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/*
* This file is available under and governed by the GNU General Public
* License version 2 only, as published by the Free Software Foundation.
* However, the following notice accompanied the original version of this
* file:
*
* Copyright (c) 2011-2012, Stephen Colebourne & Michael Nascimento Santos
*
* All rights reserved.
*
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package java.time.temporal;
import java.io.IOException;
import java.io.InvalidObjectException;
import java.io.ObjectInputStream;
import java.io.Serializable;
import java.time.DateTimeException;
/**
* The range of valid values for a date-time field.
* <p>
* All {@link TemporalField} instances have a valid range of values.
* For example, the ISO day-of-month runs from 1 to somewhere between 28 and 31.
* This class captures that valid range.
* <p>
* It is important to be aware of the limitations of this class.
* Only the minimum and maximum values are provided.
* It is possible for there to be invalid values within the outer range.
* For example, a weird field may have valid values of 1, 2, 4, 6, 7, thus
* have a range of '1 - 7', despite that fact that values 3 and 5 are invalid.
* <p>
* Instances of this class are not tied to a specific field.
*
* @implSpec
* This class is immutable and thread-safe.
*
* @since 1.8
*/
public final class ValueRange implements Serializable {
/**
* Serialization version.
*/
private static final long serialVersionUID = -7317881728594519368L;
/**
* The smallest minimum value.
*/
private final long minSmallest;
/**
* The largest minimum value.
*/
private final long minLargest;
/**
* The smallest maximum value.
*/
private final long maxSmallest;
/**
* The largest maximum value.
*/
private final long maxLargest;
/**
* Obtains a fixed value range.
* <p>
* This factory obtains a range where the minimum and maximum values are fixed.
* For example, the ISO month-of-year always runs from 1 to 12.
*
* @param min the minimum value
* @param max the maximum value
* @return the ValueRange for min, max, not null
* @throws IllegalArgumentException if the minimum is greater than the maximum
*/
public static ValueRange of(long min, long max) {
if (min > max) {
throw new IllegalArgumentException("Minimum value must be less than maximum value");
}
return new ValueRange(min, min, max, max);
}
/**
* Obtains a variable value range.
* <p>
* This factory obtains a range where the minimum value is fixed and the maximum value may vary.
* For example, the ISO day-of-month always starts at 1, but ends between 28 and 31.
*
* @param min the minimum value
* @param maxSmallest the smallest maximum value
* @param maxLargest the largest maximum value
* @return the ValueRange for min, smallest max, largest max, not null
* @throws IllegalArgumentException if
* the minimum is greater than the smallest maximum,
* or the smallest maximum is greater than the largest maximum
*/
public static ValueRange of(long min, long maxSmallest, long maxLargest) {
return of(min, min, maxSmallest, maxLargest);
}
/**
* Obtains a fully variable value range.
* <p>
* This factory obtains a range where both the minimum and maximum value may vary.
*
* @param minSmallest the smallest minimum value
* @param minLargest the largest minimum value
* @param maxSmallest the smallest maximum value
* @param maxLargest the largest maximum value
* @return the ValueRange for smallest min, largest min, smallest max, largest max, not null
* @throws IllegalArgumentException if
* the smallest minimum is greater than the smallest maximum,
* or the smallest maximum is greater than the largest maximum
* or the largest minimum is greater than the largest maximum
*/
public static ValueRange of(long minSmallest, long minLargest, long maxSmallest, long maxLargest) {
if (minSmallest > minLargest) {
throw new IllegalArgumentException("Smallest minimum value must be less than largest minimum value");
}
if (maxSmallest > maxLargest) {
throw new IllegalArgumentException("Smallest maximum value must be less than largest maximum value");
}
if (minLargest > maxLargest) {
throw new IllegalArgumentException("Minimum value must be less than maximum value");
}
return new ValueRange(minSmallest, minLargest, maxSmallest, maxLargest);
}
/**
* Restrictive constructor.
*
* @param minSmallest the smallest minimum value
* @param minLargest the largest minimum value
* @param maxSmallest the smallest minimum value
* @param maxLargest the largest minimum value
*/
private ValueRange(long minSmallest, long minLargest, long maxSmallest, long maxLargest) {
this.minSmallest = minSmallest;
this.minLargest = minLargest;
this.maxSmallest = maxSmallest;
this.maxLargest = maxLargest;
}
//-----------------------------------------------------------------------
/**
* Is the value range fixed and fully known.
* <p>
* For example, the ISO day-of-month runs from 1 to between 28 and 31.
* Since there is uncertainty about the maximum value, the range is not fixed.
* However, for the month of January, the range is always 1 to 31, thus it is fixed.
*
* @return true if the set of values is fixed
*/
public boolean isFixed() {
return minSmallest == minLargest && maxSmallest == maxLargest;
}
//-----------------------------------------------------------------------
/**
* Gets the minimum value that the field can take.
