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25 
26 package sun.awt.X11;
27 
28 import java.util.*;
29 
30 /**
31  * Helper class to ease the work with the lists of atoms.
32  */
33 class XAtomList {
34     Set<XAtom> atoms = new HashSet<XAtom>();
35 
36     /**
37      * Creates empty list.
38      */
XAtomList()39     public XAtomList() {
40     }
41 
42     /**
43      * Creates instance of XAtomList and initializes it with
44      * the contents pointer by <code>data</code>.
45      * Uses default display to initialize atoms.
46      */
XAtomList(long data, int count)47     public XAtomList(long data, int count) {
48         init(data, count);
49     }
init(long data, int count)50     private void init(long data, int count) {
51         for (int i = 0; i < count; i++) {
52             add(new XAtom(XToolkit.getDisplay(), XAtom.getAtom(data+count*XAtom.getAtomSize())));
53         }
54     }
55 
56     /**
57      * Creates instance of XAtomList and initializes it with
58      * the arrays of atoms. Array can contain null atoms.
59      */
XAtomList(XAtom[] atoms)60     public XAtomList(XAtom[] atoms) {
61         init(atoms);
62     }
init(XAtom[] atoms)63     private void init(XAtom[] atoms) {
64         for (int i = 0; i < atoms.length; i++) {
65             add(atoms[i]);
66         }
67     }
68 
69     /**
70      * Returns contents of the list as array of atoms.
71      */
getAtoms()72     public XAtom[] getAtoms() {
73         XAtom[] res = new XAtom[size()];
74         Iterator<XAtom> iter = atoms.iterator();
75         int i = 0;
76         while (iter.hasNext()) {
77             res[i++] = iter.next();
78         }
79         return res;
80     }
81 
82     /**
83      * Returns contents of the list as pointer to native data
84      * The size of the native data is size of the list multiplied by
85      * size of the Atom type on the platform. Caller is responsible for
86      * freeing the data by Unsafe.freeMemory when it is no longer needed.
87      */
getAtomsData()88     public long getAtomsData() {
89         return XAtom.toData(getAtoms());
90     }
91 
92     /**
93      * Returns true if this list contains the atom <code>atom</code>
94      */
contains(XAtom atom)95     public boolean contains(XAtom atom) {
96         return atoms.contains(atom);
97     }
98 
99     /**
100      * Add atom to the list. Does nothing if list already contains this atom.
101      */
add(XAtom atom)102     public void add(XAtom atom) {
103         atoms.add(atom);
104     }
105 
106     /**
107      * Removes atom from the list. Does nothing if arrays doesn't conaint this atom.
108      */
remove(XAtom atom)109     public void remove(XAtom atom) {
110         atoms.remove(atom);
111     }
112 
113 
114     /**
115      * Returns size of the list
116      */
size()117     public int size() {
118         return atoms.size();
119     }
120 
121     /**
122      * Returns a subset of a list which is intersection of this set and set build by mapping <code>mask</code> in
123      * <code>mapping</code>.
124      */
subset(int mask, Map<Integer, XAtom> mapping)125     public XAtomList subset(int mask, Map<Integer, XAtom> mapping) {
126         XAtomList res = new XAtomList();
127         Iterator<Integer> iter = mapping.keySet().iterator();
128         while (iter.hasNext()) {
129             Integer bits = iter.next();
130             if ( (mask & bits.intValue()) == bits.intValue() ) {
131                 XAtom atom = mapping.get(bits);
132                 if (contains(atom)) {
133                     res.add(atom);
134                 }
135             }
136         }
137         return res;
138     }
139 
140     /**
141      * Returns iterator for items.
142      */
iterator()143     public Iterator<XAtom> iterator() {
144         return atoms.iterator();
145     }
146 
147     /**
148      * Merges without duplicates all the atoms from another list
149      */
addAll(XAtomList atoms)150     public void addAll(XAtomList atoms) {
151         Iterator<XAtom> iter = atoms.iterator();
152         while(iter.hasNext()) {
153             add(iter.next());
154         }
155     }
156 
toString()157     public String toString() {
158         StringBuffer buf = new StringBuffer();
159         buf.append("[");
160         Iterator iter = atoms.iterator();
161         while (iter.hasNext()) {
162             buf.append(iter.next().toString());
163             if (iter.hasNext()) {
164                 buf.append(", ");
165             }
166         }
167         buf.append("]");
168         return buf.toString();
169     }
170 }
171