ucar.multiarray
Class MultiArrayProxy

java.lang.Object
  ucar.multiarray.MultiArrayProxy

All Implemented Interfaces:

Accessor, MultiArray, MultiArrayInfo

public class MultiArrayProxy

extends Object

implements MultiArray

This MultiArray implementation wraps another MultiArray and an IndexMap to provide a different view of the wrapped MultiArray. Indices passed to access methods are passed through a chain of mappings.

See Also:

MultiArray, IndexMap

Constructor Summary

MultiArrayProxy(MultiArray delegate, IndexMap im)
Construct a new proxy.

Method Summary

void	copyin(int[] origin, MultiArray data) Aggregate write access.
MultiArray	copyout(int[] origin, int[] shape) Aggregate read access.
Object	get(int[] index) Get (read) the array element at index.
boolean	getBoolean(int[] index) Get the array element at index, as a boolean.
byte	getByte(int[] index) Get the array element at index, as a byte.
char	getChar(int[] index) Get the array element at index, as a char.
Class	getComponentType() Returns the Class object representing the component type of the array.
double	getDouble(int[] index) Get the array element at index, as a double.
float	getFloat(int[] index) Get the array element at index, as a float.
int	getInt(int[] index) Get the array element at index, as an int.
int[]	getLengths() Returns the shape of the backing MultiArray as transformed by the dimensionsInverseMap() method of the IndexMap.
long	getLong(int[] index) Get the array element at index, as a long.
int	getRank() Returns the number of dimensions of the backing MultiArray, as transformed by the rankInverseMap() method of the IndexMap.
short	getShort(int[] index) Get the array element at index, as a short.
Object	getStorage()
boolean	isScalar() Convenience interface; return true if and only if the rank is zero.
boolean	isUnlimited() Returns true if and only if the effective dimension lengths can change.
static void	main(String[] args)
void	set(int[] index, Object value) Length of index must equal rank() of this.
void	setBoolean(int[] index, boolean value) Set the array element at index to the specified boolean value.
void	setByte(int[] index, byte value) Set the array element at index to the specified byte value.
void	setChar(int[] index, char value) Set the array element at index to the specified char value.
void	setDouble(int[] index, double value) Set the array element at index to the specified double value.
void	setFloat(int[] index, float value) Set the array element at index to the specified float value.
void	setInt(int[] index, int value) Set the array element at index to the specified int value.
void	setLong(int[] index, long value) Set the array element at index to the specified long value.
void	setShort(int[] index, short value) Set the array element at index to the specified short value.
Object	toArray() Returns a new array containing all of the elements in this MultiArray.
Object	toArray(Object dst, int[] origin, int[] shape) Returns an array containing elements of this MultiArray specified by origin and shape, possibly converting the component type.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

MultiArrayProxy

public MultiArrayProxy(MultiArray delegate,
                       IndexMap im)

Construct a new proxy.

Parameters:

delegate - MultiArray backing the proxy view provided.

im - IndexMap defining the proxy view.

Method Detail

getComponentType

public Class getComponentType()

Returns the Class object representing the component type of the array.

Specified by:

getComponentType in interface MultiArrayInfo

Returns:

Class The componentType

See Also:

Class.getComponentType()

getRank

public int getRank()

Returns the number of dimensions of the backing MultiArray, as transformed by the rankInverseMap() method of the IndexMap.

Specified by:

getRank in interface MultiArrayInfo

Returns:

int number of dimensions

getLengths

public int[] getLengths()

Returns the shape of the backing MultiArray as transformed by the dimensionsInverseMap() method of the IndexMap.

Specified by:

getLengths in interface MultiArrayInfo

Returns:

int array whose length is the rank of this MultiArray and whose elements represent the length of each of it's dimensions

isUnlimited

public boolean isUnlimited()

Returns true if and only if the effective dimension lengths can change.

Specified by:

isUnlimited in interface MultiArrayInfo

Returns:

boolean true iff this can grow

isScalar

public boolean isScalar()

Convenience interface; return true if and only if the rank is zero.

