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// Copyright 2012 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package com.google.gitiles;
import com.google.common.base.Enums;
import com.google.common.base.Strings;
import com.google.common.net.HttpHeaders;
import java.util.Optional;
import javax.servlet.http.HttpServletRequest;
/** Type of formatting to use in the response to the client. */
public enum FormatType {
HTML("text/html"),
TEXT("text/plain"),
JSON("application/json"),
DEFAULT("*/*");
private static final String FORMAT_TYPE_ATTRIBUTE = FormatType.class.getName();
public static Optional<FormatType> getFormatType(HttpServletRequest req) {
@SuppressWarnings("unchecked")
Optional<FormatType> result = (Optional<FormatType>) req.getAttribute(FORMAT_TYPE_ATTRIBUTE);
if (result != null) {
return result;
}
String fmt = req.getParameter("format");
if (!Strings.isNullOrEmpty(fmt)) {
FormatType f = Enums.getIfPresent(FormatType.class, fmt.toUpperCase()).orNull();
return set(req, Optional.ofNullable(f));
}
String accept = req.getHeader(HttpHeaders.ACCEPT);
if (Strings.isNullOrEmpty(accept)) {
return set(req, Optional.of(DEFAULT));
}
for (String p : accept.split("[ ,;][ ,;]*")) {
for (FormatType type : FormatType.values()) {
if (p.equals(type.mimeType)) {
return set(req, Optional.of(type != HTML ? type : DEFAULT));
}
}
}
return set(req, Optional.of(DEFAULT));
}
private static Optional<FormatType> set(HttpServletRequest req, Optional<FormatType> format) {
req.setAttribute(FORMAT_TYPE_ATTRIBUTE, format);
return format;
}
private final String mimeType;
FormatType(String mimeType) {
this.mimeType = mimeType;
}
public String getMimeType() {
return mimeType;
}
}