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/*
* Copyright (c) 2015 Pantheon Technologies s.r.o. and others. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 which accompanies this distribution,
* and is available at http://www.eclipse.org/legal/epl-v10.html
*/
package org.opendaylight.yangtools.yang.common;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Verify.verify;
import com.google.common.annotations.Beta;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Strings;
import java.math.BigDecimal;
import java.util.Optional;
import org.eclipse.jdt.annotation.NonNullByDefault;
import org.eclipse.jdt.annotation.Nullable;
import org.opendaylight.yangtools.concepts.Variant;
/**
* Dedicated type for YANG's 'type decimal64' type. This class is similar to {@link BigDecimal}, but provides more
* efficient storage, as it has fixed precision.
*
* @author Robert Varga
*/
@Beta
@NonNullByDefault
public class Decimal64 extends Number implements CanonicalValue {
public static final class Support extends AbstractCanonicalValueSupport {
public Support() {
super(Decimal64.class);
}
@Override
public Variant fromString(final String str) {
// https://tools.ietf.org/html/rfc6020#section-9.3.1
//
// A decimal64 value is lexically represented as an optional sign ("+"
// or "-"), followed by a sequence of decimal digits, optionally
// followed by a period ('.') as a decimal indicator and a sequence of
// decimal digits. If no sign is specified, "+" is assumed.
if (str.isEmpty()) {
return CanonicalValueViolation.variantOf("Empty string is not a valid decimal64 representation");
}
// Deal with optional sign
final boolean negative;
int idx;
switch (str.charAt(0)) {
case '-':
negative = true;
idx = 1;
break;
case '+':
negative = false;
idx = 1;
break;
default:
negative = false;
idx = 0;
}
// Sanity check length
if (idx == str.length()) {
return CanonicalValueViolation.variantOf("Missing digits after sign");
}
// Character limit, used for caching and cutting trailing zeroes
int limit = str.length() - 1;
// Skip any leading zeroes, but leave at least one
for (; idx < limit && str.charAt(idx) == '0'; idx++) {
final char ch = str.charAt(idx + 1);
if (ch < '0' || ch > '9') {
break;
}
}
// Integer part and its length
int intLen = 0;
long intPart = 0;
for (; idx <= limit; idx++, intLen++) {
final char ch = str.charAt(idx);
if (ch == '.') {
// Fractions are next
break;
}
if (intLen == MAX_FRACTION_DIGITS) {
return CanonicalValueViolation.variantOf(
"Integer part is longer than " + MAX_FRACTION_DIGITS + " digits");
}
intPart = 10 * intPart + toInt(ch, idx);
}
if (idx > limit) {
// No fraction digits, we are done
return Variant.ofFirst(new Decimal64((byte)1, intPart, 0, negative));
}
// Bump index to skip over period and check the remainder
idx++;
if (idx > limit) {
return CanonicalValueViolation.variantOf("Value '" + str + "' is missing fraction digits");
}
// Trim trailing zeroes, if any
while (idx < limit && str.charAt(limit) == '0') {
limit--;
}
final int fracLimit = MAX_FRACTION_DIGITS - intLen;
byte fracLen = 0;
long fracPart = 0;
for (; idx <= limit; idx++, fracLen++) {
final char ch = str.charAt(idx);
if (fracLen == fracLimit) {
return CanonicalValueViolation.variantOf("Fraction part longer than " + fracLimit + " digits");
}
fracPart = 10 * fracPart + toInt(ch, idx);
}
return Variant.ofFirst(new Decimal64(fracLen, intPart, fracPart, negative));
}
private static int toInt(final char ch, final int index) {
if (ch < '0' || ch > '9') {
throw new NumberFormatException("Illegal character at offset " + index);
}
return ch - '0';
}
}
private static final CanonicalValueSupport SUPPORT = new Support();
private static final long serialVersionUID = 1L;
private static final int MAX_FRACTION_DIGITS = 18;
private static final long[] SCALE = {
10,
100,
1000,
10000,
100000,
1000000,
10000000,
100000000,
1000000000,
10000000000L,
100000000000L,
1000000000000L,
10000000000000L,
100000000000000L,
1000000000000000L,
10000000000000000L,
100000000000000000L,
1000000000000000000L
};
static {
verify(SCALE.length == MAX_FRACTION_DIGITS);
}
private final byte scaleOffset;
private final long value;
@VisibleForTesting
Decimal64(final int fractionDigits, final long intPart, final long fracPart, final boolean negative) {
checkArgument(fractionDigits >= 1 && fractionDigits <= MAX_FRACTION_DIGITS);
this.scaleOffset = (byte) (fractionDigits - 1);
final long bits = intPart * SCALE[this.scaleOffset] + fracPart;
this.value = negative ? -bits : bits;
}
protected Decimal64(final Decimal64 other) {
this.scaleOffset = other.scaleOffset;
this.value = other.value;
}
public static Decimal64 valueOf(final byte byteVal) {
return byteVal < 0 ? new Decimal64(1, -byteVal, 0, true) : new Decimal64(1, byteVal, 0, false);
}
public static Decimal64 valueOf(final short shortVal) {
return shortVal < 0 ? new Decimal64(1, -shortVal, 0, true) : new Decimal64(1, shortVal, 0, false);
}
public static Decimal64 valueOf(final int intVal) {
return intVal < 0 ? new Decimal64(1, - (long)intVal, 0, true) : new Decimal64(1, intVal, 0, false);
}
public static Decimal64 valueOf(final long longVal) {
// XXX: we should be able to do something smarter here
return valueOf(Long.toString(longVal));
}
public static Decimal64 valueOf(final double doubleVal) {
// XXX: we should be able to do something smarter here
return valueOf(Double.toString(doubleVal));
}
public static Decimal64 valueOf(final BigDecimal decimalVal) {
// XXX: we should be able to do something smarter here
return valueOf(decimalVal.toPlainString());
}
/**
* Attempt to parse a String into a Decimal64. This method uses minimum fraction digits required to hold
* the entire value.