Specified by:

isScalar in interface MultiArrayInfo

Returns:

boolean true iff rank == 0

get

public Object get(int[] index)
           throws IOException

Description copied from interface: Accessor

Get (read) the array element at index. The returned value is wrapped in an object if it has a primitive type. Length of index must be greater than or equal to the rank of this. Values of index components must be less than corresponding values from getLengths().

Specified by:

get in interface Accessor

Parameters:

index - MultiArray index

Returns:

Object value at index Length of index must equal rank() of this. Values of index components must be less than corresponding values from getLengths().

Throws:

IOException

getBoolean

public boolean getBoolean(int[] index)
                   throws IOException

Description copied from interface: Accessor

Get the array element at index, as a boolean.

Specified by:

getBoolean in interface Accessor

Throws:

IOException

See Also:

Accessor.get(int[])

getChar

public char getChar(int[] index)
             throws IOException

Description copied from interface: Accessor

Get the array element at index, as a char.

Specified by:

getChar in interface Accessor

Throws:

IOException

See Also:

Accessor.get(int[])

getByte

public byte getByte(int[] index)
             throws IOException

Description copied from interface: Accessor

Get the array element at index, as a byte.

Specified by:

getByte in interface Accessor

Throws:

IOException

See Also:

Accessor.get(int[])

getShort

public short getShort(int[] index)
               throws IOException

Description copied from interface: Accessor

Get the array element at index, as a short.

Specified by:

getShort in interface Accessor

Throws:

IOException

See Also:

Accessor.get(int[])

getInt

public int getInt(int[] index)
           throws IOException

Description copied from interface: Accessor

Get the array element at index, as an int.

Specified by:

getInt in interface Accessor

Throws:

IOException

See Also:

Accessor.get(int[])

getLong

public long getLong(int[] index)
             throws IOException

Description copied from interface: Accessor

Get the array element at index, as a long.

Specified by:

getLong in interface Accessor

Throws:

IOException

See Also:

Accessor.get(int[])

getFloat

public float getFloat(int[] index)
               throws IOException

Description copied from interface: Accessor

Get the array element at index, as a float.

Specified by:

getFloat in interface Accessor

Throws:

IOException

See Also:

Accessor.get(int[])

getDouble

public double getDouble(int[] index)
                 throws IOException

Description copied from interface: Accessor

Get the array element at index, as a double.

Specified by:

getDouble in interface Accessor

Throws:

IOException

See Also:

Accessor.get(int[])

set

public void set(int[] index,
                Object value)
         throws IOException

Length of index must equal rank() of this. Values of index components must be less than corresponding values from getLengths().

Specified by:

set in interface Accessor

Parameters:

index - MultiArray index

value - the new value.

Throws:

IOException

setBoolean

public void setBoolean(int[] index,
                       boolean value)
                throws IOException

Description copied from interface: Accessor

Set the array element at index to the specified boolean value.

Specified by:

setBoolean in interface Accessor

Throws:

IOException

See Also:

Accessor.set(int[], java.lang.Object)

setChar

public void setChar(int[] index,
                    char value)
             throws IOException

Description copied from interface: Accessor

Set the array element at index to the specified char value.

Specified by:

setChar in interface Accessor

Throws:

IOException

See Also:

Accessor.set(int[], java.lang.Object)

setByte

public void setByte(int[] index,
                    byte value)
             throws IOException

Description copied from interface: Accessor

Set the array element at index to the specified byte value.

Specified by:

setByte in interface Accessor

Throws:

IOException

See Also:

Accessor.set(int[], java.lang.Object)

setShort

public void setShort(int[] index,
                     short value)
              throws IOException

Description copied from interface: Accessor

Set the array element at index to the specified short value.

Specified by:

setShort in interface Accessor

Throws:

IOException

See Also:

Accessor.set(int[], java.lang.Object)

setInt

public void setInt(int[] index,
                   int value)
            throws IOException

Description copied from interface: Accessor

Set the array element at index to the specified int value.

Specified by:

setInt in interface Accessor

Throws:

IOException

See Also:

Accessor.set(int[], java.lang.Object)

setLong

public void setLong(int[] index,
                    long value)
             throws IOException

Description copied from interface: Accessor

Set the array element at index to the specified long value.

