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/** * Searches the specified array of chars for the specified value using the * binary search algorithm. The array must be sorted (as * by the {@link #sort(char[])} method) prior to making this call. If it * is not sorted, the results are undefined. If the array contains * multiple elements with the specified value, there is no guarantee which * one will be found. * * @param a the array to be searched * @param key the value to be searched for * @return index of the search key, if it is contained in the array; * otherwise, <tt>(-(<i>insertion point</i>) - 1)</tt>. The * <i>insertion point</i> is defined as the point at which the * key would be inserted into the array: the index of the first * element greater than the key, or <tt>a.length</tt> if all * elements in the array are less than the specified key. Note * that this guarantees that the return value will be >= 0 if * and only if the key is found. */ public static int binarySearch(char[] a, char key) { return binarySearch0(a, 0, a.length, key); }

/** * Searches the specified array of shorts for the specified value using * the binary search algorithm. The array must be sorted * (as by the {@link #sort(short[])} method) prior to making this call. If * it is not sorted, the results are undefined. If the array contains * multiple elements with the specified value, there is no guarantee which * one will be found. * * @param a the array to be searched * @param key the value to be searched for * @return index of the search key, if it is contained in the array; * otherwise, <tt>(-(<i>insertion point</i>) - 1)</tt>. The * <i>insertion point</i> is defined as the point at which the * key would be inserted into the array: the index of the first * element greater than the key, or <tt>a.length</tt> if all * elements in the array are less than the specified key. Note * that this guarantees that the return value will be >= 0 if * and only if the key is found. */ public static int binarySearch(short[] a, short key) { return binarySearch0(a, 0, a.length, key); }

/** * Searches the specified array of ints for the specified value using the * binary search algorithm. The array must be sorted (as * by the {@link #sort(int[])} method) prior to making this call. If it * is not sorted, the results are undefined. If the array contains * multiple elements with the specified value, there is no guarantee which * one will be found. * * @param a the array to be searched * @param key the value to be searched for * @return index of the search key, if it is contained in the array; * otherwise, <tt>(-(<i>insertion point</i>) - 1)</tt>. The * <i>insertion point</i> is defined as the point at which the * key would be inserted into the array: the index of the first * element greater than the key, or <tt>a.length</tt> if all * elements in the array are less than the specified key. Note * that this guarantees that the return value will be >= 0 if * and only if the key is found. */ public static int binarySearch(int[] a, int key) { return binarySearch0(a, 0, a.length, key); }

/** * Searches the specified array of longs for the specified value using the * binary search algorithm. The array must be sorted (as * by the {@link #sort(long[])} method) prior to making this call. If it * is not sorted, the results are undefined. If the array contains * multiple elements with the specified value, there is no guarantee which * one will be found. * * @param a the array to be searched * @param key the value to be searched for * @return index of the search key, if it is contained in the array; * otherwise, <tt>(-(<i>insertion point</i>) - 1)</tt>. The * <i>insertion point</i> is defined as the point at which the * key would be inserted into the array: the index of the first * element greater than the key, or <tt>a.length</tt> if all * elements in the array are less than the specified key. Note * that this guarantees that the return value will be >= 0 if * and only if the key is found. */ public static int binarySearch(long[] a, long key) { return binarySearch0(a, 0, a.length, key); }

/** * Searches the specified array of floats for the specified value using * the binary search algorithm. The array must be sorted * (as by the {@link #sort(float[])} method) prior to making this call. If * it is not sorted, the results are undefined. If the array contains * multiple elements with the specified value, there is no guarantee which * one will be found. This method considers all NaN values to be * equivalent and equal. * * @param a the array to be searched * @param key the value to be searched for * @return index of the search key, if it is contained in the array; * otherwise, <tt>(-(<i>insertion point</i>) - 1)</tt>. The * <i>insertion point</i> is defined as the point at which the * key would be inserted into the array: the index of the first * element greater than the key, or <tt>a.length</tt> if all * elements in the array are less than the specified key. Note * that this guarantees that the return value will be >= 0 if * and only if the key is found. */ public static int binarySearch(float[] a, float key) { return binarySearch0(a, 0, a.length, key); }

