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| org.apache.commons.jexl.parser.ASTSizeFunction |
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| 1 | /* |
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| 2 | * Copyright 2002-2006 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 java.lang.reflect.Array; |
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| 19 | import java.util.Collection; |
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| 20 | import java.util.Map; |
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| 21 | ||
| 22 | import org.apache.commons.jexl.JexlContext; |
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| 23 | import org.apache.commons.jexl.util.Introspector; |
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| 24 | import org.apache.commons.jexl.util.introspection.Info; |
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| 25 | import org.apache.commons.jexl.util.introspection.VelMethod; |
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| 26 | ||
| 27 | /** |
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| 28 | * generalized size() function for all classes we can think of. |
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| 29 | * |
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| 30 | * @author <a href="mailto:geirm@apache.org">Geir Magnusson Jr.</a> |
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| 31 | * @author <a href="hw@kremvax.net">Mark H. Wilkinson</a> |
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| 32 | * @version $Id: ASTSizeFunction.java 398324 2006-04-30 12:20:24Z dion $ |
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| 33 | */ |
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| 34 | public class ASTSizeFunction extends SimpleNode { |
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| 35 | /** |
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| 36 | * Create the node given an id. |
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| 37 | * |
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| 38 | * @param id node id. |
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| 39 | */ |
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| 40 | public ASTSizeFunction(int id) { |
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| 41 | 0 | super(id); |
| 42 | 0 | } |
| 43 | ||
| 44 | /** |
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| 45 | * Create a node with the given parser and id. |
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| 46 | * |
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| 47 | * @param p a parser. |
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| 48 | * @param id node id. |
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| 49 | */ |
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| 50 | public ASTSizeFunction(Parser p, int id) { |
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| 51 | 13 | super(p, id); |
| 52 | 13 | } |
| 53 | ||
| 54 | /** {@inheritDoc} */ |
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| 55 | public Object jjtAccept(ParserVisitor visitor, Object data) { |
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| 56 | 0 | return visitor.visit(this, data); |
| 57 | } |
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| 58 | ||
| 59 | /** {@inheritDoc} */ |
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| 60 | public Object value(JexlContext jc) throws Exception { |
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| 61 | 13 | SimpleNode arg = (SimpleNode) jjtGetChild(0); |
| 62 | ||
| 63 | 13 | Object val = arg.value(jc); |
| 64 | ||
| 65 | 13 | if (val == null) { |
| 66 | 0 | throw new Exception("size() : null arg"); |
| 67 | } |
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| 68 | ||
| 69 | 13 | return new Integer(ASTSizeFunction.sizeOf(val)); |
| 70 | } |
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| 71 | ||
| 72 | /** |
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| 73 | * Calculate the <code>size</code> of various types: Collection, Array, Map, String, |
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| 74 | * and anything that has a int size() method. |
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| 75 | * |
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| 76 | * @param val the object to get the size of. |
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| 77 | * @return the size of val |
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| 78 | * @throws Exception if the size cannot be determined. |
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| 79 | */ |
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| 80 | public static int sizeOf(Object val) throws Exception { |
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| 81 | 20 | if (val instanceof Collection) { |
| 82 | 9 | return ((Collection) val).size(); |
| 83 | 11 | } else if (val.getClass().isArray()) { |
| 84 | 1 | return Array.getLength(val); |
| 85 | 10 | } else if (val instanceof Map) { |
| 86 | 2 | return ((Map) val).size(); |
| 87 | 8 | } else if (val instanceof String) { |
| 88 | 6 | return ((String) val).length(); |
| 89 | } else { |
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| 90 | // check if there is a size method on the object that returns an |
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| 91 | // integer |
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| 92 | // and if so, just use it |
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| 93 | 2 | Object[] params = new Object[0]; |
| 94 | 2 | Info velInfo = new Info("", 1, 1); |
| 95 | 2 | VelMethod vm = Introspector.getUberspect().getMethod(val, "size", params, velInfo); |
| 96 | 2 | if (vm != null && vm.getReturnType() == Integer.TYPE) { |
| 97 | 2 | Integer result = (Integer) vm.invoke(val, params); |
| 98 | 2 | return result.intValue(); |
| 99 | } |
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| 100 | 0 | throw new Exception("size() : unknown type : " + val.getClass()); |
| 101 | } |
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| 102 | } |
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| 103 | ||
| 104 | } |
| This report is generated by jcoverage, Maven and Maven JCoverage Plugin. |