Specified by:

setLong in interface Accessor

Throws:

IOException

See Also:

Accessor.set(int[], java.lang.Object)

setFloat

public void setFloat(int[] index,
                     float value)
              throws IOException

Description copied from interface: Accessor

Set the array element at index to the specified float value.

Specified by:

setFloat in interface Accessor

Throws:

IOException

See Also:

Accessor.set(int[], java.lang.Object)

setDouble

public void setDouble(int[] index,
                      double value)
               throws IOException

Description copied from interface: Accessor

Set the array element at index to the specified double value.

Specified by:

setDouble in interface Accessor

Throws:

IOException

See Also:

Accessor.set(int[], java.lang.Object)

copyout

public MultiArray copyout(int[] origin,
                          int[] shape)
                   throws IOException

Description copied from interface: Accessor

Aggregate read access. Return a new MultiArray of the same componentType as this, and with shape as specified, which is initialized to the values of this, as clipped to (origin, origin + shape).

It is easier to implement than to specify :-).

The main reason to implement this instead of using the equivalent proxy is for remote or file access.

assert(origin[ii] + shape[ii] <= lengths[ii]);

Specified by:

copyout in interface Accessor

Parameters:

origin - int array specifying the starting index.

shape - int array specifying the extents in each dimension. This becomes the shape of the return.

Returns:

the MultiArray with the specified shape

Throws:

IOException

See Also:

Accessor.copyout(int[], int[])

copyin

public void copyin(int[] origin,
                   MultiArray data)
            throws IOException

Description copied from interface: Accessor

Aggregate write access. Given a MultiArray, copy it into this at the specified starting index. TODO: clearer specification.

Hopefully this member can be optimized in various situations.

assert(origin[ii] + (source.getLengths())[ii] <= (getLengths())[ii]);

Specified by:

copyin in interface Accessor

Parameters:

origin - int array specifying the starting index.

data - MultiArray with the same componentType as this and shape smaller than this.getLengths() - origin

Throws:

IOException

See Also:

Accessor.copyin(int[], ucar.multiarray.MultiArray)

getStorage

public Object getStorage()

Specified by:

getStorage in interface MultiArray

Returns:

a the original one dimensional Array containing all the elements in this MultiArray

toArray

public Object toArray()
               throws IOException

Description copied from interface: Accessor

Returns a new array containing all of the elements in this MultiArray. The returned array is one dimensional. The order of the elements in the result is natural, as if we used an IndexIterator to step through the elements of this MultiArray. The component type of the result is the same as this.

This method acts as bridge between array-based and MultiArray-based APIs.

This method is functionally equivalent to

                Object anArray = Array.newInstance(getComponentType(), 1);
                int [] origin = new int[getRank()]
                int [] shape = getDimensions();
                return toArray(anArray, origin, shape);
 

Specified by:

toArray in interface Accessor

Returns:

a one dimensional Array containing all the elements in this MultiArray

Throws:

IOException

See Also:

TODO: optimize?

toArray

public Object toArray(Object dst,
                      int[] origin,
                      int[] shape)
               throws IOException

Description copied from interface: Accessor

Returns an array containing elements of this MultiArray specified by origin and shape, possibly converting the component type. The returned array is one dimensional. The order of the elements in the result is natural, as if we used an IndexIterator to step through the elements of this MultiArray.

The anArray argument should be an array. If it is large enough to contain the output, it is used and no new storage is allocated. Otherwise, new storage is allocated with the same component type as the argument, and the data is copied into it.

This method acts as bridge between array-based and MultiArray-based APIs.

This method is similar to copyout(origin, shape).toArray(), but avoids a copy operation and (potentially) an allocation.

NOTE: Implementation of type conversion is deferred until JDK 1.2. Currently, the componentType of anArray must be the same as this

Specified by:

toArray in interface Accessor

Returns:

a one dimensional Array containing the specified elements

Throws:

IOException

See Also:

TODO: optimize?

main

public static void main(String[] args)