Databoard Tutorials - Revision history

Toni Kalajainen at 11:17, 7 September 2011

2011-09-07T11:17:55Z

← Older revision		Revision as of 11:17, 7 September 2011
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	<syntaxHighlight lang="java">		<syntaxHighlight lang="java">
	// Binding can copy objects. All copies are deep.		// Binding can copy objects. All copies are deep.
	// Mutable objects are duplicated, immutable are referenced.		// Mutable objects are duplicated, immutable are referenced.

	// For instance, in object array, the array is copied, but its		// For instance, in object array, the array is copied, but its
	// immutable literal instances (e.g. 1) is referenced.		// immutable literal instances (e.g. 1) is referenced.

	Object[] original = new Object[] { 1, "X", 123.456 };		Object[] original = new Object[] { 1, "X", 123.456 };
	Binding binding = Bindings.getBinding( original.getClass() );		Binding binding = Bindings.getBinding( original.getClass() );
	Object[] copy = (Object[]) binding.cloneUnchecked( original );		Object[] copy = (Object[]) binding.cloneUnchecked( original );

	// Print the objects		// Print the objects
	System.out.println( "Original: "+binding.toString( original ) );		System.out.println( "Original: "+binding.toString( original ) );
	System.out.println( "Clone : "+binding.toString( copy ) );		System.out.println( "Clone : "+binding.toString( copy ) );
	</syntaxHighlight>		</syntaxHighlight>

	Recursive classes can also be cloned, but they must be annotated with @Referable tag.		Recursive classes can also be cloned, but they must be annotated with @Referable tag.
	<syntaxHighlight lang="java">		<syntaxHighlight lang="java">
	static @Referable class X {		static @Referable class X {
	public X reference;		public X reference;
	}		}

	public static void main(String[] args) throws BindingConstructionException, BindingException {		public static void main(String[] args) throws BindingConstructionException, BindingException {
	// Create recursive instance		// Create recursive instance
	X original = new X();		X original = new X();
	original.reference = original;		original.reference = original;

	Binding binding = Bindings.getBinding( original.getClass() );		Binding binding = Bindings.getBinding( original.getClass() );
	X copy = (X) binding.cloneUnchecked( original );		X copy = (X) binding.cloneUnchecked( original );

	// Print the objects		// Print the objects
	System.out.println( "Original: "+binding.toString( original ) );		System.out.println( "Original: "+binding.toString( original ) );
	System.out.println( "Clone : "+binding.toString( copy ) );		System.out.println( "Clone : "+binding.toString( copy ) );
	}		}
	</syntaxHighlight>		</syntaxHighlight>

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	<syntaxHighlight lang="java">		<syntaxHighlight lang="java">
	Binding binding = Bindings.getBindingUnchecked( int[].class );		Binding binding = Bindings.getBindingUnchecked( int[].class );

	int[] array1 = new int[] { 1, 2, 3 };		int[] array1 = new int[] { 1, 2, 3 };
	int[] array2 = new int[] { 1, 2, 3 };		int[] array2 = new int[] { 1, 2, 3 };
	int[] array3 = new int[] { 2, 3, 4 };		int[] array3 = new int[] { 2, 3, 4 };

	if ( binding.compare(array1, array2) == 0 ) {		if ( binding.compare(array1, array2) == 0 ) {
	System.out.println( "array1 is equal to array2" );		System.out.println( "array1 is equal to array2" );
	} else {		} else {
	System.out.println( "array1 is not equal to array2" );		System.out.println( "array1 is not equal to array2" );
	}		}

	if ( binding.compare(array1, array3) == 0 ) {		if ( binding.compare(array1, array3) == 0 ) {
	System.out.println( "array1 is equal to array3" );		System.out.println( "array1 is equal to array3" );
	} else {		} else {
	System.out.println( "array1 is not equal to array3" );		System.out.println( "array1 is not equal to array3" );
	}		}
	</syntaxHighlight>		</syntaxHighlight>

