/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2001-2015, Open Source Geospatial Foundation (OSGeo)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*/
package org.geotools.coverage.grid;
import java.awt.Point;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import java.awt.image.DataBuffer;
import java.awt.image.Raster;
import java.awt.image.RenderedImage;
import java.awt.image.WritableRenderedImage;
import java.awt.image.renderable.RenderableImage;
import java.io.IOException;
import java.io.InvalidClassException;
import java.io.InvalidObjectException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.lang.reflect.Field;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.EnumSet;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.LogRecord;
import javax.measure.unit.Unit;
import javax.media.jai.Interpolation;
import javax.media.jai.OperationNode;
import javax.media.jai.PlanarImage;
import javax.media.jai.RenderedImageAdapter;
import javax.media.jai.remote.SerializableRenderedImage;
import org.geotools.coverage.AbstractCoverage;
import org.geotools.coverage.GridSampleDimension;
import org.geotools.factory.Hints;
import org.geotools.geometry.Envelope2D;
import org.geotools.resources.Classes;
import org.geotools.resources.coverage.CoverageUtilities;
import org.geotools.resources.i18n.ErrorKeys;
import org.geotools.resources.i18n.Errors;
import org.geotools.resources.i18n.LoggingKeys;
import org.geotools.resources.i18n.Loggings;
import org.opengis.coverage.CannotEvaluateException;
import org.opengis.coverage.PointOutsideCoverageException;
import org.opengis.coverage.SampleDimension;
import org.opengis.coverage.grid.GridCoverage;
import org.opengis.coverage.grid.GridEnvelope;
import org.opengis.geometry.DirectPosition;
import org.opengis.geometry.Envelope;
import org.opengis.referencing.crs.CoordinateReferenceSystem;
import org.opengis.referencing.datum.PixelInCell;
/**
* Basic access to grid data values backed by a two-dimensional
* {@linkplain RenderedImage rendered image}. Each band in an image is represented as a
* {@linkplain GridSampleDimension sample dimension}.
* <p>
* Grid coverages are usually two-dimensional. However, {@linkplain #getEnvelope their envelope}
* may have more than two dimensions. For example, a remote sensing image may be valid only over
* some time range (the time of satellite pass over the observed area). Envelopes for such grid
* coverage can have three dimensions: the two usual ones (horizontal extent along <var>x</var>
* and <var>y</var>), and a third one for start time and end time (time extent along <var>t</var>).
* However, the {@linkplain GeneralGridRange grid range} for all extra-dimension <strong>must</strong>
* have a {@linkplain GeneralGridRange#getLength size} not greater than 1. In other words, a
* {@code GridCoverage2D} can be a slice in a 3 dimensional grid coverage. Each slice can have an
* arbitrary width and height (like any two-dimensional images), but only 1 voxel depth (a "voxel"
* is a three-dimensional pixel).
* <p>
* <strong>Serialization note:</strong><br>
* Because it is serializable, {@code GridCoverage2D} can be included as method argument or as
* return type in <cite>Remote Method Invocation</cite> (RMI). However, the pixel data are not
* sent during serialization. Instead, the image data are transmitted "on-demand" using socket
* communications. This mechanism is implemented using JAI {@link SerializableRenderedImage}
* class. While serialization (usually on server side) should work on J2SE 1.4 and above,
* deserialization (usually on client side) of {@code GridCoverage2D} instances requires J2SE 1.5.
*
* @since 2.1
*
*
* @source $URL$
* @version $Id$
* @author Martin Desruisseaux (IRD)
*/
public class GridCoverage2D extends AbstractGridCoverage {
/**
* For compatibility during cross-version serialization.
*/
private static final long serialVersionUID = 667472989475027853L;
/**
* Whatever default grid range computation should be performed on transform
* relative to pixel center or relative to pixel corner. The former is OGC
* convention while the later is Java convention.
*/
private static final PixelInCell PIXEL_IN_CELL = PixelInCell.CELL_CORNER;
/**
* The raster data.
