org.apache.accumulo.core.client.mock.MockShell.java Source code

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Here is the source code for org.apache.accumulo.core.client.mock.MockShell.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.core.client.mock;

import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.Writer;

import jline.ConsoleReader;

import org.apache.accumulo.core.util.shell.Shell;
import org.apache.commons.cli.CommandLine;

/**
 * An Accumulo Shell implementation that allows a developer to attach an InputStream and Writer to the Shell for testing purposes.
 */
public class MockShell extends Shell {
    private static final String NEWLINE = "\n";

    protected InputStream in;
    protected Writer writer;

    public MockShell(InputStream in, Writer writer) throws IOException {
        super();
        this.in = in;
        this.writer = writer;
    }

    public boolean config(String... args) {
        configError = super.config(args);

        // Update the ConsoleReader with the input and output "redirected"
        try {
            this.reader = new ConsoleReader(in, writer);
        } catch (Exception e) {
            printException(e);
            configError = true;
        }

        // Don't need this for testing purposes
        this.reader.setUseHistory(false);
        this.reader.setUsePagination(false);

        // Make the parsing from the client easier;
        this.verbose = false;
        return configError;
    }

    @Override
    protected void setInstance(CommandLine cl) {
        // We always want a MockInstance for this test
        instance = new MockInstance();
    }

    public int start() throws IOException {
        if (configError)
            return 1;

        String input;
        if (isVerbose())
            printInfo();

        if (execFile != null) {
            java.util.Scanner scanner = new java.util.Scanner(new File(execFile));
            try {
                while (scanner.hasNextLine() && !hasExited()) {
                    execCommand(scanner.nextLine(), true, isVerbose());
                }
            } finally {
                scanner.close();
            }
        } else if (execCommand != null) {
            for (String command : execCommand.split("\n")) {
                execCommand(command, true, isVerbose());
            }
            return exitCode;
        }

        while (true) {
            if (hasExited())
                return exitCode;

            reader.setDefaultPrompt(getDefaultPrompt());
            input = reader.readLine();
            if (input == null) {
                reader.printNewline();
                return exitCode;
            } // user canceled

            execCommand(input, false, false);
        }
    }

    /**
     * @param in
     *          the in to set
     */
    public void setConsoleInputStream(InputStream in) {
        this.in = in;
    }

    /**
     * @param writer
     *          the writer to set
     */
    public void setConsoleWriter(Writer writer) {
        this.writer = writer;
    }

    /**
     * Convenience method to create the byte-array to hand to the console
     * 
     * @param commands
     *          An array of commands to run
     * @return A byte[] input stream which can be handed to the console.
     */
    public static ByteArrayInputStream makeCommands(String... commands) {
        StringBuilder sb = new StringBuilder(commands.length * 8);

        for (String command : commands) {
            sb.append(command).append(NEWLINE);
        }

        return new ByteArrayInputStream(sb.toString().getBytes());
    }
}