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com.jguild.jrpm.io
Class Header  

java.lang.Object
  com.jguild.jrpm.io.Header

Direct Known Subclasses:

RPMHeader, RPMSignature

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public abstract class Header

extends java.lang.Object

This class represents the abstract definition of a header structur. It can be either a signature or a header. The tags of such a structure can be accessed by either their tag id or by their tag name. Also all available and all read tag names in this structure can be accessed.

Version:

$Id: Header.java,v 1.8 2003/10/20 16:32:11 mkuss Exp $

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Field Summary
private static int	HEADER_LENGTH
private  long	indexDataSize
private  IndexEntry[]	indexes
private  long	indexNumber
private static org.apache.log4j.Logger	logger
protected  long	size
private  java.util.HashMap	store
private  int	version

 

Constructor Summary

Header(java.io.DataInputStream inputStream)           Construct a header structure for the given input stream.

 

Method Summary
private static void	check(boolean test)           Asserts a boolean value and throws an exception if it is false
static java.lang.String[]	getKnownTagNames()           Read all known tag names for this header structure.
long	getSize()           Get the size in bytes of this structure
com.jguild.jrpm.io.datatype.DataTypeIf	getTag(long tag)           Get a tag by id as a long
com.jguild.jrpm.io.datatype.DataTypeIf	getTag(java.lang.Long tag)           Get a tag by id as a Long
com.jguild.jrpm.io.datatype.DataTypeIf	getTag(java.lang.String tagname)           Get a tag by name
abstract  long	getTagIdForName(java.lang.String tagname)           Read a tag with a given tag name.
long[]	getTagIds()           Get all tag ids contained in this rpm file.
abstract  java.lang.String	getTagNameForId(long tagid)           Read a tag with a given tag id.
java.lang.String[]	getTagNames()           Get all tag names contained in this rpm file.

 

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

 

Field Detail

HEADER_LENGTH

private static final int HEADER_LENGTH

See Also:

Constant Field Values

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logger

private static final org.apache.log4j.Logger logger

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size

protected long size

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store

private java.util.HashMap store

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indexes

private IndexEntry[] indexes

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version

private int version

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indexDataSize

private long indexDataSize

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indexNumber

private long indexNumber

Constructor Detail

Header

public Header(java.io.DataInputStream inputStream)
       throws java.io.IOException

Construct a header structure for the given input stream. The header structure of a signature or a header can be read and also the index entries containig the tags for this rpm section (signature or header). First a header is read consisting of the following fields:

 byte magic[3];      (3  byte)  (8e ad e8)
 int version;        (1  byte)
 byte reserved[4];   (4  byte)
 long num_index;     (4  byte)
 long num_data;      (4  byte)
 

Afterwareds the index entries are read and then the tags and the correspondig data entries are read.

Method Detail

getKnownTagNames

public static java.lang.String[] getKnownTagNames()

Read all known tag names for this header structure.

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getSize

public long getSize()

Get the size in bytes of this structure

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getTag

public com.jguild.jrpm.io.datatype.DataTypeIf getTag(java.lang.Long tag)

Get a tag by id as a Long

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getTag

public com.jguild.jrpm.io.datatype.DataTypeIf getTag(long tag)

Get a tag by id as a long

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getTag

public com.jguild.jrpm.io.datatype.DataTypeIf getTag(java.lang.String tagname)

Get a tag by name

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getTagIdForName

public abstract long getTagIdForName(java.lang.String tagname)

Read a tag with a given tag name. The tag will be read out of the class defined in getTagEnum().

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getTagIds

public long[] getTagIds()

Get all tag ids contained in this rpm file.

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getTagNameForId

public abstract java.lang.String getTagNameForId(long tagid)

Read a tag with a given tag id. The tag will be read out of the class defined in getTagEnum().

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getTagNames

public java.lang.String[] getTagNames()

Get all tag names contained in this rpm file.

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check

private static final void check(boolean test)
                         throws java.io.IOException

Asserts a boolean value and throws an exception if it is false

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