author | sherman |
Thu, 14 Aug 2014 15:54:04 -0700 | |
changeset 25986 | 12bcf9a5994f |
parent 22566 | 4ebe53dd7814 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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||
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/* |
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* This file is available under and governed by the GNU General Public |
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* License version 2 only, as published by the Free Software Foundation. |
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* However, the following notice accompanied the original version of this |
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* file: |
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* |
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* Copyright (c) 2011-2012, Stephen Colebourne & Michael Nascimento Santos |
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* |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions are met: |
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* |
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* * Redistributions of source code must retain the above copyright notice, |
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* this list of conditions and the following disclaimer. |
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* |
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* * Redistributions in binary form must reproduce the above copyright notice, |
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* this list of conditions and the following disclaimer in the documentation |
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* and/or other materials provided with the distribution. |
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* |
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* * Neither the name of JSR-310 nor the names of its contributors |
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* may be used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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package java.time.temporal; |
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import java.io.IOException; |
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import java.io.InvalidObjectException; |
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import java.io.ObjectInputStream; |
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import java.io.Serializable; |
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import java.time.DateTimeException; |
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/** |
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* The range of valid values for a date-time field. |
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* <p> |
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* All {@link TemporalField} instances have a valid range of values. |
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* For example, the ISO day-of-month runs from 1 to somewhere between 28 and 31. |
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* This class captures that valid range. |
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* <p> |
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* It is important to be aware of the limitations of this class. |
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* Only the minimum and maximum values are provided. |
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* It is possible for there to be invalid values within the outer range. |
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* For example, a weird field may have valid values of 1, 2, 4, 6, 7, thus |
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* have a range of '1 - 7', despite that fact that values 3 and 5 are invalid. |
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* <p> |
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* Instances of this class are not tied to a specific field. |
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* |
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* @implSpec |
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* This class is immutable and thread-safe. |
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* |
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* @since 1.8 |
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*/ |
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public final class ValueRange implements Serializable { |
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/** |
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* Serialization version. |
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*/ |
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private static final long serialVersionUID = -7317881728594519368L; |
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/** |
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* The smallest minimum value. |
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*/ |
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private final long minSmallest; |
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/** |
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* The largest minimum value. |
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*/ |
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private final long minLargest; |
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/** |
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* The smallest maximum value. |
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*/ |
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private final long maxSmallest; |
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/** |
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* The largest maximum value. |
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*/ |
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private final long maxLargest; |
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/** |
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* Obtains a fixed value range. |
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* <p> |
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* This factory obtains a range where the minimum and maximum values are fixed. |
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* For example, the ISO month-of-year always runs from 1 to 12. |
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* |
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* @param min the minimum value |
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* @param max the maximum value |
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* @return the ValueRange for min, max, not null |
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* @throws IllegalArgumentException if the minimum is greater than the maximum |
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*/ |
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public static ValueRange of(long min, long max) { |
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if (min > max) { |
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throw new IllegalArgumentException("Minimum value must be less than maximum value"); |
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} |
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return new ValueRange(min, min, max, max); |
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} |
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/** |
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* Obtains a variable value range. |
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* <p> |
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* This factory obtains a range where the minimum value is fixed and the maximum value may vary. |
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* For example, the ISO day-of-month always starts at 1, but ends between 28 and 31. |
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* |
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* @param min the minimum value |
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* @param maxSmallest the smallest maximum value |
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* @param maxLargest the largest maximum value |
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* @return the ValueRange for min, smallest max, largest max, not null |
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* @throws IllegalArgumentException if |
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* the minimum is greater than the smallest maximum, |
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* or the smallest maximum is greater than the largest maximum |
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*/ |
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public static ValueRange of(long min, long maxSmallest, long maxLargest) { |
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return of(min, min, maxSmallest, maxLargest); |
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} |
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/** |
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* Obtains a fully variable value range. |
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* <p> |
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* This factory obtains a range where both the minimum and maximum value may vary. |
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* |
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* @param minSmallest the smallest minimum value |
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* @param minLargest the largest minimum value |
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* @param maxSmallest the smallest maximum value |
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* @param maxLargest the largest maximum value |
