io.vertx.up.unity.Upload Maven / Gradle / Ivy
package io.vertx.up.unity;
import io.vertx.core.buffer.Buffer;
import io.vertx.ext.web.FileUpload;
import io.vertx.up.log.Annal;
import io.vertx.up.runtime.ZeroSerializer;
import java.io.File;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.function.Function;
import java.util.stream.Collectors;
import java.util.stream.Stream;
/**
* 「T」Zero Tools
* This tools is for file upload serialization such as
*
* 1. StreamParam
* 2. FormParam
*
* It's critical tool to convert `io.vertx.ext.web.FileUpload` to different types
*
* 1. `java.io.File` reference
* 2. `io.vertx.ext.web.FileUpload` reference
* 3. `java.lang.byte[]` File Content
* 4. `io.vertx.core.buffer` File Content
*/
@SuppressWarnings("all")
class Upload {
private static final Annal LOGGER = Annal.get(Upload.class);
static T toFile(final Set fileUploads, final Class expected, final Function consumer) {
/*
* Size = 0
* Size = 1
* Size > 1
*/
if (Objects.isNull(fileUploads) || fileUploads.isEmpty()) {
/*
* Size = 0 or null
*/
LOGGER.warn("The fileUploads set size is 0.");
if (Collection.class.isAssignableFrom(expected)) {
if (List.class.isAssignableFrom(expected)) {
/*
* List
*/
return (T) Collections.emptyList();
} else if (Set.class.isAssignableFrom(expected)) {
/*
* Set
*/
return (T) Collections.emptySet();
} else {
LOGGER.warn("The type {0} is not supported.", expected.getName());
return null;
}
} else {
return null;
}
} else {
/*
* Collection checking
* 1. List
* 2. Set
*/
if (Collection.class.isAssignableFrom(expected)) {
/*
* For collection, because of generic type declare and Java Reflection limitation
* It could support `FileUpload` type only, it is the source of file upload and
* it could be used in different business requirement.
*
* It means that list only support Set and List
*/
final Stream stream = fileUploads.stream()
.map(fileUpload -> toFile(fileUpload, FileUpload.class, consumer));
if (List.class.isAssignableFrom(expected)) {
/*
* List
*/
return (T) stream.collect(Collectors.toList());
} else if (Set.class.isAssignableFrom(expected)) {
/*
* Set
*/
return (T) stream.collect(Collectors.toSet());
} else {
LOGGER.warn("The type {0} is not supported.", expected.getName());
return null;
}
} else {
/*
* Size > 1 ( Because declared type is not collection )
*/
if (!isByteArray(expected) && expected.isArray()) {
/*
* expected != byte[]/Byte[]
*/
if (expected.isArray()) {
/*
* expected == T[]
*/
final Class componentCls = expected.getComponentType();
final List fileList = new ArrayList<>(fileUploads);
if (File.class == componentCls) {
/*
* File[]
*/
final File[] files = new File[fileList.size()];
for (int idx = 0; idx < fileList.size(); idx++) {
files[idx] = toFile(fileList.get(idx), File.class, consumer);
}
return (T) files;
} else if (FileUpload.class.isAssignableFrom(componentCls)) {
/*
* FileUpload[]
*/
final FileUpload[] files = new FileUpload[fileList.size()];
for (int idx = 0; idx < fileList.size(); idx++) {
files[idx] = fileList.get(idx);
}
return (T) files;
}
return (T) fileUploads.stream()
.map(item -> toFile(item, componentCls, consumer))
.toArray();
} else {
/*
* expected = Single
*/
return toFile(fileUploads, expected, consumer);
}
} else {
/*
* byte[] or single type
*/
final FileUpload fileUpload = fileUploads.iterator().next();
return toFile(fileUpload, expected, consumer);
}
}
}
}
/**
* Split `Set` by fieldname
*
* @param fileUploads FileUpload Set
*
* @return Map of `field = Set`
*/
static ConcurrentMap> toFile(final Set fileUploads) {
final ConcurrentMap> fileMap = new ConcurrentHashMap<>();
fileUploads.stream().forEach(fileUpload -> {
final String field = fileUpload.name();
/* Process */
if (!fileMap.containsKey(field)) {
final Set set = new HashSet<>();
fileMap.put(field, set);
}
final Set set = fileMap.get(field);
set.add(fileUpload);
});
return fileMap;
}
private static boolean isByteArray(final Class expected) {
if (expected.isArray()) {
final Class componentCls = expected.getComponentType();
return (byte.class == componentCls || Byte.class == componentCls);
} else return false;
}
static T toFile(final FileUpload fileUpload, final Class expected, final Function consumer) {
final String filename = fileUpload.uploadedFileName();
if (FileUpload.class.isAssignableFrom(expected)) {
/*
* FileUpload ( interface )
*/
return (T) fileUpload;
} else if (File.class == expected) {
/*
* File ( class )
*/
return (T) ZeroSerializer.getValue(expected, filename);
} else if (expected.isArray()) {
/*
* T[]
*/
final Class componentCls = expected.getComponentType();
if (isByteArray(expected)) {
final Buffer buffer = consumer.apply(filename);
final byte[] bytes = buffer.getBytes();
if (byte.class == componentCls) {
/*
* byte[]
*/
return (T) bytes;
} else {
/*
* Byte[]
*/
final Byte[] byteWrapper = new Byte[bytes.length];
for (int idx = 0; idx < bytes.length; idx++) {
byteWrapper[idx] = bytes[idx];
}
return (T) byteWrapper;
}
} else {
LOGGER.warn("The array type support byte[]/Byte[] only in current version, current = {0}",
componentCls.getName());
return null;
}
} else if (Buffer.class.isAssignableFrom(expected)) {
/*
* Buffer
*/
return (T) consumer.apply(filename);
} else {
LOGGER.warn("The expected type {0} is not supported.", expected.getName());
return null;
}
}
}
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