/*
* Copyright © 2012-2014 Cask Data, Inc.
*
* 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 co.cask.cdap.cli.completer;
import com.google.common.base.Supplier;
import com.google.common.base.Suppliers;
import com.google.common.collect.ImmutableList;
import jline.console.completer.Completer;
import java.util.Collection;
import java.util.List;
import java.util.TreeSet;
import java.util.concurrent.TimeUnit;
import javax.annotation.Nullable;
import static jline.internal.Preconditions.checkNotNull;
/**
* Completer for a set of strings.
*/
public class StringsCompleter implements Completer {
private final Supplier<Collection<String>> strings;
public StringsCompleter(Supplier<Collection<String>> strings) {
checkNotNull(strings);
this.strings = Suppliers.memoizeWithExpiration(strings, 5000, TimeUnit.MILLISECONDS);
}
public StringsCompleter(Collection<String> strings) {
checkNotNull(strings);
this.strings = Suppliers.ofInstance(strings);
}
public StringsCompleter(String[] strings) {
checkNotNull(strings);
this.strings = Suppliers.<Collection<String>>ofInstance(ImmutableList.copyOf(strings));
}
public TreeSet<String> getStrings() {
return new TreeSet<>(strings.get());
}
@Override
public int complete(@Nullable final String buffer, final int cursor, final List<CharSequence> candidates) {
checkNotNull(candidates);
TreeSet<String> strings = getStrings();
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;
}
}