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* @return the ValueRange for smallest min, largest min, smallest max, largest max, not null |
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* @throws IllegalArgumentException if |
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* the smallest minimum is greater than the smallest maximum, |
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* or the smallest maximum is greater than the largest maximum |
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* or the largest minimum is greater than the largest maximum |
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*/ |
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public static ValueRange of(long minSmallest, long minLargest, long maxSmallest, long maxLargest) { |
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if (minSmallest > minLargest) { |
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throw new IllegalArgumentException("Smallest minimum value must be less than largest minimum value"); |
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} |
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if (maxSmallest > maxLargest) { |
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throw new IllegalArgumentException("Smallest maximum value must be less than largest maximum value"); |
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} |
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if (minLargest > maxLargest) { |
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throw new IllegalArgumentException("Minimum value must be less than maximum value"); |
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} |
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return new ValueRange(minSmallest, minLargest, maxSmallest, maxLargest); |
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} |
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/** |
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* Restrictive constructor. |
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* |
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* @param minSmallest the smallest minimum value |
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* @param minLargest the largest minimum value |
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* @param maxSmallest the smallest minimum value |
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* @param maxLargest the largest minimum value |
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*/ |
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private ValueRange(long minSmallest, long minLargest, long maxSmallest, long maxLargest) { |
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this.minSmallest = minSmallest; |
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this.minLargest = minLargest; |
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this.maxSmallest = maxSmallest; |
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this.maxLargest = maxLargest; |
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} |
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//----------------------------------------------------------------------- |
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/** |
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* Is the value range fixed and fully known. |
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* <p> |
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* For example, the ISO day-of-month runs from 1 to between 28 and 31. |
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* Since there is uncertainty about the maximum value, the range is not fixed. |
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* However, for the month of January, the range is always 1 to 31, thus it is fixed. |
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* |
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* @return true if the set of values is fixed |
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*/ |
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public boolean isFixed() { |
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return minSmallest == minLargest && maxSmallest == maxLargest; |
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} |
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//----------------------------------------------------------------------- |
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/** |
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* Gets the minimum value that the field can take. |
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* <p> |
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* For example, the ISO day-of-month always starts at 1. |
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* The minimum is therefore 1. |
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* |
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* @return the minimum value for this field |
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*/ |
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public long getMinimum() { |
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return minSmallest; |
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} |
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/** |
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* Gets the largest possible minimum value that the field can take. |
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* <p> |
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* For example, the ISO day-of-month always starts at 1. |
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* The largest minimum is therefore 1. |
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* |
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* @return the largest possible minimum value for this field |
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*/ |
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public long getLargestMinimum() { |
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return minLargest; |
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} |
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/** |
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* Gets the smallest possible maximum value that the field can take. |
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* <p> |
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* For example, the ISO day-of-month runs to between 28 and 31 days. |
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* The smallest maximum is therefore 28. |
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* |
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* @return the smallest possible maximum value for this field |
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*/ |
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public long getSmallestMaximum() { |
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return maxSmallest; |
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} |
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/** |
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* Gets the maximum value that the field can take. |
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* <p> |
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* For example, the ISO day-of-month runs to between 28 and 31 days. |
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* The maximum is therefore 31. |
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* |
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* @return the maximum value for this field |
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*/ |
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public long getMaximum() { |
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return maxLargest; |
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} |
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//----------------------------------------------------------------------- |
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/** |
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* Checks if all values in the range fit in an {@code int}. |
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* <p> |
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* This checks that all valid values are within the bounds of an {@code int}. |
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* <p> |
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* For example, the ISO month-of-year has values from 1 to 12, which fits in an {@code int}. |
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* By comparison, ISO nano-of-day runs from 1 to 86,400,000,000,000 which does not fit in an {@code int}. |
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* <p> |
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* This implementation uses {@link #getMinimum()} and {@link #getMaximum()}. |
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* |
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* @return true if a valid value always fits in an {@code int} |
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*/ |
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public boolean isIntValue() { |
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return getMinimum() >= Integer.MIN_VALUE && getMaximum() <= Integer.MAX_VALUE; |
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} |
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/** |
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* Checks if the value is within the valid range. |
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* <p> |
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* This checks that the value is within the stored range of values. |
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* |
