StringUtil.java

package org.skylion.mangareader.util;

import java.io.IOException;
import java.io.Reader;
import java.net.URL;
import java.net.URLConnection;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

/**
 * Utility class that houses commonly used methods for String parsing
 * @author Skylion
 */
public final class StringUtil {

	private StringUtil(){};//Prevents instantiation
	
	/**
	 * Checks if it contains a number
	 * @param input The String you want to check
	 * @return True if it does, false otherwise
	 */
	public static boolean containsNum(String input){
		for(char c: input.toCharArray()){
			if(Character.isDigit(c)){
				return true;
			}
		}
		return false;
	}
	
	/**
	 * Checks if the number is parsable into a int or double (contains only num)
	 * @param input
	 * @return
	 */
	public static boolean isNum(String input){
		for(char c: input.toCharArray()){
			if(!Character.isDigit(c) || c!='.'){//Special case for decimals
				return false;
			}
		}
		return true;
	}
	
	public static boolean isValidCharacter(char input){
		char[] validChar ="abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ-._~:/?#[]@!$&'()*+,;=;"
				.toCharArray();
		for(char c: validChar){
			if(c == input){
				return true;
			}
		}
		return false;
	}
	
	/**
	 * Removes trailing white spaces from a String
	 * @param input The String you want to modify
	 * @return
	 */
	public static String removeTrailingWhiteSpaces(String input){
		while(input.length()>=1 && input.charAt(input.length()-1)==' '){//Removes trailing whitespaces
			input = input.substring(0,input.length()-1);
		}
		return input;
	}
	
	public static String[] formatChapterNames(String[] input){
		for(int i = 0; i<input.length; i++){
			input[i] = formatChapterNames(input[i]);
		}
		return input;
	}
	
	
	public static String formatChapterNames(String input){
		input = removeTrailingWhiteSpaces(input);
		input = input.substring(input.lastIndexOf(' ')+1);
		return "Ch: " + input;
	}
	
	public static String titleCase(String realName) {
	    String space = " ";
	    String[] names = realName.split(space);
	    StringBuilder b = new StringBuilder();
	    for (String name : names) {
	        if (name == null || name.isEmpty()) {
	            b.append(space);
	            continue;
	        }
	        b.append(name.substring(0, 1).toUpperCase())
	                .append(name.substring(1).toLowerCase())
	                .append(space);
	    }
	    return b.toString();
	}

	/**
	 * Determines the index of the String in the an array of Strings
	 * @param input The array you want to search through
	 * @param searchTerm The String you want to search
	 * @return The index of the searchTerm in the input or -1 if it is not found.
	 */
	public static int indexOf(String[] input, String searchTerm){
		for(int i = 0; i<input.length; i++){
			if(searchTerm.equals(input[i])){
				return i;
			}
		}
		return -1;
	}
	
	/**
	 * Downloads the text from a specified URL
	 * @param url The URL you want to get the text from.
	 * @return The downloaded text
	 * @throws IOException If something went wrong
	 */
	public static String urlToText(String url) throws IOException{
		return urlToText(new URL(url));
	}
	
	/**
	 * Downloads the text from the specified URL
	 * @param url The URL you want to get the text from
	 * @return The downloaded text.
	 * @throws IOException If something went wrong
	 */
	public static String urlToText(URL url) throws IOException{
		URLConnection urlConn = url.openConnection(); //Open connection
		Reader r = new java.io.InputStreamReader(urlConn.getInputStream(), Charset.forName("UTF-8"));//Gets Data Converts to string
		StringBuilder buf = new StringBuilder();
		while (true) {//Reads String from buffer
			int ch = r.read();
			if (ch < 0)
				break;
			buf.append((char) ch);
		}
		String str = buf.toString();
		r.close();
		return str;
	}

	/**
	 * Converts a collection of Strings into one long String.
	 * @param collection The collection you want to get the String from
	 * @return The String generated from the collection
	 */
	public static String concatCollection(Collection<String> collection){
		StringBuilder sb = new StringBuilder(collection.size());
		for(String s: collection){
			sb.append(String.valueOf(s));
		}
		return sb.toString();
	}
	
	/**
	 * Removes null entries from an array of Strings
	 * @param strs The String you want to remove the null entries from
	 * @return The cleaned array
	 */
	public static String[] cleanArray(String[] strs){
	    List<String> list = new ArrayList<String>();
	    for(String s : strs) {
	       if(s != null && s.length() > 0) {
	          list.add(s);
	       }
	    }
	    return list.toArray(new String[list.size()]);
	}
	
	/**
	 * Strips the quotes and gets the text between them
	 * @param input The String
	 * @return The stripped String
	 */
	public static String stripQuotes(String input){
		return input.substring(input.indexOf('"')+1, input.lastIndexOf('"'));
	}

}