*/
protected transient final PlanarImage image;
/**
* The serialized image, as an instance of {@link SerializableRenderedImage}.
* This image will be created only when first needed during serialization.
*/
private RenderedImage serializedImage;
/**
* The grid geometry.
*/
protected final GridGeometry2D gridGeometry;
/**
* List of sample dimension information for the grid coverage.
* For a grid coverage, a sample dimension is a band. The sample dimension information
* include such things as description, data type of the value (bit, byte, integer...),
* the no data values, minimum and maximum values and a color table if one is associated
* with the dimension. A coverage must have at least one sample dimension.
* <p>
* The content of this array should never be modified.
*/
final GridSampleDimension[] sampleDimensions;
/**
* The preferred encoding to use for serialization using the {@code writeObject} method,
* or {@code null} for the default encoding. This value is set by {@link GridCoverageFactory}
* according the hints provided to the factory.
*/
transient String tileEncoding;
/**
* Constructs a new grid coverage with the same parameter than the specified
* coverage. This constructor is useful when creating a coverage with
* identical data, but in which some method has been overridden in order to
* process data differently (e.g. interpolating them).
*
* @param name The name for this coverage, or {@code null} for the same than {@code coverage}.
* @param coverage The source grid coverage.
*
*/
public GridCoverage2D(final CharSequence name,
final GridCoverage2D coverage)
{
super(name, coverage);
image = coverage.image;
gridGeometry = coverage.gridGeometry;
sampleDimensions = coverage.sampleDimensions;
tileEncoding = coverage.tileEncoding;
// Do not share the views, since subclasses will create different instances.
}
/**
* Constructs a grid coverage with the specified {@linkplain GridGeometry2D grid geometry} and
* {@linkplain GridSampleDimension sample dimensions}. The {@linkplain Envelope envelope}
* (including the {@linkplain CoordinateReferenceSystem coordinate reference system}) is
* inferred from the grid geometry.
* <p>
* This constructor accepts an optional set of properties. Keys are {@link String} objects
* ({@link javax.media.jai.util.CaselessStringKey} are accepted as well), while values may
* be any {@link Object}.
*
* @param name
* The grid coverage name.
* @param image
* The image.
* @param gridGeometry
* The grid geometry (must contains an {@linkplain GridGeometry2D#getEnvelope envelope}
* with its {@linkplain GridGeometry2D#getCoordinateReferenceSystem coordinate reference
* system} and a "{@linkplain GridGeometry2D#getGridToCoordinateSystem grid to CRS}"
* transform).
* @param bands
* Sample dimensions for each image band, or {@code null} for default sample dimensions.
* If non-null, then this array's length must matches the number of bands in {@code image}.
* @param sources
* The sources for this grid coverage, or {@code null} if none.
* @param properties
* The set of properties for this coverage, or {@code null} none.
* @param hints
* An optional set of hints, or {@code null} if none.
* @throws IllegalArgumentException
* If the number of bands differs from the number of sample dimensions.
*
* @since 2.5
*/
protected GridCoverage2D(final CharSequence name,
final PlanarImage image,
GridGeometry2D gridGeometry,
final GridSampleDimension[] bands,
final GridCoverage[] sources,
final Map<?,?> properties,
final Hints hints)
throws IllegalArgumentException
{
super(name, gridGeometry.getCoordinateReferenceSystem(), sources, image, properties);
this.image = image;
/*
* Wraps the user-supplied sample dimensions into instances of RenderedSampleDimension. This
* process will creates default sample dimensions if the user supplied null values. Those
* default will be inferred from image type (integers, floats...) and range of values. If
* an inconsistency is found in user-supplied sample dimensions, an IllegalArgumentException
* is thrown.
*/
sampleDimensions = new GridSampleDimension[image.getNumBands()];
RenderedSampleDimension.create(name, image, bands, sampleDimensions);
/*
* Computes the grid range if it was not explicitly provided. The range will be inferred
* from the image size, if needed. The envelope computation (if needed) requires a valid
* 'gridToCRS' transform in the GridGeometry object. In any case, the envelope must be
* non-empty and its dimension must matches the coordinate reference system's dimension.
