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    1   /*
    2    * Copyright 2002,2004 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
    18  package org.apache.commons.jexl.parser;
    19
    20  import org.apache.commons.jexl.JexlContext;
    21
    22  /***
    23   *  Simple identifier -
    24   *     $foo  or $foo.bar (both parts are identifiers...)
    25   *
    26   *  @author <a href="mailto:geirm@apache.org">Geir Magnusson Jr.</a>
    27   *  @version $Id: ASTIdentifier.java,v 1.6 2004/02/28 13:45:20 yoavs Exp $
    28   */
    29  public class ASTIdentifier extends SimpleNode
    30  {
    31      protected String val;
    32
    33      public ASTIdentifier(int id)
    34      {
    35          super(id);
    36      }
    37
    38      public ASTIdentifier(Parser p, int id)
    39      {
    40          super(p, id);
    41      }
    42
    43      /*** Accept the visitor. **/
    44      public Object jjtAccept(ParserVisitor visitor, Object data)
    45      {
    46          return visitor.visit(this, data);
    47      }
    48
    49
    50      public Object value(JexlContext jc)
    51          throws Exception
    52      {
    53          return jc.getVars().get(val);
    54      }
    55
    56      /***
    57       *  returns the value of itself applied to the object.
    58       *   We assume that an identifier can be gotten via a get(String)
    59       */
    60      public Object execute(Object obj, JexlContext jc)
    61          throws Exception
    62      {
    63          return ASTArrayAccess.evaluateExpr(obj, val);
    64      }
    65
    66      public String getIdentifierString()
    67      {
    68          return val;
    69      }
    70  }