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


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 package org.objectweb.medor.expression.lib;
24
25 import org.objectweb.jorm.type.api.PTypeSpace;
26 import org.objectweb.jorm.type.api.PType;
27 import org.objectweb.medor.expression.api.Expression;
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.Operator;
32 import org.objectweb.medor.expression.api.ParameterOperand;
33 import org.objectweb.medor.expression.api.TypingException;
34 import org.objectweb.medor.expression.api.UnaryOperator;
35
36 public class Length extends BasicUnaryOperator implements UnaryOperator {
37
38     public Length() {
39     }
40
41     public Length(Expression e) {
42         super(PTypeSpace.INT, e);
43     }
44
45     public Operand evaluate(ParameterOperand[] pos, Object JavaDoc o)
46             throws ExpressionException {
47         try {
48             result.setValue(evaluate(expressions[0].evaluate(pos, o).getString()));
49         } catch (NullPointerException JavaDoc e) {
50             throw new ExpressionException("Unevaluable Expression: Not compiled");
51         }
52         return result;
53     }
54
55     public int evaluate(String JavaDoc op) {
56         return op.length();
57     }
58
59     public Operand compileExpression()
60             throws ExpressionException, MalformedExpressionException {
61         if (expressions[0] != null) {
62             expressions[0].compileExpression();
63             if (expressions[0].getType().getTypeCode() == PType.TYPECODE_STRING) {
64                 result = new BasicVariableOperand(type);
65                 verified = true;
66             } else
67                 throw new TypingException("Attempt a String type");
68         } else
69             //Operands not yet assigned
70 throw new MalformedExpressionException("null childeren value");
71         return result;
72     }
73
74     public String JavaDoc getOperatorString() {
75         return Operator.LENGTH;
76     }
77 }
78
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