/*   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.SchemaType;
import org.apache.xmlbeans.SimpleValue;
import org.apache.xmlbeans.XmlErrorCodes;
import org.apache.xmlbeans.XmlObject;
import org.apache.xmlbeans.impl.common.ValidationContext;
import org.apache.xmlbeans.impl.schema.BuiltinSchemaTypeSystem;
import org.apache.xmlbeans.impl.util.MathUtil;

import java.math.BigDecimal;
import java.math.BigInteger;

public abstract class JavaIntegerHolder extends XmlObjectBase {
    public SchemaType schemaType() {
        return BuiltinSchemaTypeSystem.ST_INTEGER;
    }

    private BigInteger _value;

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

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

    protected void set_text(String s) {
        set_BigInteger(lex(s, _voorVc));
    }

    public static BigInteger lex(String s, ValidationContext vc) {
        if (!s.isEmpty() && s.charAt(0) == '+') {
            s = s.substring(1);
        }

        try {
            return MathUtil.parseAsBigInteger(s);
        } catch (Exception e) {
            vc.invalid(XmlErrorCodes.INTEGER, new Object[]{s});
            return null;
        }
    }

    protected void set_nil() {
        _value = null;
    }

    // numerics: fractional
    public BigDecimal getBigDecimalValue() {
        check_dated();
        return _value == null ? null : new BigDecimal(_value);
    }

    public BigInteger getBigIntegerValue() {
        check_dated();
        return _value;
    }

    // setters
    protected void set_BigDecimal(BigDecimal v) {
        _value = MathUtil.toBigInteger(v);
    }

    protected void set_BigInteger(BigInteger v) {
        _value = v;
    }

    // comparators
    protected int compare_to(XmlObject i) {
        if (((SimpleValue) i).instanceType().getDecimalSize() > SchemaType.SIZE_BIG_INTEGER) {
            return -i.compareTo(this);
        }

        return _value.compareTo(((XmlObjectBase) i).getBigIntegerValue());
    }

    protected boolean equal_to(XmlObject i) {
        if (((SimpleValue) i).instanceType().getDecimalSize() > SchemaType.SIZE_BIG_INTEGER) {
            return i.valueEquals(this);
        }

        return _value.equals(((XmlObjectBase) i).getBigIntegerValue());
    }

    private static final BigInteger _maxlong = BigInteger.valueOf(Long.MAX_VALUE);
    private static final BigInteger _minlong = BigInteger.valueOf(Long.MIN_VALUE);

    /**
     * Note, this is carefully aligned with hash codes for all xsd:decimal
     * primitives.
     */
    protected int value_hash_code() {
        if (_value.compareTo(_maxlong) > 0 ||
            _value.compareTo(_minlong) < 0) {
            return _value.hashCode();
        }

        long longval = _value.longValue();

        return (int) ((longval >> 32) * 19 + longval);
    }
}
