NameMangler.java
- /*
- * *************************************************************************************************************************************************************
- *
- * MapView: a JavaFX map renderer for tile-based servers
- * http://tidalwave.it/projects/mapview
- *
- * Copyright (C) 2024 - 2025 by Tidalwave s.a.s. (http://tidalwave.it)
- *
- * *************************************************************************************************************************************************************
- *
- * 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.
- *
- * *************************************************************************************************************************************************************
- *
- * git clone https://bitbucket.org/tidalwave/mapview-src
- * git clone https://github.com/tidalwave-it/mapview-src
- *
- * *************************************************************************************************************************************************************
- */
- package it.tidalwave.mapviewer.impl;
- import jakarta.annotation.Nonnull;
- import lombok.experimental.UtilityClass;
- /***************************************************************************************************************************************************************
- *
- * A mangler for storing files in the tile cache.
- *
- * @author Fabrizio Giudici
- *
- **************************************************************************************************************************************************************/
- @UtilityClass
- public class NameMangler
- {
- /***********************************************************************************************************************************************************
- * Mangles the given URL returning the local path to be used on the filesystem. The returned path is the original parameter prefixed with two directories
- * such as <code>ab/cd/</code> where abcd is the CRC16 of the original URL.
- * @param url the url to mangle
- * @return the mangled path
- **********************************************************************************************************************************************************/
- @Nonnull
- public static String mangle (@Nonnull final String url)
- {
- var s = url.substring("http://".length());
- int i = s.indexOf('/');
-
- if (i > 0)
- {
- s = s.substring(i + 1);
- }
-
- i = s.lastIndexOf('?');
-
- if (i >= 0)
- {
- s = s.substring(0, i);
- }
-
- var crc16 = "0000" + Integer.toHexString(CRC16.crc16(s));
- crc16 = crc16.substring(crc16.length() - 4);
- return crc16.substring(0, 2) + "/" + crc16.substring(2, 4) + "/" + s;
- }
- }