*/
final int dimension = crs.getCoordinateSystem().getDimension();
if (!gridGeometry.isDefined(GridGeometry2D.GRID_RANGE_BITMASK)) {
final GridEnvelope r = new GeneralGridEnvelope(image, dimension);
if (gridGeometry.isDefined(GridGeometry2D.GRID_TO_CRS_BITMASK)) {
gridGeometry = new GridGeometry2D(r, PIXEL_IN_CELL,
gridGeometry.getGridToCRS(PIXEL_IN_CELL), crs, hints);
} else {
/*
* If the math transform was not explicitly specified by the user, then it will be
* computed from the envelope. In this case, some heuristic rules are used in order
* to decide if we should reverse some axis directions or swap axis.
*/
gridGeometry = new GridGeometry2D(r, gridGeometry.getEnvelope());
}
} else {
/*
* Makes sure that the 'gridToCRS' transform is defined.
* An exception will be thrown otherwise.
*/
gridGeometry.getGridToCRS();
}
this.gridGeometry = gridGeometry;
assert gridGeometry.isDefined(GridGeometry2D.CRS_BITMASK |
GridGeometry2D.ENVELOPE_BITMASK |
GridGeometry2D.GRID_RANGE_BITMASK |
GridGeometry2D.GRID_TO_CRS_BITMASK);
/*
* Last argument checks. The image size must be consistent with the grid range
* and the envelope must be non-empty.
*/
final String error = GridGeometry2D.checkConsistency(image, gridGeometry);
if (error != null) {
throw new IllegalArgumentException(error);
}
if (dimension <= Math.max(gridGeometry.axisDimensionX, gridGeometry.axisDimensionY)
|| !(gridGeometry.envelope.getSpan(gridGeometry.axisDimensionX) > 0)
|| !(gridGeometry.envelope.getSpan(gridGeometry.axisDimensionY) > 0))
{
throw new IllegalArgumentException(Errors.format(ErrorKeys.EMPTY_ENVELOPE));
}
}
/**
* Returns {@code true} if grid data can be edited. The default
* implementation returns {@code true} if {@link #image} is an
* instance of {@link WritableRenderedImage}.
*/
@Override
public boolean isDataEditable() {
return (image instanceof WritableRenderedImage);
}
/**
* Returns information for the grid coverage geometry. Grid geometry
* includes the valid range of grid coordinates and the georeferencing.
*/
public GridGeometry2D getGridGeometry() {
final String error = GridGeometry2D.checkConsistency(image, gridGeometry);
if (error != null) {
throw new IllegalStateException(error);
}
return gridGeometry;
}
/**
* Returns the bounding box for the coverage domain in coordinate reference system coordinates.
* The returned envelope have at least two dimensions. It may have more dimensions if the
* coverage has some extent in other dimensions (for example a depth, or a start and end time).
*/
@Override
public Envelope getEnvelope() {
return gridGeometry.getEnvelope();
}
/**
* Returns the two-dimensional bounding box for the coverage domain in coordinate reference
* system coordinates. If the coverage envelope has more than two dimensions, only the
* dimensions used in the underlying rendered image are returned.
*
* @return The two-dimensional bounding box.
*/
public Envelope2D getEnvelope2D() {
return gridGeometry.getEnvelope2D();
}
/**
* Returns the two-dimensional part of this grid coverage CRS. If the
* {@linkplain #getCoordinateReferenceSystem complete CRS} is two-dimensional, then this
* method returns the same CRS. Otherwise it returns a CRS for the two first axis having
* a {@linkplain GridRange#length length} greater than 1 in the grid range. Note that those
* axis are garanteed to appears in the same order than in the complete CRS.
*
* @return The two-dimensional part of the grid coverage CRS.
*
* @see #getCoordinateReferenceSystem
*/
public CoordinateReferenceSystem getCoordinateReferenceSystem2D() {
return gridGeometry.getCoordinateReferenceSystem2D();
}
/**
* Returns the number of bands in the grid coverage.
