com.planet57.gshell.commands.pref.ExportPreferencesAction.java Source code

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Here is the source code for com.planet57.gshell.commands.pref.ExportPreferencesAction.java

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/*
 * Copyright (c) 2009-present the original author or authors.
 *
 * 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.planet57.gshell.commands.pref;

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;

import com.google.common.io.Flushables;
import com.planet57.gshell.command.Command;
import com.planet57.gshell.command.CommandContext;
import com.planet57.gshell.util.io.IO;
import com.planet57.gshell.util.cli2.Argument;
import com.planet57.gshell.util.cli2.Option;
import com.planet57.gshell.util.i18n.I18N;
import com.planet57.gshell.util.i18n.MessageBundle;
import com.planet57.gshell.util.pref.Preference;
import com.planet57.gshell.util.pref.Preferences;

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

/**
 * Export preference nodes to a file.
 *
 * @since 2.0
 */
@Command(name = "pref/export", description = "Export preferences")
@Preferences(path = "commands/pref/export")
public class ExportPreferencesAction extends PreferenceNodeActionSupport {
    private interface Messages extends MessageBundle {
        @DefaultMessage("Exporting preferences to: %s")
        String exportingTo(File file);
    }

    private static final Messages messages = I18N.create(Messages.class);

    @Preference
    @Option(name = "t", longName = "subtree", description = "Include sub-tree preferences")
    private boolean subTree;

    @Nullable
    @Argument(index = 1, description = "Preferences export file", token = "FILE")
    private File file;

    @Override
    public Object execute(@Nonnull final CommandContext context) throws Exception {
        IO io = context.getIo();
        java.util.prefs.Preferences prefs = node();

        try (OutputStream out = openStream(io)) {
            if (subTree) {
                prefs.exportSubtree(out);
            } else {
                prefs.exportNode(out);
            }

            Flushables.flushQuietly(out);
        }

        prefs.sync();

        return null;
    }

    private OutputStream openStream(final IO io) throws IOException {
        if (file == null) {
            return io.streams.out;
        } else {
            io.println(messages.exportingTo(file));
            return new BufferedOutputStream(new FileOutputStream(file));
        }
    }
}