com.WazaBe.HoloEverywhere.util.CharSequences Maven / Gradle / Ivy

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package com.WazaBe.HoloEverywhere.util;

public class CharSequences {
	public static int compareToIgnoreCase(CharSequence me, CharSequence another) {
		int myLen = me.length(), anotherLen = another.length();
		int myPos = 0, anotherPos = 0, result;
		int end = myLen < anotherLen ? myLen : anotherLen;
		while (myPos < end) {
			if ((result = Character.toLowerCase(me.charAt(myPos++))
					- Character.toLowerCase(another.charAt(anotherPos++))) != 0) {
				return result;
			}
		}
		return myLen - anotherLen;
	}

	public static boolean equals(CharSequence a, CharSequence b) {
		if (a.length() != b.length()) {
			return false;
		}
		int length = a.length();
		for (int i = 0; i < length; i++) {
			if (a.charAt(i) != b.charAt(i)) {
				return false;
			}
		}
		return true;
	}

	public static CharSequence forAsciiBytes(final byte[] bytes) {
		return new CharSequence() {
			@Override
			public char charAt(int index) {
				return (char) bytes[index];
			}

			@Override
			public int length() {
				return bytes.length;
			}

			@Override
			public CharSequence subSequence(int start, int end) {
				return CharSequences.forAsciiBytes(bytes, start, end);
			}

			@Override
			public String toString() {
				return new String(bytes);
			}
		};
	}

	public static CharSequence forAsciiBytes(final byte[] bytes,
			final int start, final int end) {
		CharSequences.validate(start, end, bytes.length);
		return new CharSequence() {
			@Override
			public char charAt(int index) {
				return (char) bytes[index + start];
			}

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

			@Override
			public CharSequence subSequence(int newStart, int newEnd) {
				newStart -= start;
				newEnd -= start;
				CharSequences.validate(newStart, newEnd, length());
				return CharSequences.forAsciiBytes(bytes, newStart, newEnd);
			}

			@Override
			public String toString() {
				return new String(bytes, start, length());
			}
		};
	}

	static void validate(int start, int end, int length) {
		if (start < 0 || end < 0 || end > length || start > end) {
			throw new IndexOutOfBoundsException();
		}
	}
}