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/*
* Copyright 2020 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.function.Function;
import java.util.stream.Collectors;
/** Applies remove or replace of certain characters based on condition. */
public class TextCleaner implements TextProcessor {
private Function condition;
private char replace;
/**
* Remove a character if it meets the condition supplied.
*
* @param condition lambda function that defines whether a character meets condition
*/
public TextCleaner(Function condition) {
this.condition = condition;
}
/**
* Replace a character if it meets the condition supplied.
*
* @param condition lambda function that defines whether a character meets condition
* @param replace the character to replace
*/
public TextCleaner(Function condition, char replace) {
this.condition = condition;
this.replace = replace;
}
private String cleanText(String text) {
StringBuilder sb = new StringBuilder();
for (char c : text.toCharArray()) {
if (condition.apply(c)) {
if (replace == '\u0000') {
continue;
} else {
sb.append(replace);
}
} else {
sb.append(c);
}
}
return sb.toString();
}
/** {@inheritDoc} */
@Override
public List preprocess(List tokens) {
return tokens.stream().map(this::cleanText).collect(Collectors.toList());
}
}