added prototype for first issue of faster loading

src/main/java/bdv/img/n5/DefaultN5AllEqualProperties.java

@@ -0,0 +1,76 @@
+/*-
+ * #%L
+ * BigDataViewer core classes with minimal dependencies.
+ * %%
+ * Copyright (C) 2012 - 2025 BigDataViewer developers.
+ * %%
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * 
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ * #L%
+ */
+package bdv.img.n5;
+
+import org.janelia.saalfeldlab.n5.DataType;
+import org.janelia.saalfeldlab.n5.N5Reader;
+
+public class DefaultN5AllEqualProperties implements N5Properties
+{
+	@Override
+	public String getDatasetPath( final int setupId, final int timepointId, final int level )
+	{
+		return BdvN5Format.getPathName( setupId, timepointId, level );
+	}
+
+	DataType type = null;
+
+	@Override
+	public DataType getDataType( final N5Reader n5, final int setupId )
+	{
+		final String path = BdvN5Format.getPathName( setupId );
+		if ( type == null )
+			type = n5.getAttribute( path, BdvN5Format.DATA_TYPE_KEY, DataType.class );
+
+		return type;
+	}
+
+	double[][] mm = null;
+
+	@Override
+	public double[][] getMipmapResolutions( final N5Reader n5, final int setupId )
+	{
+		final String path = BdvN5Format.getPathName( setupId );
+		if ( mm == null )
+			mm = n5.getAttribute( path, BdvN5Format.DOWNSAMPLING_FACTORS_KEY, double[][].class );
+		return mm;
+	}
+
+	long[] dim = null;
+
+	@Override
+	public long[] getDimensions( final N5Reader n5, final int setupId, final int timepointId, final int level  )
+	{
+		final String path = getDatasetPath( setupId, timepointId, level );
+		if ( dim == null )
+			dim = n5.getDatasetAttributes( path ).getDimensions();
+
+		return dim;
+	}
+}