BandedSampleModel (Java Platform SE 8 )
Keywords: java.awt.image.BandedSampleModel class
Date: 2015-05-24

java.awt.image

## Class BandedSampleModel

- java.lang.Object
- - java.awt.image.SampleModel
  - - java.awt.image.ComponentSampleModel
    - - java.awt.image.BandedSampleModel

-     public final class BandedSampleModel
      extends ComponentSampleModel

  This class represents image data which is stored in a band interleaved fashion and for which each sample of a pixel occupies one data element of the DataBuffer. It subclasses ComponentSampleModel but provides a more efficient implementation for accessing band interleaved image data than is provided by ComponentSampleModel. This class should typically be used when working with images which store sample data for each band in a different bank of the DataBuffer. Accessor methods are provided so that image data can be manipulated directly. Pixel stride is the number of data array elements between two samples for the same band on the same scanline. The pixel stride for a BandedSampleModel is one. Scanline stride is the number of data array elements between a given sample and the corresponding sample in the same column of the next scanline. Band offsets denote the number of data array elements from the first data array element of the bank of the DataBuffer holding each band to the first sample of the band. The bands are numbered from 0 to N-1. Bank indices denote the correspondence between a bank of the data buffer and a band of image data. This class supports `TYPE_BYTE`, `TYPE_USHORT`, `TYPE_SHORT`, `TYPE_INT`, `TYPE_FLOAT`, and `TYPE_DOUBLE` datatypes

- - ### Field Summary

    - ### Fields inherited from class java.awt.image.ComponentSampleModel

      `bandOffsets, bankIndices, numBands, numBanks, pixelStride, scanlineStride`

    - ### Fields inherited from class java.awt.image.SampleModel

      `dataType, height, width`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `BandedSampleModel(int dataType, int w, int h, int numBands)` Constructs a BandedSampleModel with the specified parameters.
    `BandedSampleModel(int dataType, int w, int h, int scanlineStride, int[] bankIndices, int[] bandOffsets)` Constructs a BandedSampleModel with the specified parameters.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `SampleModel` | `createCompatibleSampleModel(int w, int h)` Creates a new BandedSampleModel with the specified width and height.
    `DataBuffer` | `createDataBuffer()` Creates a DataBuffer that corresponds to this BandedSampleModel, The DataBuffer's data type, number of banks, and size will be consistent with this BandedSampleModel.
    `SampleModel` | `createSubsetSampleModel(int[] bands)` Creates a new BandedSampleModel with a subset of the bands of this BandedSampleModel.
    `Object` | `getDataElements(int x, int y, Object obj, DataBuffer data)` Returns data for a single pixel in a primitive array of type TransferType.
    `int[]` | `getPixel(int x, int y, int[] iArray, DataBuffer data)` Returns all samples for the specified pixel in an int array.
    `int[]` | `getPixels(int x, int y, int w, int h, int[] iArray, DataBuffer data)` Returns all samples for the specified rectangle of pixels in an int array, one sample per data array element.
    `int` | `getSample(int x, int y, int b, DataBuffer data)` Returns as int the sample in a specified band for the pixel located at (x,y).
    `double` | `getSampleDouble(int x, int y, int b, DataBuffer data)` Returns the sample in a specified band for a pixel located at (x,y) as a double.
    `float` | `getSampleFloat(int x, int y, int b, DataBuffer data)` Returns the sample in a specified band for the pixel located at (x,y) as a float.
    `int[]` | `getSamples(int x, int y, int w, int h, int b, int[] iArray, DataBuffer data)` Returns the samples in a specified band for the specified rectangle of pixels in an int array, one sample per data array element.
    `int` | `hashCode()` Returns a hash code value for the object.
    `void` | `setDataElements(int x, int y, Object obj, DataBuffer data)` Sets the data for a single pixel in the specified DataBuffer from a primitive array of type TransferType.
    `void` | `setPixel(int x, int y, int[] iArray, DataBuffer data)` Sets a pixel in the DataBuffer using an int array of samples for input.
    `void` | `setPixels(int x, int y, int w, int h, int[] iArray, DataBuffer data)` Sets all samples for a rectangle of pixels from an int array containing one sample per array element.
    `void` | `setSample(int x, int y, int b, double s, DataBuffer data)` Sets a sample in the specified band for the pixel located at (x,y) in the DataBuffer using a double for input.
    `void` | `setSample(int x, int y, int b, float s, DataBuffer data)` Sets a sample in the specified band for the pixel located at (x,y) in the DataBuffer using a float for input.
    `void` | `setSample(int x, int y, int b, int s, DataBuffer data)` Sets a sample in the specified band for the pixel located at (x,y) in the DataBuffer using an int for input.
    `void` | `setSamples(int x, int y, int w, int h, int b, int[] iArray, DataBuffer data)` Sets the samples in the specified band for the specified rectangle of pixels from an int array containing one sample per data array element.

