common/primitives/Ints.java

/*
 * Copyright (C) 2008 The Guava Authors
 *
 * 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.common.primitives;

import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkElementIndex;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Preconditions.checkPositionIndexes;

import com.google.common.annotations.Beta;
import com.google.common.annotations.GwtCompatible;
import com.google.common.base.Converter;

import java.io.Serializable;
import java.util.AbstractList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.RandomAccess;

import javax.annotation.CheckForNull;

/**
 * Static utility methods pertaining to {@code int} primitives, that are not
 * already found in either {@link Integer} or {@link Arrays}.
 *
 * <p>See the Guava User Guide article on <a href=
 * "http://code.google.com/p/guava-libraries/wiki/PrimitivesExplained">
 * primitive utilities</a>.
 *
 * @author Kevin Bourrillion
 * @since 1.0
 */
@GwtCompatible(emulated = true)
public final class Ints {
  private Ints() {}

  /**
   * The number of bytes required to represent a primitive {@code int}
   * value.
   */
  public static final int BYTES = Integer.SIZE / Byte.SIZE;

  /**
   * The largest power of two that can be represented as an {@code int}.
   *
   * @since 10.0
   */
  public static final int MAX_POWER_OF_TWO = 1 << (Integer.SIZE - 2);

  /**
   * Returns a hash code for {@code value}; equal to the result of invoking
   * {@code ((Integer) value).hashCode()}.
   *
   * @param value a primitive {@code int} value
   * @return a hash code for the value
   */
  public static int hashCode(int value) {
    return value;
  }

  /**
   * Returns the {@code int} value that is equal to {@code value}, if possible.
   *
   * @param value any value in the range of the {@code int} type
   * @return the {@code int} value that equals {@code value}
   * @throws IllegalArgumentException if {@code value} is greater than {@link
   *     Integer#MAX_VALUE} or less than {@link Integer#MIN_VALUE}
   */
  public static int checkedCast(long value) {
    int result = (int) value;
    if (result != value) {
      // don't use checkArgument here, to avoid boxing
      throw new IllegalArgumentException("Out of range: " + value);
    }
    return result;
  }

  /**
   * Returns the {@code int} nearest in value to {@code value}.
   *
   * @param value any {@code long} value
   * @return the same value cast to {@code int} if it is in the range of the
   *     {@code int} type, {@link Integer#MAX_VALUE} if it is too large,
   *     or {@link Integer#MIN_VALUE} if it is too small
   */
  public static int saturatedCast(long value) {
    if (value > Integer.MAX_VALUE) {
      return Integer.MAX_VALUE;
    }
    if (value < Integer.MIN_VALUE) {
      return Integer.MIN_VALUE;
    }
    return (int) value;
  }

  /**
   * Compares the two specified {@code int} values. The sign of the value
   * returned is the same as that of {@code ((Integer) a).compareTo(b)}.
   *
   * <p><b>Note for Java 7 and later:</b> this method should be treated as
   * deprecated; use the equivalent {@link Integer#compare} method instead.
   *
   * @param a the first {@code int} to compare
   * @param b the second {@code int} to compare
   * @return a negative value if {@code a} is less than {@code b}; a positive
   *     value if {@code a} is greater than {@code b}; or zero if they are equal
   */
  public static int compare(int a, int b) {
    return (a < b) ? -1 : ((a > b) ? 1 : 0);
  }

  /**
   * Returns {@code true} if {@code target} is present as an element anywhere in
   * {@code array}.
   *
   * @param array an array of {@code int} values, possibly empty
   * @param target a primitive {@code int} value
   * @return {@code true} if {@code array[i] == target} for some value of {@code
   *     i}
   */
  public static boolean contains(int[] array, int target) {
    for (int value : array) {
      if (value == target) {
        return true;
      }
    }
    return false;
  }

  /**
   * Returns the index of the first appearance of the value {@code target} in
   * {@code array}.
   *
   * @param array an array of {@code int} values, possibly empty
   * @param target a primitive {@code int} value
   * @return the least index {@code i} for which {@code array[i] == target}, or
   *     {@code -1} if no such index exists.
   */
  public static int indexOf(int[] array, int target) {
    return indexOf(array, target, 0, array.length);
  }

