io.fabric8.process.manager.commands.support.KindCompleter.java Source code

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Here is the source code for io.fabric8.process.manager.commands.support.KindCompleter.java

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/**
 *  Copyright 2005-2014 Red Hat, Inc.
 *
 *  Red Hat licenses this file to you 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 io.fabric8.process.manager.commands.support;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.List;

import com.google.common.base.Charsets;
import com.google.common.collect.Lists;
import com.google.common.io.Closeables;
import io.fabric8.api.scr.AbstractComponent;
import io.fabric8.process.manager.ProcessManager;
import org.apache.felix.scr.annotations.Activate;
import org.apache.felix.scr.annotations.Component;
import org.apache.felix.scr.annotations.Deactivate;
import org.apache.felix.scr.annotations.Service;
import org.apache.karaf.shell.console.Completer;
import org.apache.karaf.shell.console.completer.StringsCompleter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Loads the controllerKinds on the classpath and uses is to complete on the kinds of controller available
 */
@Component(immediate = true)
@Service({ KindCompleter.class, Completer.class })
public class KindCompleter extends AbstractComponent implements Completer {
    private static final transient Logger LOG = LoggerFactory.getLogger(KindCompleter.class);

    private List<String> kinds = Lists.newArrayList();

    @Activate
    void activate() {
        init();
        activateComponent();
    }

    @Deactivate
    void deactivate() {
        deactivateComponent();
    }

    public void init() {
        // lets load the kinds from the classpath
        InputStream in = ProcessManager.class.getResourceAsStream("controllerKinds");
        if (in == null) {
            LOG.warn("Cannot find controllerKinds on the classpath!");
        } else {
            try {
                BufferedReader reader = new BufferedReader(new InputStreamReader(in, Charsets.UTF_8));
                while (true) {
                    String line = reader.readLine();
                    if (line == null)
                        break;
                    line = line.trim();
                    if (!line.isEmpty()) {
                        kinds.add(line);
                    }
                }
            } catch (IOException e) {
                Closeables.closeQuietly(in);
            }
        }
    }

    @Override
    public int complete(final String buffer, final int cursor, final List candidates) {
        StringsCompleter delegate = new StringsCompleter(kinds);
        return delegate.complete(buffer, cursor, candidates);
    }
}