/*
* @(#)$Id: XDecimal.java 3619 2008-03-26 07:23:03Z yui $
*
* Copyright 2006-2008 Makoto YUI
*
* 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.
*
* Contributors:
* Makoto YUI - initial implementation
*/
package xbird.xquery.dm.value.literal;
import java.io.*;
import java.math.BigDecimal;
import java.math.RoundingMode;
import xbird.util.lang.ObjectUtils;
import xbird.xquery.XQueryException;
import xbird.xquery.dm.value.AtomicValue;
import xbird.xquery.dm.value.Item;
import xbird.xquery.dm.value.xsi.BooleanValue;
import xbird.xquery.meta.DynamicContext;
import xbird.xquery.type.AtomicType;
import xbird.xquery.type.TypeTable;
import xbird.xquery.type.xs.DecimalType;
/**
*
* <DIV lang="en"></DIV>
* <DIV lang="ja"></DIV>
*
* @author Makoto YUI (yuin405+xbird@gmail.com)
*/
public final class XDecimal extends XNumber {
private static final long serialVersionUID = -8768229815740382391L;
public static final int ID = 10;
private static final int DECIMAL_PRECISION = 18;
private BigDecimal value;
public XDecimal() {
super();
}
public XDecimal(String literal) {
this(literal, DecimalType.DECIMAL);
}
public XDecimal(String literal, DecimalType type) {
this(new BigDecimal(literal), type);
}
public XDecimal(BigDecimal value) {
this(value, DecimalType.DECIMAL);
}
public XDecimal(BigDecimal value, DecimalType type) {
super(value.toPlainString(), type); /* value assumed to be trimed */
this.value = value;
}
public BigDecimal getValue() {
return value;
}
public Number getNumber() {
return value;
}
@Override
public int compareTo(Item trg) {
if(trg instanceof XDecimal) {
BigDecimal trgValue = ((XDecimal) trg).value;
return value.compareTo(trgValue);
}
return super.compareTo(trg);
}
public BigDecimal toJavaObject() throws XQueryException {
return value;
}
public static XDecimal valueOf(BigDecimal v) {
return new XDecimal(v);
}
public boolean isNaN() {
return false;
}
public XDecimal negate() {
this.value = value.negate();
onUpdate();
return this;
}
public XNumber ceil() {
this.value = value.setScale(0, RoundingMode.CEILING);
onUpdate();
return this;
}
public XNumber floor() {
this.value = value.setScale(0, RoundingMode.FLOOR);
onUpdate();
return this;
}
public XNumber round() {
final int signum = value.signum();
if(signum > 0) {
this.value = value.setScale(0, RoundingMode.HALF_UP);
} else if(signum < 0) {
this.value = value.setScale(0, RoundingMode.HALF_DOWN);
}
onUpdate();
return this;
}
public XNumber roundHalfToEven(int precision) {
this.value = value.setScale(precision, RoundingMode.HALF_EVEN);
onUpdate();
return this;
}
private String _canonical = null;
@Override
protected void onUpdate() {
_canonical = null;
String sv = toString();
setStringValue(sv);
}
@Override
public BigDecimal asDecimal() {
return value;
}
@Override
public String stringValue() {
return this.toString();
}
@Override
public String toString() {
if(_canonical == null) {
String src = value.toPlainString();
final String res;
if(src.indexOf('.') == -1) {
res = src;
} else {
// remove trailing zeros
int last = src.length();
while(--last > 0) {
if(src.charAt(last) != '0') {
break;
}
}
if(src.charAt(last) == '.') { // for the case 'xxx.000'
--last;
}
res = src.substring(0, last + 1);
}
this._canonical = res;
return res;
}
return _canonical;
}
@Override
public <T extends AtomicValue> T castAs(AtomicType trgType, DynamicContext dynEnv)
throws XQueryException {
final int ttid = trgType.getTypeId();
final AtomicValue v;
switch(ttid) {
case TypeTable.BOOLEAN_TID:
v = new BooleanValue(value.signum() != 0);
break;
case TypeTable.DECIMAL_TID:
case TypeTable.NUMERIC_TID:
v = this;
break;
case TypeTable.INTEGER_TID:
v = XInteger.valueOf(asLong());
break;
case TypeTable.FLOAT_TID:
v = XFloat.valueOf(value.floatValue());
break;
case TypeTable.DOUBLE_TID:
v = XDouble.valueOf(asDouble());
break;
default:
v = super.castAs(trgType, dynEnv);
break;
}
return (T) v;
}
public static BigDecimal divide(BigDecimal src, BigDecimal divisor) {
return src.divide(divisor, DECIMAL_PRECISION, BigDecimal.ROUND_HALF_EVEN);
}
public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
this._lexicalValue = ObjectUtils.readString(in);
this._type = AtomicType.readAtomicType(in);
this.value = (BigDecimal) in.readObject();
}
public void writeExternal(ObjectOutput out) throws IOException {
ObjectUtils.writeString(out, _lexicalValue);
_type.writeExternal(out);
out.writeObject(value);
}
@Override
public int getIdentifier() {
return ID;
}
}