/*

 * Copyright 1997-2008 Sun Microsystems, Inc.  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.  Sun designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

package javax.swing;

import java.util.Enumeration;

import java.util.Locale;

/**

 *

 * @author Hans Muller

 */

class MultiUIDefaults extends UIDefaults

{

    private UIDefaults[] tables;

    public MultiUIDefaults(UIDefaults[] defaults) {

        super();

        tables = defaults;

    }

    public MultiUIDefaults() {

        super();

        tables = new UIDefaults[0];

    }

    public Object get(Object key)

    {

        Object value = super.get(key);

        if (value != null) {

            return value;

        }

        for (UIDefaults table : tables) {

            value = (table != null) ? table.get(key) : null;

            if (value != null) {

                return value;

            }

        }

        return null;

    }

    public Object get(Object key, Locale l)

    {

        Object value = super.get(key,l);

        if (value != null) {

            return value;

        }

        for (UIDefaults table : tables) {

            value = (table != null) ? table.get(key,l) : null;

            if (value != null) {

                return value;

            }

        }

        return null;

    }

    public int size() {

        int n = super.size();

        for (UIDefaults table : tables) {

            n += (table != null) ? table.size() : 0;

        }

        return n;

    }

    public boolean isEmpty() {

        return size() == 0;

    }

    public Enumeration<Object> keys()

    {

        Enumeration[] enums = new Enumeration[1 + tables.length];

        enums[0] = super.keys();

        for(int i = 0; i < tables.length; i++) {

            UIDefaults table = tables[i];

            if (table != null) {

                enums[i + 1] = table.keys();

            }

        }

        return new MultiUIDefaultsEnumerator(enums);

    }

    public Enumeration<Object> elements()

    {

        Enumeration[] enums = new Enumeration[1 + tables.length];

        enums[0] = super.elements();

        for(int i = 0; i < tables.length; i++) {

            UIDefaults table = tables[i];

            if (table != null) {

                enums[i + 1] = table.elements();

            }

        }

        return new MultiUIDefaultsEnumerator(enums);

    }

    protected void getUIError(String msg) {

        if (tables.length > 0) {

            tables[0].getUIError(msg);

        } else {

            super.getUIError(msg);

        }

    }

    private static class MultiUIDefaultsEnumerator implements Enumeration<Object>

    {

        Enumeration[] enums;

        int n = 0;

        MultiUIDefaultsEnumerator(Enumeration[] enums) {

            this.enums = enums;

        }

        public boolean hasMoreElements() {

            for(int i = n; i < enums.length; i++) {

                Enumeration e = enums[i];

                if ((e != null) && (e.hasMoreElements())) {

                    return true;

                }

            }

            return false;

        }

        public Object nextElement() {

            for(; n < enums.length; n++) {

                Enumeration e = enums[n];

                if ((e != null) && (e.hasMoreElements())) {

                    return e.nextElement();

                }

            }

            return null;

        }

    }

    public Object remove(Object key)

    {

        Object value = super.remove(key);

        if (value != null) {

            return value;

        }

        for (UIDefaults table : tables) {

            value = (table != null) ? table.remove(key) : null;

            if (value != null) {

                return value;

            }

        }

        return null;

    }

    public void clear() {

        super.clear();

        for (UIDefaults table : tables) {

            if (table != null) {

                table.clear();

            }

        }

    }

    public synchronized String toString() {

        StringBuffer buf = new StringBuffer();

        buf.append("{");

        Enumeration keys = keys();

        while (keys.hasMoreElements()) {

            Object key = keys.nextElement();

            buf.append(key + "=" + get(key) + ", ");

        }

        int length = buf.length();

        if (length > 1) {

            buf.delete(length-2, length);

        }

        buf.append("}");

        return buf.toString();

    }

}