    - ### Methods inherited from class java.awt.image.ComponentSampleModel

      `equals, getBandOffsets, getBankIndices, getNumDataElements, getOffset, getOffset, getPixelStride, getSampleSize, getSampleSize, getScanlineStride`

    - ### Methods inherited from class java.awt.image.SampleModel

      `getDataElements, getDataType, getHeight, getNumBands, getPixel, getPixel, getPixels, getPixels, getSamples, getSamples, getTransferType, getWidth, setDataElements, setPixel, setPixel, setPixels, setPixels, setSamples, setSamples`

    - ### Methods inherited from class java.lang.Object

      `clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### BandedSampleModel

          public BandedSampleModel(int dataType,
                                   int w,
                                   int h,
                                   int numBands)

      Constructs a BandedSampleModel with the specified parameters. The pixel stride will be one data element. The scanline stride will be the same as the width. Each band will be stored in a separate bank and all band offsets will be zero.
      Parameters:
        `dataType` - The data type for storing samples.
        `w` - The width (in pixels) of the region of image data described.
        `h` - The height (in pixels) of the region of image data described.
        `numBands` - The number of bands for the image data.
      Throws:
        `IllegalArgumentException` - if `dataType` is not one of the supported data types

    - #### BandedSampleModel

          public BandedSampleModel(int dataType,
                                   int w,
                                   int h,
                                   int scanlineStride,
                                   int[] bankIndices,
                                   int[] bandOffsets)

      Constructs a BandedSampleModel with the specified parameters. The number of bands will be inferred from the lengths of the bandOffsets bankIndices arrays, which must be equal. The pixel stride will be one data element.
      Parameters:
        `dataType` - The data type for storing samples.
        `w` - The width (in pixels) of the region of image data described.
        `h` - The height (in pixels) of the region of image data described.
        `scanlineStride` - The line stride of the of the image data.
        `bankIndices` - The bank index for each band.
        `bandOffsets` - The band offset for each band.
      Throws:
        `IllegalArgumentException` - if `dataType` is not one of the supported data types

  - ### Method Detail

    - #### createCompatibleSampleModel

          public SampleModel createCompatibleSampleModel(int w,
                                                         int h)

      Creates a new BandedSampleModel with the specified width and height. The new BandedSampleModel will have the same number of bands, storage data type, and bank indices as this BandedSampleModel. The band offsets will be compressed such that the offset between bands will be w*pixelStride and the minimum of all of the band offsets is zero.
      Overrides:
        `createCompatibleSampleModel` in class `ComponentSampleModel`
      Parameters:
        `w` - the width of the resulting `BandedSampleModel`
        `h` - the height of the resulting `BandedSampleModel`
      Returns:
        a new `BandedSampleModel` with the specified width and height.
      Throws:
        `IllegalArgumentException` - if `w` or `h` equals either `Integer.MAX_VALUE` or `Integer.MIN_VALUE`
        `IllegalArgumentException` - if `dataType` is not one of the supported data types

    - #### createSubsetSampleModel

          public SampleModel createSubsetSampleModel(int[] bands)

      Creates a new BandedSampleModel with a subset of the bands of this BandedSampleModel. The new BandedSampleModel can be used with any DataBuffer that the existing BandedSampleModel can be used with. The new BandedSampleModel/DataBuffer combination will represent an image with a subset of the bands of the original BandedSampleModel/DataBuffer combination.
      Overrides:
        `createSubsetSampleModel` in class `ComponentSampleModel`
      Parameters:
        `bands` - a subset of bands from this `ComponentSampleModel`
      Returns:
        a `ComponentSampleModel` created with a subset of bands from this `ComponentSampleModel`.
      Throws:
        `RasterFormatException` - if the number of bands is greater than the number of banks in this sample model.
        `IllegalArgumentException` - if `dataType` is not one of the supported data types

    - #### createDataBuffer

          public DataBuffer createDataBuffer()

      Creates a DataBuffer that corresponds to this BandedSampleModel, The DataBuffer's data type, number of banks, and size will be consistent with this BandedSampleModel.
      Overrides:
        `createDataBuffer` in class `ComponentSampleModel`
      Returns:
        a `DataBuffer` whose data type, number of banks and size are consistent with this `ComponentSampleModel`.
      Throws:
        `IllegalArgumentException` - if `dataType` is not one of the supported types.

