/**
* This will return a list of alternate color spaces(PDColorSpace) if the display application does
* not support this icc stream.
*
* @return A list of alternate color spaces.
* @throws IOException If there is an error getting the alternate color spaces.
*/
public List getAlternateColorSpaces() throws IOException {
COSBase alternate = stream.getDictionaryObject(COSName.getPDFName("Alternate"));
COSArray alternateArray = null;
if (alternate == null) {
alternateArray = new COSArray();
int numComponents = getNumberOfComponents();
String csName = null;
if (numComponents == 1) {
csName = PDDeviceGray.NAME;
} else if (numComponents == 3) {
csName = PDDeviceRGB.NAME;
} else if (numComponents == 4) {
csName = PDDeviceCMYK.NAME;
} else {
throw new IOException("Unknown colorspace number of components:" + numComponents);
}
alternateArray.add(COSName.getPDFName(csName));
} else {
if (alternate instanceof COSArray) {
alternateArray = (COSArray) alternate;
} else if (alternate instanceof COSName) {
alternateArray = new COSArray();
alternateArray.add(alternate);
} else {
throw new IOException(
"Error: expected COSArray or COSName and not " + alternate.getClass().getName());
}
}
List retval = new ArrayList();
for (int i = 0; i < alternateArray.size(); i++) {
retval.add(PDColorSpaceFactory.createColorSpace((COSName) alternateArray.get(i)));
}
return new COSArrayList(retval, alternateArray);
}
private COSArray getRangeArray(int n) {
COSArray rangeArray = (COSArray) stream.getDictionaryObject(COSName.getPDFName("Range"));
if (rangeArray == null) {
rangeArray = new COSArray();
stream.setItem(COSName.getPDFName("Range"), rangeArray);
while (rangeArray.size() < n * 2) {
rangeArray.add(new COSFloat(-100));
rangeArray.add(new COSFloat(100));
}
}
return rangeArray;
}
