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    1   /*
    2    $Id: VariableExpression.java,v 1.6 2004/07/10 03:31:37 bran Exp $
    3
    4    Copyright 2003 (C) James Strachan and Bob Mcwhirter. All Rights Reserved.
    5
    6    Redistribution and use of this software and associated documentation
    7    ("Software"), with or without modification, are permitted provided
    8    that the following conditions are met:
    9
    10   1. Redistributions of source code must retain copyright
    11      statements and notices.  Redistributions must also contain a
    12      copy of this document.
    13
    14   2. Redistributions in binary form must reproduce the
    15      above copyright notice, this list of conditions and the
    16      following disclaimer in the documentation and/or other
    17      materials provided with the distribution.
    18
    19   3. The name "groovy" must not be used to endorse or promote
    20      products derived from this Software without prior written
    21      permission of The Codehaus.  For written permission,
    22      please contact info@codehaus.org.
    23
    24   4. Products derived from this Software may not be called "groovy"
    25      nor may "groovy" appear in their names without prior written
    26      permission of The Codehaus. "groovy" is a registered
    27      trademark of The Codehaus.
    28
    29   5. Due credit should be given to The Codehaus -
    30      http://groovy.codehaus.org/
    31
    32   THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS
    33   ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
    34   NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
    35   FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
    36   THE CODEHAUS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
    37   INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
    38   (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
    39   SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
    40   HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
    41   STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
    42   ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
    43   OF THE POSSIBILITY OF SUCH DAMAGE.
    44
    45   */
    46  package org.codehaus.groovy.ast.expr;
    47
    48  import org.codehaus.groovy.ast.GroovyCodeVisitor;
    49  import org.codehaus.groovy.classgen.AsmClassGenerator2;
    50  import org.codehaus.groovy.classgen.BytecodeHelper;
    51
    52
    53  /***
    54   * Represents a local variable name, the simplest form of expression. e.g. "foo".
    55   *
    56   * @author <a href="mailto:james@coredevelopers.net">James Strachan</a>
    57   * @version $Revision: 1.6 $
    58   */
    59  public class VariableExpression extends Expression {
    60
    61      public static final VariableExpression THIS_EXPRESSION = new VariableExpression("this", null);
    62
    63      private String variable;
    64
    65      public VariableExpression(String variable, String type) {
    66          this.variable = variable;
    67          if (type == null || type.length() == 0) {
    68              isDynamic = true;
    69          }
    70          else {
    71              String boxedType = BytecodeHelper.getObjectTypeForPrimitive(type);
    72              boxedType = BytecodeHelper.getObjectArrayTypeForPrimitiveArray(boxedType);
    73
    74              super.setType(boxedType);  // todo delay setting until resolve()
    75              isDynamic = false;
    76          }
    77      }
    78
    79      public VariableExpression(String variable) {
    80          this.variable = variable;
    81      }
    82
    83      public void visit(GroovyCodeVisitor visitor) {
    84          visitor.visitVariableExpression(this);
    85      }
    86
    87      public Expression transformExpression(ExpressionTransformer transformer) {
    88          return this;
    89      }
    90
    91      protected void resolveType(AsmClassGenerator2 resolver) {
    92          resolver.resolve(this);
    93      }
    94
    95      public String getVariable() {
    96          return variable;
    97      }
    98
    99      public String getText() {
    100         return variable;
    101     }
    102
    103     public String getType() {
    104         if (type == null) {
    105             return "java.lang.Object";
    106         }
    107         return type;
    108     }
    109
    110     boolean isDynamic = true;
    111     public boolean isDynamic() {
    112         return isDynamic;
    113     }
    114
    115     /***
    116      * @return true if this variable is dynamically typed
    117      */
    118
    119     public String toString() {
    120         return super.toString() + "[variable: " + variable + ((isDynamic()) ? "" : " type: " + type) + "]";
    121     }
    122
    123     public void setDynamic(boolean dynamic) {
    124         isDynamic = dynamic;
    125     }
    126 }