*
* @param str String to parser
* @return A Decimal64 instance
* @throws NullPointerException if value is null.
* @throws NumberFormatException if the string does not contain a parsable decimal64.
*/
public static Decimal64 valueOf(final String str) {
final Variant variant = SUPPORT.fromString(str);
final Optional value = variant.tryFirst();
if (value.isPresent()) {
return value.get();
}
final Optional message = variant.getSecond().getMessage();
throw message.isPresent() ? new NumberFormatException(message.get()) : new NumberFormatException();
}
public final BigDecimal decimalValue() {
return BigDecimal.valueOf(value, scaleOffset + 1);
}
@Override
public final int intValue() {
return (int) intPart();
}
@Override
public final long longValue() {
return intPart();
}
@Override
public final float floatValue() {
return (float) doubleValue();
}
@Override
public final double doubleValue() {
return 1.0 * value / SCALE[scaleOffset];
}
/**
* Converts this {@code BigDecimal} to a {@code byte}, checking for lost information. If this {@code Decimal64} has
* a nonzero fractional part or is out of the possible range for a {@code byte} result then
* an {@code ArithmeticException} is thrown.
*
* @return this {@code Decimal64} converted to a {@code byte}.
* @throws ArithmeticException if {@code this} has a nonzero fractional part, or will not fit in a {@code byte}.
*/
public final byte byteValueExact() {
final long val = longValueExact();
final byte ret = (byte) val;
if (val != ret) {
throw new ArithmeticException("Value " + val + " is outside of byte range");
}
return ret;
}
/**
* Converts this {@code BigDecimal} to a {@code short}, checking for lost information. If this {@code Decimal64} has
* a nonzero fractional part or is out of the possible range for a {@code short} result then
* an {@code ArithmeticException} is thrown.
*
* @return this {@code Decimal64} converted to a {@code short}.
* @throws ArithmeticException if {@code this} has a nonzero fractional part, or will not fit in a {@code short}.
*/
public final short shortValueExact() {
final long val = longValueExact();
final short ret = (short) val;
if (val != ret) {
throw new ArithmeticException("Value " + val + " is outside of short range");
}
return ret;
}
/**
* Converts this {@code BigDecimal} to an {@code int}, checking for lost information. If this {@code Decimal64} has
* a nonzero fractional part or is out of the possible range for an {@code int} result then
* an {@code ArithmeticException} is thrown.
*
* @return this {@code Decimal64} converted to an {@code int}.
* @throws ArithmeticException if {@code this} has a nonzero fractional part, or will not fit in an {@code int}.
*/
public final int intValueExact() {
final long val = longValueExact();
final int ret = (int) val;
if (val != ret) {
throw new ArithmeticException("Value " + val + " is outside of integer range");
}
return ret;
}
/**
* Converts this {@code BigDecimal} to a {@code long}, checking for lost information. If this {@code Decimal64} has
* a nonzero fractional part then an {@code ArithmeticException} is thrown.
*
* @return this {@code Decimal64} converted to a {@code long}.
* @throws ArithmeticException if {@code this} has a nonzero fractional part.
*/
public final long longValueExact() {
if (fracPart() != 0) {
throw new ArithmeticException("Conversion of " + this + " would lose fraction");
}
return intPart();
}
@Override
@SuppressWarnings("checkstyle:parameterName")
public final int compareTo(final Decimal64 o) {
if (this == o) {
return 0;
}
if (scaleOffset == o.scaleOffset) {
return Long.compare(value, o.value);
}
// XXX: we could do something smarter here
return Double.compare(doubleValue(), o.doubleValue());
}
@Override
public final String toCanonicalString() {
// https://tools.ietf.org/html/rfc6020#section-9.3.2
//
// The canonical form of a positive decimal64 does not include the sign
// "+". The decimal point is required. Leading and trailing zeros are
// prohibited, subject to the rule that there MUST be at least one digit
// before and after the decimal point. The value zero is represented as
// "0.0".
final StringBuilder sb = new StringBuilder(21).append(intPart()).append('.');
final long fracPart = fracPart();
if (fracPart != 0) {
// We may need to zero-pad the fraction part
sb.append(Strings.padStart(Long.toString(fracPart), scaleOffset + 1, '0'));
} else {
sb.append('0');
}
return sb.toString();
}
@Override
public final CanonicalValueSupport support() {
return SUPPORT;
}
@Override
public final int hashCode() {
// We need to normalize the results in order to be consistent with equals()
return Long.hashCode(intPart()) * 31 + Long.hashCode(fracPart());
}
@Override
public final boolean equals(final @Nullable Object obj) {
return this == obj || obj instanceof Decimal64 && equalsImpl((Decimal64) obj);
}
/**
* A slightly faster version of {@link #equals(Object)}.
*
* @param obj Decimal64 object
* @return {@code true} if this object is the same as the obj argument; {@code false} otherwise.
*/
public final boolean equals(final @Nullable Decimal64 obj) {
return this == obj || obj != null && equalsImpl(obj);
}
@Override
public final String toString() {
return toCanonicalString();
}
private boolean equalsImpl(final Decimal64 other) {
return scaleOffset == other.scaleOffset ? value == other.value
// We need to normalize both
: intPart() == other.intPart() && fracPart() == other.fracPart();
}
private long intPart() {
return value / SCALE[scaleOffset];
}
private long fracPart() {
return Math.abs(value % SCALE[scaleOffset]);
}
}
