Util.java

/*
 * Copyright (C) 2012 The Android Open Source Project
 *
 * 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.koushikdutta.async.http.spdy;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;

/** Junk drawer of utility methods. */
final class Util {
  public static void checkOffsetAndCount(long arrayLength, long offset, long count) {
    if ((offset | count) < 0 || offset > arrayLength || arrayLength - offset < count) {
      throw new ArrayIndexOutOfBoundsException();
    }
  }

  /** Returns an immutable copy of {@code list}. */
  public static <T> List<T> immutableList(List<T> list) {
    return Collections.unmodifiableList(new ArrayList<T>(list));
  }

  /** Returns an immutable list containing {@code elements}. */
  public static <T> List<T> immutableList(T... elements) {
    return Collections.unmodifiableList(Arrays.asList(elements.clone()));
  }
}