org.bytedeco.javacpp.tools.IndexedSet Maven / Gradle / Ivy

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/*
 * Copyright (C) 2014 Samuel Audet
 *
 * Licensed either under the Apache License, Version 2.0, or (at your option)
 * under the terms of the GNU General Public License as published by
 * the Free Software Foundation (subject to the "Classpath" exception),
 * either version 2, or any later version (collectively, 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
 *     http://www.gnu.org/licenses/
 *     http://www.gnu.org/software/classpath/license.html
 *
 * or as provided in the LICENSE.txt file that accompanied this code.
 * 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.bytedeco.javacpp.tools;

import java.util.Iterator;
import java.util.LinkedHashMap;

/**
 *
 * @author Samuel Audet
 */
class IndexedSet extends LinkedHashMap implements Iterable {
    public int index(E e) {
        Integer i = get(e);
        if (i == null) {
            put(e, i = size());
        }
        return i;
    }

    @Override public Iterator iterator() {
        return keySet().iterator();
    }
}