org.sventon.model.DirEntryNameSplitter.java Source code

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Here is the source code for org.sventon.model.DirEntryNameSplitter.java

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/*
 * ====================================================================
 * Copyright (c) 2005-2012 sventon project. All rights reserved.
 *
 * This software is licensed as described in the file LICENSE, which
 * you should have received as part of this distribution. The terms
 * are also available at http://www.sventon.org.
 * If newer versions of this license are posted there, you may use a
 * newer version instead, at your option.
 * ====================================================================
 */
package org.sventon.model;

import org.apache.commons.lang.StringUtils;

import java.util.ArrayList;
import java.util.List;
import java.util.regex.Pattern;

/**
 * Splits up a directory entry name into fragments suited for indexation.
 */
public class DirEntryNameSplitter {

    private String entryName;

    private static final Pattern PUNCTUATION_PATTERN = Pattern.compile("\\p{Punct}+");

    /**
     * Constructor.
     *
     * @param entryName Entry name to split
     */
    public DirEntryNameSplitter(final String entryName) {

        this.entryName = entryName;
    }

    /**
     * @return Space delimited fragments without punctuation.
     */
    public List<String> split() {
        final String strippedName = removePunctuationCharacters();
        final List<String> fragments = new ArrayList<String>();
        final StringBuilder tempBuf = new StringBuilder();
        boolean start = false;

        for (int i = 0; i < strippedName.length(); i++) {
            final Character c = strippedName.charAt(i);
            if (Character.isWhitespace(c)) {
                start = addFragment(fragments, tempBuf);
            } else if (Character.isUpperCase(c) || !Character.isLetter(c)) {
                if (!start) {
                    start = addFragment(fragments, tempBuf);
                }
                tempBuf.append(c);
            } else {
                if (start)
                    start = false;
                tempBuf.append(c);
            }
        }
        addFragment(fragments, tempBuf);
        return fragments;
    }

    private String removePunctuationCharacters() {
        return PUNCTUATION_PATTERN.matcher(entryName).replaceAll(" ");
    }

    private boolean addFragment(final List<String> fragments, final StringBuilder buf) {
        final String trimmedString = StringUtils.trimToNull(buf.toString());
        if (trimmedString != null)
            fragments.add(trimmedString);
        buf.setLength(0);
        return true;
    }

}