org.apache.accumulo.shell.commands.NamespacesCommand.java Source code

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Here is the source code for org.apache.accumulo.shell.commands.NamespacesCommand.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF 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 org.apache.accumulo.shell.commands;

import java.io.IOException;
import java.util.Iterator;
import java.util.Map;
import java.util.TreeMap;

import org.apache.accumulo.core.client.AccumuloException;
import org.apache.accumulo.core.client.AccumuloSecurityException;
import org.apache.accumulo.core.client.impl.Namespaces;
import org.apache.accumulo.shell.Shell;
import org.apache.accumulo.shell.Shell.Command;
import org.apache.commons.cli.CommandLine;
import org.apache.commons.cli.Option;
import org.apache.commons.cli.Options;

import com.google.common.collect.Iterators;

public class NamespacesCommand extends Command {
    private Option disablePaginationOpt, namespaceIdOption;

    private static final String DEFAULT_NAMESPACE_DISPLAY_NAME = "\"\"";

    @Override
    public int execute(final String fullCommand, final CommandLine cl, final Shell shellState)
            throws AccumuloException, AccumuloSecurityException, IOException {
        Map<String, String> namespaces = new TreeMap<String, String>(
                shellState.getConnector().namespaceOperations().namespaceIdMap());

        Iterator<String> it = Iterators.transform(namespaces.entrySet().iterator(), entry -> {
            String name = entry.getKey();
            if (Namespaces.DEFAULT_NAMESPACE.equals(name))
                name = DEFAULT_NAMESPACE_DISPLAY_NAME;
            String id = entry.getValue();
            if (cl.hasOption(namespaceIdOption.getOpt()))
                return String.format(TablesCommand.NAME_AND_ID_FORMAT, name, id);
            else
                return name;
        });

        shellState.printLines(it, !cl.hasOption(disablePaginationOpt.getOpt()));
        return 0;
    }

    @Override
    public String description() {
        return "displays a list of all existing namespaces";
    }

    @Override
    public Options getOptions() {
        final Options o = new Options();
        namespaceIdOption = new Option("l", "list-ids", false,
                "display internal namespace ids along with the name");
        o.addOption(namespaceIdOption);
        disablePaginationOpt = new Option("np", "no-pagination", false, "disable pagination of output");
        o.addOption(disablePaginationOpt);
        return o;
    }

    @Override
    public int numArgs() {
        return 0;
    }
}