objectweb.medor.expression.api.BinaryLogicalOperator;
29 import org.objectweb.medor.expression.api.ExpressionException;
30 import org.objectweb.medor.expression.api.MalformedExpressionException;
31 import org.objectweb.medor.expression.api.Operand;
32 import org.objectweb.medor.expression.api.ParameterOperand;
33 import org.objectweb.medor.expression.api.TypingException;
34 import org.objectweb.medor.expression.api.Expression;
35
36 /**
37  *
38  * @author Sebastien Chassande-Barrioz
39  */
40 public abstract class BasicBinaryLogicalOperator
41         extends BasicBinaryOperator
42         implements BinaryLogicalOperator {
43
44     public BasicBinaryLogicalOperator() {
45         super(PTypeSpace.BOOLEAN);
46     }
47
48     public BasicBinaryLogicalOperator(Expression e0, Expression e1) {
49         super(PTypeSpace.BOOLEAN, e0, e1);
50     }
51     // IMPLEMENTATION OF THE Expression INTERFACE //
52 //--------------------------------------------//
53
54     public org.objectweb.medor.expression.api.Operand evaluate(ParameterOperand[] pos, Object JavaDoc o)
55             throws ExpressionException {
56         try {
57             result.setValue(
58                     evaluate(
59                             expressions[0].evaluate(pos, o).getBoolean(),
60                             expressions[1].evaluate(pos, o).getBoolean()));
61         } catch (NullPointerException JavaDoc e) {
62             throw new IllegalStateException JavaDoc("Unevaluable Expression: Not compiled");
63         }
64         return result;
65     }
66
67     // IMPLEMENTATION OF THE BinaryLogicalOperator INTERFACE //
68 //-------------------------------------------------------//
69
70     public abstract boolean evaluate(boolean b1, boolean b2);
71
72     public Operand compileExpression() throws ExpressionException, MalformedExpressionException {
73         if ((expressions[0] != null) && (expressions[1] != null)) {
74             expressions[0].compileExpression();
75             expressions[1].compileExpression();
76             if (!(expressions[0].getType() == null || expressions[1].getType() == null)) {
77                 if ((expressions[0].getType().getTypeCode() == PType.TYPECODE_BOOLEAN)
78                         &&
79                         (expressions[1].getType().getTypeCode() == PType.TYPECODE_BOOLEAN)) {
80                     result = new BasicVariableOperand(type);
81                     verified = true;
82                 } else
83                     throw new TypingException("Attempt a boolean type"); // it is not a boolean type
84 } else
85                 throw new MalformedExpressionException("null children value");// The childern types are not yet fixed or the expression is malformed
86 } else
87             throw new MalformedExpressionException("null children value");// Operands not yet assigned
88 return result;
89     }
90 }
91
Popular Tags