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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.reef.tang.util;

import java.util.Collection;
import java.util.Comparator;
import java.util.TreeSet;

public class MonotonicSet extends TreeSet {
  private static final long serialVersionUID = 1L;

  public MonotonicSet() {
    super();
  }

  public MonotonicSet(final TreeSet c) {
    super(c.comparator());
    addAll(c);
  }

  public MonotonicSet(final Comparator c) {
    super(c);
  }

  @Override
  public boolean add(final T e) {
    if (super.contains(e)) {
      throw new IllegalArgumentException("Attempt to re-add " + e
          + " to MonotonicSet!");
    }
    return super.add(e);
  }

  @Override
  public void clear() {
    throw new UnsupportedOperationException("Attempt to clear MonotonicSet!");
  }

  @Override
  public boolean remove(final Object o) {
    throw new UnsupportedOperationException("Attempt to remove " + o
        + " from MonotonicSet!");
  }

  @Override
  public boolean removeAll(final Collection c) {
    throw new UnsupportedOperationException(
        "removeAll() doesn't make sense for MonotonicSet!");
  }

  @Override
  public boolean retainAll(final Collection c) {
    throw new UnsupportedOperationException(
        "retainAll() doesn't make sense for MonotonicSet!");
  }

  @Override
  public boolean addAll(final Collection c) {
    for (final T t : c) {
      add(t);
    }
    return c.size() != 0;
  }

  public boolean addAllIgnoreDuplicates(final Collection c) {
    boolean ret = false;
    for (final T t : c) {
      if (!contains(t)) {
        add(t);
        ret = true;
      }
    }
    return ret;
  }
}