Groups the word into alternating vowel and consonant clusters. - Java java.lang

Java examples for java.lang:char

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Description

Groups the word into alternating vowel and consonant clusters.

Demo Code


//package com.java2s;
import java.util.ArrayList;
import java.util.List;

public class Main {
    public static void main(String[] argv) throws Exception {
        String word = "java2s.com";
        System.out.println(getClustersFromWord(word));
    }//from   ww  w  .j  a  v  a 2 s.  co m

    /**
     * Groups the word into alternating vowel and consonant clusters.
     *
     * Note that the even-indexed clusters are always consonants, and the odd-indexed clusters
     * are always vowels. This means that if the word starts with a vowel, the first cluster is
     * null
     *
     * @param word
     *            In practice this is often a fragment of a word, not the complete word
     * @return
     */
    static List<String> getClustersFromWord(String word) {
        List<String> clusters = new ArrayList<String>();
        StringBuffer currentCluster = new StringBuffer();
        boolean buildingConsonantCluster = true;
        for (int i = 0; i < word.length(); i++) {
            char c = word.charAt(i);
            if (i == 0 && isVowel(c)) {
                // corner case: we start with a vowel
                clusters.add(null); // the first cluster is null if we start with a vowel
                currentCluster.append(c);

            } else if (buildingConsonantCluster && isVowel(c)) {
                // we just finished a consonant cluster
                clusters.add(currentCluster.toString());
                currentCluster.delete(0, currentCluster.length());
                currentCluster.append(c);
                buildingConsonantCluster = false;

            } else if (!buildingConsonantCluster && isConsonant(c)) {
                // we just finished a vowel cluster
                clusters.add(currentCluster.toString());
                currentCluster.delete(0, currentCluster.length());
                currentCluster.append(c);
                buildingConsonantCluster = true;

            } else if (buildingConsonantCluster && isConsonant(c)) {
                // still building a consonant cluster
                currentCluster.append(c);

            } else if (!buildingConsonantCluster && isVowel(c)) {
                // still building vowel cluster
                currentCluster.append(c);

            } else {
                throw new RuntimeException(
                        "I missed a case in the clustering code");
            }

        }
        clusters.add(currentCluster.toString());
        return clusters;
    }

    static boolean isVowel(char c) {
        return c == 'a' || c == 'e' || c == 'i' || c == 'o' || c == 'u'
                || c == 'y' || c == 'A' || c == 'E' || c == 'I' || c == 'O'
                || c == 'U' || c == 'Y';
    }

    static boolean isConsonant(char c) {
        return !isVowel(c);
    }
}

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