org.libreoffice.ci.gerrit.buildbot.servlets.RenderType.java Source code

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Here is the source code for org.libreoffice.ci.gerrit.buildbot.servlets.RenderType.java

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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 org.libreoffice.ci.gerrit.buildbot.servlets;

import com.google.common.base.Strings;
import com.google.common.net.HttpHeaders;

import javax.servlet.http.HttpServletRequest;

/** Type of formatting to use in the response to the client. */
public enum RenderType {
    HTML("text/html"), TEXT("text/plain"), JSON("application/json"), DEFAULT("*/*");

    private static final String FORMAT_TYPE_ATTRIBUTE = RenderType.class.getName();

    public static RenderType getFormatType(HttpServletRequest req) {
        RenderType result = (RenderType) req.getAttribute(FORMAT_TYPE_ATTRIBUTE);
        if (result != null) {
            return result;
        }

        String format = req.getParameter("format");
        if (format != null) {
            for (RenderType type : RenderType.values()) {
                if (format.equalsIgnoreCase(type.name())) {
                    return set(req, type);
                }
            }
            throw new IllegalArgumentException("Invalid format " + format);
        }

        String accept = req.getHeader(HttpHeaders.ACCEPT);
        if (Strings.isNullOrEmpty(accept)) {
            return set(req, DEFAULT);
        }

        for (String p : accept.split("[ ,;][ ,;]*")) {
            for (RenderType type : RenderType.values()) {
                if (p.equals(type.mimeType)) {
                    return set(req, type != HTML ? type : DEFAULT);
                }
            }
        }
        return set(req, DEFAULT);
    }

    private static RenderType set(HttpServletRequest req, RenderType format) {
        req.setAttribute(FORMAT_TYPE_ATTRIBUTE, format);
        return format;
    }

    private final String mimeType;

    private RenderType(String mimeType) {
        this.mimeType = mimeType;
    }

    public String getMimeType() {
        return mimeType;
    }
}