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/*******************************************************************************
* Copyright (c) 2004, 2008 Tasktop Technologies and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Tasktop Technologies - initial API and implementation
*******************************************************************************/
package org.eclipse.mylyn.internal.provisional.tasks.core;
/**
* @author Steffen Pingel
*/
public class TasksUtil {
public static String decode(String text) {
boolean escaped = false;
StringBuffer sb = new StringBuffer(text.length());
StringBuffer escapedText = new StringBuffer(4);
char[] chars = text.toCharArray();
for (char c : chars) {
if (c >= '0' && c <= '9' || c >= 'a' && c <= 'z' || c >= 'A' && c <= 'Z' || c == '.') {
if (escaped) {
escapedText.append(c);
} else {
sb.append(c);
}
} else if (c == '%') {
if (escaped) {
throw new IllegalArgumentException("Unexpected '%' sign in '" + text + "'");
}
escaped = !escaped;
} else if (c == '_') {
if (!escaped) {
throw new IllegalArgumentException("Unexpected '_' sign in '" + text + "'");
}
try {
sb.append((char) Integer.parseInt(escapedText.toString(), 16));
escapedText.setLength(0);
} catch (NumberFormatException e) {
throw new IllegalArgumentException("Invalid escape code in '" + text + "'");
}
escaped = !escaped;
} else {
throw new IllegalArgumentException("Unexpected character '" + c + "' in '" + text + "'");
}
}
return sb.toString();
}
public static String encode(String text) {
StringBuffer sb = new StringBuffer(text.length());
char[] chars = text.toCharArray();
for (char c : chars) {
if (c >= '0' && c <= '9' || c >= 'a' && c <= 'z' || c >= 'A' && c <= 'Z' || c == '.') {
sb.append(c);
} else {
sb.append("%" + Integer.toHexString(c).toUpperCase() + "_");
}
}
return sb.toString();
}
}
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