/* * Copyright 2010, 2011, 2012 mapsforge.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.mapsforge.map.reader.header; import org.mapsforge.core.util.MercatorProjection; /** * Holds all parameters of a sub-file. */ public class SubFileParameter { /** * Number of bytes a single index entry consists of. */ public static final byte BYTES_PER_INDEX_ENTRY = 5; /** * Base zoom level of the sub-file, which equals to one block. */ public final byte baseZoomLevel; /** * Vertical amount of blocks in the grid. */ public final long blocksHeight; /** * Horizontal amount of blocks in the grid. */ public final long blocksWidth; /** * Y number of the tile at the bottom boundary in the grid. */ public final long boundaryTileBottom; /** * X number of the tile at the left boundary in the grid. */ public final long boundaryTileLeft; /** * X number of the tile at the right boundary in the grid. */ public final long boundaryTileRight; /** * Y number of the tile at the top boundary in the grid. */ public final long boundaryTileTop; /** * Absolute end address of the index in the enclosing file. */ public final long indexEndAddress; /** * Absolute start address of the index in the enclosing file. */ public final long indexStartAddress; /** * Total number of blocks in the grid. */ public final long numberOfBlocks; /** * Absolute start address of the sub-file in the enclosing file. */ public final long startAddress; /** * Size of the sub-file in bytes. */ public final long subFileSize; /** * Maximum zoom level for which the block entries tables are made. */ public final byte zoomLevelMax; /** * Minimum zoom level for which the block entries tables are made. */ public final byte zoomLevelMin; /** * Stores the hash code of this object. */ private final int hashCodeValue; SubFileParameter(SubFileParameterBuilder subFileParameterBuilder) { this.startAddress = subFileParameterBuilder.startAddress; this.indexStartAddress = subFileParameterBuilder.indexStartAddress; this.subFileSize = subFileParameterBuilder.subFileSize; this.baseZoomLevel = subFileParameterBuilder.baseZoomLevel; this.zoomLevelMin = subFileParameterBuilder.zoomLevelMin; this.zoomLevelMax = subFileParameterBuilder.zoomLevelMax; this.hashCodeValue = calculateHashCode(); // calculate the XY numbers of the boundary tiles in this sub-file this.boundaryTileBottom = MercatorProjection.latitudeToTileY(subFileParameterBuilder.boundingBox.minLatitude, this.baseZoomLevel); this.boundaryTileLeft = MercatorProjection.longitudeToTileX(subFileParameterBuilder.boundingBox.minLongitude, this.baseZoomLevel); this.boundaryTileTop = MercatorProjection.latitudeToTileY(subFileParameterBuilder.boundingBox.maxLatitude, this.baseZoomLevel); this.boundaryTileRight = MercatorProjection.longitudeToTileX(subFileParameterBuilder.boundingBox.maxLongitude, this.baseZoomLevel); // calculate the horizontal and vertical amount of blocks in this sub-file this.blocksWidth = this.boundaryTileRight - this.boundaryTileLeft + 1; this.blocksHeight = this.boundaryTileBottom - this.boundaryTileTop + 1; // calculate the total amount of blocks in this sub-file this.numberOfBlocks = this.blocksWidth * this.blocksHeight; this.indexEndAddress = this.indexStartAddress + this.numberOfBlocks * BYTES_PER_INDEX_ENTRY; } @Override public boolean equals(Object obj) { if (this == obj) { return true; } else if (!(obj instanceof SubFileParameter)) { return false; } SubFileParameter other = (SubFileParameter) obj; if (this.startAddress != other.startAddress) { return false; } else if (this.subFileSize != other.subFileSize) { return false; } else if (this.baseZoomLevel != other.baseZoomLevel) { return false; } return true; } @Override public int hashCode() { return this.hashCodeValue; } /** * @return the hash code of this object. */ private int calculateHashCode() { int result = 7; result = 31 * result + (int) (this.startAddress ^ (this.startAddress >>> 32)); result = 31 * result + (int) (this.subFileSize ^ (this.subFileSize >>> 32)); result = 31 * result + this.baseZoomLevel; return result; } }