*/
public int getNumSampleDimensions() {
return sampleDimensions.length;
}
/**
* Retrieve sample dimension information for the coverage.
* For a grid coverage, a sample dimension is a band. The sample dimension information
* include such things as description, data type of the value (bit, byte, integer...),
* the no data values, minimum and maximum values and a color table if one is associated
* with the dimension. A coverage must have at least one sample dimension.
*/
public GridSampleDimension getSampleDimension(final int index) {
return sampleDimensions[index];
}
/**
* Returns all sample dimensions for this grid coverage.
*
* @return All sample dimensions.
*/
public GridSampleDimension[] getSampleDimensions() {
return sampleDimensions.clone();
}
/**
* Returns the interpolation used for all {@code evaluate(...)} methods.
* The default implementation returns {@link javax.media.jai.InterpolationNearest}.
*
* @return The interpolation.
*/
public Interpolation getInterpolation() {
return Interpolation.getInstance(Interpolation.INTERP_NEAREST);
}
/**
* Returns the value vector for a given location (world coordinates).
* A value for each sample dimension is included in the vector.
*/
public Object evaluate(final DirectPosition point) throws CannotEvaluateException {
final int dataType = image.getSampleModel().getDataType();
switch (dataType) {
case DataBuffer.TYPE_BYTE: return evaluate(point, (byte []) null);
case DataBuffer.TYPE_SHORT: // Fall through
case DataBuffer.TYPE_USHORT: // Fall through
case DataBuffer.TYPE_INT: return evaluate(point, (int []) null);
case DataBuffer.TYPE_FLOAT: return evaluate(point, (float []) null);
case DataBuffer.TYPE_DOUBLE: return evaluate(point, (double[]) null);
default: throw new CannotEvaluateException();
}
}
/**
* Returns a sequence of byte values for a given location (world coordinates).
*
* @param coord World coordinates of the location to evaluate.
* @param dest An array in which to store values, or {@code null}.
* @return An array containing values.
* @throws CannotEvaluateException if the values can't be computed at the specified coordinate.
* More specifically, {@link PointOutsideCoverageException} is thrown if the evaluation
* failed because the input point has invalid coordinates.
*/
@Override
public byte[] evaluate(final DirectPosition coord, byte[] dest)
throws CannotEvaluateException
{
final int[] array = evaluate(coord, (int[]) null);
if (dest == null) {
dest = new byte[array.length];
}
for (int i=0; i<array.length; i++) {
dest[i] = (byte) array[i];
}
return dest;
}
/**
* Returns a sequence of inteeger values for a given location (world coordinates).
*
* @param coord World coordinates of the location to evaluate.
* @param dest An array in which to store values, or {@code null}.
* @return An array containing values.
* @throws CannotEvaluateException if the values can't be computed at the specified coordinate.
* More specifically, {@link PointOutsideCoverageException} is thrown if the evaluation
* failed because the input point has invalid coordinates.
*/
@Override
public int[] evaluate(final DirectPosition coord, final int[] dest)
throws CannotEvaluateException
{
return evaluate(gridGeometry.toPoint2D(coord), dest);
}
/**
* Returns a sequence of float values for a given location (world coordinates).
*
* @param coord World coordinates of the location to evaluate.
* @param dest An array in which to store values, or {@code null}.
* @return An array containing values.
* @throws CannotEvaluateException if the values can't be computed at the specified coordinate.
* More specifically, {@link PointOutsideCoverageException} is thrown if the evaluation
* failed because the input point has invalid coordinates.
*/
@Override
public float[] evaluate(final DirectPosition coord, final float[] dest)
throws CannotEvaluateException
{
return evaluate(gridGeometry.toPoint2D(coord), dest);
}
/**
* Returns a sequence of double values for a given location (world coordinates).
*
* @param coord World coordinates of the location to evaluate.
* @param dest An array in which to store values, or {@code null}.
* @return An array containing values.
