IOPlugin: push default method impls to iface

Thank you Java 8.

Author: ctrueden

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

@@ -31,8 +31,6 @@
 
 package org.scijava.io;
 
-import java.io.IOException;
-
 import org.scijava.plugin.AbstractHandlerPlugin;
 
 /**
@@ -43,44 +41,5 @@
 public abstract class AbstractIOPlugin<D> extends AbstractHandlerPlugin<String>
 	implements IOPlugin<D>
 {
-
-	// -- IOPlugin methods --
-
-	@Override
-	public boolean supportsOpen(final String source) {
-		return false;
-	}
-
-	@Override
-	public boolean supportsSave(final String destination) {
-		return false;
-	}
-
-	@Override
-	public boolean supportsSave(final Object data, final String destination) {
-		return supportsSave(destination) && getDataType().isInstance(data);
-	}
-
-	@Override
-	public D open(final String source) throws IOException {
-		throw new UnsupportedOperationException();
-	}
-
-	@Override
-	public void save(final D data, final String destination) throws IOException {
-		throw new UnsupportedOperationException();
-	}
-
-	// -- Typed methods --
-
-	@Override
-	public boolean supports(final String descriptor) {
-		return supportsOpen(descriptor) || supportsSave(descriptor);
-	}
-
-	@Override
-	public Class<String> getType() {
-		return String.class;
-	}
-
+	// NB: No implementation needed.
 }

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

@@ -56,21 +56,46 @@ public interface IOPlugin<D> extends HandlerPlugin<String> {
 	Class<D> getDataType();
 
 	/** Checks whether the I/O plugin can open data from the given source. */
-	boolean supportsOpen(String source);
+	@SuppressWarnings("unused")
+	default boolean supportsOpen(final String source) {
+		return false;
+	}
 
 	/** Checks whether the I/O plugin can save data to the given destination. */
-	boolean supportsSave(String destination);
+	@SuppressWarnings("unused")
+	default boolean supportsSave(final String destination) {
+		return false;
+	}
 
 	/**
 	 * Checks whether the I/O plugin can save the given data to the specified
 	 * destination.
 	 */
-	boolean supportsSave(Object data, String destination);
+	default boolean supportsSave(final Object data, final String destination) {
+		return supportsSave(destination) && getDataType().isInstance(data);
+	}
 
 	/** Opens data from the given source. */
-	D open(String source) throws IOException;
+	@SuppressWarnings("unused")
+	default D open(final String source) throws IOException {
+		throw new UnsupportedOperationException();
+	}
 
 	/** Saves the given data to the specified destination. */
-	void save(D data, String destination) throws IOException;
+	@SuppressWarnings("unused")
+	default void save(final D data, final String destination) throws IOException {
+		throw new UnsupportedOperationException();
+	}
 
+	// -- Typed methods --
+
+	@Override
+	default boolean supports(final String descriptor) {
+		return supportsOpen(descriptor) || supportsSave(descriptor);
+	}
+
+	@Override
+	default Class<String> getType() {
+		return String.class;
+	}
 }