Initial Jack import.

Change-Id: I953cf0a520195a7187d791b2885848ad0d5a9b43

1 files changed, 275 insertions, 0 deletions

diff --git a/guava/src/com/google/common/primitives/UnsignedInts.java b/guava/src/com/google/common/primitives/UnsignedInts.java
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+/*
+ * Copyright (C) 2011 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.checkNotNull;
+
+import com.google.common.annotations.Beta;
+import com.google.common.annotations.GwtCompatible;
+
+import java.util.Arrays;
+import java.util.Comparator;
+
+/**
+ * Static utility methods pertaining to {@code int} primitives that interpret values as
+ * <i>unsigned</i> (that is, any negative value {@code x} is treated as the positive value
+ * {@code 2^32 + x}). The methods for which signedness is not an issue are in {@link Ints}, as well
+ * as signed versions of methods for which signedness is an issue.
+ *
+ * <p>In addition, this class provides several static methods for converting an {@code int} to a
+ * {@code String} and a {@code String} to an {@code int} that treat the {@code int} as an unsigned
+ * number.
+ *
+ * <p>Users of these utilities must be <i>extremely careful</i> not to mix up signed and unsigned
+ * {@code int} values. When possible, it is recommended that the {@link UnsignedInteger} wrapper
+ * class be used, at a small efficiency penalty, to enforce the distinction in the type system.
+ *
+ * <p>See the Guava User Guide article on <a href=
+ * "http://code.google.com/p/guava-libraries/wiki/PrimitivesExplained#Unsigned_support">
+ * unsigned primitive utilities</a>.
+ *
+ * @author Louis Wasserman
+ * @since 11.0
+ */
+@Beta
+@GwtCompatible
+public final class UnsignedInts {
+  static final long INT_MASK = 0xffffffffL;
+
+  private UnsignedInts() {}
+
+  static int flip(int value) {
+    return value ^ Integer.MIN_VALUE;
+  }
+
+  /**
+   * Compares the two specified {@code int} values, treating them as unsigned values between
+   * {@code 0} and {@code 2^32 - 1} inclusive.
+   *
+   * @param a the first unsigned {@code int} to compare
+   * @param b the second unsigned {@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 Ints.compare(flip(a), flip(b));
+  }
+
+  /**
+   * Returns the value of the given {@code int} as a {@code long}, when treated as unsigned.
+   */
+  public static long toLong(int value) {
+    return value & INT_MASK;
+  }
+
+  /**
+   * Returns the least value present in {@code array}, treating values as unsigned.
+   *
+   * @param array a <i>nonempty</i> array of unsigned {@code int} values
+   * @return the value present in {@code array} that is less than or equal to every other value in
+   *         the array according to {@link #compare}
+   * @throws IllegalArgumentException if {@code array} is empty
+   */
+  public static int min(int... array) {
+    checkArgument(array.length > 0);
+    int min = flip(array[0]);
+    for (int i = 1; i < array.length; i++) {
+      int next = flip(array[i]);
+      if (next < min) {
+        min = next;
+      }
+    }
+    return flip(min);
+  }
+
+  /**
+   * Returns the greatest value present in {@code array}, treating values as unsigned.
+   *
+   * @param array a <i>nonempty</i> array of unsigned {@code int} values
+   * @return the value present in {@code array} that is greater than or equal to every other value
+   *         in the array according to {@link #compare}
+   * @throws IllegalArgumentException if {@code array} is empty
+   */
+  public static int max(int... array) {
+    checkArgument(array.length > 0);
+    int max = flip(array[0]);
+    for (int i = 1; i < array.length; i++) {
+      int next = flip(array[i]);
+      if (next > max) {
+        max = next;
+      }
+    }
+    return flip(max);
+  }
+
+  /**
+   * Returns a string containing the supplied unsigned {@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 unsigned {@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(toString(array[0]));
+    for (int i = 1; i < array.length; i++) {
+      builder.append(separator).append(toString(array[i]));
+    }
+    return builder.toString();
+  }
+
+  /**
+   * Returns a comparator that compares two arrays of unsigned {@code int} values 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] < [1 << 31]}.
