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| org.apache.commons.jexl.parser.ASTSizeFunction |
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| 1 | /* |
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| 2 | * Copyright 2002-2004 The Apache Software Foundation. |
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| 3 | * |
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| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
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| 5 | * you may not use this file except in compliance with the License. |
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| 6 | * You may obtain a copy of the License at |
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| 7 | * |
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| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
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| 9 | * |
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| 10 | * Unless required by applicable law or agreed to in writing, software |
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| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
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| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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| 13 | * See the License for the specific language governing permissions and |
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| 14 | * limitations under the License. |
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| 15 | */ |
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| 16 | package org.apache.commons.jexl.parser; |
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| 17 | ||
| 18 | import org.apache.commons.jexl.JexlContext; |
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| 19 | import org.apache.commons.jexl.util.Introspector; |
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| 20 | import org.apache.commons.jexl.util.introspection.Info; |
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| 21 | import org.apache.commons.jexl.util.introspection.VelMethod; |
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| 22 | ||
| 23 | import java.util.List; |
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| 24 | import java.util.Map; |
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| 25 | import java.util.Set; |
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| 26 | import java.lang.reflect.Array; |
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| 27 | ||
| 28 | /** |
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| 29 | * generalized size() function for all classes we can think of |
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| 30 | * |
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| 31 | * @author <a href="mailto:geirm@apache.org">Geir Magnusson Jr.</a> |
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| 32 | * @author <a href="hw@kremvax.net">Mark H. Wilkinson</a> |
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| 33 | * @version $Id: ASTSizeFunction.java,v 1.6 2004/08/15 16:01:12 dion Exp $ |
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| 34 | */ |
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| 35 | public class ASTSizeFunction extends SimpleNode |
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| 36 | { |
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| 37 | public ASTSizeFunction(int id) |
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| 38 | { |
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| 39 | 0 | super(id); |
| 40 | 0 | } |
| 41 | ||
| 42 | public ASTSizeFunction(Parser p, int id) |
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| 43 | { |
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| 44 | 186 | super(p, id); |
| 45 | 186 | } |
| 46 | ||
| 47 | ||
| 48 | /** Accept the visitor. **/ |
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| 49 | public Object jjtAccept(ParserVisitor visitor, Object data) |
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| 50 | { |
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| 51 | 0 | return visitor.visit(this, data); |
| 52 | } |
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| 53 | ||
| 54 | ||
| 55 | public Object value(JexlContext jc) |
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| 56 | throws Exception |
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| 57 | { |
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| 58 | 186 | SimpleNode arg = (SimpleNode) jjtGetChild(0); |
| 59 | ||
| 60 | 186 | Object val = arg.value(jc); |
| 61 | ||
| 62 | 186 | if (val == null) |
| 63 | { |
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| 64 | 0 | throw new Exception("size() : null arg"); |
| 65 | } |
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| 66 | ||
| 67 | 186 | return new Integer(ASTSizeFunction.sizeOf(val)); |
| 68 | } |
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| 69 | ||
| 70 | public static int sizeOf(Object val) |
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| 71 | throws Exception |
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| 72 | { |
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| 73 | 291 | if (val instanceof List) |
| 74 | { |
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| 75 | 105 | return ((List)val).size(); |
| 76 | } |
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| 77 | 186 | else if (val.getClass().isArray()) |
| 78 | { |
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| 79 | 15 | return Array.getLength(val); |
| 80 | } |
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| 81 | 171 | else if (val instanceof Map) |
| 82 | { |
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| 83 | 30 | return ((Map)val).size(); |
| 84 | } |
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| 85 | 141 | else if (val instanceof String) |
| 86 | { |
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| 87 | 81 | return ((String)val).length(); |
| 88 | } |
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| 89 | 60 | else if (val instanceof Set) |
| 90 | { |
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| 91 | 30 | return ((Set)val).size(); |
| 92 | } |
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| 93 | else { |
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| 94 | // check if there is a size method on the object that returns an integer |
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| 95 | // and if so, just use it |
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| 96 | 30 | Object[] params = new Object[0]; |
| 97 | 30 | Info velInfo = new Info("",1,1); |
| 98 | 30 | VelMethod vm = Introspector.getUberspect().getMethod(val, "size", params, velInfo); |
| 99 | 30 | if (vm != null && vm.getReturnType() == Integer.TYPE) |
| 100 | { |
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| 101 | 30 | Integer result = (Integer)vm.invoke(val, params); |
| 102 | 30 | return result.intValue(); |
| 103 | } |
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| 104 | else |
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| 105 | { |
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| 106 | 0 | throw new Exception("size() : unknown type : " + val.getClass()); |
| 107 | } |
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| 108 | } |
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| 109 | } |
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| 110 | ||
| 111 | } |
| This report is generated by jcoverage, Maven and Maven JCoverage Plugin. |