    - #### getDataElements

          public Object getDataElements(int x,
                                        int y,
                                        Object obj,
                                        DataBuffer data)

      Returns data for a single pixel in a primitive array of type TransferType. For a BandedSampleModel, this will be the same as the data type, and samples will be returned one per array element. Generally, obj should be passed in as null, so that the Object will be created automatically and will be of the right primitive data type.

      The following code illustrates transferring data for one pixel from DataBuffer `db1`, whose storage layout is described by BandedSampleModel `bsm1`, to DataBuffer `db2`, whose storage layout is described by BandedSampleModel `bsm2`. The transfer will generally be more efficient than using getPixel/setPixel.

                 BandedSampleModel bsm1, bsm2;
                 DataBufferInt db1, db2;
                 bsm2.setDataElements(x, y, bsm1.getDataElements(x, y, null, db1),
                                      db2);

      Using getDataElements/setDataElements to transfer between two DataBuffer/SampleModel pairs is legitimate if the SampleModels have the same number of bands, corresponding bands have the same number of bits per sample, and the TransferTypes are the same.

      If obj is non-null, it should be a primitive array of type TransferType. Otherwise, a ClassCastException is thrown. An ArrayIndexOutOfBoundsException may be thrown if the coordinates are not in bounds, or if obj is non-null and is not large enough to hold the pixel data.

      Overrides:
        `getDataElements` in class `ComponentSampleModel`
      Parameters:
        `x` - The X coordinate of the pixel location
        `y` - The Y coordinate of the pixel location
        `obj` - If non-null, a primitive array in which to return the pixel data.
        `data` - The DataBuffer containing the image data.
      Returns:
        the data for the specified pixel.
      See Also:
        `setDataElements(int, int, Object, DataBuffer)`

    - #### getPixel

          public int[] getPixel(int x,
                                int y,
                                int[] iArray,
                                DataBuffer data)

      Returns all samples for the specified pixel in an int array. ArrayIndexOutOfBoundsException may be thrown if the coordinates are not in bounds.
      Overrides:
        `getPixel` in class `ComponentSampleModel`
      Parameters:
        `x` - The X coordinate of the pixel location
        `y` - The Y coordinate of the pixel location
        `iArray` - If non-null, returns the samples in this array
        `data` - The DataBuffer containing the image data
      Returns:
        the samples for the specified pixel.
      See Also:
        `setPixel(int, int, int[], DataBuffer)`

    - #### getPixels

          public int[] getPixels(int x,
                                 int y,
                                 int w,
                                 int h,
                                 int[] iArray,
                                 DataBuffer data)

      Returns all samples for the specified rectangle of pixels in an int array, one sample per data array element. ArrayIndexOutOfBoundsException may be thrown if the coordinates are not in bounds.
      Overrides:
        `getPixels` in class `ComponentSampleModel`
      Parameters:
        `x` - The X coordinate of the upper left pixel location
        `y` - The Y coordinate of the upper left pixel location
        `w` - The width of the pixel rectangle
        `h` - The height of the pixel rectangle
        `iArray` - If non-null, returns the samples in this array
        `data` - The DataBuffer containing the image data
      Returns:
        the samples for the pixels within the specified region.
      See Also:
        `setPixels(int, int, int, int, int[], DataBuffer)`

    - #### getSample

          public int getSample(int x,
                               int y,
                               int b,
                               DataBuffer data)

      Returns as int the sample in a specified band for the pixel located at (x,y). ArrayIndexOutOfBoundsException may be thrown if the coordinates are not in bounds.
      Overrides:
        `getSample` in class `ComponentSampleModel`
      Parameters:
        `x` - The X coordinate of the pixel location
        `y` - The Y coordinate of the pixel location
        `b` - The band to return
        `data` - The DataBuffer containing the image data
      Returns:
        the sample in the specified band for the specified pixel.
      See Also:
        `setSample(int, int, int, int, DataBuffer)`

    - #### getSampleFloat

          public float getSampleFloat(int x,
                                      int y,
                                      int b,
                                      DataBuffer data)

      Returns the sample in a specified band for the pixel located at (x,y) as a float. ArrayIndexOutOfBoundsException may be thrown if the coordinates are not in bounds.
      Overrides:
        `getSampleFloat` in class `ComponentSampleModel`
      Parameters:
        `x` - The X coordinate of the pixel location
        `y` - The Y coordinate of the pixel location
        `b` - The band to return
        `data` - The DataBuffer containing the image data
      Returns:
        a float value that represents the sample in the specified band for the specified pixel.

