FilledList.java

/*
Copyright 2011-2016 Google Inc. 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 com.google.security.zynamics.zylib.types.lists;

import com.google.common.base.Preconditions;

import java.util.ArrayList;
import java.util.Collection;

/**
 * ArrayList which is guaranteed not to have null-elements.
 *
 * @param <T> Type of the objects in the list.
 */
public class FilledList<T> extends ArrayList<T> implements IFilledList<T> {

  /**
   * Creates an empty filled list.
   */
  public FilledList() {
  }

  /**
   * Creates a filled list from a collection.
   *
   * @param collection The collection whose elements are put into the FilledList.
   */
  public FilledList(final Collection<? extends T> collection) {
    super(collection);

    for (final T t : collection) {
      Preconditions.checkNotNull(t, "Error: Can not add null-elements to filled lists");
    }
  }

  @Override
  public void add(final int index, final T o) {
    Preconditions.checkNotNull(o, "Error: Can not add null-elements to filled lists");

    super.add(index, o);
  }

  @Override
  public boolean add(final T o) {
    Preconditions.checkNotNull(o, "Error: Can not add null-elements to filled lists");

    return super.add(o);
  }

  @Override
  public boolean addAll(final Collection<? extends T> c) {
    for (final T t : c) {
      Preconditions.checkNotNull(t, "Error: Can not add null-elements to filled lists");
    }

    return super.addAll(c);
  }

  @Override
  public boolean addAll(final int index, final Collection<? extends T> c) {
    for (final T t : c) {
      Preconditions.checkNotNull(t, "Error: Can not add null-elements to filled lists");
    }

    return super.addAll(index, c);
  }
}