Add DummyLocation and DummyHandle

Author: ctrueden

src/main/java/org/scijava/io/DummyHandle.java

@@ -0,0 +1,133 @@
+/*
+ * #%L
+ * SciJava Common shared library for SciJava software.
+ * %%
+ * Copyright (C) 2009 - 2017 Board of Regents of the University of
+ * Wisconsin-Madison, Broad Institute of MIT and Harvard, and Max Planck
+ * Institute of Molecular Cell Biology and Genetics.
+ * %%
+ * 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 org.scijava.io;
+
+import java.io.IOException;
+import java.util.Arrays;
+
+import org.scijava.plugin.Plugin;
+
+/**
+ * A {@link DataHandle} which reads all zeroes, and writes no actual data.
+ *
+ * @author Curtis Rueden
+ */
+@Plugin(type = DataHandle.class)
+public class DummyHandle extends AbstractDataHandle<DummyLocation> {
+
+	// -- Fields --
+
+	private long offset;
+	private long length;
+
+	// -- DataHandle methods --
+
+	@Override
+	public long offset() throws IOException {
+		return offset;
+	}
+
+	@Override
+	public void seek(final long pos) throws IOException {
+		if (pos > length()) setLength(pos);
+		offset = pos;
+	}
+
+	@Override
+	public long length() throws IOException {
+		return length;
+	}
+
+	@Override
+	public void setLength(final long length) throws IOException {
+		this.length = length;
+	}
+
+	@Override
+	public boolean isReadable() {
+		return true;
+	}
+
+	@Override
+	public boolean isWritable() {
+		return true;
+	}
+
+	@Override
+	public byte readByte() throws IOException {
+		final long r = available(1);
+		if (r <= 0) return -1;
+		offset++;
+		return 0;
+	}
+
+	@Override
+	public int read(final byte[] b, final int off, final int len)
+		throws IOException
+	{
+		final int r = (int) available(len);
+		offset += r;
+		Arrays.fill(b, off, off + r, (byte) 0);
+		return r;
+	}
+
+	// -- DataOutput methods --
+
+	@Override
+	public void write(final int v) throws IOException {
+		ensureWritable(1);
+		offset++;
+	}
+
+	@Override
+	public void write(final byte[] b, final int off, final int len)
+		throws IOException
+	{
+		ensureWritable(len);
+		offset += len;
+	}
+
+	// -- Closeable methods --
+
+	@Override
+	public void close() {
+		// NB: No action needed.
+	}
+
+	// -- Typed methods --
+
+	@Override
+	public Class<DummyLocation> getType() {
+		return DummyLocation.class;
+	}
+
+}

src/main/java/org/scijava/io/DummyLocation.java

@@ -0,0 +1,42 @@
+/*
+ * #%L
+ * SciJava Common shared library for SciJava software.
+ * %%
+ * Copyright (C) 2009 - 2016 Board of Regents of the University of
+ * Wisconsin-Madison, Broad Institute of MIT and Harvard, and Max Planck
+ * Institute of Molecular Cell Biology and Genetics.
+ * %%
+ * 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 org.scijava.io;
+
+/**
+ * {@link Location} backed by nothing whatsoever.
+ *
+ * @author Curtis Rueden
+ * @see DummyHandle
+ */
+public class DummyLocation extends AbstractLocation {
+	// NB: No implementation needed.
+}