|
1
23
24 package com.sun.enterprise.config.serverbeans.validation;
25
26 import java.util.TreeMap  ;
27 import java.util.HashSet ;
28 import java.util.Iterator ;
29 import java.util.Map ;
30 import java.util.Properties ;
31 import java.util.Set ;
32
33
34
35
41
42 class Frame {
43 static Frame newFrame(){
47 return new Frame(
48 new Frame(){
49 String lookup(String s){
50 return (System.getProperty(s) != null
51 ? System.getProperty(s)
52 : "${"+s+"}");
53 }
54 public String toString(){
55 return "[]";
56 }
57 }
58 );
59 }
60 static Frame newFrame(Frame f){
61 return new Frame(f);
62 }
63 String lookup(String s){
64 return (map.get(s) != null ? (String ) map.get(s) : parent.lookup(s));
65 }
66
67 Frame put(String key, String value){
68 map.put(key, value);
69 return this;
70 }
71
72 Frame inheritFrom(Frame f) throws IllegalArgumentException {
73 if (contains(getAncestors(),f) || contains(f.getAncestors(),this)){
74 throw new IllegalArgumentException ("Inheriting from an ancestor is illegal - it causes loops!");
75 }
76 parent = f;
77 return this;
78 }
79
80 private boolean contains(Set s, Frame f){
81 for (Iterator it = s.iterator(); it.hasNext();){
82 if (it.next() == f) {
83 return true;
84 }
85 }
86 return false;
87 }
88
89 public String toString(){
90 StringBuffer sb = new StringBuffer ("[");
91 for (Iterator it = map.entrySet().iterator(); it.hasNext();){
92 Map.Entry e = (Map.Entry ) it.next();
93 sb.append(e.getKey() + "->" + e.getValue());
94 if (it.hasNext()){
95 sb.append(", ");
96 }
97 }
98 sb.append(" "+parent +"]");
99 return sb.toString();
100 }
101
102
103 public boolean equals(Object o){
104 return this == o || (o != null && o instanceof Frame && this.equals((Frame) o));
105 }
106
114 public int hashCode(){
115 return map.hashCode();
116 }
117
118 private boolean equals(Frame o){
119 return o != null
120 && (this.map.equals(o.map)
121 && ((this.parent == null && o.parent == null) ||
122 (this.parent != null && this.parent.equals(o.parent))));
123 }
124
125
126
127 private Frame(){}
128 private Frame(Frame f){
129 parent = f;
130 }
131
132 private Map map = new TreeMap ();
133 private Frame parent;
134
135 private Set getAncestors(){
136 if (parent == null){
137 return new HashSet ();
138 } else {
139 Set ancestors = parent.getAncestors();
140 ancestors.add(this);
141 return ancestors;
142 }
143
144 }
145
146 }
147
148 |
Popular Tags |
Java API By Example, From Geeks To Geeks.