* <p>
* For example, the ISO day-of-month always starts at 1.
* The minimum is therefore 1.
*
* @return the minimum value for this field
*/
public long getMinimum() {
return minSmallest;
}
/**
* Gets the largest possible minimum value that the field can take.
* <p>
* For example, the ISO day-of-month always starts at 1.
* The largest minimum is therefore 1.
*
* @return the largest possible minimum value for this field
*/
public long getLargestMinimum() {
return minLargest;
}
/**
* Gets the smallest possible maximum value that the field can take.
* <p>
* For example, the ISO day-of-month runs to between 28 and 31 days.
* The smallest maximum is therefore 28.
*
* @return the smallest possible maximum value for this field
*/
public long getSmallestMaximum() {
return maxSmallest;
}
/**
* Gets the maximum value that the field can take.
* <p>
* For example, the ISO day-of-month runs to between 28 and 31 days.
* The maximum is therefore 31.
*
* @return the maximum value for this field
*/
public long getMaximum() {
return maxLargest;
}
//-----------------------------------------------------------------------
/**
* Checks if all values in the range fit in an {@code int}.
* <p>
* This checks that all valid values are within the bounds of an {@code int}.
* <p>
* For example, the ISO month-of-year has values from 1 to 12, which fits in an {@code int}.
* By comparison, ISO nano-of-day runs from 1 to 86,400,000,000,000 which does not fit in an {@code int}.
* <p>
* This implementation uses {@link #getMinimum()} and {@link #getMaximum()}.
*
* @return true if a valid value always fits in an {@code int}
*/
public boolean isIntValue() {
return getMinimum() >= Integer.MIN_VALUE && getMaximum() <= Integer.MAX_VALUE;
}
/**
* Checks if the value is within the valid range.
* <p>
* This checks that the value is within the stored range of values.
*
* @param value the value to check
* @return true if the value is valid
*/
public boolean isValidValue(long value) {
return (value >= getMinimum() && value <= getMaximum());
}
/**
* Checks if the value is within the valid range and that all values
* in the range fit in an {@code int}.
* <p>
* This method combines {@link #isIntValue()} and {@link #isValidValue(long)}.
*
* @param value the value to check
* @return true if the value is valid and fits in an {@code int}
*/
public boolean isValidIntValue(long value) {
return isIntValue() && isValidValue(value);
}
/**
* Checks that the specified value is valid.
* <p>
* This validates that the value is within the valid range of values.
* The field is only used to improve the error message.
*
* @param value the value to check
* @param field the field being checked, may be null
* @return the value that was passed in
* @see #isValidValue(long)
*/
public long checkValidValue(long value, TemporalField field) {
if (isValidValue(value) == false) {
throw new DateTimeException(genInvalidFieldMessage(field, value));
}
return value;
}
/**
* Checks that the specified value is valid and fits in an {@code int}.
* <p>
* This validates that the value is within the valid range of values and that
* all valid values are within the bounds of an {@code int}.
* The field is only used to improve the error message.
*
* @param value the value to check
* @param field the field being checked, may be null
* @return the value that was passed in
* @see #isValidIntValue(long)
*/
public int checkValidIntValue(long value, TemporalField field) {
if (isValidIntValue(value) == false) {
throw new DateTimeException(genInvalidFieldMessage(field, value));
}
return (int) value;
}
private String genInvalidFieldMessage(TemporalField field, long value) {
if (field != null) {
return "Invalid value for " + field + " (valid values " + this + "): " + value;
} else {
return "Invalid value (valid values " + this + "): " + value;
}
}
//-----------------------------------------------------------------------
/**
* Restore the state of an ValueRange from the stream.
* Check that the values are valid.
*
* @param s the stream to read
* @throws InvalidObjectException if
* the smallest minimum is greater than the smallest maximum,
* or the smallest maximum is greater than the largest maximum
* or the largest minimum is greater than the largest maximum
* @throws ClassNotFoundException if a class cannot be resolved
*/
private void readObject(ObjectInputStream s)
throws IOException, ClassNotFoundException, InvalidObjectException
{
s.defaultReadObject();
if (minSmallest > minLargest) {
throw new InvalidObjectException("Smallest minimum value must be less than largest minimum value");
}
if (maxSmallest > maxLargest) {
throw new InvalidObjectException("Smallest maximum value must be less than largest maximum value");
}
if (minLargest > maxLargest) {
throw new InvalidObjectException("Minimum value must be less than maximum value");
}
}
//-----------------------------------------------------------------------
/**
* Checks if this range is equal to another range.
* <p>
* The comparison is based on the four values, minimum, largest minimum,
* smallest maximum and maximum.
* Only objects of type {@code ValueRange} are compared, other types return false.
*
* @param obj the object to check, null returns false
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