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* @param value the value to check |
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* @return true if the value is valid |
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*/ |
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public boolean isValidValue(long value) { |
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return (value >= getMinimum() && value <= getMaximum()); |
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} |
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/** |
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* Checks if the value is within the valid range and that all values |
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* in the range fit in an {@code int}. |
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* <p> |
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* This method combines {@link #isIntValue()} and {@link #isValidValue(long)}. |
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* |
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* @param value the value to check |
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* @return true if the value is valid and fits in an {@code int} |
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*/ |
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public boolean isValidIntValue(long value) { |
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return isIntValue() && isValidValue(value); |
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} |
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/** |
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* Checks that the specified value is valid. |
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* <p> |
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* This validates that the value is within the valid range of values. |
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* The field is only used to improve the error message. |
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* |
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* @param value the value to check |
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* @param field the field being checked, may be null |
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* @return the value that was passed in |
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* @see #isValidValue(long) |
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*/ |
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public long checkValidValue(long value, TemporalField field) { |
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if (isValidValue(value) == false) { |
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throw new DateTimeException(genInvalidFieldMessage(field, value)); |
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} |
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return value; |
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} |
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||
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/** |
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* Checks that the specified value is valid and fits in an {@code int}. |
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* <p> |
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* This validates that the value is within the valid range of values and that |
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* all valid values are within the bounds of an {@code int}. |
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* The field is only used to improve the error message. |
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* |
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* @param value the value to check |
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* @param field the field being checked, may be null |
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* @return the value that was passed in |
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* @see #isValidIntValue(long) |
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*/ |
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public int checkValidIntValue(long value, TemporalField field) { |
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if (isValidIntValue(value) == false) { |
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throw new DateTimeException(genInvalidFieldMessage(field, value)); |
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} |
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return (int) value; |
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} |
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private String genInvalidFieldMessage(TemporalField field, long value) { |
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if (field != null) { |
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19030 | 337 |
return "Invalid value for " + field + " (valid values " + this + "): " + value; |
16852 | 338 |
} else { |
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return "Invalid value (valid values " + this + "): " + value; |
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} |
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} |
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//----------------------------------------------------------------------- |
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/** |
22081 | 345 |
* Restore the state of an ValueRange from the stream. |
346 |
* Check that the values are valid. |
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* |
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* @param s the stream to read |
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22081 | 349 |
* @throws InvalidObjectException if |
350 |
* the smallest minimum is greater than the smallest maximum, |
|
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* or the smallest maximum is greater than the largest maximum |
|
352 |
* or the largest minimum is greater than the largest maximum |
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22566 | 353 |
* @throws ClassNotFoundException if a class cannot be resolved |
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*/ |
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private void readObject(ObjectInputStream s) |
356 |
throws IOException, ClassNotFoundException, InvalidObjectException |
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{ |
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s.defaultReadObject(); |
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if (minSmallest > minLargest) { |
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throw new InvalidObjectException("Smallest minimum value must be less than largest minimum value"); |
|
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} |
|
362 |
if (maxSmallest > maxLargest) { |
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363 |
throw new InvalidObjectException("Smallest maximum value must be less than largest maximum value"); |
|
364 |
} |
|
365 |
if (minLargest > maxLargest) { |
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366 |
throw new InvalidObjectException("Minimum value must be less than maximum value"); |
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} |
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} |
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//----------------------------------------------------------------------- |
371 |
/** |
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372 |
* Checks if this range is equal to another range. |
|
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* <p> |
|
374 |
* The comparison is based on the four values, minimum, largest minimum, |
|
375 |
* smallest maximum and maximum. |
|
376 |
* Only objects of type {@code ValueRange} are compared, other types return false. |
|
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* |
|
378 |
* @param obj the object to check, null returns false |
|
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* @return true if this is equal to the other range |
|
380 |
*/ |
|
381 |
@Override |
|
382 |
public boolean equals(Object obj) { |
|
383 |
if (obj == this) { |
|
384 |
return true; |
|
385 |
} |
|
386 |
if (obj instanceof ValueRange) { |
|
387 |
ValueRange other = (ValueRange) obj; |
|
388 |
return minSmallest == other.minSmallest && minLargest == other.minLargest && |
|
389 |
maxSmallest == other.maxSmallest && maxLargest == other.maxLargest; |
|
390 |
} |
|
391 |
return false; |
|
392 |
} |
|
393 |
||
394 |
/** |
|
395 |
* A hash code for this range. |
|
396 |
* |
|
397 |
* @return a suitable hash code |
|
398 |
*/ |
|
399 |
@Override |
|
400 |
public int hashCode() { |
|
401 |
long hash = minSmallest + minLargest << 16 + minLargest >> 48 + maxSmallest << 32 + |
|
402 |
maxSmallest >> 32 + maxLargest << 48 + maxLargest >> 16; |
|
403 |
return (int) (hash ^ (hash >>> 32)); |
|
404 |
} |
|
405 |
||
406 |
//----------------------------------------------------------------------- |
|
407 |
/** |
|
408 |
* Outputs this range as a {@code String}. |
|
409 |
* <p> |
|
410 |
* The format will be '{min}/{largestMin} - {smallestMax}/{max}', |
|
411 |
* where the largestMin or smallestMax sections may be omitted, together |
|
412 |
* with associated slash, if they are the same as the min or max. |
|
413 |
* |
|
414 |
* @return a string representation of this range, not null |
|
415 |
*/ |
|
416 |
@Override |
|
417 |
public String toString() { |
|
418 |
StringBuilder buf = new StringBuilder(); |
|
419 |
buf.append(minSmallest); |
|
420 |
if (minSmallest != minLargest) { |
|
421 |
buf.append('/').append(minLargest); |
|
422 |
} |
|
423 |
buf.append(" - ").append(maxSmallest); |
|
424 |
if (maxSmallest != maxLargest) { |
|
425 |
buf.append('/').append(maxLargest); |
|
426 |
} |
|
427 |
return buf.toString(); |
|
428 |
} |
|
429 |
||
430 |
} |