org.joda.time.base.AbstractPartial Maven / Gradle / Ivy
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/*
* Copyright 2001-2011 Stephen Colebourne
*
* 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.joda.time.base;
import org.joda.time.Chronology;
import org.joda.time.DateTime;
import org.joda.time.DateTimeField;
import org.joda.time.DateTimeFieldType;
import org.joda.time.DateTimeUtils;
import org.joda.time.DurationFieldType;
import org.joda.time.ReadableInstant;
import org.joda.time.ReadablePartial;
import org.joda.time.field.FieldUtils;
import org.joda.time.format.DateTimeFormatter;
/**
* AbstractPartial provides a standard base implementation of most methods
* in the ReadablePartial interface.
*
* Calculations on are performed using a {@link Chronology}.
* This chronology is set to be in the UTC time zone for all calculations.
*
* The methods on this class use {@link ReadablePartial#size()},
* {@link AbstractPartial#getField(int, Chronology)} and
* {@link ReadablePartial#getValue(int)} to calculate their results.
* Subclasses may have a better implementation.
*
* AbstractPartial allows subclasses may be mutable and not thread-safe.
*
* @author Stephen Colebourne
* @since 1.0
*/
public abstract class AbstractPartial
implements ReadablePartial, Comparable {
//-----------------------------------------------------------------------
/**
* Constructor.
*/
protected AbstractPartial() {
super();
}
//-----------------------------------------------------------------------
/**
* Gets the field for a specific index in the chronology specified.
*
* This method must not use any instance variables.
*
* @param index the index to retrieve
* @param chrono the chronology to use
* @return the field
* @throws IndexOutOfBoundsException if the index is invalid
*/
protected abstract DateTimeField getField(int index, Chronology chrono);
//-----------------------------------------------------------------------
/**
* Gets the field type at the specified index.
*
* @param index the index
* @return the field type
* @throws IndexOutOfBoundsException if the index is invalid
*/
public DateTimeFieldType getFieldType(int index) {
return getField(index, getChronology()).getType();
}
/**
* Gets an array of the field types that this partial supports.
*
* The fields are returned largest to smallest, for example Hour, Minute, Second.
*
* @return the fields supported in an array that may be altered, largest to smallest
*/
public DateTimeFieldType[] getFieldTypes() {
DateTimeFieldType[] result = new DateTimeFieldType[size()];
for (int i = 0; i < result.length; i++) {
result[i] = getFieldType(i);
}
return result;
}
/**
* Gets the field at the specified index.
*
* @param index the index
* @return the field
* @throws IndexOutOfBoundsException if the index is invalid
*/
public DateTimeField getField(int index) {
return getField(index, getChronology());
}
/**
* Gets an array of the fields that this partial supports.
*
* The fields are returned largest to smallest, for example Hour, Minute, Second.
*
* @return the fields supported in an array that may be altered, largest to smallest
*/
public DateTimeField[] getFields() {
DateTimeField[] result = new DateTimeField[size()];
for (int i = 0; i < result.length; i++) {
result[i] = getField(i);
}
return result;
}
/**
* Gets an array of the value of each of the fields that this partial supports.
*
* The fields are returned largest to smallest, for example Hour, Minute, Second.
* Each value corresponds to the same array index as getFields()
*
* @return the current values of each field in an array that may be altered, largest to smallest
*/
public int[] getValues() {
int[] result = new int[size()];
for (int i = 0; i < result.length; i++) {
result[i] = getValue(i);
}
return result;
}
//-----------------------------------------------------------------------
/**
* Get the value of one of the fields of a datetime.
*
* The field specified must be one of those that is supported by the partial.
*
* @param type a DateTimeFieldType instance that is supported by this partial
* @return the value of that field
* @throws IllegalArgumentException if the field is null or not supported
*/
public int get(DateTimeFieldType type) {
return getValue(indexOfSupported(type));
}
/**
* Checks whether the field specified is supported by this partial.
*
* @param type the type to check, may be null which returns false
* @return true if the field is supported
*/
public boolean isSupported(DateTimeFieldType type) {
return (indexOf(type) != -1);
}
/**
* Gets the index of the specified field, or -1 if the field is unsupported.
*
* @param type the type to check, may be null which returns -1
* @return the index of the field, -1 if unsupported
*/
public int indexOf(DateTimeFieldType type) {
for (int i = 0, isize = size(); i < isize; i++) {
if (getFieldType(i) == type) {
return i;
}
}
return -1;
}
/**
* Gets the index of the specified field, throwing an exception if the
* field is unsupported.
*
* @param type the type to check, not null
* @return the index of the field
* @throws IllegalArgumentException if the field is null or not supported
*/
protected int indexOfSupported(DateTimeFieldType type) {
int index = indexOf(type);
if (index == -1) {
throw new IllegalArgumentException("Field '" + type + "' is not supported");
}
return index;
}
/**
* Gets the index of the first fields to have the specified duration,
* or -1 if the field is unsupported.
*
* @param type the type to check, may be null which returns -1
* @return the index of the field, -1 if unsupported
*/
protected int indexOf(DurationFieldType type) {
for (int i = 0, isize = size(); i < isize; i++) {
if (getFieldType(i).getDurationType() == type) {
return i;
}
}
return -1;
}
/**
* Gets the index of the first fields to have the specified duration,
* throwing an exception if the field is unsupported.
