01: package org.drools.common;
02:
03: /*
04: * Copyright 2005 JBoss Inc
05: *
06: * Licensed under the Apache License, Version 2.0 (the "License");
07: * you may not use this file except in compliance with the License.
08: * You may obtain a copy of the License at
09: *
10: * http://www.apache.org/licenses/LICENSE-2.0
11: *
12: * Unless required by applicable law or agreed to in writing, software
13: * distributed under the License is distributed on an "AS IS" BASIS,
14: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15: * See the License for the specific language governing permissions and
16: * limitations under the License.
17: */
18:
19: import org.drools.FactHandle;
20: import org.drools.spi.Activation;
21: import org.drools.util.AbstractBaseLinkedListNode;
22:
23: /**
24: * LogicalDependency is a special node for LinkedLists that maintains
25: * references for the Activation justifier and the justified FactHandle.
26: *
27: * @author <a href="mailto:mark.proctor@jboss.com">Mark Proctor</a>
28: *
29: */
30: public class LogicalDependency extends AbstractBaseLinkedListNode {
31: private Activation justifier;
32: private FactHandle factHandle;
33:
34: public LogicalDependency(final Activation justifier,
35: final FactHandle factHandle) {
36: super ();
37: this .justifier = justifier;
38: this .factHandle = factHandle;
39: }
40:
41: public FactHandle getFactHandle() {
42: return this .factHandle;
43: }
44:
45: public Activation getJustifier() {
46: return this .justifier;
47: }
48:
49: public boolean equals(final Object object) {
50: if (this == object) {
51: return true;
52: }
53:
54: if (object == null || !(object instanceof LogicalDependency)) {
55: return false;
56: }
57:
58: final LogicalDependency other = (LogicalDependency) object;
59: return (this .getJustifier() == other.getJustifier() && this
60: .getFactHandle() == other.getFactHandle());
61: }
62:
63: public int hashCode() {
64: return this.justifier.hashCode();
65: }
66: }
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