com.google.copybara.util.console.LogConsole.java Source code

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Here is the source code for com.google.copybara.util.console.LogConsole.java

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/*
 * Copyright (C) 2016 Google 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.google.copybara.util.console;

import com.google.common.base.Preconditions;

import java.io.IOException;
import java.io.InputStream;
import java.io.PrintStream;
import java.text.SimpleDateFormat;
import java.util.Date;

import javax.annotation.Nullable;

/**
 * A simple console logger that prefixes the output with the time
 */
public class LogConsole implements Console {

    private static final SimpleDateFormat dateFormat = new SimpleDateFormat("yyyyMMdd HH:mm:ss.SSS");
    @Nullable
    private final InputStream input;
    private final PrintStream output;

    /**
     * Creates a new instance of {@link LogConsole} with write capabilities, only.
     */
    public static LogConsole writeOnlyConsole(PrintStream output) {
        return new LogConsole(/*input*/ null, Preconditions.checkNotNull(output));
    }

    /**
     * Creates a new instance of {@link LogConsole} with read and write capabilities.
     */
    public static LogConsole readWriteConsole(InputStream input, PrintStream output) {
        return new LogConsole(Preconditions.checkNotNull(input), Preconditions.checkNotNull(output));
    }

    private LogConsole(InputStream input, PrintStream output) {
        this.input = input;
        this.output = Preconditions.checkNotNull(output);
    }

    @Override
    public void startupMessage() {
        output.println("Copybara source mover");
    }

    @Override
    public void error(String message) {
        printMessage("ERROR", message);
    }

    @Override
    public void warn(String message) {
        printMessage("WARN", message);
    }

    @Override
    public void info(String message) {
        printMessage("INFO", message);
    }

    @Override
    public void progress(final String task) {
        printMessage("TASK", task);
    }

    @Override
    public boolean promptConfirmation(String message) throws IOException {
        Preconditions.checkState(input != null,
                "LogConsole cannot read user input if system console is not present.");
        return new ConsolePrompt(input, new PromptPrinter() {
            @Override
            public void print(String message) {
                output.print(dateFormat.format(new Date()) + " WARN: " + message + " [y/n] ");
            }
        }).promptConfirmation(message);
    }

    @Override
    public String colorize(AnsiColor ansiColor, String message) {
        return message;
    }

    private void printMessage(final String messageKind, String message) {
        output.println(dateFormat.format(new Date()) + " " + messageKind + ": " + message);
    }
}