Java URI Encode encode(String str, boolean fullUri)

Description

Code taken from rhino-1.7R1/src/org/mozilla/javascript/NativeGlobal.java and slightly adapted.

License

Open Source License

Declaration

private static String encode(String str, boolean fullUri) throws URISyntaxException 

Method Source Code

//package com.java2s;

import java.net.URISyntaxException;

public class Main {
    private static final String URI_DECODE_RESERVED = ";/?:@&=+$,#";

    /**/*  w  w w. ja va 2s .  c o m*/
     * Code taken from rhino-1.7R1/src/org/mozilla/javascript/NativeGlobal.java 
     * and slightly adapted. It is released under the MPL 1.1 and GPL 2.0.
     */
    private static String encode(String str, boolean fullUri) throws URISyntaxException {
        byte[] utf8buf = null;
        StringBuilder sb = null;

        for (int k = 0, length = str.length(); k != length; ++k) {
            char c = str.charAt(k);
            if (encodeUnescaped(c, fullUri)) {
                if (sb != null) {
                    sb.append(c);
                }
            } else {
                if (sb == null) {
                    sb = new StringBuilder(length + 3);
                    sb.append(str);
                    sb.setLength(k);
                    utf8buf = new byte[6];
                }
                if (0xDC00 <= c && c <= 0xDFFF) {
                    throw new URISyntaxException(str, c + " outside of valid range");
                }
                int value;
                if (c < 0xD800 || 0xDBFF < c) {
                    value = c;
                } else {
                    k++;
                    if (k == length) {
                        throw new URISyntaxException(str, "out of chars");
                    }
                    char c2 = str.charAt(k);
                    if (!(0xDC00 <= c2 && c2 <= 0xDFFF)) {
                        throw new URISyntaxException(str, "outside of valid range");
                    }
                    value = ((c - 0xD800) << 10) + (c2 - 0xDC00) + 0x10000;
                }
                int L = oneUcs4ToUtf8Char(utf8buf, value);
                assert utf8buf != null;
                for (int j = 0; j < L; j++) {
                    int d = 0xff & utf8buf[j];
                    sb.append('%');
                    sb.append(toHexChar(d >>> 4));
                    sb.append(toHexChar(d & 0xf));
                }
            }
        }
        return (sb == null) ? str : sb.toString();
    }

    private static boolean encodeUnescaped(char c, boolean fullUri) {
        if (('A' <= c && c <= 'Z') || ('a' <= c && c <= 'z') || ('0' <= c && c <= '9')) {
            return true;
        }
        if ("-_.!~*'()".indexOf(c) >= 0)
            return true;
        if (fullUri) {
            return URI_DECODE_RESERVED.indexOf(c) >= 0;
        }
        return false;
    }

    private static int oneUcs4ToUtf8Char(byte[] utf8Buffer, int ucs4Char) {
        int utf8Length = 1;

        //JS_ASSERT(ucs4Char <= 0x7FFFFFFF);
        if ((ucs4Char & ~0x7F) == 0)
            utf8Buffer[0] = (byte) ucs4Char;
        else {
            int i;
            int a = ucs4Char >>> 11;
            utf8Length = 2;
            while (a != 0) {
                a >>>= 5;
                utf8Length++;
            }
            i = utf8Length;
            while (--i > 0) {
                utf8Buffer[i] = (byte) ((ucs4Char & 0x3F) | 0x80);
                ucs4Char >>>= 6;
            }
            utf8Buffer[0] = (byte) (0x100 - (1 << (8 - utf8Length)) + ucs4Char);
        }
        return utf8Length;
    }

    private static char toHexChar(int i) {
        if (i >> 4 != 0)
            throw new RuntimeException();
        return (char) ((i < 10) ? i + '0' : i - 10 + 'a');
    }
}

Related

1. encode(String uri)
2. encodeForURI(String uriPart)
3. encodeIfNeeded(String uri)
4. encodeUri(final String uri)