Cleans a String by reducing its contents to characters adhering to a reduced, single-case alphabet. - Java java.lang

Java examples for java.lang:String Trim

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Description

Cleans a String by reducing its contents to characters adhering to a reduced, single-case alphabet.

Demo Code


//package com.java2s;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.io.StringWriter;
import java.io.IOException;

import java.util.List;

public class Main {
    public static void main(String[] argv) {
        String string = "java2s.com";
        System.out.println(cleanAlphabet(string));
    }//from ww  w .  j ava2s  .  c om

    /**
     * The character used in listings of stories by letter where the letter
     * prefix is numeric.
     * 
     * @see cleanAlphabet
     */
    public final static char NON_ALPHABET_CHARACTER = '1';
    /**
     * This is just a convenience constant to avoid instantiating a String for
     * comparisons and such
     */
    public static final String EMPTY_STRING = "";

    /**
     * Cleans a String by reducing its contents to characters adhering to a
     * reduced, single-case alphabet. Valid characters in the returned String
     * will be between 'A' to 'Z' and NON_ALPHABET_CHARACTER. Invalid characters
     * will be replaced by NON_ALPHABET_CHARACTER.
     * 
     * @param s
     *            The String to clean.
     * @return A String rebuild in a reduced alphabet.
     */
    public static String cleanAlphabet(final String string) {
        String process = noNull(string).toUpperCase();
        StringBuffer clean = new StringBuffer(process.length());

        for (int i = 0; i < process.length(); i++) {
            char c = process.charAt(i);

            if (c < 'A' || c > 'Z')
                clean.append(NON_ALPHABET_CHARACTER);
            else
                clean.append(c);
        }

        return clean.toString();
    }

    /**
     * Substitutes a null variable with an empty String.
     */
    public static String noNull(final Object string) {
        if (string == null)
            return EMPTY_STRING;

        // Don't call toString twice.
        String ser = string.toString();

        return ser == null ? EMPTY_STRING : ser;
    }



    
}

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