/*

 * 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

 * or visit www.oracle.com if you need additional information or have any

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package javax.swing;

import java.util.Enumeration;

import java.util.HashSet;

import java.util.Iterator;

import java.util.Locale;

import java.util.Map.Entry;

import java.util.Set;

/**

 *

 * @author Hans Muller

 */

class MultiUIDefaults extends UIDefaults

{

    private UIDefaults[] tables;

    public MultiUIDefaults(UIDefaults[] defaults) {

        super();

        tables = defaults;

    }

    public MultiUIDefaults() {

        super();

        tables = new UIDefaults[0];

    }

    @Override

    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;

    }

    @Override

    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;

    }

    @Override

    public int size() {

        return entrySet().size();

    }

    @Override

    public boolean isEmpty() {

        return size() == 0;

    }

    @Override

    public Enumeration<Object> keys()

    {

        return new MultiUIDefaultsEnumerator(

                MultiUIDefaultsEnumerator.Type.KEYS, entrySet());

    }

    @Override

    public Enumeration<Object> elements()

    {

        return new MultiUIDefaultsEnumerator(

                MultiUIDefaultsEnumerator.Type.ELEMENTS, entrySet());

    }

    @Override

    public Set<Entry<Object, Object>> entrySet() {

        Set<Entry<Object, Object>> set = new HashSet<Entry<Object, Object>>();

        for (int i = tables.length - 1; i >= 0; i--) {

            if (tables[i] != null) {

                set.addAll(tables[i].entrySet());

            }

        }

        set.addAll(super.entrySet());

        return set;

    }

    @Override

    protected void getUIError(String msg) {

        if (tables.length > 0) {

            tables[0].getUIError(msg);

        } else {

            super.getUIError(msg);

        }

    }

    private static class MultiUIDefaultsEnumerator implements Enumeration<Object>

    {

        public static enum Type { KEYS, ELEMENTS };

        private Iterator<Entry<Object, Object>> iterator;

        private Type type;

        MultiUIDefaultsEnumerator(Type type, Set<Entry<Object, Object>> entries) {

            this.type = type;

            this.iterator = entries.iterator();

        }

        public boolean hasMoreElements() {

            return iterator.hasNext();

        }

        public Object nextElement() {

            switch (type) {

                case KEYS: return iterator.next().getKey();

                case ELEMENTS: return iterator.next().getValue();

                default: return null;

            }

        }

    }

    @Override

    public Object remove(Object key)

    {

        Object value = null;

        for (int i = tables.length - 1; i >= 0; i--) {

            if (tables[i] != null) {

                Object v = tables[i].remove(key);

                if (v != null) {

                    value = v;

                }

            }

        }

        Object v = super.remove(key);

        if (v != null) {

            value = v;

        }

        return value;

    }

    @Override

    public void clear() {

        super.clear();

        for (UIDefaults table : tables) {

            if (table != null) {

                table.clear();

            }

        }

    }

    @Override

    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();

    }

}