package org.springframework.core.codec;
import java.util.Map;
import reactor.core.publisher.Flux;
import org.springframework.core.ResolvableType;
import org.springframework.core.io.Resource;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.core.io.buffer.DataBufferFactory;
import org.springframework.core.io.buffer.DataBufferUtils;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
import org.springframework.util.MimeType;
import org.springframework.util.MimeTypeUtils;
import org.springframework.util.StreamUtils;
public class ResourceEncoder extends AbstractSingleValueEncoder<Resource> {
public static final int DEFAULT_BUFFER_SIZE = StreamUtils.BUFFER_SIZE;
private final int bufferSize;
public ResourceEncoder() {
this(DEFAULT_BUFFER_SIZE);
}
public ResourceEncoder(int bufferSize) {
super(MimeTypeUtils.APPLICATION_OCTET_STREAM, MimeTypeUtils.ALL);
Assert.isTrue(bufferSize > 0, "'bufferSize' must be larger than 0");
this.bufferSize = bufferSize;
}
@Override
public boolean canEncode(ResolvableType elementType, @Nullable MimeType mimeType) {
Class<?> clazz = elementType.toClass();
return (super.canEncode(elementType, mimeType) && Resource.class.isAssignableFrom(clazz));
}
@Override
protected Flux<DataBuffer> encode(Resource resource, DataBufferFactory bufferFactory,
ResolvableType type, @Nullable MimeType mimeType, @Nullable Map<String, Object> hints) {
if (logger.isDebugEnabled() && !Hints.isLoggingSuppressed(hints)) {
String logPrefix = Hints.getLogPrefix(hints);
logger.debug(logPrefix + "Writing [" + resource + "]");
}
return DataBufferUtils.read(resource, bufferFactory, this.bufferSize);
}
}