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Java example source code file (AnyURIDV.java)

This example Java source code file (AnyURIDV.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

anyuridv, base_uri, invaliddatatypevalueexception, object, stringbuffer, typevalidator, uri, utf\-8, validationcontext

The AnyURIDV.java Java example source code

/*
 * reserved comment block
 * DO NOT REMOVE OR ALTER!
 */
/*
 * Copyright 2001-2005 The Apache Software Foundation.
 *
 * Licensed 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,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

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

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