  // TODO(kevinb): consider making this public
  private static int indexOf(
      int[] array, int target, int start, int end) {
    for (int i = start; i < end; i++) {
      if (array[i] == target) {
        return i;
      }
    }
    return -1;
  }

  /**
   * Returns the start position of the first occurrence of the specified {@code
   * target} within {@code array}, or {@code -1} if there is no such occurrence.
   *
   * <p>More formally, returns the lowest index {@code i} such that {@code
   * java.util.Arrays.copyOfRange(array, i, i + target.length)} contains exactly
   * the same elements as {@code target}.
   *
   * @param array the array to search for the sequence {@code target}
   * @param target the array to search for as a sub-sequence of {@code array}
   */
  public static int indexOf(int[] array, int[] target) {
    checkNotNull(array, "array");
    checkNotNull(target, "target");
    if (target.length == 0) {
      return 0;
    }

    outer:
    for (int i = 0; i < array.length - target.length + 1; i++) {
      for (int j = 0; j < target.length; j++) {
        if (array[i + j] != target[j]) {
          continue outer;
        }
      }
      return i;
    }
    return -1;
  }

  /**
   * Returns the index of the last appearance of the value {@code target} in
   * {@code array}.
   *
   * @param array an array of {@code int} values, possibly empty
   * @param target a primitive {@code int} value
   * @return the greatest index {@code i} for which {@code array[i] == target},
   *     or {@code -1} if no such index exists.
   */
  public static int lastIndexOf(int[] array, int target) {
    return lastIndexOf(array, target, 0, array.length);
  }

  // TODO(kevinb): consider making this public
  private static int lastIndexOf(
      int[] array, int target, int start, int end) {
    for (int i = end - 1; i >= start; i--) {
      if (array[i] == target) {
        return i;
      }
    }
    return -1;
  }

  /**
   * Returns the least value present in {@code array}.
   *
   * @param array a <i>nonempty</i> array of {@code int} values
   * @return the value present in {@code array} that is less than or equal to
   *     every other value in the array
   * @throws IllegalArgumentException if {@code array} is empty
   */
  public static int min(int... array) {
    checkArgument(array.length > 0);
    int min = array[0];
    for (int i = 1; i < array.length; i++) {
      if (array[i] < min) {
        min = array[i];
      }
    }
    return min;
  }

  /**
   * Returns the greatest value present in {@code array}.
   *
   * @param array a <i>nonempty</i> array of {@code int} values
   * @return the value present in {@code array} that is greater than or equal to
   *     every other value in the array
   * @throws IllegalArgumentException if {@code array} is empty
   */
  public static int max(int... array) {
    checkArgument(array.length > 0);
    int max = array[0];
    for (int i = 1; i < array.length; i++) {
      if (array[i] > max) {
        max = array[i];
      }
    }
    return max;
  }

  /**
   * Returns the values from each provided array combined into a single array.
   * For example, {@code concat(new int[] {a, b}, new int[] {}, new
   * int[] {c}} returns the array {@code {a, b, c}}.
   *
   * @param arrays zero or more {@code int} arrays
   * @return a single array containing all the values from the source arrays, in
   *     order
   */
  public static int[] concat(int[]... arrays) {
    int length = 0;
    for (int[] array : arrays) {
      length += array.length;
    }
    int[] result = new int[length];
    int pos = 0;
    for (int[] array : arrays) {
      System.arraycopy(array, 0, result, pos, array.length);
      pos += array.length;
    }
    return result;
  }

  private static final class IntConverter
      extends Converter<String, Integer> implements Serializable {
    static final IntConverter INSTANCE = new IntConverter();

    @Override
    protected Integer doForward(String value) {
      return Integer.decode(value);
    }

    @Override
    protected String doBackward(Integer value) {
      return value.toString();
    }

    @Override
    public String toString() {
      return "Ints.stringConverter()";
    }

    private Object readResolve() {
      return INSTANCE;
    }
    private static final long serialVersionUID = 1;
  }