    - #### getSampleDouble

          public double getSampleDouble(int x,
                                        int y,
                                        int b,
                                        DataBuffer data)

      Returns the sample in a specified band for a pixel located at (x,y) as a double. ArrayIndexOutOfBoundsException may be thrown if the coordinates are not in bounds.
      Overrides:
        `getSampleDouble` in class `ComponentSampleModel`
      Parameters:
        `x` - The X coordinate of the pixel location
        `y` - The Y coordinate of the pixel location
        `b` - The band to return
        `data` - The DataBuffer containing the image data
      Returns:
        a double value that represents the sample in the specified band for the specified pixel.

    - #### getSamples

          public int[] getSamples(int x,
                                  int y,
                                  int w,
                                  int h,
                                  int b,
                                  int[] iArray,
                                  DataBuffer data)

      Returns the samples in a specified band for the specified rectangle of pixels in an int array, one sample per data array element. ArrayIndexOutOfBoundsException may be thrown if the coordinates are not in bounds.
      Overrides:
        `getSamples` in class `ComponentSampleModel`
      Parameters:
        `x` - The X coordinate of the upper left pixel location
        `y` - The Y coordinate of the upper left pixel location
        `w` - The width of the pixel rectangle
        `h` - The height of the pixel rectangle
        `b` - The band to return
        `iArray` - If non-null, returns the samples in this array
        `data` - The DataBuffer containing the image data
      Returns:
        the samples in the specified band for the pixels within the specified region.
      See Also:
        `setSamples(int, int, int, int, int, int[], DataBuffer)`

    - #### setDataElements

          public void setDataElements(int x,
                                      int y,
                                      Object obj,
                                      DataBuffer data)

      Sets the data for a single pixel in the specified DataBuffer from a primitive array of type TransferType. For a BandedSampleModel, this will be the same as the data type, and samples are transferred one per array element.

      The following code illustrates transferring data for one pixel from DataBuffer `db1`, whose storage layout is described by BandedSampleModel `bsm1`, to DataBuffer `db2`, whose storage layout is described by BandedSampleModel `bsm2`. The transfer will generally be more efficient than using getPixel/setPixel.

                 BandedSampleModel bsm1, bsm2;
                 DataBufferInt db1, db2;
                 bsm2.setDataElements(x, y, bsm1.getDataElements(x, y, null, db1),
                                      db2);

      Using getDataElements/setDataElements to transfer between two DataBuffer/SampleModel pairs is legitimate if the SampleModels have the same number of bands, corresponding bands have the same number of bits per sample, and the TransferTypes are the same.

      obj must be a primitive array of type TransferType. Otherwise, a ClassCastException is thrown. An ArrayIndexOutOfBoundsException may be thrown if the coordinates are not in bounds, or if obj is not large enough to hold the pixel data.

      Overrides:
        `setDataElements` in class `ComponentSampleModel`
      Parameters:
        `x` - The X coordinate of the pixel location
        `y` - The Y coordinate of the pixel location
        `obj` - If non-null, returns the primitive array in this object
        `data` - The DataBuffer containing the image data
      See Also:
        `getDataElements(int, int, Object, DataBuffer)`

    - #### setPixel

          public void setPixel(int x,
                               int y,
                               int[] iArray,
                               DataBuffer data)

      Sets a pixel in the DataBuffer using an int array of samples for input. ArrayIndexOutOfBoundsException may be thrown if the coordinates are not in bounds.
      Overrides:
        `setPixel` in class `ComponentSampleModel`
      Parameters:
        `x` - The X coordinate of the pixel location
        `y` - The Y coordinate of the pixel location
        `iArray` - The input samples in an int array
        `data` - The DataBuffer containing the image data
      See Also:
        `getPixel(int, int, int[], DataBuffer)`

    - #### setPixels

          public void setPixels(int x,
                                int y,
                                int w,
                                int h,
                                int[] iArray,
                                DataBuffer data)

