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Copyright (c) 2003, 2008 IBM Corporation and others. All rights reserved. This program and the accompanying materials are made available under the terms of the Eclipse Public License v1.0 which accompanies this distribution, and is available at http://www.eclipse.org/legal/epl-v10.html Contributors: IBM Corporation - initial API and implementation /
 
 package org.eclipse.osgi.service.resolver;

BundleDeltas represent the changes related to an individual bundle between two states.

This interface is not intended to be implemented by clients. The StateObjectFactory should be used to construct instances.

Since:
3.1
Noimplement:
This interface is not intended to be implemented by clients.
 
 public interface BundleDelta extends Comparable {

Delta type constant (bit mask) indicating that the bundle has been added to the new state.

See also:
getType()
 
 	public static final int ADDED = 0x1;
Delta type constant (bit mask) indicating that the bundle is no longer present in the new state.

See also:
getType()
 
 	public static final int REMOVED = 0x2;
Delta type constant (bit mask) indicating that the bundle has been updated between the old and new state. Note that an update delta may in fact represent a downgrading of the bundle to a previous version.

See also:
getType()
 
 	public static final int UPDATED = 0x4;
Delta type constant (bit mask) indicating that the bundle has become resolved in the new state.

See also:
getType()
 
 	public static final int RESOLVED = 0x8;
Delta type constant (bit mask) indicating that the bundle has become unresolved in the new state. Note that newly added bundles are unresolved by default and as such, do not transition to unresolved state so this flag is not set.

See also:
getType()
 
 	public static final int UNRESOLVED = 0x10;
Delta type constant (bit mask) indicating that the bundles and packages which this bundle requires/imports (respectively) have changed in the new state.

Deprecated:
this type is no longer valid
See also:
getType()
 
 	public static final int LINKAGE_CHANGED = 0x20;

Delta type constant (bit mask) indicating that the bundles which this bundle optionally requires have changed in the new state.

Deprecated:
this type is no longer valid
See also:
getType()
 
 	public static final int OPTIONAL_LINKAGE_CHANGED = 0x40;

Delta type constant (bit mask) indicating that the this bundle is pending a removal. Note that bundles with this flag set will also have the REMOVED flag set. A bundle will have this flag set if it has been removed from the state but has other existing bundles in the state that depend on it.

See also:
getType()
 
 	public static final int REMOVAL_PENDING = 0x80;

Delta type constant (bit mask) indicating that the this bundle has completed a pending removal. A bundle will complete a pending removal only after it has been re-resolved by the resolver.
 
 	public static final int REMOVAL_COMPLETE = 0x100;

Returns the BundleDescription that this bundle delta is for.

Returns:
the BundleDescription that this bundle delta is for.
 
Returns the type of change which occured. The return value is composed of by bit-wise masking the relevant flags from the set ADDED, REMOVED, UPDATED, RESOLVED, UNRESOLVED, LINKAGE_CHANGED, REMOVAL_PENDING, REMOVAL_COMPLETE. Note that bundle start and stop state changes are not captured in the delta as they do not represent structural changes but rather transient runtime states.

Returns:
the type of change which occured
	public int getType();

Answers an integer indicating the relative positions of the receiver and the argument in the natural order of elements of the receiver's class.

The natural order of elements is determined by the bundle id of the BundleDescription that this bundle delta is for.

Parameters:
obj another BundleDelta an object to compare the receiver to
Returns:
int which should be <0 if the receiver should sort before the argument, 0 if the receiver should sort in the same position as the argument, and >0 if the receiver should sort after the argument.
Throws:
java.lang.ClassCastException if the argument can not be converted into something comparable with the receiver.
	public int compareTo(Object obj);
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