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/*
* Copyright 2017 Huawei Technologies Co., Ltd.
*
* 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 org.onap.cli.main.interactive;
import jline.console.completer.Completer;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import java.util.SortedSet;
import java.util.TreeSet;
/**
* String completer for autocomplete commands.
*
*/
public class StringCompleter implements Completer {
private final SortedSet<String> strings = new TreeSet<>();
/**
* Public Constructor takes collection of strings.
*
* @param strings collection
*/
public StringCompleter(Collection<String> strings) {
this.strings.addAll(strings);
}
/**
* Public Constructor takes array of strings.
*
* @param strings array of strings
*/
public void add(String... strings) {
this.strings.addAll(Arrays.asList(strings));
}
/**
* String completion.
*
* @param buffer
* string
* @param cursor
* int
* @param candidates
* list
* @return int
*/
public int complete(String buffer, int cursor, List<CharSequence> candidates) {
if (buffer == null) {
candidates.addAll(strings);
} else {
for (String match : strings.tailSet(buffer)) {
if (!match.startsWith(buffer)) {
break;
}
candidates.add(match);
}
}
if (candidates.size() == 1) {
candidates.set(0, candidates.get(0) + " ");
}
return candidates.isEmpty() ? -1 : 0;
}
}
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