* @throws CannotEvaluateException if the values can't be computed at the specified coordinate.
* More specifically, {@link PointOutsideCoverageException} is thrown if the evaluation
* failed because the input point has invalid coordinates.
*/
@Override
public double[] evaluate(final DirectPosition coord, final double[] dest)
throws CannotEvaluateException
{
return evaluate(gridGeometry.toPoint2D(coord), dest);
}
/**
* Returns a sequence of integer values for a given location (world coordinates).
*
* @param coord World coordinates of the location to evaluate.
* @param dest An array in which to store values, or {@code null}.
* @return An array containing values.
* @throws CannotEvaluateException if the values can't be computed at the specified coordinate.
* More specifically, {@link PointOutsideCoverageException} is thrown if the evaluation
* failed because the input point has invalid coordinates.
*/
public int[] evaluate(final Point2D coord, final int[] dest)
throws CannotEvaluateException
{
final Point2D pixel = gridGeometry.inverseTransform(coord);
final double fx = pixel.getX();
final double fy = pixel.getY();
if (!Double.isNaN(fx) && !Double.isNaN(fy)) {
final int x = (int)Math.round(fx);
final int y = (int)Math.round(fy);
if (image.getBounds().contains(x,y)) { // getBounds() returns a cached instance.
return image.getTile(image.XToTileX(x), image.YToTileY(y)).getPixel(x, y, dest);
}
}
throw new PointOutsideCoverageException(formatEvaluateError(coord, true));
}
/**
* Returns a sequence of float values for a given location (world coordinates).
*
* @param coord World coordinates of the location to evaluate.
* @param dest An array in which to store values, or {@code null}.
* @return An array containing values.
* @throws CannotEvaluateException if the values can't be computed at the specified coordinate.
* More specifically, {@link PointOutsideCoverageException} is thrown if the evaluation
* failed because the input point has invalid coordinates.
*/
public float[] evaluate(final Point2D coord, final float[] dest)
throws CannotEvaluateException
{
final Point2D pixel = gridGeometry.inverseTransform(coord);
final double fx = pixel.getX();
final double fy = pixel.getY();
if (!Double.isNaN(fx) && !Double.isNaN(fy)) {
final int x = (int)Math.round(fx);
final int y = (int)Math.round(fy);
if (image.getBounds().contains(x,y)) { // getBounds() returns a cached instance.
return image.getTile(image.XToTileX(x), image.YToTileY(y)).getPixel(x, y, dest);
}
}
throw new PointOutsideCoverageException(formatEvaluateError(coord, true));
}
/**
* Returns a sequence of double values for a given location (world coordinates).
*
* @param coord World coordinates of the location to evaluate.
* @param dest An array in which to store values, or {@code null}.
* @return An array containing values.
* @throws CannotEvaluateException if the values can't be computed at the specified coordinate.
* More specifically, {@link PointOutsideCoverageException} is thrown if the evaluation
* failed because the input point has invalid coordinates.
*/
public double[] evaluate(final Point2D coord, final double[] dest)
throws CannotEvaluateException
{
final Point2D pixel = gridGeometry.inverseTransform(coord);
final double fx = pixel.getX();
final double fy = pixel.getY();
if (!Double.isNaN(fx) && !Double.isNaN(fy)) {
final int x = (int)Math.round(fx);
final int y = (int)Math.round(fy);
if (image.getBounds().contains(x,y)) { // getBounds() returns a cached instance.
