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/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2014 Red Hat, Inc., and individual contributors
 * as indicated by the @author tags.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.jboss.marshalling.util;

import java.util.AbstractMap;
import java.util.AbstractSet;
import java.util.ArrayList;
import java.util.Comparator;
import java.util.Iterator;
import java.util.List;
import java.util.NavigableMap;
import java.util.NavigableSet;
import java.util.Set;
import java.util.SortedMap;

/**
 * @author David M. Lloyd
 */
public final class FlatNavigableMap extends AbstractMap implements NavigableMap {
    private final Comparator comparator;
    private final List> entries = new ArrayList>();
    private final Set> entrySet = new AbstractSet>() {
        public Iterator> iterator() {
            return entries.iterator();
        }

        public int size() {
            return entries.size();
        }
    };

    public V put(final K key, final V value) {
        entries.add(new EntryImpl(key, value));
        return null;
    }

    public FlatNavigableMap(final Comparator comparator) {
        this.comparator = comparator;
    }

    public Comparator comparator() {
        return comparator;
    }

    public Set> entrySet() {
        return entrySet;
    }

    public Entry lowerEntry(final K key) {
        throw new UnsupportedOperationException();
    }

    public K lowerKey(final K key) {
        throw new UnsupportedOperationException();
    }

    public Entry floorEntry(final K key) {
        throw new UnsupportedOperationException();
    }

    public K floorKey(final K key) {
        throw new UnsupportedOperationException();
    }

    public Entry ceilingEntry(final K key) {
        throw new UnsupportedOperationException();
    }

    public K ceilingKey(final K key) {
        throw new UnsupportedOperationException();
    }

    public Entry higherEntry(final K key) {
        throw new UnsupportedOperationException();
    }

    public K higherKey(final K key) {
        throw new UnsupportedOperationException();
    }

    public Entry firstEntry() {
        throw new UnsupportedOperationException();
    }

    public Entry lastEntry() {
        throw new UnsupportedOperationException();
    }

    public Entry pollFirstEntry() {
        throw new UnsupportedOperationException();
    }

    public Entry pollLastEntry() {
        throw new UnsupportedOperationException();
    }

    public NavigableMap descendingMap() {
        throw new UnsupportedOperationException();
    }

    public NavigableSet navigableKeySet() {
        throw new UnsupportedOperationException();
    }

    public NavigableSet descendingKeySet() {
        throw new UnsupportedOperationException();
    }

    public NavigableMap subMap(final K fromKey, final boolean fromInclusive, final K toKey, final boolean toInclusive) {
        throw new UnsupportedOperationException();
    }

    public NavigableMap headMap(final K toKey, final boolean inclusive) {
        throw new UnsupportedOperationException();
    }

    public NavigableMap tailMap(final K fromKey, final boolean inclusive) {
        throw new UnsupportedOperationException();
    }

    public SortedMap subMap(final K fromKey, final K toKey) {
        throw new UnsupportedOperationException();
    }

    public SortedMap headMap(final K toKey) {
        throw new UnsupportedOperationException();
    }

    public SortedMap tailMap(final K fromKey) {
        throw new UnsupportedOperationException();
    }

    public K firstKey() {
        throw new UnsupportedOperationException();
    }

    public K lastKey() {
        throw new UnsupportedOperationException();
    }

    static final class EntryImpl implements Entry {
        private final K key;
        private V value;

        EntryImpl(final K key, final V value) {
            this.key = key;
            this.value = value;
        }

        public K getKey() {
            return key;
        }

        public V getValue() {
            return value;
        }

        public V setValue(final V value) {
            try {
                return this.value;
            } finally {
                this.value = value;
            }
        }

        private static int hashOf(Object obj) {
            return obj == null ? 0 : obj.hashCode();
        }

        private static boolean equals(Object a, Object b) {
            return a == null ? b == null : a.equals(b);
        }

        public final int hashCode() {
            return hashOf(getKey()) ^ hashOf(getValue());
        }

        public final boolean equals(final Object obj) {
            return obj instanceof Entry && equals((Entry) obj);
        }

        public final boolean equals(final Entry obj) {
            return obj != null && equals(getKey(), obj.getKey()) && equals(getValue(), obj.getValue());
        }

        public String toString() {
            return String.format("{%s=>%s}", getKey(), getValue());
        }
    }
}