org.apache.xmlbeans.impl.values.JavaBase64Holder Maven / Gradle / Ivy

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The Apache Commons Codec package contains simple encoder and decoders for various formats such as Base64 and Hexadecimal. In addition to these widely used encoders and decoders, the codec package also maintains a collection of phonetic encoding utilities.
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/*   Copyright 2004 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 org.apache.xmlbeans.impl.values;

import org.apache.xmlbeans.impl.schema.BuiltinSchemaTypeSystem;

import org.apache.xmlbeans.impl.util.Base64;
import org.apache.xmlbeans.XmlObject;
import org.apache.xmlbeans.XmlErrorCodes;
import org.apache.xmlbeans.XmlBase64Binary;
import org.apache.xmlbeans.SchemaType;
import org.apache.xmlbeans.impl.common.ValidationContext;
import org.apache.xmlbeans.impl.common.QNameHelper;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;
import java.io.UnsupportedEncodingException;

public abstract class JavaBase64Holder extends XmlObjectBase
{
    public SchemaType schemaType()
        { return BuiltinSchemaTypeSystem.ST_BASE_64_BINARY; }

    protected byte[] _value;

    // SIMPLE VALUE ACCESSORS BELOW -------------------------------------------

    // gets raw text value
    protected String compute_text(NamespaceManager nsm)
    {
        return new String(Base64.encode(_value));
    }
    protected void set_text(String s)
    {
        _hashcached = false;
        if (_validateOnSet())
            _value = validateLexical(s, schemaType(), _voorVc);
        else
            _value = lex(s, _voorVc);
    }
    protected void set_nil()
    {
        _hashcached = false;
        _value = null;
    }

    public static byte[] lex(String v, ValidationContext c)
    {
        byte[] vBytes = null;
        try
        {
            vBytes = v.getBytes("UTF-8");
        }
        catch(UnsupportedEncodingException uee)
        {
            // should never happen - UTF-8 is always supported
        }
        final byte[] bytes = Base64.decode(vBytes);

        if (bytes == null)
        {
            // TODO - get a decent error with line numbers and such here
            c.invalid(XmlErrorCodes.BASE64BINARY, new Object[] { "not encoded properly" });
        }

        return bytes;
    }

    public static byte[] validateLexical(String v, SchemaType sType, ValidationContext context)
    {
        final byte[] bytes = lex(v, context);
        if (bytes == null) return null;

        if (!sType.matchPatternFacet(v))
        {
            context.invalid(XmlErrorCodes.DATATYPE_VALID$PATTERN_VALID$NO_VALUE,
                new Object[] { "base 64", QNameHelper.readable(sType) });
            return null;
        }

        return bytes;
    }

    public byte[] getByteArrayValue()
    {
        check_dated();
        if (_value == null)
            return null;

        byte[] result = new byte[_value.length];
        System.arraycopy(_value, 0, result, 0, _value.length);
        return result;
    }

    // setters
    protected void set_ByteArray(byte[] ba)
    {
        _hashcached = false;
        _value = new byte[ba.length];
        System.arraycopy(ba, 0, _value, 0, ba.length);
    }

    // comparators
    protected boolean equal_to(XmlObject i)
    {
        byte[] ival = ((XmlBase64Binary) i).getByteArrayValue();
        return Arrays.equals(_value, ival);
    }

    //because computing hashcode is expensive we'll cache it
    protected boolean _hashcached = false;
    protected int hashcode = 0;
    protected static MessageDigest md5;
    static
    {
        try
        {
            md5 = MessageDigest.getInstance("MD5");
        }
        catch( NoSuchAlgorithmException e )
        {
            throw new IllegalStateException("Cannot find MD5 hash Algorithm");
        }
    }

    protected int value_hash_code()
    {
        if( _hashcached )
            return hashcode;

        _hashcached = true;

        if( _value == null )
            return hashcode = 0;

        byte[] res = md5.digest(_value);
        return hashcode = res[0]<<24 + res[1]<<16 + res[2]<<8 + res[3];
    }
}