refactor: hide backend Adapter handles

- static methods for backend adapters

vtm/src/org/oscim/backend/AssetAdapter.java

@@ -27,20 +27,21 @@ import java.io.InputStreamReader;
 public abstract class AssetAdapter {
 
 	/** The instance provided by backend */
-	public static AssetAdapter g;
+	static AssetAdapter g;
 
 	/**
 	 * Open file from asset path as stream.
-	 * 
-	 * @param name the name
-	 * @return the input stream
 	 */
-	public abstract InputStream openFileAsStream(String name);
+	protected abstract InputStream openFileAsStream(String file);
 
-	public String openTextFile(String name) {
+	public static InputStream readFileAsStream(String file) {
+		return g.openFileAsStream(file);
+	}
+
+	public static String readTextFile(String file) {
 		StringBuilder sb = new StringBuilder();
 
-		InputStream is = g.openFileAsStream(name);
+		InputStream is = g.openFileAsStream(file);
 		if (is == null)
 			return null;
 
@@ -55,5 +56,10 @@ public abstract class AssetAdapter {
 		}
 
 		return sb.toString();
+
+	}
+
+	public static void init(AssetAdapter adapter) {
+		g = adapter;
 	}
 }

vtm/src/org/oscim/backend/CanvasAdapter.java

@@ -29,7 +29,7 @@ import org.oscim.backend.canvas.Paint;
 public abstract class CanvasAdapter {
 
 	/** The instance provided by backend */
-	public static CanvasAdapter g;
+	static CanvasAdapter g;
 
 	/** The dpi. */
 	public static float dpi = 240;
@@ -42,14 +42,22 @@ public abstract class CanvasAdapter {
 	 * 
 	 * @return the canvas
 	 */
-	public abstract Canvas getCanvas();
+	protected abstract Canvas newCanvasImpl();
+
+	public static Canvas newCanvas() {
+		return g.newCanvasImpl();
+	}
 
 	/**
 	 * Create Paint.
 	 * 
 	 * @return the paint
 	 */
-	public abstract Paint getPaint();
+	protected abstract Paint newPaintImpl();
+
+	public static Paint newPaint() {
+		return g.newPaintImpl();
+	}
 
 	/**
 	 * Create {@link Bitmap} with given dimensions.
@@ -59,7 +67,11 @@ public abstract class CanvasAdapter {
 	 * @param format the format
 	 * @return the bitmap
 	 */
-	public abstract Bitmap getBitmap(int width, int height, int format);
+	protected abstract Bitmap newBitmapImpl(int width, int height, int format);
+
+	public static Bitmap newBitmap(int width, int height, int format) {
+		return g.newBitmapImpl(width, height, format);
+	}
 
 	/**
 	 * Create {@link Bitmap} from InputStream.
@@ -67,7 +79,11 @@ public abstract class CanvasAdapter {
 	 * @param inputStream the input stream
 	 * @return the bitmap
 	 */
-	public abstract Bitmap decodeBitmap(InputStream inputStream);
+	protected abstract Bitmap decodeBitmapImpl(InputStream inputStream);
+
+	public static Bitmap decodeBitmap(InputStream inputStream) {
+		return g.decodeBitmapImpl(inputStream);
+	}
 
 	/**
 	 * Create {@link Bitmap} from bundled assets.
@@ -75,7 +91,11 @@ public abstract class CanvasAdapter {
 	 * @param fileName the file name
 	 * @return the bitmap
 	 */
-	public abstract Bitmap loadBitmapAsset(String fileName);
+	protected abstract Bitmap loadBitmapAssetImpl(String fileName);
+
+	public static Bitmap getBitmapAsset(String fileName) {
+		return g.loadBitmapAssetImpl(fileName);
+	}
 
 	protected static Bitmap createBitmap(String src) throws IOException {
 		if (src == null || src.length() == 0) {
@@ -89,8 +109,12 @@ public abstract class CanvasAdapter {
 			return null;
 		}
 