  /**
   * Returns a serializable converter object that converts between strings and
   * integers using {@link Integer#decode} and {@link Integer#toString()}.
   *
   * @since 16.0
   */
  @Beta
  public static Converter<String, Integer> stringConverter() {
    return IntConverter.INSTANCE;
  }

  /**
   * Returns an array containing the same values as {@code array}, but
   * guaranteed to be of a specified minimum length. If {@code array} already
   * has a length of at least {@code minLength}, it is returned directly.
   * Otherwise, a new array of size {@code minLength + padding} is returned,
   * containing the values of {@code array}, and zeroes in the remaining places.
   *
   * @param array the source array
   * @param minLength the minimum length the returned array must guarantee
   * @param padding an extra amount to "grow" the array by if growth is
   *     necessary
   * @throws IllegalArgumentException if {@code minLength} or {@code padding} is
   *     negative
   * @return an array containing the values of {@code array}, with guaranteed
   *     minimum length {@code minLength}
   */
  public static int[] ensureCapacity(
      int[] array, int minLength, int padding) {
    checkArgument(minLength >= 0, "Invalid minLength: %s", minLength);
    checkArgument(padding >= 0, "Invalid padding: %s", padding);
    return (array.length < minLength)
        ? copyOf(array, minLength + padding)
        : array;
  }

  // Arrays.copyOf() requires Java 6
  private static int[] copyOf(int[] original, int length) {
    int[] copy = new int[length];
    System.arraycopy(original, 0, copy, 0, Math.min(original.length, length));
    return copy;
  }

  /**
   * Returns a string containing the supplied {@code int} values separated
   * by {@code separator}. For example, {@code join("-", 1, 2, 3)} returns
   * the string {@code "1-2-3"}.
   *
   * @param separator the text that should appear between consecutive values in
   *     the resulting string (but not at the start or end)
   * @param array an array of {@code int} values, possibly empty
   */
  public static String join(String separator, int... array) {
    checkNotNull(separator);
    if (array.length == 0) {
      return "";
    }

    // For pre-sizing a builder, just get the right order of magnitude
    StringBuilder builder = new StringBuilder(array.length * 5);
    builder.append(array[0]);
    for (int i = 1; i < array.length; i++) {
      builder.append(separator).append(array[i]);
    }
    return builder.toString();
  }

  /**
   * Returns a comparator that compares two {@code int} arrays
   * lexicographically. That is, it compares, using {@link
   * #compare(int, int)}), the first pair of values that follow any
   * common prefix, or when one array is a prefix of the other, treats the
   * shorter array as the lesser. For example, {@code [] < [1] < [1, 2] < [2]}.
   *
   * <p>The returned comparator is inconsistent with {@link
   * Object#equals(Object)} (since arrays support only identity equality), but
   * it is consistent with {@link Arrays#equals(int[], int[])}.
   *
   * @see <a href="http://en.wikipedia.org/wiki/Lexicographical_order">
   *     Lexicographical order article at Wikipedia</a>
   * @since 2.0
   */
  public static Comparator<int[]> lexicographicalComparator() {
    return LexicographicalComparator.INSTANCE;
  }

  private enum LexicographicalComparator implements Comparator<int[]> {
    INSTANCE;

    @Override
    public int compare(int[] left, int[] right) {
      int minLength = Math.min(left.length, right.length);
      for (int i = 0; i < minLength; i++) {
        int result = Ints.compare(left[i], right[i]);
        if (result != 0) {
          return result;
        }
      }
      return left.length - right.length;
    }
  }

  /**
   * Returns an array containing each value of {@code collection}, converted to
   * a {@code int} value in the manner of {@link Number#intValue}.
   *
   * <p>Elements are copied from the argument collection as if by {@code
   * collection.toArray()}.  Calling this method is as thread-safe as calling
   * that method.
   *
   * @param collection a collection of {@code Number} instances
   * @return an array containing the same values as {@code collection}, in the
   *     same order, converted to primitives
   * @throws NullPointerException if {@code collection} or any of its elements
   *     is null
   * @since 1.0 (parameter was {@code Collection<Integer>} before 12.0)
   */
  public static int[] toArray(Collection<? extends Number> collection) {
    if (collection instanceof IntArrayAsList) {
      return ((IntArrayAsList) collection).toIntArray();
    }