Line 66:		Line 66:
	Two bindings can compare instances of same datatype, even if they are of different classes.		Two bindings can compare instances of same datatype, even if they are of different classes.
	<syntaxHighlight lang="java">		<syntaxHighlight lang="java">
	ArrayList<Integer> array4 = new ArrayList<Integer>();		ArrayList<Integer> array4 = new ArrayList<Integer>();
	Binding binding2 = Bindings.getBindingUnchecked( ArrayList.class, Integer.class );		Binding binding2 = Bindings.getBindingUnchecked( ArrayList.class, Integer.class );
	array4.add( 1 );		array4.add( 1 );
	array4.add( 2 );		array4.add( 2 );
	array4.add( 3 );		array4.add( 3 );

	if ( Bindings.compare(binding, array1, binding2, array4) == 0 ) {		if ( Bindings.compare(binding, array1, binding2, array4) == 0 ) {
	System.out.println( "array1 is equal to array4" );		System.out.println( "array1 is equal to array4" );
	} else {		} else {
	System.out.println( "array1 is not equal to array4" );		System.out.println( "array1 is not equal to array4" );
	}		}
	</syntaxHighlight>		</syntaxHighlight>

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	<syntaxHighlight lang="java">		<syntaxHighlight lang="java">
	Binding binding = Bindings.getBindingUnchecked( int[].class );		Binding binding = Bindings.getBindingUnchecked( int[].class );

	int[] array1 = new int[] { 1, 2, 3 };		int[] array1 = new int[] { 1, 2, 3 };
	int[] array2 = new int[] { 1, 2, 3 };		int[] array2 = new int[] { 1, 2, 3 };
	int[] array3 = new int[] { 2, 3, 4 };		int[] array3 = new int[] { 2, 3, 4 };

	System.out.println( "Hashcode for array1 is " + binding.hashValue( array1 ) );		System.out.println( "Hashcode for array1 is " + binding.hashValue( array1 ) );
	System.out.println( "Hashcode for array2 is " + binding.hashValue( array2 ) );		System.out.println( "Hashcode for array2 is " + binding.hashValue( array2 ) );
	System.out.println( "Hashcode for array3 is " + binding.hashValue( array3 ) );		System.out.println( "Hashcode for array3 is " + binding.hashValue( array3 ) );
	</syntaxHighlight>		</syntaxHighlight>

Toni Kalajainen at 11:17, 7 September 2011

2011-09-07T11:17:16Z

@@ Line 11: / Line 11: @@
 		// immutable literal instances (e.g. 1) is referenced.
-		Object[] original = new Object[] { new Object(), 1, "X", 123.456 };
+		Object[] original = new Object[] { 1, "X", 123.456 };
 		Binding binding = Bindings.getBinding( original.getClass() );
 		Object[] copy = (Object[]) binding.cloneUnchecked( original );
@@ Line 18: / Line 18: @@
 		System.out.println( "Original: "+binding.toString( original ) );
 		System.out.println( "Clone   : "+binding.toString( copy     ) );
 </syntaxHighlight>

Toni Kalajainen at 11:09, 7 September 2011

2011-09-07T11:09:04Z

@@ Line 57: / Line 57: @@
 			System.out.println( "array1 is not equal to array4" );
+		}
 </syntaxHighlight>

Toni Kalajainen at 10:56, 7 September 2011

2011-09-07T10:56:42Z

@@ Line 1: / Line 1: @@
 This document contains a some Java coding snippets for Databoard.
-# Object Deep-Copy
+==Object Deep-Copy==
-The binding class can be used for cloning objects. The copies are
+The binding class can be used for cloning objects. All copied objects are deep. Mutable objects are duplicated, and immutable are referenced.
 <syntaxHighlight lang="java">
 		// Binding can copy objects. All copies are deep.
@@ Line 19: / Line 20: @@
 </syntaxHighlight>
+==Object Deep-Compare==
+Binding can compare any two instances. The compare function is deep.
-# Object Deep-Compare

Toni Kalajainen: Created page with "This document contains a some Java coding snippets for Databoard. # Object Deep-Copy The binding class can be used for cloning objects. The copies are
2011-09-07T10:47:48Z

Created page with "This document contains a some Java coding snippets for Databoard. # Object Deep-Copy The binding class can be used for cloning objects. The copies are <syntaxHighlight lang="ja..."

New page
This document contains a some Java coding snippets for Databoard.

# Object Deep-Copy
The binding class can be used for cloning objects. The copies are
<syntaxHighlight lang="java">
// Binding can copy objects. All copies are deep.
// Mutable objects are duplicated, immutable are referenced.

// For instance, in object array, the array is copied, but its
// immutable literal instances (e.g. 1) is referenced.

Object[] original = new Object[] { new Object(), 1, "X", 123.456 };
Binding binding = Bindings.getBinding( original.getClass() );
Object[] copy = (Object[]) binding.cloneUnchecked( original );

// Print the objects
System.out.println( "Original: "+binding.toString( original ) );
System.out.println( "Clone : "+binding.toString( copy ) );
</syntaxHighlight>

# Object Deep-Compare