internal.analyzers.filters.AlphaNumericFilter.java Source code

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Here is the source code for internal.analyzers.filters.AlphaNumericFilter.java

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/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2015 Chris Bellis, Chris Perry
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

package internal.analyzers.filters;

import org.apache.commons.lang.StringUtils;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
import org.apache.lucene.analysis.util.FilteringTokenFilter;

import java.io.IOException;

/**
 * Ensures that a token is alpha numeric, filters tokens that are not alphanumeric
 * Created by chris on 8/26/15.
 */
public class AlphaNumericFilter extends FilteringTokenFilter {
    public AlphaNumericFilter(TokenStream in) {
        super(in);
    }

    @Override
    protected boolean accept() throws IOException {
        String token = this.input.getAttribute(CharTermAttribute.class).toString().trim();

        return StringUtils.isAlphanumeric(token);
    }
}