Package org.apache.commons.compress.archivers

# Class ArchiveStreamFactory

java.lang.Object
org.apache.commons.compress.archivers.ArchiveStreamFactory

All Implemented Interfaces:
  `ArchiveStreamProvider`

public class ArchiveStreamFactory extends Object implements ArchiveStreamProvider
Factory to create Archive[In|Out]putStreams from names or the first bytes of the InputStream. In order to add other implementations, you should extend ArchiveStreamFactory and override the appropriate methods (and call their implementation from super of course). Compressing a ZIP-File:

     final OutputStream out = Files.newOutputStream(output.toPath());
     ArchiveOutputStream os = new ArchiveStreamFactory().createArchiveOutputStream(ArchiveStreamFactory.ZIP, out);

     os.putArchiveEntry(new ZipArchiveEntry("testdata/test1.xml"));
     IOUtils.copy(Files.newInputStream(file1.toPath()), os);
     os.closeArchiveEntry();

     os.putArchiveEntry(new ZipArchiveEntry("testdata/test2.xml"));
     IOUtils.copy(Files.newInputStream(file2.toPath()), os);
     os.closeArchiveEntry();
     os.close();

Decompressing a ZIP-File:

     final InputStream is = Files.newInputStream(input.toPath());
     ArchiveInputStream in = new ArchiveStreamFactory().createArchiveInputStream(ArchiveStreamFactory.ZIP, is);
     ZipArchiveEntry entry = (ZipArchiveEntry) in.getNextEntry();
     OutputStream out = Files.newOutputStream(dir.toPath().resolve(entry.getName()));
     IOUtils.copy(in, out);
     out.close();
     in.close();

This class is immutable
  provided that the deprecated method setEntryEncoding is not used.
This class is thread-safe
  even if the deprecated method setEntryEncoding is used

- ## Field Summary

  Fields
  Modifier and Type
  Field
  Description
  `static final String`
  `APK`
  Constant (value "apk") used to identify the APK archive format.
  `static final String`
  `APKM`
  Constant (value "apkm") used to identify the APKM archive format.
  `static final String`
  `APKS`
  Constant (value "apks") used to identify the APKS archive format.
  `static final String`
  `AR`
  Constant (value "ar") used to identify the AR archive format.
  `static final String`
  `ARJ`
  Constant (value "arj") used to identify the ARJ archive format.
  `static final String`
  `CPIO`
  Constant (value "cpio") used to identify the CPIO archive format.
  `static final ArchiveStreamFactory`
  `DEFAULT`
  The singleton instance using the platform default encoding.
  `static final String`
  `DUMP`
  Constant (value "dump") used to identify the UNIX DUMP archive format.
  `static final String`
  `JAR`
  Constant (value "jar") used to identify the JAR archive format.
  `static final String`
  `SEVEN_Z`
  Constant (value "7z") used to identify the 7z archive format.
  `static final String`
  `TAR`
  Constant used to identify the TAR archive format.
  `static final String`
  `XAPK`
  Constant (value "xapk") used to identify the XAPK archive format.
  `static final String`
  `ZIP`
  Constant (value "zip") used to identify the ZIP archive format.

