/*
* This file is part of the DiffX library.
*
* For licensing information please see the file license.txt included in the release.
* A copy of this licence can also be found at
* http://www.opensource.org/licenses/artistic-license-2.0.php
*/
package com.topologi.diffx.load.text;
import com.topologi.diffx.config.DiffXConfig;
import com.topologi.diffx.config.TextGranularity;
/**
* Factory for tokenizers.
*
* <p>This class is designed to returned tokenizers that corresponds to the given configuration.
*
* @author Christophe Lauret
* @version 10 May 2010
*/
public final class TokenizerFactory {
/**
* Creates a factory for tokenizers.
*
* @throws NullPointerException If the configuration is <code>null</code>.
*/
private TokenizerFactory() {
}
/**
* Returns the text tokenizer.
*
* @param config The configuration to use.
*
* @return the corresponding tokenizer.
*
* @throws NullPointerException If the configuration is <code>null</code>.
*/
public static TextTokenizer get(DiffXConfig config) {
if (config == null) throw new NullPointerException("The config should be specified");
TextGranularity granularity = config.getGranularity();
switch (granularity) {
case CHARACTER: return new TokenizerByChar();
case WORD: return new TokenizerByWord(config.getWhiteSpaceProcessing());
case TEXT: return new TokenizerByText(config.getWhiteSpaceProcessing());
default:
throw new IllegalArgumentException("Unsupported text granularity "+granularity);
}
}
}