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    1   /*
    2    $Id: AttributeExpression.java,v 1.5 2006/01/19 00:06:51 blackdrag 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 java.lang.reflect.Field;
    49  import java.lang.reflect.Method;
    50
    51  import org.codehaus.groovy.ast.GroovyCodeVisitor;
    52
    53
    54  /***
    55   * Represents an attribute access (accessing the field of a class) such as the expression "foo.@bar".
    56   *
    57   * @author <a href="mailto:james@coredevelopers.net">James Strachan</a>
    58   * @version $Revision: 1.5 $
    59   */
    60  public class AttributeExpression extends Expression {
    61
    62      private Expression objectExpression;
    63      private String property;
    64      private boolean spreadSafe = false;
    65      private boolean safe = false;
    66      private boolean isStatic = false;
    67
    68      private Method getter = null;
    69      private Method setter = null;
    70
    71      private Field field = null;
    72      private int access = -1;
    73
    74      public boolean isStatic() {
    75          return isStatic;
    76      }
    77
    78      public AttributeExpression(Expression objectExpression, String property) {
    79          this(objectExpression, property, false);
    80      }
    81
    82      public AttributeExpression(Expression objectExpression, String property, boolean safe) {
    83          this.objectExpression = objectExpression;
    84          this.property = property;
    85          this.safe = safe;
    86      }
    87
    88      public void visit(GroovyCodeVisitor visitor) {
    89          visitor.visitAttributeExpression(this);
    90      }
    91
    92      public Expression transformExpression(ExpressionTransformer transformer) {
    93          Expression ret = new AttributeExpression(transformer.transform(objectExpression),property,safe);
    94          ret.setSourcePosition(this);
    95          return ret;
    96      }
    97
    98      public Expression getObjectExpression() {
    99          return objectExpression;
    100     }
    101
    102     public String getProperty() {
    103         return property;
    104     }
    105
    106     public String getText() {
    107         return objectExpression.getText() + "." + property;
    108     }
    109
    110     /***
    111      * @return is this a safe navigation, i.e. if true then if the source object is null
    112      * then this navigation will return null
    113      */
    114     public boolean isSafe() {
    115         return safe;
    116     }
    117
    118     public boolean isSpreadSafe() {
    119         return spreadSafe;
    120     }
    121
    122     public void setSpreadSafe(boolean value) {
    123         spreadSafe = value;
    124     }
    125
    126     public String toString() {
    127         return super.toString() + "[object: " + objectExpression + " property: " + property + "]";
    128     }
    129
    130     public void setStatic(boolean aStatic) {
    131         this.isStatic = aStatic;
    132     }
    133
    134     public Method getGetter() {
    135         return getter;
    136     }
    137
    138     public Method getSetter() {
    139         return setter;
    140     }
    141
    142     public Field getField() {
    143         return field;
    144     }
    145
    146     public void setAccess(int access) {
    147         this.access = access;
    148     }
    149
    150     public int getAccess() {
    151         return access;
    152     }
    153 }