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `ArchiveStreamFactory()`
  Constructs an instance using the platform default encoding.
  `ArchiveStreamFactory(String entryEncoding)`
  Constructs an instance using the specified encoding.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `<I extends ArchiveInputStream<? extends ArchiveEntry>>
  I`
  `createArchiveInputStream(InputStream in)`
  Creates an archive input stream from an input stream, autodetecting the archive type from the first few bytes of the stream.
  `<I extends ArchiveInputStream<? extends ArchiveEntry>>
  I`
  `createArchiveInputStream(String archiverName, InputStream in)`
  Creates an archive input stream from an archiver name and an input stream.
  `<I extends ArchiveInputStream<? extends ArchiveEntry>>
  I`
  `createArchiveInputStream(String archiverName, InputStream in, String actualEncoding)`
  Creates an archive input stream from an archiver name and an input stream.
  `<O extends ArchiveOutputStream<? extends ArchiveEntry>>
  O`
  `createArchiveOutputStream(String archiverName, OutputStream out)`
  Creates an archive output stream from an archiver name and an output stream.
  `<O extends ArchiveOutputStream<? extends ArchiveEntry>>
  O`
  `createArchiveOutputStream(String archiverName, OutputStream out, String actualEncoding)`
  Creates an archive output stream from an archiver name and an output stream.
  `static String`
  `detect(InputStream in)`
  Try to determine the type of Archiver
  `static SortedMap<String,ArchiveStreamProvider>`
  `findAvailableArchiveInputStreamProviders()`
  Constructs a new sorted map from input stream provider names to provider objects.
  `static SortedMap<String,ArchiveStreamProvider>`
  `findAvailableArchiveOutputStreamProviders()`
  Constructs a new sorted map from output stream provider names to provider objects.
  `SortedMap<String,ArchiveStreamProvider>`
  `getArchiveInputStreamProviders()`
  `SortedMap<String,ArchiveStreamProvider>`
  `getArchiveOutputStreamProviders()`
  `String`
  `getEntryEncoding()`
  Gets the encoding to use for arj, jar, ZIP, dump, cpio and tar files, or null for the archiver default.
  `Set<String>`
  `getInputStreamArchiveNames()`
  Gets all the input stream archive names for this provider
  `Set<String>`
  `getOutputStreamArchiveNames()`
  Gets all the output stream archive names for this provider
  `void`
  `setEntryEncoding(String entryEncoding)`
  Deprecated.
  1.10 use `ArchiveStreamFactory(String)` to specify the encoding

  ### Methods inherited from class java.lang.Object

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

- ## Field Details

  - ### DEFAULT

    public static final ArchiveStreamFactory DEFAULT
    The singleton instance using the platform default encoding.
    Since:
      1.21

  - ### APK

    public static final String APK
    Constant (value "apk") used to identify the APK archive format.

    APK file extensions are .apk, .xapk, .apks, .apkm

    Since:
      1.22
    See Also:
      - Constant Field Values

  - ### XAPK

    public static final String XAPK
    Constant (value "xapk") used to identify the XAPK archive format.

    APK file extensions are .apk, .xapk, .apks, .apkm

    Since:
      1.22
    See Also:
      - Constant Field Values

  - ### APKS

    public static final String APKS
    Constant (value "apks") used to identify the APKS archive format.

    APK file extensions are .apk, .xapk, .apks, .apkm

    Since:
      1.22
    See Also:
      - Constant Field Values

  - ### APKM

    public static final String APKM
    Constant (value "apkm") used to identify the APKM archive format.

    APK file extensions are .apk, .xapk, .apks, .apkm

    Since:
      1.22
    See Also:
      - Constant Field Values

  - ### AR

    public static final String AR
    Constant (value "ar") used to identify the AR archive format.
    Since:
      1.1
    See Also:
      - Constant Field Values

  - ### ARJ

    public static final String ARJ
    Constant (value "arj") used to identify the ARJ archive format. Not supported as an output stream type.
    Since:
      1.6
    See Also:
      - Constant Field Values

  - ### CPIO

    public static final String CPIO
    Constant (value "cpio") used to identify the CPIO archive format.
    Since:
      1.1
    See Also:
      - Constant Field Values

  - ### DUMP

    public static final String DUMP
    Constant (value "dump") used to identify the UNIX DUMP archive format. Not supported as an output stream type.
    Since:
      1.3
    See Also:
      - Constant Field Values

  - ### JAR

    public static final String JAR
    Constant (value "jar") used to identify the JAR archive format.
    Since:
      1.1
    See Also:
      - Constant Field Values

  - ### TAR

    public static final String TAR
    Constant used to identify the TAR archive format.
    Since:
      1.1
    See Also:
      - Constant Field Values

  - ### ZIP

    public static final String ZIP
    Constant (value "zip") used to identify the ZIP archive format.
    Since:
      1.1
    See Also:
      - Constant Field Values

  - ### SEVEN_Z

    public static final String SEVEN_Z
    Constant (value "7z") used to identify the 7z archive format.
    Since:
      1.8
    See Also:
      - Constant Field Values

- ## Constructor Details

  - ### ArchiveStreamFactory

    public ArchiveStreamFactory()
    Constructs an instance using the platform default encoding.

