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Java library for reading and writing FITS files. FITS, the Flexible Image Transport System, is the format commonly used in the archiving and transport of astronomical data.
/*
* #%L
* nom.tam FITS library
* %%
* Copyright (C) 1996 - 2024 nom-tam-fits
* %%
* This is free and unencumbered software released into the public domain.
*
* Anyone is free to copy, modify, publish, use, compile, sell, or
* distribute this software, either in source code form or as a compiled
* binary, for any purpose, commercial or non-commercial, and by any
* means.
*
* In jurisdictions that recognize copyright laws, the author or authors
* of this software dedicate any and all copyright interest in the
* software to the public domain. We make this dedication for the benefit
* of the public at large and to the detriment of our heirs and
* successors. We intend this dedication to be an overt act of
* relinquishment in perpetuity of all present and future rights to this
* software under copyright law.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
* #L%
*/
package nom.tam.util.array;
import java.lang.reflect.Array;
/**
* Make deep copies of multi-dimensional arrays.
*
* @param The generic type of array from which we want to copy elements
* @param The generic type of array to which we want to copy elements.
*/
@SuppressWarnings("deprecation")
public final class MultiArrayCopier {
/**
* Copies the contents of one array into another. The two arrays should match in shape and size, but may be of
* different types. Casting will be used to convert between types if necessary (e.g. double[][] to
* int[][]). .
*
* @param The generic type of array from which we want to copy elements
* @param The generic type of array to which we want to copy elements.
* @param fromArray the source array, whose data is to be copied
* @param toArray the destination array, into which data is copied
*/
public static void copyInto(Source fromArray, Destination toArray) {
new MultiArrayCopier<>(fromArray, toArray).copyInto();
}
private final MultiArrayIterator from;
private final MultiArrayIterator to;
private Destination currentToArray;
private int currentToArrayOffset;
private int currentToArrayLength;
private final MultiArrayCopyFactory copyFactory;
@SuppressWarnings("unchecked")
private MultiArrayCopier(Source fromArray, Destination toArray) {
from = new MultiArrayIterator<>(fromArray);
to = new MultiArrayIterator<>(toArray);
copyFactory = (MultiArrayCopyFactory) MultiArrayCopyFactory.select(from.deepComponentType(),
to.deepComponentType());
}
private void copyInto() {
Source current = from.next();
while (current != null) {
copyInto(current);
current = from.next();
}
}
private void copyInto(Source currentFromArray) {
int currentFromArrayOffset = 0;
int currentFromArrayLength = Array.getLength(currentFromArray);
while (currentFromArrayOffset < currentFromArrayLength) {
if (currentToArray == null || currentToArrayOffset >= currentToArrayLength) {
currentToArray = to.next();
currentToArrayOffset = 0;
currentToArrayLength = Array.getLength(currentToArray);
}
int length = Math.min(currentToArrayLength - currentToArrayOffset,
currentFromArrayLength - currentFromArrayOffset);
copyFactory.arraycopy(currentFromArray, currentFromArrayOffset, currentToArray, currentToArrayOffset, length);
currentFromArrayOffset += length;
currentToArrayOffset += length;
}
}
}
