Tuesday, 17 July 2018

Java: Get alphabets of all the supported languages

In this post, I am going to explain, how to get the alphabets in all the java supported languages.

Java do not provide any APIs, to get the alphabets in all the supported locales. I am going to use icu4j API to get the alphabets information.

                  <!-- https://mvnrepository.com/artifact/com.ibm.icu/icu4j -->
                  <dependency>
                           <groupId>com.ibm.icu</groupId>
                           <artifactId>icu4j</artifactId>
                           <version>62.1</version>
                  </dependency>

Below method prints all the lower case alphabets in given language.
	public static String getLowerAlphabets(Locale locale) {
		if (locale == null) {
			throw new IllegalArgumentException("locale coudn't be null");
		}

		ULocale ulocale = ULocale.forLocale(locale);
		UnicodeSet set = LocaleData.getExemplarSet(ulocale, LocaleData.ES_STANDARD);

		Iterator<String> iterator = set.iterator();
		StringBuilder builder = new StringBuilder();
		while (iterator.hasNext()) {
			builder.append(iterator.next());

		}

		return builder.toString();
	}

Find the below working example.

AlphabetUtil.java
package com.smaple.app.util;

import java.util.Iterator;
import java.util.Locale;

import com.ibm.icu.text.UnicodeSet;
import com.ibm.icu.util.LocaleData;
import com.ibm.icu.util.ULocale;

public class AlphabetUtil {

	/**
	 * Return lower case alphabets of given locale
	 * 
	 * @param locale
	 * @return
	 */
	public static String getLowerAlphabets(Locale locale) {
		if (locale == null) {
			throw new IllegalArgumentException("locale coudn't be null");
		}

		ULocale ulocale = ULocale.forLocale(locale);
		UnicodeSet set = LocaleData.getExemplarSet(ulocale, LocaleData.ES_STANDARD);

		Iterator<String> iterator = set.iterator();
		StringBuilder builder = new StringBuilder();
		while (iterator.hasNext()) {
			builder.append(iterator.next());

		}

		return builder.toString();
	}

	/**
	 * Return upper case alphabets of given locale.
	 * 
	 * @param locale
	 * @return
	 */
	public static String getUpperAlphabets(Locale locale) {
		return getLowerAlphabets(locale).toUpperCase(locale);
	}

}


Test.java
package com.sample.app;

import java.util.Locale;

import com.smaple.app.util.AlphabetUtil;

public class Test {

	public static void main(String args[]) {
		System.out.println(AlphabetUtil.getLowerAlphabets(Locale.ENGLISH));
		System.out.println(AlphabetUtil.getUpperAlphabets(Locale.ENGLISH));
	}
}

Output
abcdefghijklmnopqrstuvwxyz
ABCDEFGHIJKLMNOPQRSTUVWXYZ


Print all the language alphabets to a html file
Below function writes all the alphabets of java supported locales to a file in html table format.
	public static void printToFile(String htmlFilePath) {
		if (htmlFilePath == null || htmlFilePath.isEmpty()) {
			htmlFilePath = "out.html";
		}

		StringBuilder builder = new StringBuilder();

		builder.append("<html>");
		builder.append("<head>\r\n" + "<style>\r\n" + "table, th, td {\r\n" + "    border: 1px solid black;\r\n"
				+ "}\r\n" + "</style>\r\n" + "</head>");
		builder.append("<body><table style=\"width:100%;text-align:left;background-color:gold;\"");

		builder.append("<tr><td>Locale</td>");
		builder.append("<td>Lower Case Alphabets</td>");
		builder.append("<td>Upper Case Alphabets</td></tr>");

		Locale[] locales = Locale.getAvailableLocales();

		for (Locale locale : locales) {
			builder.append("<tr><td>" + locale.toString() + "</td>");
			builder.append("<td>" + getLowerAlphabets(locale) + "</td>");
			builder.append("<td>" + getUpperAlphabets(locale) + "</td></tr>");
		}

		writeDataToFile(htmlFilePath, builder.toString());
	}


Find the below working application.

AlphabetUtil.java
package com.smaple.app.util;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.util.Iterator;
import java.util.Locale;

import com.ibm.icu.text.UnicodeSet;
import com.ibm.icu.util.LocaleData;
import com.ibm.icu.util.ULocale;

public class AlphabetUtil {

	/**
	 * Return lower case alphabets of given locale
	 * 
	 * @param locale
	 * @return
	 */
	public static String getLowerAlphabets(Locale locale) {
		if (locale == null) {
			throw new IllegalArgumentException("locale coudn't be null");
		}

		ULocale ulocale = ULocale.forLocale(locale);
		UnicodeSet set = LocaleData.getExemplarSet(ulocale, LocaleData.ES_STANDARD);

		Iterator<String> iterator = set.iterator();
		StringBuilder builder = new StringBuilder();
		while (iterator.hasNext()) {
			builder.append(iterator.next());

		}

		return builder.toString();
	}

	/**
	 * Return upper case alphabets of given locale.
	 * 
	 * @param locale
	 * @return
	 */
	public static String getUpperAlphabets(Locale locale) {
		return getLowerAlphabets(locale).toUpperCase(locale);
	}

	/**
	 * Write all alphabets of java supported locales to a file in html format.
	 * 
	 * @param htmlFilePath
	 */
	public static void printToFile(String htmlFilePath) {
		if (htmlFilePath == null || htmlFilePath.isEmpty()) {
			htmlFilePath = "out.html";
		}

		StringBuilder builder = new StringBuilder();

		builder.append("<html>");
		builder.append("<head>\r\n" + "<style>\r\n" + "table, th, td {\r\n" + "    border: 1px solid black;\r\n"
				+ "}\r\n" + "</style>\r\n" + "</head>");
		builder.append("<body><table style=\"width:100%;text-align:left;background-color:gold;\"");

		builder.append("<tr><td>Locale</td>");
		builder.append("<td>Lower Case Alphabets</td>");
		builder.append("<td>Upper Case Alphabets</td></tr>");

		Locale[] locales = Locale.getAvailableLocales();

		for (Locale locale : locales) {
			builder.append("<tr><td>" + locale.toString() + "</td>");
			builder.append("<td>" + getLowerAlphabets(locale) + "</td>");
			builder.append("<td>" + getUpperAlphabets(locale) + "</td></tr>");
		}

		writeDataToFile(htmlFilePath, builder.toString());
	}

	private static void writeDataToFile(String htmlFilePath, String data) {

		File file = new File(htmlFilePath);
		String encoding = "UTF8";

		try (OutputStreamWriter writer = new OutputStreamWriter(new FileOutputStream(file), encoding)) {
			writer.write(data);
		} catch (UnsupportedEncodingException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

	}

}

Test.java

package com.sample.app;

import com.smaple.app.util.AlphabetUtil;

public class Test {

	public static void main(String args[]) {
		AlphabetUtil.printToFile("localeAlphabets.html");
	}
}

Run Test.java, it copies all the alphabets of java supported locales to ‘localeAlphabtes.html’ file.

Open ‘localeAlphabtes.html’ file, you can able to see below kind of output.

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