return image.getTile(image.XToTileX(x), image.YToTileY(y)).getPixel(x, y, dest);
}
}
throw new PointOutsideCoverageException(formatEvaluateError(coord, true));
}
/**
* Return sample dimension (band) values as an array of integers for the given
* <b>grid</b> location. The range of valid grid coordinates can be retrieved as
* in this example:
* <pre><code>
* GridEnvelope2D gridBounds = coverage.getGridGeometry2D().getGridRange();
* </code></pre>
* @param coord grid (ie. pixel) coordinates
* @param dest an optionally pre-allocated array; if non-null, its length should be
* equal to the number of bands (sample dimensions)
*
* @return band values for the given grid (pixel) location
*
* @throws PointOutsideCoverageException if the supplied coords are outside the
* grid bounds
*/
public int[] evaluate(final GridCoordinates2D coord, final int[] dest) {
if (image.getBounds().contains(coord.x, coord.y)) {
return image.getTile(image.XToTileX(coord.x), image.YToTileY(coord.y)).getPixel(coord.x, coord.y, dest);
}
throw new PointOutsideCoverageException(formatEvaluateError(coord, true));
}
/**
* Return sample dimension (band) values as an array of floats for the given
* <b>grid</b> location. The range of valid grid coordinates can be retrieved as
* in this example:
* <pre><code>
* GridEnvelope2D gridBounds = coverage.getGridGeometry2D().getGridRange();
* </code></pre>
* @param coord grid (ie. pixel) coordinates
* @param dest an optionally pre-allocated array; if non-null, its length should be
* equal to the number of bands (sample dimensions)
*
* @return band values for the given grid (pixel) location
*
* @throws PointOutsideCoverageException if the supplied coords are outside the
* grid bounds
*/
public float[] evaluate(final GridCoordinates2D coord, final float[] dest) {
if (image.getBounds().contains(coord.x, coord.y)) {
return image.getTile(image.XToTileX(coord.x), image.YToTileY(coord.y)).getPixel(coord.x, coord.y, dest);
}
throw new PointOutsideCoverageException(formatEvaluateError(coord, true));
}
/**
* Return sample dimension (band) values as an array of doubles for the given
* <b>grid</b> location. The range of valid grid coordinates can be retrieved as
* in this example:
* <pre><code>
* GridEnvelope2D gridBounds = coverage.getGridGeometry2D().getGridRange();
* </code></pre>
* @param coord grid (ie. pixel) coordinates
* @param dest an optionally pre-allocated array; if non-null, its length should be
* equal to the number of bands (sample dimensions)
*
* @return band values for the given grid (pixel) location
*
* @throws PointOutsideCoverageException if the supplied coords are outside the
* grid bounds
*/
public double[] evaluate(final GridCoordinates2D coord, final double[] dest) {
if (image.getBounds().contains(coord.x, coord.y)) {
return image.getTile(image.XToTileX(coord.x), image.YToTileY(coord.y)).getPixel(coord.x, coord.y, dest);
}
throw new PointOutsideCoverageException(formatEvaluateError(coord, true));
}
/**
* Returns a debug string for the specified coordinate. This method produces a
* string with pixel coordinates and pixel values for all bands (with geophysics
* values or category name in parenthesis). Example for a 1-banded image:
*
* <blockquote><pre>(1171,1566)=[196 (29.6 °C)]</pre></blockquote>
*
* @param coord The coordinate point where to evaluate.
* @return A string with pixel coordinates and pixel values at the specified location,
* or {@code null} if {@code coord} is outside coverage.
*/
public synchronized String getDebugString(final DirectPosition coord) {
Point2D pixel = gridGeometry.toPoint2D(coord);
pixel = gridGeometry.inverseTransform(pixel);
final int x = (int)Math.round(pixel.getX());
final int y = (int)Math.round(pixel.getY());
if (image.getBounds().contains(x,y)) { // getBounds() returns a cached instance.
final int numBands = image.getNumBands();
final Raster raster = image.getTile(image.XToTileX(x), image.YToTileY(y));
final int datatype = image.getSampleModel().getDataType();
final StringBuilder buffer = new StringBuilder();
buffer.append('(').append(x).append(',').append(y).append(")=[");
for (int band=0; band<numBands; band++) {
if (band != 0) {
buffer.append(";\u00A0");
}
final double sample = raster.getSampleDouble(x, y, band);
switch (datatype) {
case DataBuffer.TYPE_DOUBLE: buffer.append( sample); break;
case DataBuffer.TYPE_FLOAT : buffer.append((float) sample); break;
default : buffer.append( (int) sample); break;
}
final String formatted = sampleDimensions[band].getLabel(sample, null);
if (formatted != null) {
buffer.append("\u00A0(").append(formatted).append(')');
}
}
return buffer.append(']').toString();
}
return null;
}
/**
* Returns the optimal size to use for each dimension when accessing grid values.
