/*

 * reserved comment block

 * DO NOT REMOVE OR ALTER!

 */

package com.sun.org.apache.bcel.internal.classfile;

import  com.sun.org.apache.bcel.internal.Constants;

import  java.io.*;

/**

 * This class is derived from <em>Attribute</em> and represents a reference

 * to the source file of this class.  At most one SourceFile attribute

 * should appear per classfile.  The intention of this class is that it is

 * instantiated from the <em>Attribute.readAttribute()</em> method.

 *

 * @author  <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>

 * @see     Attribute

 */

public final class SourceFile extends Attribute {

  private int sourcefile_index;

  /**

   * Initialize from another object. Note that both objects use the same

   * references (shallow copy). Use clone() for a physical copy.

   */

  public SourceFile(SourceFile c) {

    this(c.getNameIndex(), c.getLength(), c.getSourceFileIndex(),

         c.getConstantPool());

  }

  /**

   * Construct object from file stream.

   * @param name_index Index in constant pool to CONSTANT_Utf8

   * @param length Content length in bytes

   * @param file Input stream

   * @param constant_pool Array of constants

   * @throws IOException

   */

  SourceFile(int name_index, int length, DataInputStream file,

             ConstantPool constant_pool) throws IOException

  {

    this(name_index, length, file.readUnsignedShort(), constant_pool);

  }

  /**

   * @param name_index Index in constant pool to CONSTANT_Utf8, which

   * should represent the string "SourceFile".

   * @param length Content length in bytes, the value should be 2.

   * @param constant_pool The constant pool that this attribute is

   * associated with.

   * @param sourcefile_index Index in constant pool to CONSTANT_Utf8.  This

   * string will be interpreted as the name of the file from which this

   * class was compiled.  It will not be interpreted as indicating the name

   * of the directory contqining the file or an absolute path; this

   * information has to be supplied the consumer of this attribute - in

   * many cases, the JVM.

   */

  public SourceFile(int name_index, int length, int sourcefile_index,

                    ConstantPool constant_pool)

  {

    super(Constants.ATTR_SOURCE_FILE, name_index, length, constant_pool);

    this.sourcefile_index = sourcefile_index;

  }

  /**

   * Called by objects that are traversing the nodes of the tree implicitely

   * defined by the contents of a Java class. I.e., the hierarchy of methods,

   * fields, attributes, etc. spawns a tree of objects.

   *

   * @param v Visitor object

   */

  public void accept(Visitor v) {

    v.visitSourceFile(this);

  }

  /**

   * Dump source file attribute to file stream in binary format.

   *

   * @param file Output file stream

   * @throws IOException

   */

  public final void dump(DataOutputStream file) throws IOException

  {

    super.dump(file);

    file.writeShort(sourcefile_index);

  }

  /**

   * @return Index in constant pool of source file name.

   */

  public final int getSourceFileIndex() { return sourcefile_index; }

  /**

   * @param sourcefile_index.

   */

  public final void setSourceFileIndex(int sourcefile_index) {

    this.sourcefile_index = sourcefile_index;

  }

  /**

   * @return Source file name.

   */

  public final String getSourceFileName() {

    ConstantUtf8 c = (ConstantUtf8)constant_pool.getConstant(sourcefile_index,

                                                             Constants.CONSTANT_Utf8);

    return c.getBytes();

  }

  /**

   * @return String representation

   */

  public final String toString() {

    return "SourceFile(" + getSourceFileName() + ")";

  }

  /**

   * @return deep copy of this attribute

   */

  public Attribute copy(ConstantPool constant_pool) {

    return (SourceFile)clone();

  }

}