Package java.util.jar

Class Manifest

java.lang.Object
java.util.jar.Manifest
All Implemented Interfaces:
Cloneable
public class Manifest
extends Object
implements Cloneable
The Manifest class is used to obtain attribute information for a JarFile and its entries.

  • Constructor Summary

    Constructors
    Constructor Description
    Manifest()
    Creates a new Manifest instance.
    Manifest​(InputStream is)
    Creates a new Manifest instance using the attributes obtained from the input stream.
    Manifest​(Manifest man)
    Creates a new Manifest instance.

  • Method Summary

    Modifier and Type Method Description
    void clear()
    Resets the both the main attributes as well as the entry attributes associated with this Manifest.
    Object clone()
    Creates a copy of this Manifest.
    boolean equals​(Object o)
    Determines if the receiver is equal to the parameter object.
    Attributes getAttributes​(String name)
    Returns the Attributes associated with the parameter entry name.
    Map<String,​Attributes> getEntries()
    Returns a map containing the Attributes for each entry in the Manifest.
    Attributes getMainAttributes()
    Returns the main Attributes of the JarFile.
    int hashCode()
    Returns the hash code for this instance.
    void read​(InputStream is)
    Merges name/attribute pairs read from the input stream is into this manifest.
    void write​(OutputStream os)
    Writes this Manifest's name/attributes pairs to the given OutputStream.

    Methods inherited from class java.lang.Object

    finalize, getClass, notify, notifyAll, toString, wait, wait, wait

  • Constructor Details

    • Manifest

      public Manifest()
      Creates a new Manifest instance.

    • Manifest

      public Manifest​(InputStream is) throws IOException
      Creates a new Manifest instance using the attributes obtained from the input stream.
      Parameters:
      is - InputStream to parse for attributes.
      Throws:
      IOException - if an IO error occurs while creating this Manifest

    • Manifest

      public Manifest​(Manifest man)
      Creates a new Manifest instance. The new instance will have the same attributes as those found in the parameter Manifest.
      Parameters:
      man - Manifest instance to obtain attributes from.

  • Method Details

    • clear

      public void clear()
      Resets the both the main attributes as well as the entry attributes associated with this Manifest.

    • getAttributes

      public Attributes getAttributes​(String name)
      Returns the Attributes associated with the parameter entry name.
      Parameters:
      name - the name of the entry to obtain Attributes from.
      Returns:
      the Attributes for the entry or null if the entry does not exist.

    • getEntries

      public Map<String,​Attributes> getEntries()
      Returns a map containing the Attributes for each entry in the Manifest.
      Returns:
      the map of entry attributes.

    • getMainAttributes

      public Attributes getMainAttributes()
      Returns the main Attributes of the JarFile.
      Returns:
      main Attributes associated with the source JarFile.

    • clone

      public Object clone()
      Creates a copy of this Manifest. The returned Manifest will equal the Manifest from which it was cloned.
      Overrides:
      clone in class Object
      Returns:
      a copy of this instance.

    • write

      public void write​(OutputStream os) throws IOException
      Writes this Manifest's name/attributes pairs to the given OutputStream. The MANIFEST_VERSION or SIGNATURE_VERSION attribute must be set before calling this method, or no attributes will be written.
      Throws:
      IOException - If an error occurs writing the Manifest.

    • read

      public void read​(InputStream is) throws IOException
      Merges name/attribute pairs read from the input stream is into this manifest.
      Parameters:
      is - The InputStream to read from.
      Throws:
      IOException - If an error occurs reading the manifest.

    • hashCode

      public int hashCode()
      Returns the hash code for this instance.
      Overrides:
      hashCode in class Object
      Returns:
      this Manifest's hashCode.
      See Also:
      Object.equals(java.lang.Object)

    • equals

      public boolean equals​(Object o)
      Determines if the receiver is equal to the parameter object. Two Manifests are equal if they have identical main attributes as well as identical entry attributes.
      Overrides:
      equals in class Object
      Parameters:
      o - the object to compare against.
      Returns:
      true if the manifests are equal, false otherwise
      See Also:
      Object.hashCode()