PMGClass xref

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    1   /*
    2    * Copyright  2000-2004 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  package org.apache.bcel.classfile;
    18
    19  import java.io.DataInputStream;
    20  import java.io.DataOutputStream;
    21  import java.io.IOException;
    22  import org.apache.bcel.Constants;
    23
    24  /***
    25   * This class is derived from <em>Attribute</em> and represents a reference
    26   * to a PMG attribute.
    27   *
    28   * @version $Id: PMGClass.java 386056 2006-03-15 11:31:56Z tcurdt $
    29   * @author  <A HREF="mailto:m.dahm@gmx.de">M. Dahm</A>
    30   * @see     Attribute
    31   */
    32  public final class PMGClass extends Attribute {
    33
    34      private int pmg_class_index, pmg_index;
    35
    36
    37      /***
    38       * Initialize from another object. Note that both objects use the same
    39       * references (shallow copy). Use clone() for a physical copy.
    40       */
    41      public PMGClass(PMGClass c) {
    42          this(c.getNameIndex(), c.getLength(), c.getPMGIndex(), c.getPMGClassIndex(), c
    43                  .getConstantPool());
    44      }
    45
    46
    47      /***
    48       * Construct object from file stream.
    49       * @param name_index Index in constant pool to CONSTANT_Utf8
    50       * @param length Content length in bytes
    51       * @param file Input stream
    52       * @param constant_pool Array of constants
    53       * @throws IOException
    54       */
    55      PMGClass(int name_index, int length, DataInputStream file, ConstantPool constant_pool)
    56              throws IOException {
    57          this(name_index, length, file.readUnsignedShort(), file.readUnsignedShort(), constant_pool);
    58      }
    59
    60
    61      /***
    62       * @param name_index Index in constant pool to CONSTANT_Utf8
    63       * @param length Content length in bytes
    64       * @param pmg_index index in constant pool for source file name
    65       * @param pmg_class_index Index in constant pool to CONSTANT_Utf8
    66       * @param constant_pool Array of constants
    67       */
    68      public PMGClass(int name_index, int length, int pmg_index, int pmg_class_index,
    69              ConstantPool constant_pool) {
    70          super(Constants.ATTR_PMG, name_index, length, constant_pool);
    71          this.pmg_index = pmg_index;
    72          this.pmg_class_index = pmg_class_index;
    73      }
    74
    75
    76      /***
    77       * Called by objects that are traversing the nodes of the tree implicitely
    78       * defined by the contents of a Java class. I.e., the hierarchy of methods,
    79       * fields, attributes, etc. spawns a tree of objects.
    80       *
    81       * @param v Visitor object
    82       */
    83      public void accept( Visitor v ) {
    84          System.err.println("Visiting non-standard PMGClass object");
    85      }
    86
    87
    88      /***
    89       * Dump source file attribute to file stream in binary format.
    90       *
    91       * @param file Output file stream
    92       * @throws IOException
    93       */
    94      public final void dump( DataOutputStream file ) throws IOException {
    95          super.dump(file);
    96          file.writeShort(pmg_index);
    97          file.writeShort(pmg_class_index);
    98      }
    99
    100
    101     /***
    102      * @return Index in constant pool of source file name.
    103      */
    104     public final int getPMGClassIndex() {
    105         return pmg_class_index;
    106     }
    107
    108
    109     /***
    110      * @param pmg_class_index
    111      */
    112     public final void setPMGClassIndex( int pmg_class_index ) {
    113         this.pmg_class_index = pmg_class_index;
    114     }
    115
    116
    117     /***
    118      * @return Index in constant pool of source file name.
    119      */
    120     public final int getPMGIndex() {
    121         return pmg_index;
    122     }
    123
    124
    125     /***
    126      * @param pmg_index
    127      */
    128     public final void setPMGIndex( int pmg_index ) {
    129         this.pmg_index = pmg_index;
    130     }
    131
    132
    133     /***
    134      * @return PMG name.
    135      */
    136     public final String getPMGName() {
    137         ConstantUtf8 c = (ConstantUtf8) constant_pool.getConstant(pmg_index,
    138                 Constants.CONSTANT_Utf8);
    139         return c.getBytes();
    140     }
    141
    142
    143     /***
    144      * @return PMG class name.
    145      */
    146     public final String getPMGClassName() {
    147         ConstantUtf8 c = (ConstantUtf8) constant_pool.getConstant(pmg_class_index,
    148                 Constants.CONSTANT_Utf8);
    149         return c.getBytes();
    150     }
    151
    152
    153     /***
    154      * @return String representation
    155      */
    156     public final String toString() {
    157         return "PMGClass(" + getPMGName() + ", " + getPMGClassName() + ")";
    158     }
    159
    160
    161     /***
    162      * @return deep copy of this attribute
    163      */
    164     public Attribute copy( ConstantPool _constant_pool ) {
    165         return (PMGClass) clone();
    166     }
    167 }