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MimeTypes.java
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MimeTypes.java
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package com.vtence.molecule.http;
import java.util.HashMap;
import java.util.Map;
import java.util.function.Predicate;
public final class MimeTypes {
public static final String HTML = "text/html";
public static final String TEXT = "text/plain";
public static final String CSS = "text/css";
public static final String JAVASCRIPT = "application/javascript";
public static final String JSON = "application/json";
public static final String PNG = "image/png";
public static final String GIF = "image/gif";
public static final String JPEG = "image/jpeg";
public static final String ICON = "image/x-icon";
public static final String BINARY_DATA = "application/octet-stream";
private final Map<String, String> knownTypes = new HashMap<>();
public static MimeTypes defaults() {
MimeTypes mimeTypes = new MimeTypes();
mimeTypes.register("txt", TEXT);
mimeTypes.register("html", HTML);
mimeTypes.register("css", CSS);
mimeTypes.register("js", JAVASCRIPT);
mimeTypes.register("png", PNG);
mimeTypes.register("gif", GIF);
mimeTypes.register("jpg", JPEG);
mimeTypes.register("jpeg", JPEG);
mimeTypes.register("ico", ICON);
return mimeTypes;
}
public static boolean matches(String mediaType, String pattern) {
return isSpecializationOf(pattern).test(mediaType);
}
public static Predicate<String> isSpecializationOf(String pattern) {
var type = MediaType.parse(pattern);
return m -> type.isGeneralizationOf(MediaType.parse(m));
}
public void register(String extension, String mimeType) {
knownTypes.put(extension, mimeType);
}
public String guessFrom(String filename) {
for (String ext : knownTypes.keySet()) {
if (filename.endsWith("." + ext)) return knownTypes.get(ext);
}
return BINARY_DATA;
}
private static class MediaType {
public static final String WILDCARD = "*";
public final String type;
public final String subtype;
public MediaType(String type, String subtype) {
this.type = type;
this.subtype = subtype;
}
public static MediaType parse(String mediaType) {
String[] parts = mediaType.split("/");
return parts.length > 1 ? new MediaType(parts[0], parts[1]) : new MediaType(parts[0], WILDCARD);
}
public boolean isGeneralizationOf(MediaType mime) {
return (type.equals(mime.type) || type.equals(WILDCARD)) &&
(subtype.equals(WILDCARD) || subtype.equals(mime.subtype));
}
}
}