* The default implementation returns the image's tiles size.
*/
public int[] getOptimalDataBlockSizes() {
final int[] size = new int[getDimension()];
Arrays.fill(size, 1);
size[gridGeometry.gridDimensionX] = image.getTileWidth();
size[gridGeometry.gridDimensionY] = image.getTileHeight();
return size;
}
/**
* Returns grid data as a rendered image.
*
* @return The grid data as a rendered image.
*/
public RenderedImage getRenderedImage() {
return image;
}
/**
* Returns 2D view of this grid coverage as a renderable image.
* This method allows interoperability with Java2D.
*
* @param xAxis Dimension to use for <var>x</var> axis.
* @param yAxis Dimension to use for <var>y</var> axis.
* @return A 2D view of this grid coverage as a renderable image.
*/
@Override
public RenderableImage getRenderableImage(final int xAxis, final int yAxis) {
if (xAxis == gridGeometry.axisDimensionX && yAxis == gridGeometry.axisDimensionY) {
return new Renderable();
} else {
return super.getRenderableImage(xAxis, yAxis);
}
}
/**
* {inheritDoc}
*/
@Override
public void show(String title, final int xAxis, final int yAxis) {
if (title == null || (title = title.trim()).length() == 0) {
final StringBuilder buffer = new StringBuilder(String.valueOf(getName()));
final int visibleBandIndex = CoverageUtilities.getVisibleBand(this);
final SampleDimension visibleBand = getSampleDimension(visibleBandIndex);
final Unit<?> unit = visibleBand.getUnits();
buffer.append(" - ").append(String.valueOf(visibleBand.getDescription()));
if (unit != null) {
buffer.append(" (").append(unit).append(')');
}
title = buffer.toString();
}
super.show(title, xAxis, yAxis);
}
/**
* {inheritDoc}
*/
@Override
public void show(final String title) {
show(title, gridGeometry.axisDimensionX, gridGeometry.axisDimensionY);
}
/**
* A view of a {@linkplain GridCoverage2D grid coverage} as a renderable image. Renderable images
* allow interoperability with <A HREF="http://java.sun.com/products/java-media/2D/">Java2D</A>
* for a two-dimensional slice of a grid coverage.
*
* @version $Id$
* @author Martin Desruisseaux (IRD)
*
* @see AbstractCoverage#getRenderableImage
*
* @todo Override {@link #createRendering} and use the affine transform operation.
* Also uses the JAI's "Transpose" operation is x and y axis are interchanged.
*/
protected class Renderable extends AbstractCoverage.Renderable {
/**
* For compatibility during cross-version serialization.
*/
private static final long serialVersionUID = 4544636336787905450L;
/**
* Constructs a renderable image.
*/
public Renderable() {
super(gridGeometry.axisDimensionX, gridGeometry.axisDimensionY);
}
/**
* Returns a rendered image with a default width and height in pixels.
*
* @return A rendered image containing the rendered data
*/
@Override
public RenderedImage createDefaultRendering() {
if (xAxis == gridGeometry.axisDimensionX &&
yAxis == gridGeometry.axisDimensionY)
{
return getRenderedImage();
}
return super.createDefaultRendering();
}
}
/**
* Hints that the given area may be needed in the near future. Some implementations
* may spawn a thread or threads to compute the tiles while others may ignore the hint.
*
* @param area A rectangle indicating which geographic area to prefetch.
* This area's coordinates must be expressed according the
* grid coverage's coordinate reference system, as given by
* {@link #getCoordinateReferenceSystem}.
*/
public void prefetch(final Rectangle2D area) {
final Point[] tileIndices = image.getTileIndices(gridGeometry.inverseTransform(area));
if (tileIndices != null) {
image.prefetchTiles(tileIndices);
}
}
/**
* Constructs the {@link PlanarImage} from the {@linkplain SerializableRenderedImage}
* after deserialization.
