package org.springframework.core.codec;
import java.io.ByteArrayInputStream;
import java.util.Map;
import org.reactivestreams.Publisher;
import reactor.core.publisher.Flux;
import org.springframework.core.ResolvableType;
import org.springframework.core.io.ByteArrayResource;
import org.springframework.core.io.InputStreamResource;
import org.springframework.core.io.Resource;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.core.io.buffer.DataBufferUtils;
import org.springframework.lang.Nullable;
import org.springframework.util.MimeType;
import org.springframework.util.MimeTypeUtils;
public class ResourceDecoder extends AbstractDataBufferDecoder<Resource> {
public static String FILENAME_HINT = ResourceDecoder.class.getName() + ".filename";
public ResourceDecoder() {
super(MimeTypeUtils.ALL);
}
@Override
public boolean canDecode(ResolvableType elementType, @Nullable MimeType mimeType) {
return (Resource.class.isAssignableFrom(elementType.toClass()) &&
super.canDecode(elementType, mimeType));
}
@Override
public Flux<Resource> decode(Publisher<DataBuffer> inputStream, ResolvableType elementType,
@Nullable MimeType mimeType, @Nullable Map<String, Object> hints) {
return Flux.from(decodeToMono(inputStream, elementType, mimeType, hints));
}
@Override
public Resource decode(DataBuffer dataBuffer, ResolvableType elementType,
@Nullable MimeType mimeType, @Nullable Map<String, Object> hints) {
byte[] bytes = new byte[dataBuffer.readableByteCount()];
dataBuffer.read(bytes);
DataBufferUtils.release(dataBuffer);
if (logger.isDebugEnabled()) {
logger.debug(Hints.getLogPrefix(hints) + "Read " + bytes.length + " bytes");
}
Class<?> clazz = elementType.toClass();
String filename = hints != null ? (String) hints.get(FILENAME_HINT) : null;
if (clazz == InputStreamResource.class) {
return new InputStreamResource(new ByteArrayInputStream(bytes)) {
@Override
public String getFilename() {
return filename;
}
@Override
public long contentLength() {
return bytes.length;
}
};
}
else if (Resource.class.isAssignableFrom(clazz)) {
return new ByteArrayResource(bytes) {
@Override
public String getFilename() {
return filename;
}
};
}
else {
throw new IllegalStateException("Unsupported resource class: " + clazz);
}
}
}