Add MapElement as a buffer object to pass map elements to TileGenerator

- unify IMapDatabase callback

src/org/oscim/core/MapElement.java

@@ -0,0 +1,58 @@
+/*
+ * Copyright 2012 Hannes Janetzek
+ *
+ * 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.core;
+
+/**
+ * MapElement is created by MapDatabase(s) and passed to TileGenerator
+ * via IMapDatabaseCallback.renderElement() TileGenerator processes the
+ * data into MapTile.layers.
+ * -----
+ * This is really just a buffer object that belongs to MapDatabase, so
+ * dont keep a reference to it when passed as parameter.
+ */
+public class MapElement extends GeometryBuffer {
+	public static final int GEOM_NONE = 0;
+	public static final int GEOM_POINT = 1;
+	public static final int GEOM_LINE = 2;
+	public static final int GEOM_POLY = 3;
+
+	// osm layer of the way.
+	public int layer;
+	// osm tags of the way.
+	public Tag[] tags;
+	// GEOM_*
+	public int geometryType;
+
+	// ---- random stuff, to be removed ----
+	// building tags
+	public int height;
+	public int minHeight;
+
+	public int priority;
+
+	public MapElement() {
+		super(4096, 128);
+	}
+
+	public MapElement(int points, int indices) {
+		super(points, indices);
+	}
+
+	public void set(Tag[] tags, int layer, int type) {
+		this.layer = layer;
+		this.tags = tags;
+		this.geometryType = type;
+	}
+}