/*
* Copyright 2010, 2011, 2012 mapsforge.org
*
* This file is part of the OpenScienceMap project (http://www.opensciencemap.org).
*
* This program is free software: you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
* PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.oscim.tiling.source.mapfile.header;
import org.oscim.core.GeoPoint;
import org.oscim.tiling.TileSource.OpenResult;
import org.oscim.tiling.source.mapfile.ReadBuffer;
final class OptionalFields {
/**
* Bitmask for the comment field in the file header.
*/
private static final int HEADER_BITMASK_COMMENT = 0x08;
/**
* Bitmask for the created by field in the file header.
*/
private static final int HEADER_BITMASK_CREATED_BY = 0x04;
/**
* Bitmask for the debug flag in the file header.
*/
private static final int HEADER_BITMASK_DEBUG = 0x80;
/**
* Bitmask for the language preference field in the file header.
*/
private static final int HEADER_BITMASK_LANGUAGE_PREFERENCE = 0x10;
/**
* Bitmask for the start position field in the file header.
*/
private static final int HEADER_BITMASK_START_POSITION = 0x40;
/**
* Bitmask for the start zoom level field in the file header.
*/
private static final int HEADER_BITMASK_START_ZOOM_LEVEL = 0x20;
/**
* The length of the language preference string.
*/
private static final int LANGUAGE_PREFERENCE_LENGTH = 2;
/**
* Maximum valid start zoom level.
*/
private static final int START_ZOOM_LEVEL_MAX = 22;
static OpenResult readOptionalFields(ReadBuffer readBuffer,
MapFileInfoBuilder mapFileInfoBuilder) {
OptionalFields optionalFields = new OptionalFields(readBuffer.readByte());
mapFileInfoBuilder.optionalFields = optionalFields;
OpenResult openResult = optionalFields.readOptionalFields(readBuffer);
if (!openResult.isSuccess()) {
return openResult;
}
return OpenResult.SUCCESS;
}
String comment;
String createdBy;
final boolean hasComment;
final boolean hasCreatedBy;
final boolean hasLanguagePreference;
final boolean hasStartPosition;
final boolean hasStartZoomLevel;
final boolean isDebugFile;
String languagePreference;
GeoPoint startPosition;
Byte startZoomLevel;
private OptionalFields(byte flags) {
this.isDebugFile = (flags & HEADER_BITMASK_DEBUG) != 0;
this.hasStartPosition = (flags & HEADER_BITMASK_START_POSITION) != 0;
this.hasStartZoomLevel = (flags & HEADER_BITMASK_START_ZOOM_LEVEL) != 0;
this.hasLanguagePreference = (flags & HEADER_BITMASK_LANGUAGE_PREFERENCE) != 0;
this.hasComment = (flags & HEADER_BITMASK_COMMENT) != 0;
this.hasCreatedBy = (flags & HEADER_BITMASK_CREATED_BY) != 0;
}
private OpenResult readLanguagePreference(ReadBuffer readBuffer) {
if (this.hasLanguagePreference) {
String countryCode = readBuffer.readUTF8EncodedString();
if (countryCode.length() != LANGUAGE_PREFERENCE_LENGTH) {
return new OpenResult("invalid language preference: " + countryCode);
}
this.languagePreference = countryCode;
}
return OpenResult.SUCCESS;
}
private OpenResult readMapStartPosition(ReadBuffer readBuffer) {
if (this.hasStartPosition) {
// get and check the start position latitude (4 byte)
int mapStartLatitude = readBuffer.readInt();
if (mapStartLatitude < RequiredFields.LATITUDE_MIN
|| mapStartLatitude > RequiredFields.LATITUDE_MAX) {
return new OpenResult("invalid map start latitude: " + mapStartLatitude);
}
// get and check the start position longitude (4 byte)
int mapStartLongitude = readBuffer.readInt();
if (mapStartLongitude < RequiredFields.LONGITUDE_MIN
|| mapStartLongitude > RequiredFields.LONGITUDE_MAX) {
return new OpenResult("invalid map start longitude: " + mapStartLongitude);
}
this.startPosition = new GeoPoint(mapStartLatitude, mapStartLongitude);
}
return OpenResult.SUCCESS;
}
private OpenResult readMapStartZoomLevel(ReadBuffer readBuffer) {
if (this.hasStartZoomLevel) {
// get and check the start zoom level (1 byte)
byte mapStartZoomLevel = readBuffer.readByte();
if (mapStartZoomLevel < 0 || mapStartZoomLevel > START_ZOOM_LEVEL_MAX) {
return new OpenResult("invalid map start zoom level: " + mapStartZoomLevel);
}
this.startZoomLevel = Byte.valueOf(mapStartZoomLevel);
}
return OpenResult.SUCCESS;
}
private OpenResult readOptionalFields(ReadBuffer readBuffer) {
OpenResult openResult = readMapStartPosition(readBuffer);
if (!openResult.isSuccess()) {
return openResult;
}
openResult = readMapStartZoomLevel(readBuffer);
if (!openResult.isSuccess()) {
return openResult;
}
openResult = readLanguagePreference(readBuffer);
if (!openResult.isSuccess()) {
return openResult;
}
if (this.hasComment) {
this.comment = readBuffer.readUTF8EncodedString();
}
if (this.hasCreatedBy) {
this.createdBy = readBuffer.readUTF8EncodedString();
}
return OpenResult.SUCCESS;
}
}