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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.XmlObject;
import org.apache.xmlbeans.XmlErrorCodes;
import org.apache.xmlbeans.GDate;
import org.apache.xmlbeans.GDateSpecification;
import org.apache.xmlbeans.GDateBuilder;
import org.apache.xmlbeans.SchemaType;
import org.apache.xmlbeans.impl.common.ValidationContext;
import org.apache.xmlbeans.impl.common.QNameHelper;

import java.util.Date;
import java.util.Calendar;

public abstract class JavaGDateHolderEx extends XmlObjectBase
{
    public JavaGDateHolderEx(SchemaType type, boolean complex)
    {
        _schemaType = type;
        initComplexType(complex, false);
    }

    public SchemaType schemaType()
        { return _schemaType; }

    private SchemaType _schemaType;
    private GDate _value;

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

    // sets/gets raw text value
    protected String compute_text(NamespaceManager nsm)
        { return _value == null ? "" : _value.toString(); }

    protected void set_text(String s)
    {
        GDate newVal;
        if (_validateOnSet())
            newVal = validateLexical(s, _schemaType, _voorVc);
        else
            newVal = lex(s, _schemaType, _voorVc);

        if (_validateOnSet() && newVal != null)
            validateValue(newVal, _schemaType, _voorVc);

        _value = newVal;
    }

    public static GDate lex(String v, SchemaType sType, ValidationContext context)
    {
        GDate date = null;

        try
        {
            date = new GDate(v);
        }
        catch (Exception e)
        {
            context.invalid(XmlErrorCodes.DATE, new Object[] { v });
        }

        if (date != null)
        {
            if (date.getBuiltinTypeCode() != sType.getPrimitiveType().getBuiltinTypeCode())
            {
                context.invalid(XmlErrorCodes.DATE, new Object[] { "wrong type: " + v });
                date = null;
            }
            else if (!date.isValid())
            {
                context.invalid(XmlErrorCodes.DATE, new Object[] { v });
                date = null;
            }
        }

        return date;
    }

    public static GDate validateLexical(String v, SchemaType sType, ValidationContext context)
    {

        GDate date = lex(v, sType, context);

        if (date != null && sType.hasPatternFacet())
            if (!sType.matchPatternFacet(v))
                context.invalid(XmlErrorCodes.DATATYPE_VALID$PATTERN_VALID,
                    new Object[] { "date", v, QNameHelper.readable(sType) });

        return date;
    }

    public static void validateValue(GDateSpecification v, SchemaType sType, ValidationContext context)
    {
        XmlObject x;
        GDate g;

        if (v.getBuiltinTypeCode() != sType.getPrimitiveType().getBuiltinTypeCode())
            context.invalid(XmlErrorCodes.DATE, new Object[] { "Date (" + v + ") does not have the set of fields required for " + QNameHelper.readable(sType) });

        if ((x = sType.getFacet(SchemaType.FACET_MIN_EXCLUSIVE)) != null)
            if (v.compareToGDate(g = ((XmlObjectBase)x).gDateValue()) <= 0)
                context.invalid(XmlErrorCodes.DATATYPE_MIN_EXCLUSIVE_VALID,
                    new Object[] { "date", v, g, QNameHelper.readable(sType) });

        if ((x = sType.getFacet(SchemaType.FACET_MIN_INCLUSIVE)) != null)
            if (v.compareToGDate(g = ((XmlObjectBase)x).gDateValue()) < 0)
                context.invalid(XmlErrorCodes.DATATYPE_MIN_INCLUSIVE_VALID,
                    new Object[] { "date", v, g, QNameHelper.readable(sType) });

        if ((x = sType.getFacet(SchemaType.FACET_MAX_EXCLUSIVE)) != null)
            if (v.compareToGDate(g = ((XmlObjectBase)x).gDateValue()) >= 0)
                context.invalid(XmlErrorCodes.DATATYPE_MAX_EXCLUSIVE_VALID,
                    new Object[] { "date", v, g, QNameHelper.readable(sType) });

        if ((x = sType.getFacet(SchemaType.FACET_MAX_INCLUSIVE)) != null)
            if (v.compareToGDate(g = ((XmlObjectBase)x).gDateValue()) > 0)
                context.invalid(XmlErrorCodes.DATATYPE_MAX_INCLUSIVE_VALID,
                    new Object[] { "date", v, g, QNameHelper.readable(sType) });

