01: /*
02: * <copyright>
03: *
04: * Copyright 1997-2004 BBNT Solutions, LLC
05: * under sponsorship of the Defense Advanced Research Projects
06: * Agency (DARPA).
07: *
08: * You can redistribute this software and/or modify it under the
09: * terms of the Cougaar Open Source License as published on the
10: * Cougaar Open Source Website (www.cougaar.org).
11: *
12: * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
13: * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
14: * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
15: * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
16: * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
17: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
18: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
19: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
20: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
22: * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23: *
24: * </copyright>
25: */
26:
27: package org.cougaar.core.blackboard;
28:
29: import java.util.Collection;
30: import java.util.List;
31:
32: /**
33: * An {@link EnvelopeTuple} indicating that an object on the
34: * blackboard has been modified.
35: */
36: public class ChangeEnvelopeTuple extends EnvelopeTuple {
37: private final Object object;
38:
39: public Object getObject() {
40: return object;
41: }
42:
43: private final List changes;
44:
45: // perhaps at some point we should complain if we aren't told what the
46: // changes are...
47: public ChangeEnvelopeTuple(Object o, List changes) {
48: if (o == null)
49: throw new IllegalArgumentException("Object is null");
50: object = o;
51: this .changes = changes;
52: }
53:
54: public final int getAction() {
55: return Envelope.CHANGE;
56: }
57:
58: public final boolean isChange() {
59: return true;
60: }
61:
62: // useful for Logic Providers.
63: public Collection getChangeReports() {
64: return changes;
65: }
66:
67: boolean applyToSubscription(Subscription s, boolean isVisible) {
68: return s.conditionalChange(object, changes, isVisible);
69: }
70:
71: }
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