/** * Searches the specified array of doubles for the specified value using * the binary search algorithm. The array must be sorted * (as by the {@link #sort(double[])} method) prior to making this call. * If it is not sorted, the results are undefined. If the array contains * multiple elements with the specified value, there is no guarantee which * one will be found. This method considers all NaN values to be * equivalent and equal. * * @param a the array to be searched * @param key the value to be searched for * @return index of the search key, if it is contained in the array; * otherwise, <tt>(-(<i>insertion point</i>) - 1)</tt>. The * <i>insertion point</i> is defined as the point at which the * key would be inserted into the array: the index of the first * element greater than the key, or <tt>a.length</tt> if all * elements in the array are less than the specified key. Note * that this guarantees that the return value will be >= 0 if * and only if the key is found. */ public static int binarySearch(double[] a, double key) { return binarySearch0(a, 0, a.length, key); }

/** * Searches the specified array of shorts for the specified value using * the binary search algorithm. The array must be sorted * (as by the {@link #sort(short[])} method) prior to making this call. If * it is not sorted, the results are undefined. If the array contains * multiple elements with the specified value, there is no guarantee which * one will be found. * * @param a the array to be searched * @param key the value to be searched for * @return index of the search key, if it is contained in the array; * otherwise, <tt>(-(<i>insertion point</i>) - 1)</tt>. The * <i>insertion point</i> is defined as the point at which the * key would be inserted into the array: the index of the first * element greater than the key, or <tt>a.length</tt> if all * elements in the array are less than the specified key. Note * that this guarantees that the return value will be >= 0 if * and only if the key is found. */ public static int binarySearch(short[] a, short key) { return binarySearch0(a, 0, a.length, key); }

/** * Searches the specified array of bytes for the specified value using the * binary search algorithm. The array must be sorted (as * by the {@link #sort(byte[])} method) prior to making this call. If it * is not sorted, the results are undefined. If the array contains * multiple elements with the specified value, there is no guarantee which * one will be found. * * @param a the array to be searched * @param key the value to be searched for * @return index of the search key, if it is contained in the array; * otherwise, <tt>(-(<i>insertion point</i>) - 1)</tt>. The * <i>insertion point</i> is defined as the point at which the * key would be inserted into the array: the index of the first * element greater than the key, or <tt>a.length</tt> if all * elements in the array are less than the specified key. Note * that this guarantees that the return value will be >= 0 if * and only if the key is found. */ public static int binarySearch(byte[] a, byte key) { return binarySearch0(a, 0, a.length, key); }

/** * Searches the specified array of bytes for the specified value using the * binary search algorithm. The array must be sorted (as * by the {@link #sort(byte[])} method) prior to making this call. If it * is not sorted, the results are undefined. If the array contains * multiple elements with the specified value, there is no guarantee which * one will be found. * * @param a the array to be searched * @param key the value to be searched for * @return index of the search key, if it is contained in the array; * otherwise, <tt>(-(<i>insertion point</i>) - 1)</tt>. The * <i>insertion point</i> is defined as the point at which the * key would be inserted into the array: the index of the first * element greater than the key, or <tt>a.length</tt> if all * elements in the array are less than the specified key. Note * that this guarantees that the return value will be >= 0 if * and only if the key is found. */ public static int binarySearch(byte[] a, byte key) { return binarySearch0(a, 0, a.length, key); }