    Object[] boxedArray = collection.toArray();
    int len = boxedArray.length;
    int[] array = new int[len];
    for (int i = 0; i < len; i++) {
      // checkNotNull for GWT (do not optimize)
      array[i] = ((Number) checkNotNull(boxedArray[i])).intValue();
    }
    return array;
  }

  /**
   * Returns a fixed-size list backed by the specified array, similar to {@link
   * Arrays#asList(Object[])}. The list supports {@link List#set(int, Object)},
   * but any attempt to set a value to {@code null} will result in a {@link
   * NullPointerException}.
   *
   * <p>The returned list maintains the values, but not the identities, of
   * {@code Integer} objects written to or read from it.  For example, whether
   * {@code list.get(0) == list.get(0)} is true for the returned list is
   * unspecified.
   *
   * @param backingArray the array to back the list
   * @return a list view of the array
   */
  public static List<Integer> asList(int... backingArray) {
    if (backingArray.length == 0) {
      return Collections.emptyList();
    }
    return new IntArrayAsList(backingArray);
  }

  @GwtCompatible
  private static class IntArrayAsList extends AbstractList<Integer>
      implements RandomAccess, Serializable {
    final int[] array;
    final int start;
    final int end;

    IntArrayAsList(int[] array) {
      this(array, 0, array.length);
    }

    IntArrayAsList(int[] array, int start, int end) {
      this.array = array;
      this.start = start;
      this.end = end;
    }

    @Override public int size() {
      return end - start;
    }

    @Override public boolean isEmpty() {
      return false;
    }

    @Override public Integer get(int index) {
      checkElementIndex(index, size());
      return array[start + index];
    }

    @Override public boolean contains(Object target) {
      // Overridden to prevent a ton of boxing
      return (target instanceof Integer)
          && Ints.indexOf(array, (Integer) target, start, end) != -1;
    }

    @Override public int indexOf(Object target) {
      // Overridden to prevent a ton of boxing
      if (target instanceof Integer) {
        int i = Ints.indexOf(array, (Integer) target, start, end);
        if (i >= 0) {
          return i - start;
        }
      }
      return -1;
    }

    @Override public int lastIndexOf(Object target) {
      // Overridden to prevent a ton of boxing
      if (target instanceof Integer) {
        int i = Ints.lastIndexOf(array, (Integer) target, start, end);
        if (i >= 0) {
          return i - start;
        }
      }
      return -1;
    }

    @Override public Integer set(int index, Integer element) {
      checkElementIndex(index, size());
      int oldValue = array[start + index];
      // checkNotNull for GWT (do not optimize)
      array[start + index] = checkNotNull(element);
      return oldValue;
    }

    @Override public List<Integer> subList(int fromIndex, int toIndex) {
      int size = size();
      checkPositionIndexes(fromIndex, toIndex, size);
      if (fromIndex == toIndex) {
        return Collections.emptyList();
      }
      return new IntArrayAsList(array, start + fromIndex, start + toIndex);
    }

    @Override public boolean equals(Object object) {
      if (object == this) {
        return true;
      }
      if (object instanceof IntArrayAsList) {
        IntArrayAsList that = (IntArrayAsList) object;
        int size = size();
        if (that.size() != size) {
          return false;
        }
        for (int i = 0; i < size; i++) {
          if (array[start + i] != that.array[that.start + i]) {
            return false;
          }
        }
        return true;
      }
      return super.equals(object);
    }

    @Override public int hashCode() {
      int result = 1;
      for (int i = start; i < end; i++) {
        result = 31 * result + Ints.hashCode(array[i]);
      }
      return result;
    }