  - ### ArchiveStreamFactory

    public ArchiveStreamFactory(String entryEncoding)
    Constructs an instance using the specified encoding.
    Parameters:
      `entryEncoding` - the encoding to be used.
    Since:
      1.10

- ## Method Details

  - ### detect

    public static String detect(InputStream in) throws ArchiveException
    Try to determine the type of Archiver
    Parameters:
      `in` - input stream
    Returns:
      type of archiver if found
    Throws:
      `ArchiveException` - if an archiver cannot be detected in the stream
    Since:
      1.14

  - ### findAvailableArchiveInputStreamProviders

    public static SortedMap<String,ArchiveStreamProvider> findAvailableArchiveInputStreamProviders()
    Constructs a new sorted map from input stream provider names to provider objects.

    The map returned by this method will have one entry for each provider for which support is available in the current Java virtual machine. If two or more supported provider have the same name then the resulting map will contain just one of them; which one it will contain is not specified.

    The invocation of this method, and the subsequent use of the resulting map, may cause time-consuming disk or network I/O operations to occur. This method is provided for applications that need to enumerate all of the available providers, for example to allow user provider selection.

    This method may return different results at different times if new providers are dynamically made available to the current Java virtual machine.

    Returns:
      An immutable, map from names to provider objects
    Since:
      1.13

  - ### findAvailableArchiveOutputStreamProviders

    public static SortedMap<String,ArchiveStreamProvider> findAvailableArchiveOutputStreamProviders()
    Constructs a new sorted map from output stream provider names to provider objects.

    The map returned by this method will have one entry for each provider for which support is available in the current Java virtual machine. If two or more supported provider have the same name then the resulting map will contain just one of them; which one it will contain is not specified.

    The invocation of this method, and the subsequent use of the resulting map, may cause time-consuming disk or network I/O operations to occur. This method is provided for applications that need to enumerate all of the available providers, for example to allow user provider selection.

    This method may return different results at different times if new providers are dynamically made available to the current Java virtual machine.

    Returns:
      An immutable, map from names to provider objects
    Since:
      1.13

  - ### createArchiveInputStream

    public <I extends ArchiveInputStream<? extends ArchiveEntry>> I createArchiveInputStream(InputStream in) throws ArchiveException
    Creates an archive input stream from an input stream, autodetecting the archive type from the first few bytes of the stream. The InputStream must support marks, like BufferedInputStream.
    Type Parameters:
      `I` - The `ArchiveInputStream` type.
    Parameters:
      `in` - the input stream
    Returns:
      the archive input stream
    Throws:
      `ArchiveException` - if the archiver name is not known
      `StreamingNotSupportedException` - if the format cannot be read from a stream
      `IllegalArgumentException` - if the stream is null or does not support mark

  - ### createArchiveInputStream

    public <I extends ArchiveInputStream<? extends ArchiveEntry>> I createArchiveInputStream(String archiverName, InputStream in) throws ArchiveException
    Creates an archive input stream from an archiver name and an input stream.
    Type Parameters:
      `I` - The `ArchiveInputStream` type.
    Parameters:
      `archiverName` - the archive name, i.e. "ar", "arj", "zip", "tar", "jar", "cpio", "dump" or "7z"
      `in` - the input stream
    Returns:
      the archive input stream
    Throws:
      `ArchiveException` - if the archiver name is not known
      `StreamingNotSupportedException` - if the format cannot be read from a stream
      `IllegalArgumentException` - if the archiver name or stream is null

