com.tasktop.c2c.server.common.web.shared.URLEncoding.java Source code

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Here is the source code for com.tasktop.c2c.server.common.web.shared.URLEncoding.java

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/*******************************************************************************
 * Copyright (c) 2010, 2012 Tasktop Technologies
 * Copyright (c) 2010, 2011 SpringSource, a division of VMware
 * 
 * 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 com.tasktop.c2c.server.common.web.shared;

import com.google.gwt.core.client.GWT;
import com.google.gwt.http.client.URL;

/**
 * An URL encoder that delegates to {@link URL GWT URL} when {@link GWT#isClient() in client mode}. Safe to use when
 * unit testing in Java.
 */
public class URLEncoding {

    private static final char[] chars = new char[] { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B',
            'C', 'D', 'E', 'F' };

    public static String encode(String part) {
        return encode(part, null);
    }

    /**
     * encode the given URI part.When {@link GWT#isClient() is client = true}, GWT client URL encoding is used.
     */
    public static String encode(String part, char[] excludes) {
        if (GWT.isClient()) {
            return URL.encode(part).replace("%20", "+");
        }
        StringBuilder result = new StringBuilder(part.length() + 10);
        for (int x = 0; x < part.length(); ++x) {
            // see http://en.wikipedia.org/wiki/Percent-encoding
            char c = part.charAt(x);
            if (isUnreserved(c) || excluded(c, excludes)) {
                result.append(c);
            } else {
                if (c == ' ') {
                    result.append('+');
                } else {
                    result.append('%');
                    result.append(chars[c >> 4]);
                    result.append(chars[c & 0x0F]);
                }
            }
        }
        return result.toString();
    }

    private static boolean excluded(char c, char[] excludes) {
        if (excludes == null) {
            return false;
        }
        for (int x = 0; x < excludes.length; ++x) {
            if (excludes[x] == c) {
                return true;
            }
        }
        return false;
    }

    /**
     * decode the given URI part. When {@link GWT#isClient() is client = true}, GWT client URL decoding is used.
     */
    public static String decode(String part) {
        if (GWT.isClient()) {
            return URL.decode(part.replace("+", "%20"));
        }
        StringBuilder result = new StringBuilder(part.length() + 10);
        for (int x = 0; x < part.length(); ++x) {
            // see http://en.wikipedia.org/wiki/Percent-encoding
            char c = part.charAt(x);
            if (isUnreserved(c)) {
                result.append(c);
            } else {
                if (c == '+') {
                    c = ' ';
                } else if (c == '%') {
                    c = (char) Integer.parseInt("" + part.charAt(++x) + part.charAt(++x), 16);
                }
                result.append(c);
            }
        }
        return result.toString();
    }

    private static boolean isUnreserved(char c) {
        return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || (c >= '0' && c <= '9') || c == '_' || c == '-'
                || c == '~' || c == '.';
    }

}