DataHandle: move metadata query methods to the top

We will soon be adding a few more, such as exists() and lastModified().
It makes sense for these basic interrogation methods to be first.

Author: ctrueden

src/main/java/org/scijava/io/handle/BytesHandle.java

@@ -53,6 +53,16 @@ public class BytesHandle extends AbstractDataHandle<BytesLocation> {
 
 	// -- DataHandle methods --
 
+	@Override
+	public boolean isReadable() {
+		return true;
+	}
+
+	@Override
+	public boolean isWritable() {
+		return !bytes().isReadOnly();
+	}
+
 	@Override
 	public long offset() {
 		return offset;
@@ -86,16 +96,6 @@ public void seek(final long pos) throws IOException {
 		offset = pos;
 	}
 
-	@Override
-	public boolean isReadable() {
-		return true;
-	}
-
-	@Override
-	public boolean isWritable() {
-		return !bytes().isReadOnly();
-	}
-
 	// -- DataInput methods --
 
 	@Override

src/main/java/org/scijava/io/handle/DataHandle.java

@@ -65,6 +65,12 @@ public enum ByteOrder {
 	/** Default bound on bytes to search when searching through the stream. */
 	int MAX_SEARCH_SIZE = 512 * 1024 * 1024; // 512 MB
 
+	/** Gets whether reading from this handle is supported. */
+	boolean isReadable();
+
+	/** Gets whether writing to this handle is supported. */
+	boolean isWritable();
+
 	/** Returns the current offset in the stream. */
 	long offset() throws IOException;
 
@@ -116,12 +122,6 @@ default long available(final long count) throws IOException {
 		return remain < count ? remain : count;
 	}
 
-	/** Gets whether reading from this handle is supported. */
-	boolean isReadable();
-
-	/** Gets whether writing to this handle is supported. */
-	boolean isWritable();
-
 	/**
 	 * Ensures that the handle has sufficient bytes available to read.
 	 * 

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

@@ -53,6 +53,16 @@ public class DummyHandle extends AbstractDataHandle<DummyLocation> {
 
 	// -- DataHandle methods --
 
+	@Override
+	public boolean isReadable() {
+		return true;
+	}
+
+	@Override
+	public boolean isWritable() {
+		return true;
+	}
+
 	@Override
 	public long offset() throws IOException {
 		return offset;
@@ -74,16 +84,6 @@ public void setLength(final long length) throws IOException {
 		this.length = length;
 	}
 
-	@Override
-	public boolean isReadable() {
-		return true;
-	}
-
-	@Override
-	public boolean isWritable() {
-		return true;
-	}
-
 	// -- DataInput methods --
 
 	@Override

src/main/java/org/scijava/io/handle/FileHandle.java

@@ -75,28 +75,28 @@ public void setMode(final String mode) {
 	// -- DataHandle methods --
 
 	@Override
-	public long offset() throws IOException {
-		return raf().getFilePointer();
+	public boolean isReadable() {
+		return getMode().contains("r");
 	}
 
 	@Override
-	public long length() throws IOException {
-		return raf().length();
+	public boolean isWritable() {
+		return getMode().contains("w");
 	}
 
 	@Override
-	public void setLength(final long length) throws IOException {
-		raf().setLength(length);
+	public long offset() throws IOException {
+		return raf().getFilePointer();
 	}
 
 	@Override
-	public boolean isReadable() {
-		return getMode().contains("r");
+	public long length() throws IOException {
+		return raf().length();
 	}
 
 	@Override
-	public boolean isWritable() {
-		return getMode().contains("w");
+	public void setLength(final long length) throws IOException {
+		raf().setLength(length);
 	}
 
 	@Override