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| org.apache.commons.jexl.parser.SimpleNode | 
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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 | ||
| 17 |  package org.apache.commons.jexl.parser; | |
| 18 | ||
| 19 |  import org.apache.commons.jexl.JexlContext; | |
| 20 | ||
| 21 |  /** | |
| 22 |   * A Useful implementation of {@link Node}. Mostly autogenerated by javacc | |
| 23 |   *  | |
| 24 |   * @author <a href="mailto:geirm@apache.org">Geir Magnusson Jr.</a> | |
| 25 |   * @version $Id: SimpleNode.java 398328 2006-04-30 12:46:59Z dion $ | |
| 26 |   */ | |
| 27 | public class SimpleNode implements Node { | |
| 28 |      /** parent node. */ | |
| 29 |      protected Node parent; | |
| 30 | ||
| 31 |      /** children of this node. */ | |
| 32 |      protected Node[] children; | |
| 33 | ||
| 34 |      /** id of the node. */ | |
| 35 | protected int id; | |
| 36 | ||
| 37 |      /** parser that created the node. */ | |
| 38 |      protected Parser parser; | |
| 39 | ||
| 40 |      /** | |
| 41 |       * Create the node given an id. | |
| 42 |       *  | |
| 43 |       * @param i node id. | |
| 44 |       */ | |
| 45 | 2434 | public SimpleNode(int i) { | 
| 46 | 2434 | id = i; | 
| 47 | 2434 | } | 
| 48 | ||
| 49 |      /** | |
| 50 |       * Create a node with the given parser and id. | |
| 51 |       *  | |
| 52 |       * @param p a parser. | |
| 53 |       * @param i node id. | |
| 54 |       */ | |
| 55 | public SimpleNode(Parser p, int i) { | |
| 56 | 2434 |          this(i); | 
| 57 | 2434 | parser = p; | 
| 58 | 2434 | } | 
| 59 | ||
| 60 |      /** | |
| 61 |       * Start of the node. | |
| 62 |       */ | |
| 63 | public void jjtOpen() { | |
| 64 | 2434 | } | 
| 65 | ||
| 66 |      /** | |
| 67 |       * End of the node. | |
| 68 |       */ | |
| 69 | public void jjtClose() { | |
| 70 | 2071 | } | 
| 71 | ||
| 72 |      /** {@inheritDoc} */ | |
| 73 | public void jjtSetParent(Node n) { | |
| 74 | 2140 | parent = n; | 
| 75 | 2140 | } | 
| 76 | ||
| 77 |      /** {@inheritDoc} */ | |
| 78 |      public Node jjtGetParent() { | |
| 79 | 0 |          return parent; | 
| 80 | } | |
| 81 | ||
| 82 |      /** {@inheritDoc} */ | |
| 83 | public void jjtAddChild(Node n, int i) { | |
| 84 | 2140 | if (children == null) { | 
| 85 | 1677 |              children = new Node[i + 1]; | 
| 86 | 463 | } else if (i >= children.length) { | 
| 87 | 0 |              Node[] c = new Node[i + 1]; | 
| 88 | 0 |              System.arraycopy(children, 0, c, 0, children.length); | 
| 89 | 0 |              children = c; | 
| 90 | } | |
| 91 | ||
| 92 | 2140 | children[i] = n; | 
| 93 | 2140 | } | 
| 94 | ||
| 95 |      /** {@inheritDoc} */ | |
| 96 | public Node jjtGetChild(int i) { | |
| 97 | 2511 |          return children[i]; | 
| 98 | } | |
| 99 | ||
| 100 |      /** {@inheritDoc} */ | |
| 101 | public int jjtGetNumChildren() { | |
| 102 | 946 | return (children == null) ? 0 : children.length; | 
| 103 | } | |
| 104 | ||
| 105 |      /** | |
| 106 |       * Accept the visitor. | |
| 107 |       *  | |
| 108 |       * @param visitor a {@link ParserVisitor}. | |
| 109 |       * @param data data to be passed along to the visitor. | |
| 110 |       * @return the value from visiting. | |
| 111 |       * @see ParserVisitor#visit | |
| 112 |       */ | |
| 113 |      public Object jjtAccept(ParserVisitor visitor, Object data) { | |
| 114 | 0 |          return visitor.visit(this, data); | 
| 115 | } | |
| 116 | ||
| 117 |      /** | |
| 118 |       * Visit all children. | |
| 119 |       *  | |
| 120 |       * @param visitor a {@link ParserVisitor}. | |
| 121 |       * @param data data to be passed along to the visitor. | |
| 122 |       * @return the value from visiting. | |
| 123 |       * @see ParserVisitor#visit | |
| 124 |       */ | |
| 125 |      public Object childrenAccept(ParserVisitor visitor, Object data) { | |
