CmdBase.java

/**
 * Copyright 2016 Yahoo 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 com.yahoo.pulsar.admin.cli;

import com.beust.jcommander.JCommander;
import com.beust.jcommander.Parameter;
import com.beust.jcommander.ParameterException;
import com.yahoo.pulsar.client.admin.PulsarAdmin;
import com.yahoo.pulsar.client.admin.PulsarAdminException;
import com.yahoo.pulsar.client.admin.PulsarAdminException.ConnectException;

public abstract class CmdBase {
    protected final JCommander jcommander;
    protected final PulsarAdmin admin;

    @Parameter(names = { "-h", "--help" }, help = true, hidden = true)
    private boolean help;

    public CmdBase(String cmdName, PulsarAdmin admin) {
        this.admin = admin;
        jcommander = new JCommander();
        jcommander.setProgramName("pulsar-admin " + cmdName);
    }

    public boolean run(String[] args) {
        try {
            jcommander.parse(args);
        } catch (Exception e) {
            System.err.println(e.getMessage());
            System.err.println();
            jcommander.usage();
            return false;
        }

        String cmd = jcommander.getParsedCommand();
        if (cmd == null) {
            jcommander.usage();
            return false;
        } else {
            JCommander obj = jcommander.getCommands().get(cmd);
            CliCommand cmdObj = (CliCommand) obj.getObjects().get(0);

            try {
                cmdObj.run();
                return true;
            } catch (ParameterException e) {
                System.err.println(e.getMessage());
                System.err.println();
                jcommander.usage();
                return false;
            } catch (ConnectException e) {
                System.err.println(e.getMessage());
                System.err.println();
                System.err.println("Error connecting to: " + admin.getServiceUrl());
                return false;
            } catch (PulsarAdminException e) {
                System.err.println(e.getHttpError());
                System.err.println();
                System.err.println("Reason: " + e.getMessage());
                return false;
            } catch (Exception e) {
                System.err.println("Got exception: " + e.getMessage());
                e.printStackTrace();
                return false;
            }
        }
    }
}