org.syphr.mythtv.protocol.impl.Command63QueryPixMapGetIfModified Maven / Gradle / Ivy

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This library provides a Java interface to the MythTV backend protocol.
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/*
 * Copyright 2011-2012 Gregory P. Moyer
 *
 * 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 org.syphr.mythtv.protocol.impl;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.concurrent.TimeUnit;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.commons.codec.binary.Base64;
import org.syphr.mythtv.data.PixMap;
import org.syphr.mythtv.data.Program;
import org.syphr.mythtv.util.exception.CommandException;
import org.syphr.mythtv.util.exception.ProtocolException;
import org.syphr.mythtv.util.exception.ProtocolException.Direction;
import org.syphr.mythtv.util.socket.SocketManager;
import org.syphr.mythtv.util.translate.Translator;

/* default */class Command63QueryPixMapGetIfModified extends AbstractProtocolCommand
{
    private static final Pattern BAD_RESPONSE_PATTERN = Pattern.compile("\\d: (.*)");

    private final Date timestamp;
    private final int maxFileSize;
    private final Program program;

    public Command63QueryPixMapGetIfModified(Translator translator,
                                             Parser parser,
                                             Date timestamp,
                                             int maxFileSize,
                                             Program program)
    {
        super(translator, parser);

        this.timestamp = timestamp;
        this.maxFileSize = maxFileSize;
        this.program = program;
    }

    @Override
    protected String getMessage() throws ProtocolException
    {
        List messageList = new ArrayList();
        messageList.add("QUERY_PIXMAP_GET_IF_MODIFIED");
        messageList.add(timestamp == null
                ? "-1"
                : String.valueOf(TimeUnit.MILLISECONDS.toSeconds(timestamp.getTime())));
        messageList.add(String.valueOf(maxFileSize));
        messageList.addAll(getParser().extractProgramInfo(program));

        return getParser().combineArguments(messageList);
    }

    @Override
    public PixMap send(SocketManager socketManager) throws IOException,
                                                   CommandException
    {
        String response = socketManager.sendAndWait(getMessage());
        List args = getParser().splitArguments(response);

        if (args.size() == 0)
        {
            throw new ProtocolException(response, Direction.RECEIVE);
        }

        if ("ERROR".equals(args.get(0)) || "WARNING".equals(args.get(0)))
        {
            if (args.size() != 2)
            {
                throw new ProtocolException(response, Direction.RECEIVE);
            }

            Matcher matcher = BAD_RESPONSE_PATTERN.matcher(args.get(1));
            if (matcher.find())
            {
                throw new CommandException(matcher.group(1));
            }

            throw new ProtocolException(response, Direction.RECEIVE);
        }

        try
        {
            switch (args.size())
            {
                case 1:
                    return new PixMap(new Date(TimeUnit.SECONDS.toMillis(Long.parseLong(args.get(0)))));

                case 4:
                    Date lastModified = new Date(TimeUnit.SECONDS.toMillis(Long.parseLong(args.get(0))));
                    int size = Integer.parseInt(args.get(1));
                    String checksum = args.get(2);
                    byte[] data = new Base64().decode(args.get(3));

                    return new PixMap(lastModified, size, checksum, data);

                default:
                    throw new ProtocolException(response, Direction.RECEIVE);
            }
        }
        catch (NumberFormatException e)
        {
            throw new ProtocolException(response, Direction.RECEIVE, e);
        }
    }
}