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/* 
 Copyright (C) GridGain Systems. All Rights Reserved.
 
 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.gridgain.grid.util;

import org.gridgain.grid.util.typedef.*;
import org.gridgain.grid.util.typedef.internal.*;

import java.util.*;

/**
 * Set counterpart for {@link IdentityHashMap}.
 */
public class GridIdentityHashSet extends GridSetWrapper {
    /**
     * Creates default identity hash set.
     */
    public GridIdentityHashSet() {
        super(new IdentityHashMap());
    }

    /**
     * Creates identity hash set of given size.
     *
     * @param size Start size for the set.
     */
    public GridIdentityHashSet(int size) {
        super(new IdentityHashMap(size));

        A.ensure(size >= 0, "size >= 0");
    }

    /**
     * Creates identity has set initialized given collection.
     *
     * @param vals Values to initialize.
     */
    public GridIdentityHashSet(Collection vals) {
        super(F.isEmpty(vals) ? new IdentityHashMap(0) : new IdentityHashMap(vals.size()), vals);
    }

    /** {@inheritDoc} */
    @Override public String toString() {
        return S.toString(GridIdentityHashSet.class, this, super.toString());
    }
}