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 * Copyright (c) 2003, 2005, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 */

package sun.awt.X11;

import java.util.*;

Helper class to ease the work with the lists of atoms.
/**
 * Helper class to ease the work with the lists of atoms.
 */
class XAtomList {
    Set<XAtom> atoms = new HashSet<XAtom>();

    
Creates empty list.
/**
     * Creates empty list.
     */
    public XAtomList() {
    }

    
Creates instance of XAtomList and initializes it with
the contents pointer by data.
Uses default display to initialize atoms.
/**
     * Creates instance of XAtomList and initializes it with
     * the contents pointer by <code>data</code>.
     * Uses default display to initialize atoms.
     */
    public XAtomList(long data, int count) {
        init(data, count);
    }
    private void init(long data, int count) {
        for (int i = 0; i < count; i++) {
            add(new XAtom(XToolkit.getDisplay(), XAtom.getAtom(data+count*XAtom.getAtomSize())));
        }
    }

    
Creates instance of XAtomList and initializes it with
the arrays of atoms. Array can contain null atoms.
/**
     * Creates instance of XAtomList and initializes it with
     * the arrays of atoms. Array can contain null atoms.
     */
    public XAtomList(XAtom[] atoms) {
        init(atoms);
    }
    private void init(XAtom[] atoms) {
        for (int i = 0; i < atoms.length; i++) {
            add(atoms[i]);
        }
    }

    
Returns contents of the list as array of atoms.
/**
     * Returns contents of the list as array of atoms.
     */
    public XAtom[] getAtoms() {
        XAtom[] res = new XAtom[size()];
        Iterator<XAtom> iter = atoms.iterator();
        int i = 0;
        while (iter.hasNext()) {
            res[i++] = iter.next();
        }
        return res;
    }

    
Returns contents of the list as pointer to native data
The size of the native data is size of the list multiplied by
size of the Atom type on the platform. Caller is responsible for
freeing the data by Unsafe.freeMemory when it is no longer needed.
/**
     * Returns contents of the list as pointer to native data
     * The size of the native data is size of the list multiplied by
     * size of the Atom type on the platform. Caller is responsible for
     * freeing the data by Unsafe.freeMemory when it is no longer needed.
     */
    public long getAtomsData() {
        return XAtom.toData(getAtoms());
    }

    
Returns true if this list contains the atom atom
/**
     * Returns true if this list contains the atom <code>atom</code>
     */
    public boolean contains(XAtom atom) {
        return atoms.contains(atom);
    }

    
Add atom to the list. Does nothing if list already contains this atom.
/**
     * Add atom to the list. Does nothing if list already contains this atom.
     */
    public void add(XAtom atom) {
        atoms.add(atom);
    }

    
Removes atom from the list. Does nothing if arrays doesn't conaint this atom.
/**
     * Removes atom from the list. Does nothing if arrays doesn't conaint this atom.
     */
    public void remove(XAtom atom) {
        atoms.remove(atom);
    }


    
Returns size of the list
/**
     * Returns size of the list
     */
    public int size() {
        return atoms.size();
    }

    
Returns a subset of a list which is intersection of this set and set build by mapping mask in
mapping.
/**
     * Returns a subset of a list which is intersection of this set and set build by mapping <code>mask</code> in
     * <code>mapping</code>.
     */
    public XAtomList subset(int mask, Map<Integer, XAtom> mapping) {
        XAtomList res = new XAtomList();
        Iterator<Integer> iter = mapping.keySet().iterator();
        while (iter.hasNext()) {
            Integer bits = iter.next();
            if ( (mask & bits.intValue()) == bits.intValue() ) {
                XAtom atom = mapping.get(bits);
                if (contains(atom)) {
                    res.add(atom);
                }
            }
        }
        return res;
    }

    
Returns iterator for items.
/**
     * Returns iterator for items.
     */
    public Iterator<XAtom> iterator() {
        return atoms.iterator();
    }

    
Merges without duplicates all the atoms from another list
/**
     * Merges without duplicates all the atoms from another list
     */
    public void addAll(XAtomList atoms) {
        Iterator<XAtom> iter = atoms.iterator();
        while(iter.hasNext()) {
            add(iter.next());
        }
    }

    public String toString() {
        StringBuffer buf = new StringBuffer();
        buf.append("[");
        Iterator iter = atoms.iterator();
        while (iter.hasNext()) {
            buf.append(iter.next().toString());
            if (iter.hasNext()) {
                buf.append(", ");
            }
        }
        buf.append("]");
        return buf.toString();
    }
}