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The SoftiCAR Platform is a lightweight, Java-based library to create interactive business web applications.
package com.softicar.platform.common.date;
import java.util.Iterator;
/**
* Represents a range of from one {@link DateItem} to another.
*
* @param
* the type of the date item
* @author Oliver Richers
*/
public class DateItemRange> implements Iterable, Comparable> {
/**
* A static factory to simplify construction of a range through type
* inference.
*
* @param first
* the first date item
* @param last
* the last date item
* @return a new date item range from the first to the last item,
* inclusively
*/
public static > DateItemRange make(TT first, TT last) {
return new DateItemRange<>(first, last);
}
/**
* Constructs a new item range.
*
* @param first
* the first date item of this range
* @param last
* the last item of this range
*/
public DateItemRange(T first, T last) {
m_first = first;
m_last = last;
}
/**
* Constructs a new item range.
*
* @param first
* the first date item of this range
* @param size
* number of item in this range
*/
public DateItemRange(T first, int size) {
m_first = first;
m_last = first.getRelative(size - 1);
}
/**
* Returns the first item of this range.
*
* @return the first item
*/
public T getFirst() {
return m_first;
}
/**
* Returns the last item of this range.
*
* @return the last item
*/
public T getLast() {
return m_last;
}
/**
* Returns the item with the specified index.
*
* @param index
* the index staring from 1 for the first item
* @return the item with the specified index
*/
public T get(int index) {
return m_first.getRelative(index - 1);
}
/**
* Returns the size of this range which is the number of items.
*
* @return the size of this range
*/
public int size() {
return m_last.getAbsoluteIndex() - m_first.getAbsoluteIndex() + 1;
}
/**
* Returns true if this range contains the specified item.
*
* @param item
* the item to check
* @return true if this range contains the item
*/
public boolean contains(T item) {
return item.getAbsoluteIndex() >= m_first.getAbsoluteIndex() && item.getAbsoluteIndex() <= m_last.getAbsoluteIndex();
}
/**
* Returns an iterator over this range of items.
*/
@Override
public Iterator iterator() {
return new DateItemIterator<>(m_first, m_last);
}
/**
* This range is less than the other range if its first item is less than
* the other first item, or if both first items are equal and the last item
* is less than the other last item. Otherwise, this range is greater or
* equal to the other range.
*/
@Override
public int compareTo(DateItemRange other) {
int cmp1 = m_first.compareTo(other.m_first);
if (cmp1 < 0) {
return -1;
}
if (cmp1 > 0) {
return 1;
}
int cmp2 = m_last.compareTo(other.m_last);
if (cmp2 < 0) {
return -1;
}
if (cmp2 > 0) {
return 1;
}
return 0;
}
/**
* Returns true of this range equals the other range.
*
* @param other
* the other range
* @return true if both ranges are equal
*/
public boolean equals(DateItemRange other) {
return m_first.equals(other.m_first) && m_last.equals(other.m_last);
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + m_first.hashCode();
result = prime * result + m_last.hashCode();
return result;
}
@Override
public boolean equals(Object object) {
if (object instanceof DateItemRange) {
DateItemRange other = (DateItemRange) object;
return m_first.equals(other.m_first) && m_last.equals(other.m_last);
} else {
return false;
}
}
@Override
public String toString() {
return "(" + m_first + " --> " + m_last + ")";
}
private final T m_first;
private final T m_last;
}