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package org.zwobble.mammoth.internal.docx;
import java.io.IOException;
import java.io.InputStream;
import java.net.URI;
import java.net.URISyntaxException;
import java.nio.file.Path;
import java.util.Optional;
public class PathRelativeFileReader implements FileReader {
public static FileReader relativeTo(Optional<Path> path) {
return new PathRelativeFileReader(path);
}
private final Optional<Path> path;
private PathRelativeFileReader(Optional<Path> path) {
this.path = path;
}
@Override
public InputStream getInputStream(String uri) throws IOException {
try {
Optional<URI> absoluteUri = asAbsoluteUri(uri);
if (absoluteUri.isPresent()) {
return open(absoluteUri.get());
} else if (path.isPresent()) {
return open(path.get().toUri().resolve(uri));
} else {
throw new IOException("path of document is unknown, but is required for relative URI");
}
} catch (IOException exception) {
throw new IOException("could not open external image '" + uri + "': " + exception.getMessage());
}
}
private static InputStream open(URI uri) throws IOException {
return uri.toURL().openStream();
}
private static Optional<URI> asAbsoluteUri(String uriString) {
try {
URI uri = new URI(uriString);
return uri.isAbsolute() ? Optional.of(uri) : Optional.empty();
} catch (URISyntaxException exception) {
return Optional.empty();
}
}
}
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