StringUtils.java

package com.deardhruv.swipevolley.utils;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Collection;
import java.util.List;

public class StringUtils {
	public static final String EMPTY = "";

	public static String join(List<String> list, String separator) {
		if (list == null) {
			return null;
		}

		return join(list.toArray(), separator, 0, list.size());
	}

	public static String join(Object[] array, String separator) {
		if (array == null) {
			return null;
		}
		return join(array, separator, 0, array.length);
	}

	public static String join(Collection<String> collection, String separator) {
		if (collection == null) {
			return null;
		}

		return join(collection.toArray(new String[collection.size()]), separator, 0,
				collection.size());
	}

	public static String join(final Object[] array, String separator, final int startIndex,
			final int endIndex) {
		if (array == null) {
			return null;
		}
		if (separator == null) {
			separator = EMPTY;
		}

		final int noOfItems = endIndex - startIndex;
		if (noOfItems <= 0) {
			return EMPTY;
		}

		final StringBuilder buf = new StringBuilder(noOfItems * 16);

		for (int i = startIndex; i < endIndex; i++) {
			if (i > startIndex) {
				buf.append(separator);
			}
			if (array[i] != null) {
				buf.append(array[i]);
			}
		}
		return buf.toString();
	}

	final protected static char[] hexArray = "0123456789abcdef".toCharArray();

	public static String encodeHexString(byte[] bytes) {
		char[] hexChars = new char[bytes.length * 2];
		for (int j = 0; j < bytes.length; j++) {
			int v = bytes[j] & 0xFF;
			hexChars[j * 2] = hexArray[v >>> 4];
			hexChars[j * 2 + 1] = hexArray[v & 0x0F];
		}
		return new String(hexChars);
	}

	public static String escapeHtml(String input) {
		return HtmlEscape.escape(input);
	}

	public static boolean isNotBlank(Object input) {
		if (input == null)
			return false;
		return !isBlank(input.toString());
	}

	public static boolean isNotBlank(String input) {
		return !isBlank(input);
	}

	public static boolean isEmpty(String input) {
		if (input == null || input.length() == 0) {
			return true;
		}
		return false;
	}

	public static boolean isBlank(String input) {
		int strLen;
		if (input == null || (strLen = input.length()) == 0) {
			return true;
		}
		for (int i = 0; i < strLen; i++) {
			if (Character.isWhitespace(input.charAt(i)) == false) {
				return false;
			}
		}
		return true;
	}

	public static String read(InputStream in) throws IOException {
		ByteArrayOutputStream baos = new ByteArrayOutputStream();
		byte[] buffer = new byte[1024];
		int length = 0;
		while ((length = in.read(buffer)) != -1) {
			baos.write(buffer, 0, length);
		}
		return new String(baos.toByteArray());
	}

}