DMDirc-Client/src/main/java/com/dmdirc/commandparser/commands/Command.java

/*
 * Copyright (c) 2006-2015 DMDirc Developers
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package com.dmdirc.commandparser.commands;

import com.dmdirc.commandparser.CommandArguments;
import com.dmdirc.commandparser.commands.context.CommandContext;
import com.dmdirc.events.CommandErrorEvent;
import com.dmdirc.events.CommandOutputEvent;
import com.dmdirc.interfaces.CommandController;
import com.dmdirc.interfaces.WindowModel;
import com.dmdirc.ui.messages.IRCControlCodes;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;

/**
 * Represents a generic command.
 */
public abstract class Command {

    /** The controller this command is associated with. */
    private final CommandController controller;

    public Command(final CommandController controller) {
        this.controller = controller;
    }

    protected CommandController getController() {
        return controller;
    }

    /**
     * Sends an output line, if appropriate, to the specified target.
     *
     * @param target   The command window to send the line to
     * @param isSilent Whether this command is being silenced or not
     * @param message  The output to send
     */
    protected final void showOutput(@Nullable final WindowModel target,
            final boolean isSilent, final String message) {
        if (!isSilent && target != null) {
            target.getEventBus().publishAsync(new CommandOutputEvent(target, message));
        }
    }

    /**
     * Sends an error line, if appropriate, to the specified target.
     *
     * @param target   The command window to send the line to
     * @param isSilent Whether this command is being silenced or not
     * @param message  The error message to send
     */
    protected final void showError(@Nullable final WindowModel target,
            final boolean isSilent, final String message) {
        if (!isSilent && target != null) {
            target.getEventBus().publishAsync(new CommandErrorEvent(target, message));
        }
    }

    /**
     * Sends a usage line, if appropriate, to the specified target.
     *
     * @param target   The command window to send the line to
     * @param isSilent Whether this command is being silenced or not
     * @param name     The name of the command that's raising the error
     * @param args     The arguments that the command accepts or expects
     */
    protected final void showUsage(@Nullable final WindowModel target,
            final boolean isSilent, final String name, final String args) {
        if (!isSilent && target != null) {
            target.getEventBus().publishAsync(new CommandErrorEvent(target,
                    "Usage: " + controller.getCommandChar() + name + ' ' + args));
        }
    }

    /**
     * Formats the specified data into a table suitable for output in the textpane. It is expected
     * that each String[] in data has the same number of elements as the headers array.
     *
     * @param headers The headers of the table.
     * @param data    The contents of the table.
     *
     * @return A string containing an ASCII table
     */
    protected static String doTable(final String[] headers, final String[][] data) {
        final StringBuilder res = new StringBuilder();
        res.append(IRCControlCodes.FIXED);
        res.append(IRCControlCodes.BOLD);

        final int[] maxsizes = new int[headers.length];

        for (int i = 0; i < headers.length; i++) {
            maxsizes[i] = headers[i].length() + 3;

            for (String[] row : data) {
                maxsizes[i] = Math.max(maxsizes[i], row[i].length() + 3);
            }

            doPadding(res, headers[i], maxsizes[i]);
        }

        for (String[] source : data) {
            res.append('\n');
            res.append(IRCControlCodes.FIXED);

            for (int i = 0; i < source.length; i++) {
                doPadding(res, source[i], maxsizes[i]);
            }
        }

        return res.toString();
    }

    /**
     * Adds the specified data to the stringbuilder, padding with spaces to the specified size.
     *
     * @param builder The stringbuilder to append data to
     * @param data    The data to be added
     * @param size    The minimum size that should be used
     */
    private static void doPadding(final StringBuilder builder, final String data,
            final int size) {
        builder.append(data);

        for (int i = 0; i < size - data.length(); i++) {
            builder.append(' ');
        }
    }

    /**
     * Executes this command.
     *
     * @param origin  The container which received the command
     * @param args    Arguments passed to this command
     * @param context The context the command was executed in
     *
     * @since 0.6.4
     */
    public abstract void execute(@Nonnull WindowModel origin, CommandArguments args,
            CommandContext context);

}