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## rice.p2p.past
Class ContentHashPastContent

    java.lang.Object
      rice.p2p.past.ContentHashPastContent

All Implemented Interfaces:
  PastContent, java.io.Serializable

public abstract class ContentHashPastContent
extends java.lang.Object
implements PastContent

Version:
  $Id: ContentHashPastContent.java,v 1.7 2005/03/11 00:58:03 jeffh Exp $
Author:
  Peter Druschel, Alan Mislove
See Also:
  Serialized Form

Field Summary
`protected Id` | `myId` DESCRIBE THE FIELD

Constructor Summary
`ContentHashPastContent()`

Method Summary
`PastContent` | `checkInsert(Id id, PastContent existingContent)` Checks if a insert operation should be allowed.
`PastContentHandle` | `getHandle(Past local)` Produces a handle for this content object.
`Id` | `getId()` Returns the Id under which this object is stored in Past.
`boolean` | `isMutable()` States if this content object is mutable.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### myId

    protected Id myId

  DESCRIBE THE FIELD

Constructor Detail

### ContentHashPastContent

    public ContentHashPastContent()

Method Detail

### getHandle

    public PastContentHandle getHandle(Past local)

  Produces a handle for this content object. The handle is retrieved and returned to the client as a result of the Past.lookupHandles() method.

  Specified by:
    `getHandle` in interface `PastContent`
  Parameters:
    `local` - The local past service
  Returns:
    the handle

### getId

    public Id getId()

  Returns the Id under which this object is stored in Past.

  Specified by:
    `getId` in interface `PastContent`
  Returns:
    the id

### isMutable

    public boolean isMutable()

  States if this content object is mutable. Mutable objects are not subject to dynamic caching in Past.

  Specified by:
    `isMutable` in interface `PastContent`
  Returns:
    true if this object is mutable, else false

### checkInsert

    public PastContent checkInsert(Id id,
                                   PastContent existingContent)
                            throws PastException

  Checks if a insert operation should be allowed. Invoked when a Past node receives an insert request and it is a replica root for the id; invoked on the object to be inserted. This method determines the effect of an insert operation on an object that already exists: it computes the new value of the stored object, as a function of the new and the existing object.

  Specified by:
    `checkInsert` in interface `PastContent`
  Parameters:
    `id` - the key identifying the object
    `existingContent` - DESCRIBE THE PARAMETER
  Returns:
    null, if the operation is not allowed; else, the new object to be stored on the local node.
  Throws:
    `PastException` - DESCRIBE THE EXCEPTION

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