-		Bitmap bitmap = CanvasAdapter.g.decodeBitmap(inputStream);
+		Bitmap bitmap = decodeBitmap(inputStream);
 		inputStream.close();
 		return bitmap;
 	}
+
+	protected static void init(CanvasAdapter adapter) {
+		g = adapter;
+	}
 }

vtm/src/org/oscim/renderer/GLShader.java

@@ -45,7 +45,7 @@ public abstract class GLShader {
 
 	public static int loadShader(String file) {
 		String path = "shaders/" + file + ".glsl";
-		String vs = AssetAdapter.g.openTextFile(path);
+		String vs = AssetAdapter.readTextFile(path);
 
 		if (vs == null)
 			throw new IllegalArgumentException("shader file not found: " + path);

vtm/src/org/oscim/renderer/elements/TextLayer.java

@@ -42,7 +42,7 @@ public class TextLayer extends TextureLayer {
 
 	public TextLayer() {
 		super(RenderElement.SYMBOL);
-		mCanvas = CanvasAdapter.g.getCanvas();
+		mCanvas = CanvasAdapter.newCanvas();
 		fixed = true;
 	}
 

vtm/src/org/oscim/renderer/elements/TextureItem.java

@@ -186,7 +186,7 @@ public class TextureItem extends Inlist<TextureItem> {
 			synchronized (mBitmaps) {
 				int size = mBitmaps.size();
 				if (size == 0)
-					t.bitmap = CanvasAdapter.g.getBitmap(mWidth, mHeight, 0);
+					t.bitmap = CanvasAdapter.newBitmap(mWidth, mHeight, 0);
 				else {
 					t.bitmap = mBitmaps.remove(size - 1);
 					t.bitmap.eraseColor(Color.TRANSPARENT);

vtm/src/org/oscim/theme/XmlThemeBuilder.java

@@ -531,7 +531,7 @@ public class XmlThemeBuilder extends DefaultHandler {
 
 		if (src != null) {
 			try {
-				Bitmap bitmap = CanvasAdapter.g.loadBitmapAsset(src);
+				Bitmap bitmap = CanvasAdapter.getBitmapAsset(src);
 				if (bitmap != null)
 					b.texture = new TextureItem(bitmap, true);
 			} catch (Exception e) {
@@ -566,7 +566,7 @@ public class XmlThemeBuilder extends DefaultHandler {
 		}
 		validateExists("img", img, elementName);
 
-		Bitmap bitmap = CanvasAdapter.g.loadBitmapAsset(IMG_PATH + img);
+		Bitmap bitmap = CanvasAdapter.getBitmapAsset(IMG_PATH + img);
 		mTextureAtlas = new TextureAtlas(bitmap);
 	}
 

vtm/src/org/oscim/theme/styles/TextStyle.java

@@ -165,7 +165,7 @@ public final class TextStyle extends RenderStyle {
 		this.priority = tb.priority;
 		this.texture = tb.texture;
 
-		paint = CanvasAdapter.g.getPaint();
+		paint = CanvasAdapter.newPaint();
 		paint.setTextAlign(Align.CENTER);
 		paint.setTypeface(tb.fontFamily, tb.fontStyle);
 
@@ -173,7 +173,7 @@ public final class TextStyle extends RenderStyle {
 		paint.setTextSize(tb.fontSize);
 
 		if (tb.strokeWidth > 0) {
-			stroke = CanvasAdapter.g.getPaint();
+			stroke = CanvasAdapter.newPaint();
 			stroke.setStyle(Paint.Style.STROKE);
 			stroke.setTextAlign(Align.CENTER);
 			stroke.setTypeface(tb.fontFamily, tb.fontStyle);

vtm/src/org/oscim/tiling/source/bitmap/BitmapTileSource.java

@@ -72,7 +72,7 @@ public class BitmapTileSource extends UrlTileSource {
 		public boolean decode(Tile tile, ITileDataSink sink, InputStream is)
 		        throws IOException {
 
-			Bitmap bitmap = CanvasAdapter.g.decodeBitmap(is);
+			Bitmap bitmap = CanvasAdapter.decodeBitmap(is);
 			if (!bitmap.isValid()) {
 				log.debug("{} invalid bitmap", tile);
 				return false;