Difference between revisions of "Databoard Tutorials"
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This document contains a some Java coding snippets for Databoard. | This document contains a some Java coding snippets for Databoard. | ||
| − | + | ==Object Deep-Copy== | |
| − | The binding class can be used for cloning objects. | + | 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"> | <syntaxHighlight lang="java"> | ||
// Binding can copy objects. All copies are deep. | // Binding can copy objects. All copies are deep. | ||
| Line 19: | Line 20: | ||
</syntaxHighlight> | </syntaxHighlight> | ||
| − | + | ==Object Deep-Compare== | |
| − | + | Binding can compare any two instances. The compare function is deep. | |
| − | + | ||
| + | <syntaxHighlight lang="java"> | ||
| + | Binding binding = Bindings.getBindingUnchecked( int[].class ); | ||
| + | |||
| + | int[] array1 = new int[] { 1, 2, 3 }; | ||
| + | int[] array2 = new int[] { 1, 2, 3 }; | ||
| + | int[] array3 = new int[] { 2, 3, 4 }; | ||
| + | |||
| + | if ( binding.compare(array1, array2) == 0 ) { | ||
| + | System.out.println( "array1 is equal to array2" ); | ||
| + | } else { | ||
| + | System.out.println( "array1 is not equal to array2" ); | ||
| + | } | ||
| + | |||
| + | if ( binding.compare(array1, array3) == 0 ) { | ||
| + | System.out.println( "array1 is equal to array3" ); | ||
| + | } else { | ||
| + | System.out.println( "array1 is not equal to array3" ); | ||
| + | } | ||
| + | </syntaxHighlight> | ||
| + | |||
| + | |||
| + | Two bindings can compare instances of same datatype, even if they are of different classes. | ||
| + | <syntaxHighlight lang="java"> | ||
| + | ArrayList<Integer> array4 = new ArrayList<Integer>(); | ||
| + | Binding binding2 = Bindings.getBindingUnchecked( ArrayList.class, Integer.class ); | ||
| + | array4.add( 1 ); | ||
| + | array4.add( 2 ); | ||
| + | array4.add( 3 ); | ||
| + | |||
| + | if ( Bindings.compare(binding, array1, binding2, array4) == 0 ) { | ||
| + | System.out.println( "array1 is equal to array4" ); | ||
| + | } else { | ||
| + | System.out.println( "array1 is not equal to array4" ); | ||
| + | } | ||
| + | </syntaxHighlight> | ||
Revision as of 10:56, 7 September 2011
This document contains a some Java coding snippets for Databoard.
Object Deep-Copy
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. // 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
Binding can compare any two instances. The compare function is deep.
<syntaxHighlight lang="java"> Binding binding = Bindings.getBindingUnchecked( int[].class );
int[] array1 = new int[] { 1, 2, 3 }; int[] array2 = new int[] { 1, 2, 3 }; int[] array3 = new int[] { 2, 3, 4 };
if ( binding.compare(array1, array2) == 0 ) { System.out.println( "array1 is equal to array2" ); } else { System.out.println( "array1 is not equal to array2" ); }
if ( binding.compare(array1, array3) == 0 ) { System.out.println( "array1 is equal to array3" ); } else { System.out.println( "array1 is not equal to array3" ); } </syntaxHighlight>
Two bindings can compare instances of same datatype, even if they are of different classes.
<syntaxHighlight lang="java">
ArrayList<Integer> array4 = new ArrayList<Integer>();
Binding binding2 = Bindings.getBindingUnchecked( ArrayList.class, Integer.class );
array4.add( 1 );
array4.add( 2 );
array4.add( 3 );
if ( Bindings.compare(binding, array1, binding2, array4) == 0 ) { System.out.println( "array1 is equal to array4" ); } else { System.out.println( "array1 is not equal to array4" ); } </syntaxHighlight>
