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 * reserved comment block

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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,

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package com.sun.org.apache.xerces.internal.impl.dv.xs;

import com.sun.org.apache.xerces.internal.impl.dv.InvalidDatatypeValueException;

import com.sun.org.apache.xerces.internal.util.URI;

import com.sun.org.apache.xerces.internal.impl.dv.ValidationContext;

/**

 * Represent the schema type "anyURI"

 *

 * @xerces.internal

 *

 * @author Neeraj Bajaj, Sun Microsystems, inc.

 * @author Sandy Gao, IBM

 *

 */

public class AnyURIDV extends TypeValidator {

    private static final URI BASE_URI;

    static {

        URI uri = null;

        try {

            uri = new URI("abc://def.ghi.jkl");

        } catch (URI.MalformedURIException ex) {

        }

        BASE_URI = uri;

    }

    public short getAllowedFacets(){

        return (XSSimpleTypeDecl.FACET_LENGTH | XSSimpleTypeDecl.FACET_MINLENGTH | XSSimpleTypeDecl.FACET_MAXLENGTH | XSSimpleTypeDecl.FACET_PATTERN | XSSimpleTypeDecl.FACET_ENUMERATION | XSSimpleTypeDecl.FACET_WHITESPACE );

    }

    // before we return string we have to make sure it is correct URI as per spec.

    // for some types (string and derived), they just return the string itself

    public Object getActualValue(String content, ValidationContext context) throws InvalidDatatypeValueException {

        // check 3.2.17.c0 must: URI (rfc 2396/2723)

        try {

            if( content.length() != 0 ) {

                // encode special characters using XLink 5.4 algorithm

                final String encoded = encode(content);

                // Support for relative URLs

                // According to Java 1.1: URLs may also be specified with a

                // String and the URL object that it is related to.

                new URI(BASE_URI, encoded );

            }

        } catch (URI.MalformedURIException ex) {

            throw new InvalidDatatypeValueException("cvc-datatype-valid.1.2.1", new Object[]{content, "anyURI"});

        }

        // REVISIT: do we need to return the new URI object?

        return content;

    }

    // which ASCII characters need to be escaped

    private static boolean gNeedEscaping[] = new boolean[128];

    // the first hex character if a character needs to be escaped

    private static char gAfterEscaping1[] = new char[128];

    // the second hex character if a character needs to be escaped

    private static char gAfterEscaping2[] = new char[128];

    private static char[] gHexChs = {'0', '1', '2', '3', '4', '5', '6', '7',

                                     '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};

    // initialize the above 3 arrays

    static {

        for (int i = 0; i <= 0x1f; i++) {

            gNeedEscaping[i] = true;

            gAfterEscaping1[i] = gHexChs[i >> 4];

            gAfterEscaping2[i] = gHexChs[i & 0xf];

        }

        gNeedEscaping[0x7f] = true;

        gAfterEscaping1[0x7f] = '7';

        gAfterEscaping2[0x7f] = 'F';

        char[] escChs = {' ', '<', '>', '"', '{', '}',

                         '|', '\\', '^', '~', '`'};

        int len = escChs.length;

        char ch;

        for (int i = 0; i < len; i++) {

            ch = escChs[i];

            gNeedEscaping[ch] = true;

            gAfterEscaping1[ch] = gHexChs[ch >> 4];

            gAfterEscaping2[ch] = gHexChs[ch & 0xf];

        }

    }

    // To encode special characters in anyURI, by using %HH to represent

    // special ASCII characters: 0x00~0x1F, 0x7F, ' ', '<', '>', etc.

    // and non-ASCII characters (whose value >= 128).

    private static String encode(String anyURI){

        int len = anyURI.length(), ch;

        StringBuffer buffer = new StringBuffer(len*3);

        // for each character in the anyURI

        int i = 0;

        for (; i < len; i++) {

            ch = anyURI.charAt(i);

            // if it's not an ASCII character, break here, and use UTF-8 encoding

            if (ch >= 128)

                break;

            if (gNeedEscaping[ch]) {

                buffer.append('%');

                buffer.append(gAfterEscaping1[ch]);

                buffer.append(gAfterEscaping2[ch]);

            }

            else {

                buffer.append((char)ch);

            }

        }

        // we saw some non-ascii character

        if (i < len) {

            // get UTF-8 bytes for the remaining sub-string

            byte[] bytes = null;

            byte b;

            try {

                bytes = anyURI.substring(i).getBytes("UTF-8");

            } catch (java.io.UnsupportedEncodingException e) {

                // should never happen

                return anyURI;

            }

            len = bytes.length;

            // for each byte

            for (i = 0; i < len; i++) {

                b = bytes[i];

                // for non-ascii character: make it positive, then escape

                if (b < 0) {

                    ch = b + 256;

                    buffer.append('%');

                    buffer.append(gHexChs[ch >> 4]);

                    buffer.append(gHexChs[ch & 0xf]);

                }

                else if (gNeedEscaping[b]) {

                    buffer.append('%');

                    buffer.append(gAfterEscaping1[b]);

                    buffer.append(gAfterEscaping2[b]);

                }

                else {

                    buffer.append((char)b);

                }

            }

        }

        // If encoding happened, create a new string;

        // otherwise, return the orginal one.

        if (buffer.length() != len) {

            return buffer.toString();

        }

        else {

            return anyURI;

        }

    }

} // class AnyURIDV