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


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.ExpressionException;
29 import org.objectweb.medor.expression.api.MalformedExpressionException;
30 import org.objectweb.medor.expression.api.Operand;
31 import org.objectweb.medor.expression.api.ParameterOperand;
32 import org.objectweb.medor.expression.api.TypingException;
33 import org.objectweb.medor.expression.api.UnaryLogicalOperator;
34 import org.objectweb.medor.expression.api.Expression;
35
36 /**
37  *
38  * @author Sebastien Chassande-Barrioz
39  */
40 public abstract class BasicUnaryLogicalOperator
41         extends BasicUnaryOperator
42         implements UnaryLogicalOperator {
43
44     public BasicUnaryLogicalOperator() {
45         super(PTypeSpace.BOOLEAN);
46     }
47
48     public BasicUnaryLogicalOperator(Expression e) {
49         super(PTypeSpace.BOOLEAN, e);
50     }
51     
52     // IMPLEMENTATION OF THE Expression INTERFACE //
53 //--------------------------------------------//
54
55     public org.objectweb.medor.expression.api.Operand evaluate(ParameterOperand[] pos, Object JavaDoc o)
56             throws ExpressionException {
57         try {
58             result.setValue(expressions[0].evaluate(pos, o).getBoolean());
59         } catch (NullPointerException JavaDoc e) {
60             throw new IllegalStateException JavaDoc("Unevaluable Expression: Not compiled");
61         }
62         return result;
63     }
64
65     public Operand compileExpression()
66         throws ExpressionException, MalformedExpressionException {
67         if (expressions[0] != null) {
68             expressions[0].compileExpression();
69             if (expressions[0].getType().getTypeCode() ==
70                 PType.TYPECODE_BOOLEAN) {
71                 result = new BasicVariableOperand(type);
72                 verified = true;
73             } else
74                 //it is not a boolean type
75 throw new TypingException("Attempt a boolean type");
76         } else
77             //Operands not yet assigned
78 throw new MalformedExpressionException("Null children value");
79         return result;
80     }
81
82     // IMPLEMENTATION OF THE UnaryLogicalOperator INTERFACE //
83 //-------------------------------------------------------//
84
85     public abstract boolean evaluate(boolean boole);
86
87 }
88
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