co.cask.common.cli.completers.StringsCompleter.java Source code

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Here is the source code for co.cask.common.cli.completers.StringsCompleter.java

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/*
 * 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.common.cli.completers;

import com.google.common.base.Supplier;
import com.google.common.collect.Lists;
import com.google.common.collect.Ordering;
import java.util.Collection;
import java.util.Collections;
import java.util.List;

/**
 * Completer for a set of strings.
 */
public abstract class StringsCompleter extends AbstractCompleter {

    protected abstract Supplier<Collection<String>> getStringsSupplier();

    @Override
    protected Collection<String> getAllCandidates() {
        return getStrings();
    }

    @Override
    protected Collection<String> getCandidates(String buffer) {
        List<String> mutableCandidates = Lists.newArrayList();
        for (String candidate : getStrings()) {
            if (candidate.startsWith(buffer)) {
                mutableCandidates.add(candidate);
            }
        }
        Collections.sort(mutableCandidates, Ordering.usingToString());
        return Collections.unmodifiableList(mutableCandidates);
    }

    public Collection<String> getStrings() {
        return getStringsSupplier().get();
    }
}