+   *
+   * <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>
+   */
+  public static Comparator<int[]> lexicographicalComparator() {
+    return LexicographicalComparator.INSTANCE;
+  }
+
+  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++) {
+        if (left[i] != right[i]) {
+          return UnsignedInts.compare(left[i], right[i]);
+        }
+      }
+      return left.length - right.length;
+    }
+  }
+
+  /**
+   * Returns dividend / divisor, where the dividend and divisor are treated as unsigned 32-bit
+   * quantities.
+   *
+   * @param dividend the dividend (numerator)
+   * @param divisor the divisor (denominator)
+   * @throws ArithmeticException if divisor is 0
+   */
+  public static int divide(int dividend, int divisor) {
+    return (int) (toLong(dividend) / toLong(divisor));
+  }
+
+  /**
+   * Returns dividend % divisor, where the dividend and divisor are treated as unsigned 32-bit
+   * quantities.
+   *
+   * @param dividend the dividend (numerator)
+   * @param divisor the divisor (denominator)
+   * @throws ArithmeticException if divisor is 0
+   */
+  public static int remainder(int dividend, int divisor) {
+    return (int) (toLong(dividend) % toLong(divisor));
+  }
+
+  /**
+   * Returns the unsigned {@code int} value represented by the given string.
+   *
+   * Accepts a decimal, hexadecimal, or octal number given by specifying the following prefix:
+   *
+   * <ul>
+   * <li>{@code 0x}<i>HexDigits</i>
+   * <li>{@code 0X}<i>HexDigits</i>
+   * <li>{@code #}<i>HexDigits</i>
+   * <li>{@code 0}<i>OctalDigits</i>
+   * </ul>
+   *
+   * @throws NumberFormatException if the string does not contain a valid unsigned {@code int}
+   *         value
+   * @since 13.0
+   */
+  public static int decode(String stringValue) {
+    ParseRequest request = ParseRequest.fromString(stringValue);
+
+    try {
+      return parseUnsignedInt(request.rawValue, request.radix);
+    } catch (NumberFormatException e) {
+      NumberFormatException decodeException =
+          new NumberFormatException("Error parsing value: " + stringValue);
+      decodeException.initCause(e);
+      throw decodeException;
+    }
+  }
+
+  /**
+   * Returns the unsigned {@code int} value represented by the given decimal string.
+   *
+   * @throws NumberFormatException if the string does not contain a valid unsigned integer, or if
+   *         the value represented is too large to fit in an unsigned {@code int}.
+   * @throws NullPointerException if {@code s} is null
+   */
+  public static int parseUnsignedInt(String s) {
+    return parseUnsignedInt(s, 10);
+  }
+
+  /**
+   * Returns the unsigned {@code int} value represented by a string with the given radix.
+   *
+   * @param string the string containing the unsigned integer representation to be parsed.
+   * @param radix the radix to use while parsing {@code s}; must be between
+   *        {@link Character#MIN_RADIX} and {@link Character#MAX_RADIX}.
+   * @throws NumberFormatException if the string does not contain a valid unsigned {@code int}, or
+   *         if supplied radix is invalid.
+   */
+  public static int parseUnsignedInt(String string, int radix) {
+    checkNotNull(string);
+    long result = Long.parseLong(string, radix);
+    if ((result & INT_MASK) != result) {
+      throw new NumberFormatException("Input " + string + " in base " + radix
+          + " is not in the range of an unsigned integer");
+    }
+    return (int) result;
+  }
+
+  /**
+   * Returns a string representation of x, where x is treated as unsigned.
+   */
+  public static String toString(int x) {
+    return toString(x, 10);
+  }
+
+  /**
+   * Returns a string representation of {@code x} for the given radix, where {@code x} is treated
+   * as unsigned.
+   *
+   * @param x the value to convert to a string.
+   * @param radix the radix to use while working with {@code x}
+   * @throws IllegalArgumentException if {@code radix} is not between {@link Character#MIN_RADIX}
+   *         and {@link Character#MAX_RADIX}.
+   */
+  public static String toString(int x, int radix) {
+    long asLong = x & INT_MASK;
+    return Long.toString(asLong, radix);
+  }
+}