/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.isis.core.metamodel.facets.value.image;
import java.awt.Image;
import java.awt.image.ColorModel;
import java.awt.image.ImageObserver;
import java.awt.image.MemoryImageSource;
import java.awt.image.PixelGrabber;
import org.apache.isis.applib.adapters.Parser;
import org.apache.isis.core.commons.exceptions.IsisException;
import org.apache.isis.core.commons.exceptions.UnexpectedCallException;
import org.apache.isis.core.metamodel.adapter.ObjectAdapter;
import org.apache.isis.core.metamodel.facetapi.Facet;
import org.apache.isis.core.metamodel.facetapi.FacetHolder;
import org.apache.isis.core.metamodel.facets.object.value.vsp.ValueSemanticsProviderAndFacetAbstract;
import org.apache.isis.core.metamodel.services.ServicesInjector;
public abstract class ImageValueSemanticsProviderAbstract<T> extends ValueSemanticsProviderAndFacetAbstract<T> implements ImageValueFacet {
private static final int TYPICAL_LENGTH = 18;
private static final Object DEFAULT_VALUE = null; // no default
private static final char[] BASE_64_CHARS = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x',
'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/', };
protected static final byte[] REVERSE_BASE_64_CHARS = new byte[0x100];
static {
for (int i = 0; i < REVERSE_BASE_64_CHARS.length; i++) {
REVERSE_BASE_64_CHARS[i] = -1;
}
for (byte i = 0; i < BASE_64_CHARS.length; i++) {
REVERSE_BASE_64_CHARS[BASE_64_CHARS[i]] = i;
}
}
private FacetHolder facetHolder;
@SuppressWarnings("unchecked")
public ImageValueSemanticsProviderAbstract(final FacetHolder holder, final Class<T> adaptedClass, final ServicesInjector context) {
super(ImageValueFacet.class, holder, adaptedClass, TYPICAL_LENGTH, null, Immutability.NOT_IMMUTABLE, EqualByContent.NOT_HONOURED, (T) DEFAULT_VALUE, context);
}
/**
* Returns null to indicate that this value does not parse entry strings
*/
@Override
public Parser<T> getParser() {
return null;
}
@Override
protected T doParse(final Object original, final String entry) {
throw new UnexpectedCallException();
}
public byte[] getAsByteArray(final ObjectAdapter object) {
final int[] flatIntArray = flatten(object);
final byte[] byteArray = new byte[flatIntArray.length * 4];
for (int i = 0; i < flatIntArray.length; i++) {
final int value = flatIntArray[i];
byteArray[i * 4] = (byte) ((value >> 24) & 0xff);
byteArray[i * 4 + 1] = (byte) ((value >> 16) & 0xff);
byteArray[i * 4 + 2] = (byte) ((value >> 8) & 0xff);
byteArray[i * 4 + 3] = (byte) (value & 0xff);
}
return byteArray;
}
private static int byteArrayToInt(final byte[] byteArray, final int offset) {
int value = 0;
for (int i = 0; i < 4; i++) {
final int shift = (4 - 1 - i) * 8;
value += (byteArray[i + offset] & 0x000000FF) << shift;
}
return value;
}
@Override
public boolean alwaysReplace() {
return false;
}
@Override
public Facet getUnderlyingFacet() {
return null;
}
/**
* Not required because {@link #alwaysReplace()} is <tt>false</tt>.
