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Stanford CoreNLP provides a set of natural language analysis tools which can take raw English language text input and give the base forms of words, their parts of speech, whether they are names of companies, people, etc., normalize dates, times, and numeric quantities, mark up the structure of sentences in terms of phrases and word dependencies, and indicate which noun phrases refer to the same entities. It provides the foundational building blocks for higher level text understanding applications.

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package edu.stanford.nlp.pipeline;

import java.lang.reflect.Field;
import java.util.*;

/**
 * This contains mappings from strings to language properties files
 */

public class LanguageInfo {

    /** languages supported **/
    public enum HumanLanguage {ARABIC, CHINESE, ENGLISH, FRENCH, GERMAN, SPANISH}

    /** list of properties files for each language **/
    public static final String ARABIC_PROPERTIES = "StanfordCoreNLP-arabic.properties";
    public static final String CHINESE_PROPERTIES = "StanfordCoreNLP-chinese.properties";
    public static final String ENGLISH_PROPERTIES = "StanfordCoreNLP.properties";
    public static final String FRENCH_PROPERTIES = "StanfordCoreNLP-french.properties";
    public static final String GERMAN_PROPERTIES = "StanfordCoreNLP-german.properties";
    public static final String SPANISH_PROPERTIES = "StanfordCoreNLP-spanish.properties";

    /** map enum to properties file **/
    public static final HashMap languageToPropertiesFile;
    static {
        languageToPropertiesFile = new HashMap();
        languageToPropertiesFile.put(HumanLanguage.ARABIC, ARABIC_PROPERTIES);
        languageToPropertiesFile.put(HumanLanguage.CHINESE, CHINESE_PROPERTIES);
        languageToPropertiesFile.put(HumanLanguage.ENGLISH, ENGLISH_PROPERTIES);
        languageToPropertiesFile.put(HumanLanguage.FRENCH, FRENCH_PROPERTIES);
        languageToPropertiesFile.put(HumanLanguage.GERMAN, GERMAN_PROPERTIES);
        languageToPropertiesFile.put(HumanLanguage.SPANISH, SPANISH_PROPERTIES);
    }

    private LanguageInfo() {
    }

    /**
     * Go through all of the paths via reflection, and print them out in a TSV format.
     * This is useful for command line scripts.
     *
     * @param args Ignored.
     */
    public static void main(String[] args) throws IllegalAccessException {
        for (Field field : LanguageInfo.class.getFields()) {
            System.out.println(field.getName() + "\t" + field.get(null));
        }
    }

    /** return the properties file name for a specific language **/
    public static String getLanguagePropertiesFile(String inputString) {
        return languageToPropertiesFile.get(getLanguageFromString(inputString));
    }

    /** convert various input strings to language enum **/
    public static HumanLanguage getLanguageFromString(String inputString) {
        if (inputString.toLowerCase().equals("arabic") || inputString.toLowerCase().equals("ar"))
            return HumanLanguage.ARABIC;
        if (inputString.toLowerCase().equals("english") || inputString.toLowerCase().equals("en"))
            return HumanLanguage.ENGLISH;
        if (inputString.toLowerCase().equals("chinese") || inputString.toLowerCase().equals("zh"))
            return HumanLanguage.CHINESE;
        if (inputString.toLowerCase().equals("french") || inputString.toLowerCase().equals("fr"))
            return HumanLanguage.FRENCH;
        if (inputString.toLowerCase().equals("german") || inputString.toLowerCase().equals("de"))
            return HumanLanguage.GERMAN;
        if (inputString.toLowerCase().equals("spanish") || inputString.toLowerCase().equals("es"))
            return HumanLanguage.SPANISH;
        else
            return null;
    }

    /** check if language is a segmenter language, return enum **/
    public static boolean isSegmenterLanguage(HumanLanguage language) {
        if (language == HumanLanguage.ARABIC || language == HumanLanguage.CHINESE)
            return true;
        else
            return false;
    }

    public static boolean isSegmenterLanguage(String inputString) {
        return isSegmenterLanguage(getLanguageFromString(inputString));
    }
}