/*
 * The Apache Software License, Version 1.1
 *
 *
 * Copyright (c) 2001 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Xerces" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache",
 *    nor may "Apache" appear in their name, without prior written
 *    permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation and was
 * originally based on software copyright (c) 2001, International
 * Business Machines, Inc., http://www.apache.org.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

package org.apache.xerces.impl.v2.datatypes;

//internal imports
import org.apache.xerces.impl.v2.util.Base64;

//java imports
import java.io.UnsupportedEncodingException;
/**
 * @version $Id$
 */
public class Base64BinaryDV extends AbstractStringDV{

    // for most DV classes, this is the same as the DV_?? value defined
    // in XSSimpleTypeDecl that's corresponding to that class. But for
    // ID/IDREF/ENTITY, the privitivaDV is DV_STRING.

    public short getPrimitiveDV(){
        return XSSimpleTypeDecl.DV_BASE64BINARY;
    }

    // convert a string to a compiled form. for example,
    // for number types (decimal, double, float, and types derived from them),
    // get the BigDecimal, Double, Flout object.
    // for some types (string and derived), they just return the string itself
    public Object getCompiledValue(String content) throws InvalidDatatypeValueException{
        if (getDataLength(content) < 0) {
            throw new InvalidDatatypeValueException( "Value '"+content+"' is not encoded in Hex" );
        }
        return content;
    }


    // the parameters are in compiled form (from getCompiledValue)
    public boolean isEqual(Object value1, Object value2){

        return compare(value1,value2) == 0 ? true : false;

    }//isEqual()

    // the following methods might not be supported by every DV.
    // but XSSimpleTypeDecl should know which type supports which methods,
    // and it's an *internal* error if a method is called on a DV that
    // doesn't support it.

    //compiled value is string in this case ,as we return string for all derived by string.
    public  int compare(Object value1, Object value2){

        String str1 = (String)value1;
        String str2 = (String)value2;

        if (str1 == null || str2 == null)
            return -1;

        if (str1 == str2 || str1.equals(str2))
            return 0;

        byte[] data1= Base64.decode(str1.getBytes());
        byte[] data2= Base64.decode(str2.getBytes());

        if (data1 == null || data2 == null)
            return -1;

        for (int i = 0; i < Math.min(data1.length, data2.length); i++){
            if (data1[i] < data2[i])
                return -1;
            else if (data1[i] > data2[i])
                return 1;
        }

        if (data1.length == data2.length)
            return 0;

        return data1.length > data2.length ? 1 : -1;

    }//compare()


    //compiled value is string in this case ,as we return string for all derived by string.
    //for base64 length is measured in octets of binary data.
    public int getDataLength(Object value){
        int x = -1;
        String content = (String)value;
        try {
            x = Base64.getDecodedDataLength(content.getBytes("utf-8"));
        }
        catch (UnsupportedEncodingException e) {
        }
        finally {
            return x;
        }
    }//getDataLength()


} // class Base64BinaryDV