*
* @param type the type to check, not null
* @return the index of the field
* @throws IllegalArgumentException if the field is null or not supported
*/
protected int indexOfSupported(DurationFieldType type) {
int index = indexOf(type);
if (index == -1) {
throw new IllegalArgumentException("Field '" + type + "' is not supported");
}
return index;
}
//-----------------------------------------------------------------------
/**
* Resolves this partial against another complete instant to create a new
* full instant. The combination is performed using the chronology of the
* specified instant.
*
* For example, if this partial represents a time, then the result of this
* method will be the datetime from the specified base instant plus the
* time from this partial.
*
* @param baseInstant the instant that provides the missing fields, null means now
* @return the combined datetime
*/
public DateTime toDateTime(ReadableInstant baseInstant) {
Chronology chrono = DateTimeUtils.getInstantChronology(baseInstant);
long instantMillis = DateTimeUtils.getInstantMillis(baseInstant);
long resolved = chrono.set(this, instantMillis);
return new DateTime(resolved, chrono);
}
//-----------------------------------------------------------------------
/**
* Compares this ReadablePartial with another returning true if the chronology,
* field types and values are equal.
*
* @param partial an object to check against
* @return true if fields and values are equal
*/
public boolean equals(Object partial) {
if (this == partial) {
return true;
}
if (partial instanceof ReadablePartial == false) {
return false;
}
ReadablePartial other = (ReadablePartial) partial;
if (size() != other.size()) {
return false;
}
for (int i = 0, isize = size(); i < isize; i++) {
if (getValue(i) != other.getValue(i) || getFieldType(i) != other.getFieldType(i)) {
return false;
}
}
return FieldUtils.equals(getChronology(), other.getChronology());
}
/**
* Gets a hash code for the ReadablePartial that is compatible with the
* equals method.
*
* @return a suitable hash code
*/
public int hashCode() {
int total = 157;
for (int i = 0, isize = size(); i < isize; i++) {
total = 23 * total + getValue(i);
total = 23 * total + getFieldType(i).hashCode();
}
total += getChronology().hashCode();
return total;
}
//-----------------------------------------------------------------------
/**
* Compares this partial with another returning an integer
* indicating the order.
*
* The fields are compared in order, from largest to smallest.
* The first field that is non-equal is used to determine the result.
*
* The specified object must be a partial instance whose field types
* match those of this partial.
*
* NOTE: Prior to v2.0, the {@code Comparable} interface was only implemented
* in this class and not in the {@code ReadablePartial} interface.
*
* @param other an object to check against
* @return negative if this is less, zero if equal, positive if greater
* @throws ClassCastException if the partial is the wrong class
* or if it has field types that don't match
* @throws NullPointerException if the partial is null
* @since 1.1
*/
public int compareTo(ReadablePartial other) {
if (this == other) {
return 0;
}
if (size() != other.size()) {
throw new ClassCastException("ReadablePartial objects must have matching field types");
}
for (int i = 0, isize = size(); i < isize; i++) {
if (getFieldType(i) != other.getFieldType(i)) {
throw new ClassCastException("ReadablePartial objects must have matching field types");
}
}
// fields are ordered largest first
for (int i = 0, isize = size(); i < isize; i++) {
if (getValue(i) > other.getValue(i)) {
return 1;
}
if (getValue(i) < other.getValue(i)) {
return -1;
}
}
return 0;
}
/**
* Is this partial later than the specified partial.
*
* The fields are compared in order, from largest to smallest.
* The first field that is non-equal is used to determine the result.
*
* You may not pass null into this method. This is because you need
* a time zone to accurately determine the current date.
*
* @param partial a partial to check against, must not be null
* @return true if this date is strictly after the date passed in
* @throws IllegalArgumentException if the specified partial is null
* @throws ClassCastException if the partial has field types that don't match
* @since 1.1
*/
public boolean isAfter(ReadablePartial partial) {
if (partial == null) {
throw new IllegalArgumentException("Partial cannot be null");
}
return compareTo(partial) > 0;
}
/**
* Is this partial earlier than the specified partial.
*
* The fields are compared in order, from largest to smallest.
* The first field that is non-equal is used to determine the result.
*
* You may not pass null into this method. This is because you need
* a time zone to accurately determine the current date.
*
* @param partial a partial to check against, must not be null
* @return true if this date is strictly before the date passed in
* @throws IllegalArgumentException if the specified partial is null
* @throws ClassCastException if the partial has field types that don't match
* @since 1.1
*/
public boolean isBefore(ReadablePartial partial) {
if (partial == null) {
throw new IllegalArgumentException("Partial cannot be null");
}
return compareTo(partial) < 0;
}
/**
* Is this partial the same as the specified partial.
*
* The fields are compared in order, from largest to smallest.
* If all fields are equal, the result is true.
*
* You may not pass null into this method. This is because you need
* a time zone to accurately determine the current date.
*
* @param partial a partial to check against, must not be null
* @return true if this date is the same as the date passed in
* @throws IllegalArgumentException if the specified partial is null
* @throws ClassCastException if the partial has field types that don't match
* @since 1.1
*/
public boolean isEqual(ReadablePartial partial) {
if (partial == null) {
throw new IllegalArgumentException("Partial cannot be null");
}
return compareTo(partial) == 0;
}
//-----------------------------------------------------------------------
/**
* Uses the specified formatter to convert this partial to a String.
*
* @param formatter the formatter to use, null means use toString().
* @return the formatted string
* @since 1.1
*/
public String toString(DateTimeFormatter formatter) {
if (formatter == null) {
return toString();
}
return formatter.print(this);
}
}