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Autocomplete.java
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/
Autocomplete.java
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/*
* Copyright 2020 Emory University
*
* Licensed 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 edu.emory.cs.trie.autocomplete;
import edu.emory.cs.trie.Trie;
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.List;
/**
* @author Jinho D. Choi ({@code jinho.choi@emory.edu})
*/
public abstract class Autocomplete<T> extends Trie<T> {
private final int max;
/**
* @param dict_path the path to the dictionary file (e.g., "src/main/resources/dict.txt").
* @param max the maximum number of candidates to be retrieved.
*/
public Autocomplete(String dict_path, int max) {
this.max = max;
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(dict_path)));
int count = 0;
String line;
while ((line = reader.readLine()) != null) {
put(line.trim(), null);
count++;
}
System.out.printf("# of words added: %d\n", count);
} catch (IOException ignored) {}
}
public int getMax() {
return max;
}
/**
* @param prefix the prefix of candidate words to return.
* @return the list of candidate words for the specific prefix.
*/
public abstract List<String> getCandidates(String prefix);
/**
* Memorize the specific candidate word for the specific prefix.
* @param prefix the prefix.
* @param candidate the selected candidate for the prefix.
*/
public abstract void pickCandidate(String prefix, String candidate);
}