  - ### createArchiveInputStream

    public <I extends ArchiveInputStream<? extends ArchiveEntry>> I createArchiveInputStream(String archiverName, InputStream in, String actualEncoding) throws ArchiveException
    Description copied from interface: `ArchiveStreamProvider`
    Creates an archive input stream from an archiver name and an input stream.
    Specified by:
      `createArchiveInputStream` in interface `ArchiveStreamProvider`
    Type Parameters:
      `I` - The `ArchiveInputStream` type.
    Parameters:
      `archiverName` - the archiver name, i.e. "ar", "arj", "zip", "tar", "jar", "cpio", "dump" or "7z"
      `in` - the input stream
      `actualEncoding` - encoding name or null for the default
    Returns:
      the archive input stream
    Throws:
      `ArchiveException` - if the archiver name is not known
      `StreamingNotSupportedException` - if the format cannot be read from a stream

  - ### createArchiveOutputStream

    public <O extends ArchiveOutputStream<? extends ArchiveEntry>> O createArchiveOutputStream(String archiverName, OutputStream out) throws ArchiveException
    Creates an archive output stream from an archiver name and an output stream.
    Type Parameters:
      `O` - The `ArchiveOutputStream` type.
    Parameters:
      `archiverName` - the archive name, i.e. "ar", "zip", "tar", "jar" or "cpio"
      `out` - the output stream
    Returns:
      the archive output stream
    Throws:
      `ArchiveException` - if the archiver name is not known
      `StreamingNotSupportedException` - if the format cannot be written to a stream
      `IllegalArgumentException` - if the archiver name or stream is null

  - ### createArchiveOutputStream

    public <O extends ArchiveOutputStream<? extends ArchiveEntry>> O createArchiveOutputStream(String archiverName, OutputStream out, String actualEncoding) throws ArchiveException
    Description copied from interface: `ArchiveStreamProvider`
    Creates an archive output stream from an archiver name and an output stream.
    Specified by:
      `createArchiveOutputStream` in interface `ArchiveStreamProvider`
    Type Parameters:
      `O` - The `ArchiveInputStream` type.
    Parameters:
      `archiverName` - the archiver name, i.e. "ar", "zip", "tar", "jar" or "cpio"
      `out` - the output stream
      `actualEncoding` - encoding name or null for the default
    Returns:
      the archive output stream
    Throws:
      `ArchiveException` - if the archiver name is not known
      `StreamingNotSupportedException` - if the format cannot be written to a stream

  - ### getArchiveInputStreamProviders

    public SortedMap<String,ArchiveStreamProvider> getArchiveInputStreamProviders()

  - ### getArchiveOutputStreamProviders

    public SortedMap<String,ArchiveStreamProvider> getArchiveOutputStreamProviders()

  - ### getEntryEncoding

    public String getEntryEncoding()
    Gets the encoding to use for arj, jar, ZIP, dump, cpio and tar files, or null for the archiver default.
    Returns:
      entry encoding, or null for the archiver default
    Since:
      1.5

  - ### getInputStreamArchiveNames

    public Set<String> getInputStreamArchiveNames()
    Description copied from interface: `ArchiveStreamProvider`
    Gets all the input stream archive names for this provider
    Specified by:
      `getInputStreamArchiveNames` in interface `ArchiveStreamProvider`
    Returns:
      all the input archive names for this provider

  - ### getOutputStreamArchiveNames

    public Set<String> getOutputStreamArchiveNames()
    Description copied from interface: `ArchiveStreamProvider`
    Gets all the output stream archive names for this provider
    Specified by:
      `getOutputStreamArchiveNames` in interface `ArchiveStreamProvider`
    Returns:
      all the output archive names for this provider

  - ### setEntryEncoding

    @Deprecated public void setEntryEncoding(String entryEncoding)
    Deprecated.
    1.10 use `ArchiveStreamFactory(String)` to specify the encoding
    Sets the encoding to use for arj, jar, ZIP, dump, cpio and tar files. Use null for the archiver default.
    Parameters:
      `entryEncoding` - the entry encoding, null uses the archiver default.
    Since:
      1.5