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| org.apache.commons.jexl.parser.ASTMethod | 
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| 1 |  /* | |
| 2 |   * Copyright 2002-2006 The Apache Software Foundation. | |
| 3 |   * | |
| 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; | |
| 17 | ||
| 18 |  import java.lang.reflect.InvocationTargetException; | |
| 19 |  import java.math.BigDecimal; | |
| 20 |  import java.math.BigInteger; | |
| 21 | ||
| 22 |  import org.apache.commons.jexl.JexlContext; | |
| 23 |  import org.apache.commons.jexl.util.Introspector; | |
| 24 |  import org.apache.commons.jexl.util.introspection.VelMethod; | |
| 25 |  import org.apache.commons.jexl.util.introspection.Info; | |
| 26 | ||
| 27 |  /** | |
| 28 |   * Method execution. | |
| 29 |   */ | |
| 30 | public class ASTMethod extends SimpleNode { | |
| 31 |      /** dummy velocity info. */ | |
| 32 | 5 | private static final Info DUMMY = new Info("", 1, 1); | 
| 33 | ||
| 34 |      /** | |
| 35 |       * Create the node given an id. | |
| 36 |       *  | |
| 37 |       * @param id node id. | |
| 38 |       */ | |
| 39 | public ASTMethod(int id) { | |
| 40 | 0 |          super(id); | 
| 41 | 0 |      } | 
| 42 | ||
| 43 |      /** | |
| 44 |       * Create a node with the given parser and id. | |
| 45 |       *  | |
| 46 |       * @param p a parser. | |
| 47 |       * @param id node id. | |
| 48 |       */ | |
| 49 | public ASTMethod(Parser p, int id) { | |
| 50 | 44 |          super(p, id); | 
| 51 | 44 | } | 
| 52 | ||
| 53 |      /** {@inheritDoc} */ | |
| 54 |      public Object jjtAccept(ParserVisitor visitor, Object data) { | |
| 55 | 0 |          return visitor.visit(this, data); | 
| 56 | } | |
| 57 | ||
| 58 |      /** | |
| 59 |       * evaluate a method invocation upon a base object. | |
| 60 |       *  | |
| 61 |       * foo.bar(2) | |
| 62 |       *  | |
| 63 |       * @param jc the {@link JexlContext} to evaluate against. | |
| 64 |       * @param obj The object to have the method invoked. | |
| 65 |       * @return the value of the method invocation. | |
| 66 |       * @throws Exception on any error | |
| 67 |       */ | |
| 68 |      public Object execute(Object obj, JexlContext jc) throws Exception { | |
| 69 | 39 | String methodName = ((ASTIdentifier) jjtGetChild(0)).val; | 
| 70 | ||
| 71 | 39 |          int paramCount = jjtGetNumChildren() - 1; | 
| 72 | ||
| 73 |          /* | |
| 74 |           * get our params | |
| 75 |           */ | |
| 76 | ||
| 77 | 39 |          Object[] params = new Object[paramCount]; | 
| 78 | ||
| 79 |          try { | |
| 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 |              /* | |
| 86 |               * DG: If we can't find an exact match, narrow the parameters and | |
| 87 |               * try again! | |
| 88 |               */ | |
| 89 | 39 | if (vm == null) { | 
| 90 | ||
| 91 |                  // replace all numbers with the smallest type that will fit | |
| 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 | } | |
| 98 | 6 | vm = Introspector.getUberspect().getMethod(obj, methodName, params, DUMMY); | 
| 99 | 6 | if (vm == null) { | 
| 100 | 0 |                      return null; | 
| 101 | } | |
| 102 | } | |
| 103 | ||
| 104 | 39 |              return vm.invoke(obj, params); | 
| 105 |          } catch (InvocationTargetException e) { | |
| 106 | 0 |              Throwable t = e.getTargetException(); | 
| 107 | ||
| 108 | 0 |              if (t instanceof Exception) { | 
| 109 | 0 |                  throw (Exception) t; | 
| 110 | } | |
| 111 | ||
| 112 | 0 |              throw e; | 
| 113 | } | |
| 114 | } | |
| 115 | ||
| 116 |      /** | |
| 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 | |
| 119 |       * method calls, e.g. a call to substring(int,int) with an int and a long | |
| 120 |       * will fail, but a call to substring(int,int) with an int and a short will | |
| 121 |       * succeed. | |
| 122 |       *  | |
| 123 |       * @param original the original number. | |
| 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) { | |
| 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 { | |
| 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 | } | 
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