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/*
* Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License"). You may not use this file except in compliance
* with the License. A copy of the License is located at
*
* http://aws.amazon.com/apache2.0/
*
* or in the "license" file accompanying this file. This file 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 ai.djl.modality.nlp.preprocess;
import java.util.List;
import java.util.Locale;
import java.util.stream.Collectors;
/**
* {@code LowerCaseConvertor} converts every character of the input tokens to it's respective lower
* case character.
*/
public class LowerCaseConvertor implements TextProcessor {
private static final Locale DEFAULT_LOCALE = Locale.ENGLISH;
private final Locale locale;
/**
* Creates a {@link TextProcessor} that converts input text into lower case character given the
* {@link Locale}.
*
* @param locale the expected {@link Locale} of the input text
*/
public LowerCaseConvertor(Locale locale) {
this.locale = locale;
}
/**
* Creates a {@link TextProcessor} that converts input text into lower case character with the
* default english {@link Locale}.
*/
public LowerCaseConvertor() {
this(DEFAULT_LOCALE);
}
/** {@inheritDoc} */
@Override
public List preprocess(List tokens) {
return tokens.stream().map(s -> s.toLowerCase(locale)).collect(Collectors.toList());
}
}