    @Override public String toString() {
      StringBuilder builder = new StringBuilder(size() * 5);
      builder.append('[').append(array[start]);
      for (int i = start + 1; i < end; i++) {
        builder.append(", ").append(array[i]);
      }
      return builder.append(']').toString();
    }

    int[] toIntArray() {
      // Arrays.copyOfRange() is not available under GWT
      int size = size();
      int[] result = new int[size];
      System.arraycopy(array, start, result, 0, size);
      return result;
    }

    private static final long serialVersionUID = 0;
  }

  private static final byte[] asciiDigits = new byte[128];

  static {
    Arrays.fill(asciiDigits, (byte) -1);
    for (int i = 0; i <= 9; i++) {
      asciiDigits['0' + i] = (byte) i;
    }
    for (int i = 0; i <= 26; i++) {
      asciiDigits['A' + i] = (byte) (10 + i);
      asciiDigits['a' + i] = (byte) (10 + i);
    }
  }

  private static int digit(char c) {
    return (c < 128) ? asciiDigits[c] : -1;
  }

  /**
   * Parses the specified string as a signed decimal integer value. The ASCII
   * character {@code '-'} (<code>'&#92;u002D'</code>) is recognized as the
   * minus sign.
   *
   * <p>Unlike {@link Integer#parseInt(String)}, this method returns
   * {@code null} instead of throwing an exception if parsing fails.
   * Additionally, this method only accepts ASCII digits, and returns
   * {@code null} if non-ASCII digits are present in the string.
   *
   * <p>Note that strings prefixed with ASCII {@code '+'} are rejected, even
   * under JDK 7, despite the change to {@link Integer#parseInt(String)} for
   * that version.
   *
   * @param string the string representation of an integer value
   * @return the integer value represented by {@code string}, or {@code null} if
   *     {@code string} has a length of zero or cannot be parsed as an integer
   *     value
   * @since 11.0
   */
  @Beta
  @CheckForNull
  public static Integer tryParse(String string) {
    return tryParse(string, 10);
  }

  /**
   * Parses the specified string as a signed integer value using the specified
   * radix. The ASCII character {@code '-'} (<code>'&#92;u002D'</code>) is
   * recognized as the minus sign.
   *
   * <p>Unlike {@link Integer#parseInt(String, int)}, this method returns
   * {@code null} instead of throwing an exception if parsing fails.
   * Additionally, this method only accepts ASCII digits, and returns
   * {@code null} if non-ASCII digits are present in the string.
   *
   * <p>Note that strings prefixed with ASCII {@code '+'} are rejected, even
   * under JDK 7, despite the change to {@link Integer#parseInt(String, int)}
   * for that version.
   *
   * @param string the string representation of an integer value
   * @param radix the radix to use when parsing
   * @return the integer value represented by {@code string} using
   *     {@code radix}, or {@code null} if {@code string} has a length of zero
   *     or cannot be parsed as an integer value
   * @throws IllegalArgumentException if {@code radix < Character.MIN_RADIX} or
   *     {@code radix > Character.MAX_RADIX}
   */
  @CheckForNull static Integer tryParse(
      String string, int radix) {
    if (checkNotNull(string).isEmpty()) {
      return null;
    }
    if (radix < Character.MIN_RADIX || radix > Character.MAX_RADIX) {
      throw new IllegalArgumentException(
          "radix must be between MIN_RADIX and MAX_RADIX but was " + radix);
    }
    boolean negative = string.charAt(0) == '-';
    int index = negative ? 1 : 0;
    if (index == string.length()) {
      return null;
    }
    int digit = digit(string.charAt(index++));
    if (digit < 0 || digit >= radix) {
      return null;
    }
    int accum = -digit;

    int cap = Integer.MIN_VALUE / radix;

    while (index < string.length()) {
      digit = digit(string.charAt(index++));
      if (digit < 0 || digit >= radix || accum < cap) {
        return null;
      }
      accum *= radix;
      if (accum < Integer.MIN_VALUE + digit) {
        return null;
      }
      accum -= digit;
    }

    if (negative) {
      return accum;
    } else if (accum == Integer.MIN_VALUE) {
      return null;
    } else {
      return -accum;
    }
  }
}