*/
@Override
public void setUnderlyingFacet(final Facet underlyingFacet) {
throw new UnsupportedOperationException();
}
@Override
public boolean isDerived() {
return false;
}
public T restoreFromByteArray(final byte[] byteArray) {
final int[] flatIntArray = new int[byteArray.length / 4];
for (int i = 0; i < flatIntArray.length; i++) {
flatIntArray[i] = byteArrayToInt(byteArray, i * 4);
}
return setPixels(inflate(flatIntArray));
}
private int[] flatten(final ObjectAdapter object) {
final int[][] image = getPixels(object);
final int[] flatArray = new int[(getHeight(object) * getWidth(object)) + 2];
int flatIndex = 0;
flatArray[flatIndex++] = getHeight(object);
flatArray[flatIndex++] = getWidth(object);
for (int i = 0; i < getHeight(object); i++) {
for (int j = 0; j < getWidth(object); j++) {
flatArray[flatIndex++] = image[i][j];
}
}
return flatArray;
}
private static int[][] inflate(final int[] flatIntArray) {
int flatIndex = 0;
final int height = flatIntArray[flatIndex++];
final int width = flatIntArray[flatIndex++];
final int[][] newImage = new int[height][width];
for (int i = 0; i < height; i++) {
for (int j = 0; j < width; j++) {
newImage[i][j] = flatIntArray[flatIndex++];
}
}
return newImage;
}
@Override
protected String doEncode(final Object object) {
final int[][] image = getPixels(object);
final int lines = image.length;
final int width = image[0].length;
final StringBuffer encodeData = new StringBuffer(lines * width * 4);
encodePixel(lines, encodeData);
encodePixel(width, encodeData);
for (int line = 0; line < lines; line++) {
for (int pixel = 0; pixel < width; pixel++) {
encodePixel(image[line][pixel], encodeData);
}
}
return encodeData.toString();
}
protected Image createImage(final int[][] pixels) {
final int lines = pixels.length;
final int width = pixels[0].length;
final int[] pix = new int[lines * width];
int offset = 0;
for (int line = 0; line < lines; line++) {
System.arraycopy(pixels[line], 0, pix, offset, width);
offset += width;
}
final MemoryImageSource source = new MemoryImageSource(width, lines, pix, 0, width);
return java.awt.Toolkit.getDefaultToolkit().createImage(source);
}
private int decodePixel(final String data, final int item) {
final int offset = item * 4;
int pixel = 0;
for (int i = 0; i < 4; i++) {
final char c = data.charAt(offset + i);
final byte b = REVERSE_BASE_64_CHARS[c];
if (i == 0 && b >= 32) {
pixel = 0xff;
}
pixel = (pixel << 6) + b;
}
return pixel;
}
private void encodePixel(final int pixel, final StringBuffer encodeData) {
// TODO the encoding is poor as the negative numbers are not dealt with
// properly because the 6 MSBs
// are not included.
if (pixel > 0x7FFFFF || pixel < -0x7FFFFF) {
// throw new IsisException("" + pixel);
}
for (int i = 3; i >= 0; i--) {
final int bitsToShift = i * 6;
final int c = pixel >> bitsToShift;
final char cc = BASE_64_CHARS[c & 0x3F];
encodeData.append(cc);
}
}
public String getIconName() {
return null;
}
protected abstract int[][] getPixels(Object object);
protected int[][] grabPixels(final Image image) {
final int width = image.getWidth(null);
final int lines = image.getHeight(null);
final int pixels[] = new int[width * lines];
final PixelGrabber grabber = new PixelGrabber(image, 0, 0, width, lines, pixels, 0, width);
grabber.setColorModel(ColorModel.getRGBdefault());
try {
if (grabber.grabPixels() && (grabber.status() & ImageObserver.ALLBITS) != 0) {
final int[][] array = new int[lines][width];
int srcPos = 0;
for (int line = 0; line < lines; line++) {
array[line] = new int[width];
System.arraycopy(pixels, srcPos, array[line], 0, width);
for (int pixel = 0; pixel < array[line].length; pixel++) {
array[line][pixel] = array[line][pixel] | 0xFF000000;
}
srcPos += width;
}
return array;
}
// TODO what happens if the grab fails?
return new int[lines][width];
} catch (final InterruptedException e) {
throw new IsisException(e);
}
}
@Override
public T doRestore(final String data) {
final int lines = decodePixel(data, 0);
final int width = decodePixel(data, 1);
final int[][] imageData = new int[lines][width];
int offset = 2;
for (int line = 0; line < lines; line++) {
for (int pixel = 0; pixel < width; pixel++) {
imageData[line][pixel] = decodePixel(data, offset++);
imageData[line][pixel] = imageData[line][pixel] | 0xFF000000;
}
}
final T image = setPixels(imageData);
return image;
}
protected abstract T setPixels(int[][] pixels);
public void setMask(final String mask) {
}
@Override
public String titleString(final Object value) {
return "image";
}
@Override
public String titleStringWithMask(final Object value, final String usingMask) {
return "image";
}
@Override
public FacetHolder getFacetHolder() {
return facetHolder;
}
@Override
public void setFacetHolder(final FacetHolder facetHolder) {
this.facetHolder = facetHolder;
}
// /////// toString ///////
@Override
public String toString() {
return "ImageValueSemanticsProvider";
}
}