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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.hudi.common.util;
import java.util.BitSet;
/**
* Utils to encode/decode the partition path.
* This code is mainly copy from Hive (org.apache.hadoop.hive.common.FileUtils).
*/
public class PartitionPathEncodeUtils {
public static final String DEPRECATED_DEFAULT_PARTITION_PATH = "default";
public static final String DEFAULT_PARTITION_PATH = "__HIVE_DEFAULT_PARTITION__";
static BitSet charToEscape = new BitSet(128);
static {
for (char c = 0; c < ' '; c++) {
charToEscape.set(c);
}
/**
* ASCII 01-1F are HTTP control characters that need to be escaped.
* \u000A and \u000D are \n and \r, respectively.
*/
char[] clist = new char[] {'\u0001', '\u0002', '\u0003', '\u0004',
'\u0005', '\u0006', '\u0007', '\u0008', '\u0009', '\n', '\u000B',
'\u000C', '\r', '\u000E', '\u000F', '\u0010', '\u0011', '\u0012',
'\u0013', '\u0014', '\u0015', '\u0016', '\u0017', '\u0018', '\u0019',
'\u001A', '\u001B', '\u001C', '\u001D', '\u001E', '\u001F',
'"', '#', '%', '\'', '*', '/', ':', '=', '?', '\\', '\u007F', '{',
'[', ']', '^'};
for (char c : clist) {
charToEscape.set(c);
}
}
static boolean needsEscaping(char c) {
return c >= 0 && c < charToEscape.size() && charToEscape.get(c);
}
public static String escapePathName(String path) {
return escapePathName(path, null);
}
/**
* Escapes a path name.
* @param path The path to escape.
* @param defaultPath
* The default name for the path, if the given path is empty or null.
* @return An escaped path name.
*/
public static String escapePathName(String path, String defaultPath) {
if (path == null || path.length() == 0) {
if (defaultPath == null) {
// previously, when path is empty or null and no default path is specified,
// "default" was the return value for escapePathName
return DEFAULT_PARTITION_PATH;
} else {
return defaultPath;
}
}
StringBuilder sb = new StringBuilder();
for (int i = 0; i < path.length(); i++) {
char c = path.charAt(i);
if (needsEscaping(c)) {
sb.append('%');
sb.append(String.format("%1$02X", (int) c));
} else {
sb.append(c);
}
}
return sb.toString();
}
public static String unescapePathName(String path) {
StringBuilder sb = new StringBuilder();
for (int i = 0; i < path.length(); i++) {
char c = path.charAt(i);
if (c == '%' && i + 2 < path.length()) {
int code = -1;
try {
code = Integer.parseInt(path.substring(i + 1, i + 3), 16);
} catch (Exception e) {
code = -1;
}
if (code >= 0) {
sb.append((char) code);
i += 2;
continue;
}
}
sb.append(c);
}
return sb.toString();
}
public static String escapePartitionValue(String value) {
if (value == null || value.isEmpty()) {
return DEFAULT_PARTITION_PATH;
} else {
return escapePathName(value);
}
}
}
