java/net/DefaultFileNameMap.java

/*
 * Copyright (C) 2010 The Android Open Source Project
 *
 * 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 java.net;

import libcore.content.type.MimeMap;

/**
 * Implements {@link FileNameMap} in terms of {@link MimeMap}.
 */
class DefaultFileNameMap implements FileNameMap {

    public String getContentTypeFor(String filename) {
        int fragmentIndex = filename.indexOf('#');
        if (fragmentIndex >= 0) {
            filename = filename.substring(0, fragmentIndex);
        }
        if (filename.endsWith("/")) { // a directory
            return "text/html";
        }

        int slashIndex = filename.lastIndexOf('/');
        if (slashIndex >= 0) {
            filename = filename.substring(slashIndex);
        }

        MimeMap mimeMap = MimeMap.getDefault();
        int dotIndex = -1;
        do {
            String ext = filename.substring(dotIndex + 1);
            String result = mimeMap.guessMimeTypeFromExtension(ext);
            if ((result != null) &&
                    // Compat behavior: If there's a '/', then extension must not be the
                    // whole string. http://b/144977800
                    (slashIndex < 0 || dotIndex >= 0)) {
                return result;
            }
            dotIndex = filename.indexOf('.', dotIndex + 1);
        } while (dotIndex >= 0);
        return null;
    }
}