/*
 * Copyright (c) 2002 - 2006 IBM Corporation.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 */
package com.ibm.wala.util.intset;

import java.util.Arrays;
import java.util.TreeSet;

/** An object that creates mutable sparse int sets. */
public class MutableSparseLongSetFactory implements MutableLongSetFactory {

  /** @throws IllegalArgumentException if set is null */
  @Override
  public MutableLongSet make(long[] set) {
    if (set == null) {
      throw new IllegalArgumentException("set is null");
    }
    if (set.length == 0) {
      return new MutableSparseLongSet();
    } else {
      // XXX not very efficient.
      TreeSet<Long> T = new TreeSet<>();
      for (long element : set) {
        T.add(element);
      }
      long[] copy = new long[T.size()];
      int i = 0;
      for (Long I : T) {
        copy[i++] = I;
      }
      MutableSparseLongSet result = new MutableSparseLongSet(copy);
      return result;
    }
  }

  @Override
  public MutableLongSet parse(String string) throws NumberFormatException {
    int[] backingStore = SparseIntSet.parseIntArray(string);
    long[] bs = Arrays.stream(backingStore).asLongStream().toArray();
    return new MutableSparseLongSet(bs);
  }

  @Override
  public MutableLongSet makeCopy(LongSet x) throws IllegalArgumentException {
    if (x == null) {
      throw new IllegalArgumentException("x == null");
    }
    return MutableSparseLongSet.make(x);
  }

  @Override
  public MutableLongSet make() {
    return new MutableSparseLongSet();
  }
}