        XmlObject[] vals = sType.getEnumerationValues();
        if (vals != null)
        {
            for (int i = 0; i < vals.length; i++)
                if (v.compareToGDate(((XmlObjectBase)vals[i]).gDateValue()) == 0)
                    return;
            context.invalid(XmlErrorCodes.DATATYPE_ENUM_VALID,
                new Object[] { "date", v, QNameHelper.readable(sType) });
        }
    }

    protected void set_nil()
    {
        _value = null;
    }

    // numerics: gYear, gMonth, gDay accept an integer
    public int getIntValue()
    {
        int code = schemaType().getPrimitiveType().getBuiltinTypeCode();

        if (code != SchemaType.BTC_G_DAY &&
                code != SchemaType.BTC_G_MONTH &&
                code != SchemaType.BTC_G_YEAR)
            throw new XmlValueOutOfRangeException();

        check_dated();

        if (_value == null)
            return 0;

        switch (code)
        {
            case SchemaType.BTC_G_DAY:
                return _value.getDay();
            case SchemaType.BTC_G_MONTH:
                return _value.getMonth();
            case SchemaType.BTC_G_YEAR:
                return _value.getYear();
            default:
                assert(false);
                throw new IllegalStateException();
        }
    }

    public GDate getGDateValue()
    {
        check_dated();

        if (_value == null)
            return null;

        return _value;
    }
    
    public Calendar getCalendarValue()
    {
        check_dated();

        if (_value == null)
            return null;

        return _value.getCalendar();
    }

    public Date getDateValue()
    {
        check_dated();

        if (_value == null)
            return null;

        return _value.getDate();
    }

    // setters
    protected void set_int(int v)
    {
        int code = schemaType().getPrimitiveType().getBuiltinTypeCode();

        if (code != SchemaType.BTC_G_DAY &&
                code != SchemaType.BTC_G_MONTH &&
                code != SchemaType.BTC_G_YEAR)
            throw new XmlValueOutOfRangeException();

        GDateBuilder value = new GDateBuilder();

        switch (code)
        {
            case SchemaType.BTC_G_DAY:
                value.setDay(v); break;
            case SchemaType.BTC_G_MONTH:
                value.setMonth(v); break;
            case SchemaType.BTC_G_YEAR:
                value.setYear(v); break;
        }

        if (_validateOnSet())
            validateValue(value, _schemaType, _voorVc);

        _value = value.toGDate();
    }

    protected void set_GDate(GDateSpecification v)
    {
        int code = schemaType().getPrimitiveType().getBuiltinTypeCode();

        GDate candidate;

        if (v.isImmutable() && (v instanceof GDate) && v.getBuiltinTypeCode() == code)
            candidate = (GDate)v;
        else
        {
            // truncate extra fields from the date if necessary.
            if (v.getBuiltinTypeCode() != code)
            {
                GDateBuilder gDateBuilder = new GDateBuilder(v);
                gDateBuilder.setBuiltinTypeCode(code);
                v = gDateBuilder;
            }
            candidate = new GDate(v);
        }

        if (_validateOnSet())
            validateValue(candidate, _schemaType, _voorVc);

        _value = candidate;
    }
    
    protected void set_Calendar(Calendar c)
    {
        int code = schemaType().getPrimitiveType().getBuiltinTypeCode();

        GDateBuilder gDateBuilder = new GDateBuilder(c);
        gDateBuilder.setBuiltinTypeCode(code);
        GDate value = gDateBuilder.toGDate();
 
        if (_validateOnSet())
            validateValue(value, _schemaType, _voorVc);

        _value = value;
    }

    protected void set_Date(Date v)
    {
        int code = schemaType().getPrimitiveType().getBuiltinTypeCode();

        if (code != SchemaType.BTC_DATE && code != SchemaType.BTC_DATE_TIME ||
            v == null)
            throw new XmlValueOutOfRangeException();

        GDateBuilder gDateBuilder = new GDateBuilder(v);
        gDateBuilder.setBuiltinTypeCode(code);
        GDate value = gDateBuilder.toGDate();
 
        if (_validateOnSet())
            validateValue(value, _schemaType, _voorVc);

        _value = value;
    }


    // comparators
    protected int compare_to(XmlObject obj)
    {
        return _value.compareToGDate(((XmlObjectBase)obj).gDateValue());
    }

    protected boolean equal_to(XmlObject obj)
    {
        return _value.equals(((XmlObjectBase)obj).gDateValue());
    }

    protected int value_hash_code()
    {
        return _value.hashCode();
    }
    
    protected void validate_simpleval(String lexical, ValidationContext ctx)
    {
        validateLexical(lexical, schemaType(), ctx);
        validateValue(gDateValue(), schemaType(), ctx);
    }
    
}