package org.apache.bcel.classfile;

/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2001 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Apache" and "Apache Software Foundation" and
 *    "Apache BCEL" must not be used to endorse or promote products
 *    derived from this software without prior written permission. For
 *    written permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache",
 *    "Apache BCEL", nor may "Apache" appear in their name, without
 *    prior written permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

import  org.apache.bcel.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.
 *
 * @version $Id: SourceFile.java,v 1.3 2002/03/11 16:16:35 mdahm Exp $
 * @author  <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
 * @see     Attribute
 */
public final class SourceFile extends Attribute {
  /**
	 * 
	 */
	private static final long serialVersionUID = -7907414874458944663L;
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();
  }
}