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| org.apache.commons.jexl.parser.ASTMethod |
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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"); |
|
| 5 | * you may not use this file except in compliance with the License. |
|
| 6 | * You may obtain a copy of the License at |
|
| 7 | * |
|
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
|
| 9 | * |
|
| 10 | * Unless required by applicable law or agreed to in writing, software |
|
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
|
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
|
| 13 | * See the License for the specific language governing permissions and |
|
| 14 | * limitations under the License. |
|
| 15 | */ |
|
| 16 | package org.apache.commons.jexl.parser; |
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| 17 | ||
| 18 | import java.lang.reflect.InvocationTargetException; |
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| 19 | import java.math.BigDecimal; |
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| 20 | import java.math.BigInteger; |
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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.VelMethod; |
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| 25 | import org.apache.commons.jexl.util.introspection.Info; |
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| 26 | ||
| 27 | /** |
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| 28 | * Method execution. |
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| 29 | */ |
|
| 30 | public class ASTMethod extends SimpleNode { |
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| 31 | /** dummy velocity info. */ |
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| 32 | 5 | private static final Info DUMMY = new Info("", 1, 1); |
| 33 | ||
| 34 | /** |
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| 35 | * Create the node given an id. |
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| 36 | * |
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| 37 | * @param id node id. |
|
| 38 | */ |
|
| 39 | public ASTMethod(int id) { |
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| 40 | 0 | super(id); |
| 41 | 0 | } |
| 42 | ||
| 43 | /** |
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| 44 | * Create a node with the given parser and id. |
|
| 45 | * |
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| 46 | * @param p a parser. |
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| 47 | * @param id node id. |
|
| 48 | */ |
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| 49 | public ASTMethod(Parser p, int id) { |
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| 50 | 44 | super(p, id); |
| 51 | 44 | } |
| 52 | ||
| 53 | /** {@inheritDoc} */ |
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| 54 | public Object jjtAccept(ParserVisitor visitor, Object data) { |
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| 55 | 0 | return visitor.visit(this, data); |
| 56 | } |
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| 57 | ||
| 58 | /** |
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| 59 | * evaluate a method invocation upon a base object. |
|
| 60 | * |
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| 61 | * foo.bar(2) |
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| 62 | * |
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| 63 | * @param jc the {@link JexlContext} to evaluate against. |
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| 64 | * @param obj The object to have the method invoked. |
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| 65 | * @return the value of the method invocation. |
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| 66 | * @throws Exception on any error |
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| 67 | */ |
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| 68 | public Object execute(Object obj, JexlContext jc) throws Exception { |
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| 69 | 39 | String methodName = ((ASTIdentifier) jjtGetChild(0)).val; |
| 70 | ||
| 71 | 39 | int paramCount = jjtGetNumChildren() - 1; |
| 72 | ||
| 73 | /* |
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| 74 | * get our params |
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| 75 | */ |
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| 76 | ||
| 77 | 39 | Object[] params = new Object[paramCount]; |
| 78 | ||
| 79 | try { |
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| 80 | 71 | for (int i = 0; i < paramCount; i++) { |
| 81 | 32 | params[i] = ((SimpleNode) jjtGetChild(i + 1)).value(jc); |
| 82 | } |
|
| 83 | ||
| 84 | 39 | VelMethod vm = Introspector.getUberspect().getMethod(obj, methodName, params, DUMMY); |
| 85 | /* |
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| 86 | * DG: If we can't find an exact match, narrow the parameters and |
|
| 87 | * try again! |
|
| 88 | */ |
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| 89 | 39 | if (vm == null) { |
| 90 | ||
| 91 | // replace all numbers with the smallest type that will fit |
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| 92 | 16 | for (int i = 0; i < params.length; i++) { |
| 93 | 10 | Object param = params[i]; |
| 94 | 10 | if (param instanceof Number) { |
| 95 | 10 | params[i] = narrow((Number) param); |
| 96 | } |
|
| 97 | } |
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| 98 | 6 | vm = Introspector.getUberspect().getMethod(obj, methodName, params, DUMMY); |
| 99 | 6 | if (vm == null) { |
| 100 | 0 | return null; |
| 101 | } |
|
| 102 | } |
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| 103 | ||
| 104 | 39 | return vm.invoke(obj, params); |
| 105 | } catch (InvocationTargetException e) { |
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| 106 | 0 | Throwable t = e.getTargetException(); |
| 107 | ||
| 108 | 0 | if (t instanceof Exception) { |
| 109 | 0 | throw (Exception) t; |
| 110 | } |
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| 111 | ||
| 112 | 0 | throw e; |
| 113 | } |
|
| 114 | } |
|
| 115 | ||
| 116 | /** |
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| 117 | * Given a Number, return back the value using the smallest type the result |
|
| 118 | * will fit into. This works hand in hand with parameter 'widening' in java |
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| 119 | * method calls, e.g. a call to substring(int,int) with an int and a long |
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| 120 | * will fail, but a call to substring(int,int) with an int and a short will |
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| 121 | * succeed. |
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| 122 | * |
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| 123 | * @param original the original number. |
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| 124 | * @return a value of the smallest type the original number will fit into. |
|
| 125 | * @since 1.1 |
|
| 126 | */ |
|
| 127 | private Number narrow(Number original) { |
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| 128 | 10 | if (original == null || original instanceof BigDecimal || original instanceof BigInteger) { |
| 129 | 0 | return original; |
| 130 | } |
|
| 131 | 10 | Number result = original; |
| 132 | 10 | if (original instanceof Double || original instanceof Float) { |
| 133 | 0 | double value = original.class="keyword">doubleValue(); |
| 134 | 0 | if (value <= Float.MAX_VALUE && value >= Float.MIN_VALUE) { |
| 135 | 0 | result = new Float(result.floatValue()); |
| 136 | } |
|
| 137 | // else it was already a double |
|
| 138 | } else { |
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| 139 | 10 | long value = original.class="keyword">longValue(); |
| 140 | 10 | if (value <= Byte.MAX_VALUE && value >= Byte.MIN_VALUE) { |
| 141 | // it will fit in a byte |
|
| 142 | 10 | result = new Byte((byte) value); |
| 143 | 0 | } else if (value <= Short.MAX_VALUE && value >= Short.MIN_VALUE) { |
| 144 | 0 | result = new Short((short) value); |
| 145 | 0 | } else if (value <= Integer.MAX_VALUE && value >= Integer.MIN_VALUE) { |
| 146 | 0 | result = new Integer((int) value); |
| 147 | } |
|
| 148 | // else it was already a long |
|
| 149 | } |
|
| 150 | 10 | return result; |
| 151 | } |
|
| 152 | ||
| 153 | } |
| This report is generated by jcoverage, Maven and Maven JCoverage Plugin. |