JXCSkinCache.java

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/*
 * This file is part of JXClient, the Fullscreen Java Crossfire Client.
 *
 * JXClient is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * JXClient 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 for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with JXClient; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * Copyright (C) 2005-2008 Yann Chachkoff.
 * Copyright (C) 2006-2011 Andreas Kirschbaum.
 */

package com.realtime.crossfire.jxclient.skin.skin;

import java.util.Collections;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

public class JXCSkinCache<T> implements Iterable<T> {

    @NotNull
    private final String ident;

    @NotNull
    private final Map<String, T> cache = new LinkedHashMap<>();

    public JXCSkinCache(@NotNull final String ident) {
        this.ident = ident;
    }

    public void clear() {
        cache.clear();
    }

    public void insert(@NotNull final String name, @NotNull final T t) throws JXCSkinException {
        if (cache.containsKey(name)) {
            throw new JXCSkinException("duplicate "+ident+" name: "+name);
        }

        cache.put(name, t);
    }

    @NotNull
    public T lookup(@NotNull final String name) throws JXCSkinException {
        final T t = cache.get(name);
        if (t == null) {
            throw new JXCSkinException("undefined "+ident+" name: "+name);
        }

        return t;
    }

    @Nullable
    public T lookupOptional(@NotNull final String name) {
        return cache.get(name);
    }

    @NotNull
    @Override
    public Iterator<T> iterator() {
        return Collections.unmodifiableCollection(cache.values()).iterator();
    }

}