| 126 | 0 |          if (children != null) { | 
| 127 | 0 |              for (int i = 0; i < children.length; ++i) { | 
| 128 | 0 |                  children[i].jjtAccept(visitor, data); | 
| 129 | } | |
| 130 | } | |
| 131 | 0 |          return data; | 
| 132 | } | |
| 133 | ||
| 134 |      /** | |
| 135 |       * Gets a string representation of the node. | |
| 136 |       * @return the node name. | |
| 137 |       */ | |
| 138 |      public String toString() { | |
| 139 | 0 |          return ParserTreeConstants.jjtNodeName[id]; | 
| 140 | } | |
| 141 | ||
| 142 |      /** | |
| 143 |       * Used during dumping to output the node with a prefix. | |
| 144 |       * @param prefix text to prefix {@link #toString()} | |
| 145 |       * @return text. | |
| 146 |       */ | |
| 147 |      public String toString(String prefix) { | |
| 148 | 0 |          return prefix + toString(); | 
| 149 | } | |
| 150 | ||
| 151 |      /** | |
| 152 |       * Dump the node and all children. | |
| 153 |       * @param prefix text to prefix the node output. | |
| 154 |       */ | |
| 155 | public void dump(String prefix) { | |
| 156 | 0 |          System.out.println(toString(prefix)); | 
| 157 | ||
| 158 | 0 |          if (children != null) { | 
| 159 | 0 |              for (int i = 0; i < children.length; ++i) { | 
| 160 | 0 |                  SimpleNode n = (SimpleNode) children[i]; | 
| 161 | ||
| 162 | 0 |                  if (n != null) { | 
| 163 | 0 |                      n.dump(prefix + " "); | 
| 164 | } | |
| 165 | } | |
| 166 | } | |
| 167 | 0 |      } | 
| 168 | ||
| 169 |      /** | |
| 170 |       * basic interpret - just invoke interpret on all children. | |
| 171 |       * @param pc the {@link JexlContext context} to interpret against. | |
| 172 |       * @return true if interpretation worked. | |
| 173 |       * @throws Exception on any error. | |
| 174 |       */ | |
| 175 | public boolean interpret(JexlContext pc) throws Exception { | |
| 176 | 39 | for (int i = 0; i < jjtGetNumChildren(); i++) { | 
| 177 | 18 | SimpleNode node = (SimpleNode) jjtGetChild(i); | 
| 178 | 18 |              if (!node.interpret(pc)) { | 
| 179 | 0 |                  return false; | 
| 180 | } | |
| 181 | } | |
| 182 | ||
| 183 | 21 | return true; | 
| 184 | } | |
| 185 | ||
| 186 |      /** | |
| 187 |       * Gets the value of this node. | |
| 188 |       *  | |
| 189 |       * @param context the context to retrieve values from. | |
| 190 |       * @return the value of the node. | |
| 191 |       * @throws Exception when evaluating the operands fails. | |
| 192 |       */ | |
| 193 |      public Object value(JexlContext context) throws Exception { | |
| 194 | 0 |          return null; | 
| 195 | } | |
| 196 | ||
| 197 |      /** | |
| 198 |       * Sets the value for the node - again, only makes sense for some nodes but | |
| 199 |       * lazyness tempts me to put it here. Keeps things simple. | |
| 200 |       *  | |
| 201 |       * @param context the context to retrieve values from. | |
| 202 |       * @param value the value. | |
| 203 |       * @return the result. | |
| 204 |       * @throws Exception when evaluating the operands fails. | |
| 205 |       */ | |
| 206 |      public Object setValue(JexlContext context, Object value) throws Exception { | |
| 207 | 0 |          return null; | 
| 208 | } | |
| 209 | ||
| 210 |      /** | |
| 211 |       * Used to let a node calcuate it's value.. | |
| 212 |       * @param o the object to calculate with. | |
| 213 |       * @param ctx the context to retrieve values from. | |
| 214 |       * @throws Exception when calculating the value fails. | |
| 215 |       * @return the result of the calculation. | |
| 216 |       */ | |
| 217 |      public Object execute(Object o, JexlContext ctx) throws Exception { | |
| 218 | 0 |          return null; | 
| 219 | } | |
| 220 | } | 
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