/** * Searches the specified array of floats for the specified value using * the binary search algorithm. The array must be sorted * (as by the {@link #sort(float[])} method) prior to making this call. If * it is not sorted, the results are undefined. If the array contains * multiple elements with the specified value, there is no guarantee which * one will be found. This method considers all NaN values to be * equivalent and equal. * * @param a the array to be searched * @param key the value to be searched for * @return index of the search key, if it is contained in the array; * otherwise, <tt>(-(<i>insertion point</i>) - 1)</tt>. The * <i>insertion point</i> is defined as the point at which the * key would be inserted into the array: the index of the first * element greater than the key, or <tt>a.length</tt> if all * elements in the array are less than the specified key. Note * that this guarantees that the return value will be >= 0 if * and only if the key is found. */ public static int binarySearch(float[] a, float key) { return binarySearch0(a, 0, a.length, key); }

/** * Searches the specified array of floats for the specified value using * the binary search algorithm. The array must be sorted * (as by the {@link #sort(float[])} method) prior to making this call. If * it is not sorted, the results are undefined. If the array contains * multiple elements with the specified value, there is no guarantee which * one will be found. This method considers all NaN values to be * equivalent and equal. * * @param a the array to be searched * @param key the value to be searched for * @return index of the search key, if it is contained in the array; * otherwise, <tt>(-(<i>insertion point</i>) - 1)</tt>. The * <i>insertion point</i> is defined as the point at which the * key would be inserted into the array: the index of the first * element greater than the key, or <tt>a.length</tt> if all * elements in the array are less than the specified key. Note * that this guarantees that the return value will be >= 0 if * and only if the key is found. */ public static int binarySearch(float[] a, float key) { return binarySearch0(a, 0, a.length, key); }

/** * Searches the specified array of ints for the specified value using the * binary search algorithm. The array must be sorted (as * by the {@link #sort(int[])} method) prior to making this call. If it * is not sorted, the results are undefined. If the array contains * multiple elements with the specified value, there is no guarantee which * one will be found. * * @param a the array to be searched * @param key the value to be searched for * @return index of the search key, if it is contained in the array; * otherwise, <tt>(-(<i>insertion point</i>) - 1)</tt>. The * <i>insertion point</i> is defined as the point at which the * key would be inserted into the array: the index of the first * element greater than the key, or <tt>a.length</tt> if all * elements in the array are less than the specified key. Note * that this guarantees that the return value will be >= 0 if * and only if the key is found. */ public static int binarySearch(int[] a, int key) { return binarySearch0(a, 0, a.length, key); }

/** * Searches the specified array of chars for the specified value using the * binary search algorithm. The array must be sorted (as * by the {@link #sort(char[])} method) prior to making this call. If it * is not sorted, the results are undefined. If the array contains * multiple elements with the specified value, there is no guarantee which * one will be found. * * @param a the array to be searched * @param key the value to be searched for * @return index of the search key, if it is contained in the array; * otherwise, <tt>(-(<i>insertion point</i>) - 1)</tt>. The * <i>insertion point</i> is defined as the point at which the * key would be inserted into the array: the index of the first * element greater than the key, or <tt>a.length</tt> if all * elements in the array are less than the specified key. Note * that this guarantees that the return value will be >= 0 if * and only if the key is found. */ public static int binarySearch(char[] a, char key) { return binarySearch0(a, 0, a.length, key); }

/** * Searches the specified array of bytes for the specified value using the * binary search algorithm. The array must be sorted (as * by the {@link #sort(byte[])} method) prior to making this call. If it * is not sorted, the results are undefined. If the array contains * multiple elements with the specified value, there is no guarantee which * one will be found. * * @param a the array to be searched * @param key the value to be searched for * @return index of the search key, if it is contained in the array; * otherwise, <tt>(-(<i>insertion point</i>) - 1)</tt>. The * <i>insertion point</i> is defined as the point at which the * key would be inserted into the array: the index of the first * element greater than the key, or <tt>a.length</tt> if all * elements in the array are less than the specified key. Note * that this guarantees that the return value will be >= 0 if * and only if the key is found. */ public static int binarySearch(byte[] a, byte key) { return binarySearch0(a, 0, a.length, key); }

