DMDirc-Client/src/main/java/com/dmdirc/commandparser/aliases/DefaultAliasInstaller.java

/*
 * Copyright (c) 2006-2017 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.aliases;

import com.dmdirc.interfaces.Migrator;

import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.Path;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import static com.dmdirc.util.LogUtils.APP_ERROR;

/**
 * Migrator that installs the default aliases file if the user does not currently have one.
 */
public class DefaultAliasInstaller implements Migrator {

    private static final Logger LOG = LoggerFactory.getLogger(DefaultAliasInstaller.class);

    private final Path target;

    public DefaultAliasInstaller(final Path target) {
        this.target = target;
    }

    @Override
    public boolean needsMigration() {
        return !Files.exists(target);
    }

    @Override
    public void migrate() {
        try (final InputStream stream = getClass().getResourceAsStream("defaults.yml")) {
            Files.copy(stream, target);
        } catch (IOException ex) {
            LOG.error(APP_ERROR, "Unable to extract default aliases", ex);
        }
    }

}