*/
private void readObject(final ObjectInputStream in) throws IOException, ClassNotFoundException {
in.defaultReadObject();
try {
/*
* Set the 'image' field using reflection, because this field is final.
* This is a legal usage for deserialization according Field.set(...)
* documentation in J2SE 1.5.
*/
final Field field = GridCoverage2D.class.getDeclaredField("image");
field.setAccessible(true);
field.set(this, PlanarImage.wrapRenderedImage(serializedImage));
} catch (NoSuchFieldException cause) {
InvalidClassException e = new InvalidClassException(cause.getLocalizedMessage());
e.initCause(cause);
throw e;
} catch (IllegalAccessException cause) {
InvalidObjectException e = new InvalidObjectException(cause.getLocalizedMessage());
e.initCause(cause);
throw e;
}
}
/**
* Serializes this grid coverage. Before serialization, a {@linkplain SerializableRenderedImage
* serializable rendered image} is created if it was not already done.
*/
private void writeObject(final ObjectOutputStream out) throws IOException {
if (serializedImage == null) {
RenderedImage source = image;
while (source instanceof RenderedImageAdapter) {
source = ((RenderedImageAdapter) source).getWrappedImage();
}
if (source instanceof SerializableRenderedImage) {
serializedImage = (SerializableRenderedImage) source;
} else {
if (tileEncoding == null) {
tileEncoding = "gzip";
}
serializedImage = new SerializableRenderedImage(source, false, null,
tileEncoding, null, null);
final LogRecord record = Loggings.format(Level.FINE,
LoggingKeys.CREATED_SERIALIZABLE_IMAGE_$2, getName(), tileEncoding);
record.setSourceClassName(GridCoverage2D.class.getName());
record.setSourceMethodName("writeObject");
record.setLoggerName(LOGGER.getName());
LOGGER.log(record);
}
}
out.defaultWriteObject();
}
/**
* Provides a hint that a coverage will no longer be accessed from a reference in user space.
* This method {@linkplain PlanarImage#dispose disposes} the {@linkplain #image} only if at
* least one of the following conditions is true (otherwise this method do nothing):
* <p>
* <ul>
* <li>{@code force} is {@code true}, <strong>or</strong></li>
* <li>The underlying {@linkplain #image} has no {@linkplain PlanarImage#getSinks sinks}.</li>
* </ul>
* <p>
* This safety check helps to prevent the disposal of an {@linkplain #image} that still
* used in a JAI operation chain. It doesn't prevent the disposal in every cases however.
* When unsure about whatever a coverage is still in use or not, it is safer to not invoke
* this method and rely on the garbage collector instead.
*
* @see PlanarImage#dispose
*
* @since 2.4
*/
@Override
public synchronized boolean dispose(final boolean force) {
if (!disposeImage(force)) {
return false;
}
return super.dispose(force);
}
/**
* Disposes only the {@linkplain #image}, not the views. This method is invoked by
* {@link ViewsManager#dispose}. This method checks the set of every sinks,
* which may or may not be {@link RenderedImage}s. If there is no sinks, we can process.
*/
final synchronized boolean disposeImage(final boolean force) {
if (!force) {
Collection<?> sinks = image.getSinks();
if (sinks != null && !sinks.isEmpty()) {
return false;
}
}
image.dispose();
return true;
}
/**
* Returns a string representation of this grid coverage.
* This is mostly for debugging purpose and may change in any future version.
*/
@Override
public String toString() {
final StringBuilder buffer = new StringBuilder(super.toString());
final String lineSeparator = System.getProperty("line.separator", "\n");
buffer.append("\u2514 Image=").append(Classes.getShortClassName(image)).append('[');
if (image instanceof OperationNode) {
buffer.append('"').append(((OperationNode) image).getOperationName()).append('"');
}
buffer.append(']');
return buffer.append(lineSeparator).toString();
}
}