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Optional components of Mahout which generally support interaction with third party systems, formats, APIs, etc.

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/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.mahout.utils.regex;

import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;

public final class URLDecodeTransformer implements RegexTransformer {

  private final String enc;

  public URLDecodeTransformer() {
    enc = "UTF-8";
  }

  public URLDecodeTransformer(String encoding) {
    this.enc = encoding;
  }

  @Override
  public String transformMatch(String match) {
    try {
      return URLDecoder.decode(match, enc);
    } catch (UnsupportedEncodingException e) {
      throw new IllegalStateException(e);
    }
  }
}