/** * Searches the specified array of ints for the specified value using the * binary search algorithm. The array must be sorted (as * by the {@link #sort(int[])} method) prior to making this call. If it * is not sorted, the results are undefined. If the array contains * multiple elements with the specified value, there is no guarantee which * one will be found. * * @param a the array to be searched * @param key the value to be searched for * @return index of the search key, if it is contained in the array; * otherwise, <tt>(-(<i>insertion point</i>) - 1)</tt>. The * <i>insertion point</i> is defined as the point at which the * key would be inserted into the array: the index of the first * element greater than the key, or <tt>a.length</tt> if all * elements in the array are less than the specified key. Note * that this guarantees that the return value will be >= 0 if * and only if the key is found. */ public static int binarySearch(int[] a, int key) { return binarySearch0(a, 0, a.length, key); }

/** * Searches the specified array of shorts for the specified value using * the binary search algorithm. The array must be sorted * (as by the {@link #sort(short[])} method) prior to making this call. If * it is not sorted, the results are undefined. If the array contains * multiple elements with the specified value, there is no guarantee which * one will be found. * * @param a the array to be searched * @param key the value to be searched for * @return index of the search key, if it is contained in the array; * otherwise, <tt>(-(<i>insertion point</i>) - 1)</tt>. The * <i>insertion point</i> is defined as the point at which the * key would be inserted into the array: the index of the first * element greater than the key, or <tt>a.length</tt> if all * elements in the array are less than the specified key. Note * that this guarantees that the return value will be >= 0 if * and only if the key is found. */ public static int binarySearch(short[] a, short key) { return binarySearch0(a, 0, a.length, key); }

/** * Searches the specified array of longs for the specified value using the * binary search algorithm. The array must be sorted (as * by the {@link #sort(long[])} method) prior to making this call. If it * is not sorted, the results are undefined. If the array contains * multiple elements with the specified value, there is no guarantee which * one will be found. * * @param a the array to be searched * @param key the value to be searched for * @return index of the search key, if it is contained in the array; * otherwise, <tt>(-(<i>insertion point</i>) - 1)</tt>. The * <i>insertion point</i> is defined as the point at which the * key would be inserted into the array: the index of the first * element greater than the key, or <tt>a.length</tt> if all * elements in the array are less than the specified key. Note * that this guarantees that the return value will be >= 0 if * and only if the key is found. */ public static int binarySearch(long[] a, long key) { return binarySearch0(a, 0, a.length, key); }

private static <T> int binarySearch0(T[] a, int fromIndex, int toIndex, T key, Comparator<? super T> c) { if (c == null) { return binarySearch0(a, fromIndex, toIndex, key); } int low = fromIndex; int high = toIndex - 1; while (low <= high) { int mid = (low + high) >>> 1; T midVal = a[mid]; int cmp = c.compare(midVal, key); if (cmp < 0) low = mid + 1; else if (cmp > 0) high = mid - 1; else return mid; // key found } return -(low + 1); // key not found. }

private static <T> int binarySearch0(T[] a, int fromIndex, int toIndex, T key, Comparator<? super T> c) { if (c == null) { return binarySearch0(a, fromIndex, toIndex, key); } int low = fromIndex; int high = toIndex - 1; while (low <= high) { int mid = (low + high) >>> 1; T midVal = a[mid]; int cmp = c.compare(midVal, key); if (cmp < 0) low = mid + 1; else if (cmp > 0) high = mid - 1; else return mid; // key found } return -(low + 1); // key not found. }

private static <T> int binarySearch0(T[] a, int fromIndex, int toIndex, T key, Comparator<? super T> c) { if (c == null) { return binarySearch0(a, fromIndex, toIndex, key); } int low = fromIndex; int high = toIndex - 1; while (low <= high) { int mid = (low + high) >>> 1; T midVal = a[mid]; int cmp = c.compare(midVal, key); if (cmp < 0) low = mid + 1; else if (cmp > 0) high = mid - 1; else return mid; // key found } return -(low + 1); // key not found. }