Source Code Cross Referenced for TransitionTargetComparator.java in  » Library » Apache-commons-scxml-0.6-src » org » apache » commons » scxml » semantics » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Library » Apache commons scxml 0.6 src » org.apache.commons.scxml.semantics 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /*
02:         * Licensed to the Apache Software Foundation (ASF) under one or more
03:         * contributor license agreements.  See the NOTICE file distributed with
04:         * this work for additional information regarding copyright ownership.
05:         * The ASF licenses this file to You under the Apache License, Version 2.0
06:         * (the "License"); you may not use this file except in compliance with
07:         * the License.  You may obtain a copy of the License at
08:         *
09:         *     http://www.apache.org/licenses/LICENSE-2.0
10:         *
11:         * Unless required by applicable law or agreed to in writing, software
12:         * distributed under the License is distributed on an "AS IS" BASIS,
13:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14:         * See the License for the specific language governing permissions and
15:         * limitations under the License.
16:         */
17:        package org.apache.commons.scxml.semantics;
18:
19:        import java.io.Serializable;
20:        import java.util.Comparator;
21:
22:        import org.apache.commons.scxml.SCXMLHelper;
23:        import org.apache.commons.scxml.model.TransitionTarget;
24:
25:        /**
26:         * A comparator for TransitionTarget instances.
27:         *
28:         */
29:        final class TransitionTargetComparator implements  Comparator,
30:                Serializable {
31:
32:            /**
33:             * Serial version UID.
34:             */
35:            private static final long serialVersionUID = 1L;
36:
37:            /**
38:             * Constructor.
39:             */
40:            TransitionTargetComparator() {
41:                super ();
42:            }
43:
44:            /**
45:             * Compares two instances of TransitionTarget in terms of the
46:             * SCXML tree hierarchy.
47:             * <p>Important Remarks:</p> does not fullfill the Comparator contract,
48:             * since it returns 0 if o1 == o2 and also if they are not related to each
49:             * other and at the same time the chain-to-parent length for o1 is the
50:             * same length as for o2 (that is, they are equally deeply nested)
51:             *
52:             * @param o1 The first TransitionTarget object
53:             * @param o2 The second TransitionTarget object
54:             * @return int The comparation result
55:             * @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
56:             * @see TransitionTarget
57:             */
58:            public int compare(final Object o1, final Object o2) {
59:                TransitionTarget tt1 = (TransitionTarget) o1;
60:                TransitionTarget tt2 = (TransitionTarget) o2;
61:                if (tt1 == tt2) {
62:                    return 0;
63:                } else if (SCXMLHelper.isDescendant(tt1, tt2)) {
64:                    return -1;
65:                } else if (SCXMLHelper.isDescendant(tt2, tt1)) {
66:                    return 1;
67:                } else {
68:                    //the tt1 and tt2 are parallel, now we have to count chain sizes
69:                    int tc1 = countChainLength(tt1);
70:                    int tc2 = countChainLength(tt2);
71:                    //longer the chain, deeper the node is
72:                    return tc2 - tc1;
73:                }
74:            }
75:
76:            /**
77:             * The &quot;depth&quot; at which this TransitionTarget exists in the
78:             * SCXML object model.
79:             *
80:             * @param tt The TransitionTarget
81:             * @return int The &quot;depth&quot;
82:             */
83:            private int countChainLength(final TransitionTarget tt) {
84:                int count = 0;
85:                TransitionTarget parent = tt.getParent();
86:                while (parent != null) {
87:                    count++;
88:                    parent = parent.getParent();
89:                }
90:                return count;
91:            }
92:        }
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