org.apache.tools.zip
Class ZipFile

java.lang.Object
  |
  +--org.apache.tools.zip.ZipFile

public class ZipFile
extends java.lang.Object

Replacement for java.util.ZipFile.

This class adds support for file name encodings other than UTF-8 (which is required to work on ZIP files created by native zip tools and is able to skip a preamble like the one found in self extracting archives. Furthermore it returns instances of org.apache.tools.zip.ZipEntry instead of java.util.zip.ZipEntry.

It doesn't extend java.util.zip.ZipFile as it would have to reimplement all methods anyway. Like java.util.ZipFile, it uses RandomAccessFile under the covers and supports compressed and uncompressed entries.

The method signatures mimic the ones of java.util.zip.ZipFile, with a couple of exceptions:


Constructor Summary
ZipFile(java.io.File f)
          Opens the given file for reading, assuming the platform's native encoding for file names.
ZipFile(java.io.File f, java.lang.String encoding)
          Opens the given file for reading, assuming the specified encoding for file names.
ZipFile(java.lang.String name)
          Opens the given file for reading, assuming the platform's native encoding for file names.
ZipFile(java.lang.String name, java.lang.String encoding)
          Opens the given file for reading, assuming the specified encoding for file names.
 
Method Summary
 void close()
          Closes the archive.
protected static java.util.Date fromDosTime(ZipLong l)
          Convert a DOS date/time field to a Date object.
 java.lang.String getEncoding()
          The encoding to use for filenames and the file comment.
 java.util.Enumeration getEntries()
          Returns all entries.
 ZipEntry getEntry(java.lang.String name)
          Returns a named entry - or null if no entry by that name exists.
 java.io.InputStream getInputStream(ZipEntry ze)
          Returns an InputStream for reading the contents of the given entry.
protected  java.lang.String getString(byte[] bytes)
          Retrieve a String from the given bytes using the encoding set for this ZipFile.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

ZipFile

public ZipFile(java.io.File f)
        throws java.io.IOException
Opens the given file for reading, assuming the platform's native encoding for file names.

Parameters:
f - the archive.
Throws:
java.io.IOException - if an error occurs while reading the file.

ZipFile

public ZipFile(java.lang.String name)
        throws java.io.IOException
Opens the given file for reading, assuming the platform's native encoding for file names.

Parameters:
name - name of the archive.
Throws:
java.io.IOException - if an error occurs while reading the file.

ZipFile

public ZipFile(java.lang.String name,
               java.lang.String encoding)
        throws java.io.IOException
Opens the given file for reading, assuming the specified encoding for file names.

Parameters:
name - name of the archive.
encoding - the encoding to use for file names
Throws:
java.io.IOException - if an error occurs while reading the file.

ZipFile

public ZipFile(java.io.File f,
               java.lang.String encoding)
        throws java.io.IOException
Opens the given file for reading, assuming the specified encoding for file names.

Parameters:
f - the archive.
encoding - the encoding to use for file names
Throws:
java.io.IOException - if an error occurs while reading the file.
Method Detail

getEncoding

public java.lang.String getEncoding()
The encoding to use for filenames and the file comment.

Returns:
null if using the platform's default character encoding.

close

public void close()
           throws java.io.IOException
Closes the archive.

Throws:
java.io.IOException - if an error occurs closing the archive.

getEntries

public java.util.Enumeration getEntries()
Returns all entries.

Returns:
all entries as ZipEntry instances

getEntry

public ZipEntry getEntry(java.lang.String name)
Returns a named entry - or null if no entry by that name exists.

Parameters:
name - name of the entry.
Returns:
the ZipEntry corresponding to the given name - or null if not present.

getInputStream

public java.io.InputStream getInputStream(ZipEntry ze)
                                   throws java.io.IOException,
                                          java.util.zip.ZipException
Returns an InputStream for reading the contents of the given entry.

Parameters:
ze - the entry to get the stream for.
Returns:
a stream to read the entry from.
java.io.IOException
java.util.zip.ZipException

fromDosTime

protected static java.util.Date fromDosTime(ZipLong l)
Convert a DOS date/time field to a Date object.

Parameters:
l - contains the stored DOS time.
Returns:
a Date instance corresponding to the given time.

getString

protected java.lang.String getString(byte[] bytes)
                              throws java.util.zip.ZipException
Retrieve a String from the given bytes using the encoding set for this ZipFile.

Parameters:
bytes - the byte array to transform
Returns:
String obtained by using the given encoding
Throws:
java.util.zip.ZipException - if the encoding cannot be recognized.


Copyright 2000-2005 Apache Software Foundation. All Rights Reserved.