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package org.eclipse.equinox.internal.p2.engine;
/**
* Utility class to encode forward slash characters so that strings containing
* forward slashes can be used as node names with secure preferences. It is
* the responsibility of the consumer to manually encode such strings before
* attempting to obtain corresponding nodes from secure preferences.
* <p>
* Internally, the class uses a subset of JIT encoding. The forward slashes
* and backward slashes are encoded.
* </p><p>
* This class is not intended to be instantiated or subclassed by users.
* </p>
*/
final public class SlashEncode {
final private static char SLASH = '/';
final private static char BACK_SLASH = '\\';
final private static String ENCODED_SLASH = "\\2f"; //$NON-NLS-1$
final private static String ENCODED_BACK_SLASH = "\\5c"; //$NON-NLS-1$
static public String decode(String str) {
if (str == null)
return null;
int size = str.length();
if (size == 0)
return str;
StringBuilder processed = new StringBuilder(size);
int processedPos = 0;
for (int i = 0; i < size; i++) {
char c = str.charAt(i);
if (c == BACK_SLASH) {
if (i + 2 >= size)
continue;
String encoded = str.substring(i, i + 3);
char decoded = 0;
if (ENCODED_SLASH.equals(encoded))
decoded = SLASH;
else if (ENCODED_BACK_SLASH.equals(encoded))
decoded = BACK_SLASH;
if (decoded == 0)
continue;
if (i > processedPos)
processed.append(str.substring(processedPos, i));
processed.append(decoded);
processedPos = i + 3;
i += 2; // skip over remaining encoded portion
}
}
if (processedPos == 0)
return str;
if (processedPos < size)
processed.append(str.substring(processedPos));
return new String(processed);
}
static public String encode(String str) {
if (str == null)
return null;
int size = str.length();
if (size == 0)
return str;
StringBuilder processed = new StringBuilder(size);
int processedPos = 0;
for (int i = 0; i < size; i++) {
char c = str.charAt(i);
if (c == SLASH || c == BACK_SLASH) {
if (i > processedPos)
processed.append(str.substring(processedPos, i));
if (c == SLASH)
processed.append(ENCODED_SLASH);
else if (c == BACK_SLASH)
processed.append(ENCODED_BACK_SLASH);
processedPos = i + 1;
}
}
if (processedPos == 0)
return str;
if (processedPos < size)
processed.append(str.substring(processedPos));
return new String(processed);
}
}
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