      Sets all samples for a rectangle of pixels from an int array containing one sample per array element. ArrayIndexOutOfBoundsException may be thrown if the coordinates are not in bounds.
      Overrides:
        `setPixels` in class `ComponentSampleModel`
      Parameters:
        `x` - The X coordinate of the upper left pixel location
        `y` - The Y coordinate of the upper left pixel location
        `w` - The width of the pixel rectangle
        `h` - The height of the pixel rectangle
        `iArray` - The input samples in an int array
        `data` - The DataBuffer containing the image data
      See Also:
        `getPixels(int, int, int, int, int[], DataBuffer)`

    - #### setSample

          public void setSample(int x,
                                int y,
                                int b,
                                int s,
                                DataBuffer data)

      Sets a sample in the specified band for the pixel located at (x,y) in the DataBuffer using an int for input. ArrayIndexOutOfBoundsException may be thrown if the coordinates are not in bounds.
      Overrides:
        `setSample` in class `ComponentSampleModel`
      Parameters:
        `x` - The X coordinate of the pixel location
        `y` - The Y coordinate of the pixel location
        `b` - The band to set
        `s` - The input sample as an int
        `data` - The DataBuffer containing the image data
      See Also:
        `getSample(int, int, int, DataBuffer)`

    - #### setSample

          public void setSample(int x,
                                int y,
                                int b,
                                float s,
                                DataBuffer data)

      Sets a sample in the specified band for the pixel located at (x,y) in the DataBuffer using a float for input. ArrayIndexOutOfBoundsException may be thrown if the coordinates are not in bounds.
      Overrides:
        `setSample` in class `ComponentSampleModel`
      Parameters:
        `x` - The X coordinate of the pixel location
        `y` - The Y coordinate of the pixel location
        `b` - The band to set
        `s` - The input sample as a float
        `data` - The DataBuffer containing the image data
      See Also:
        `getSample(int, int, int, DataBuffer)`

    - #### setSample

          public void setSample(int x,
                                int y,
                                int b,
                                double s,
                                DataBuffer data)

      Sets a sample in the specified band for the pixel located at (x,y) in the DataBuffer using a double for input. ArrayIndexOutOfBoundsException may be thrown if the coordinates are not in bounds.
      Overrides:
        `setSample` in class `ComponentSampleModel`
      Parameters:
        `x` - The X coordinate of the pixel location
        `y` - The Y coordinate of the pixel location
        `b` - The band to set
        `s` - The input sample as a double
        `data` - The DataBuffer containing the image data
      See Also:
        `getSample(int, int, int, DataBuffer)`

    - #### setSamples

          public void setSamples(int x,
                                 int y,
                                 int w,
                                 int h,
                                 int b,
                                 int[] iArray,
                                 DataBuffer data)

      Sets the samples in the specified band for the specified rectangle of pixels from an int array containing one sample per data array element. ArrayIndexOutOfBoundsException may be thrown if the coordinates are not in bounds.
      Overrides:
        `setSamples` in class `ComponentSampleModel`
      Parameters:
        `x` - The X coordinate of the upper left pixel location
        `y` - The Y coordinate of the upper left pixel location
        `w` - The width of the pixel rectangle
        `h` - The height of the pixel rectangle
        `b` - The band to set
        `iArray` - The input sample array
        `data` - The DataBuffer containing the image data
      See Also:
        `getSamples(int, int, int, int, int, int[], DataBuffer)`

    - #### hashCode

          public int hashCode()

      Description copied from class: `Object`
      Returns a hash code value for the object. This method is supported for the benefit of hash tables such as those provided by `HashMap`.

      The general contract of `hashCode` is:

      - Whenever it is invoked on the same object more than once during an execution of a Java application, the `hashCode` method must consistently return the same integer, provided no information used in `equals` comparisons on the object is modified. This integer need not remain consistent from one execution of an application to another execution of the same application.
      - If two objects are equal according to the `equals(Object)` method, then calling the `hashCode` method on each of the two objects must produce the same integer result.
      - It is not required that if two objects are unequal according to the `Object.equals(java.lang.Object)` method, then calling the `hashCode` method on each of the two objects must produce distinct integer results. However, the programmer should be aware that producing distinct integer results for unequal objects may improve the performance of hash tables.

      As much as is reasonably practical, the hashCode method defined by class `Object` does return distinct integers for distinct objects. (This is typically implemented by converting the internal address of the object into an integer, but this implementation technique is not required by the Java™ programming language.)

      Overrides:
        `hashCode` in class `ComponentSampleModel`
      Returns:
        a hash code value for this object.
      See Also:
        `Object.equals(java.lang.Object)`, `System.identityHashCode(java.lang.Object)`

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