Example usage for java.util Comparator equals

Introduction

In this page you can find the example usage for java.util Comparator equals.

Prototype

boolean equals(Object obj);

Source Link

Document

Indicates whether some other object is "equal to" this comparator.

Usage

From source file:Main.java

public static <T> boolean isNaturalSortedSet(Iterable<? extends T> it) {
    if (it instanceof SortedSet) {
        SortedSet<? extends T> sortedSet = (SortedSet<? extends T>) it;
        Comparator<?> comparator = sortedSet.comparator();
        return (comparator == null) || comparator.equals(Ordering.natural());
    }/*from   w w  w . j ava2 s.c  o m*/
    return false;
}

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From source file:Main.java

public static <T> boolean isNaturalSortedSet(@Nonnull Iterable<? extends T> it) {
    if (it instanceof SortedSet) {
        SortedSet<? extends T> sortedSet = (SortedSet<? extends T>) it;
        Comparator<?> comparator = sortedSet.comparator();
        return (comparator == null) || comparator.equals(Ordering.natural());
    }/*from w  w w. j  a v a  2  s  .  c om*/
    return false;
}

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From source file:Main.java

@Nonnull
private static <T> SortedSet<? extends T> toSortedSet(@Nonnull Comparator<? super T> elementComparator,
        @Nonnull Collection<? extends T> collection) {
    if (collection instanceof SortedSet) {
        SortedSet<? extends T> sortedSet = (SortedSet<? extends T>) collection;
        Comparator<?> comparator = sortedSet.comparator();
        if (comparator != null && comparator.equals(elementComparator)) {
            return sortedSet;
        }//from   w ww  .  j  a v  a2  s .  co m
    }
    return ImmutableSortedSet.copyOf(elementComparator, collection);
}

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From source file:Main.java

private static <T> SortedSet<? extends T> toSortedSet(Comparator<? super T> elementComparator,
        Collection<? extends T> collection) {
    if (collection instanceof SortedSet) {
        SortedSet<? extends T> sortedSet = (SortedSet<? extends T>) collection;
        Comparator<?> comparator = sortedSet.comparator();
        if (comparator != null && comparator.equals(elementComparator)) {
            return sortedSet;
        }/*w ww.  j av  a2 s  . c  o m*/
    }
    return ImmutableSortedSet.copyOf(elementComparator, collection);
}

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From source file:Main.java

public static <T> boolean isSortedSet(Comparator<? extends T> elementComparator, Iterable<? extends T> it) {
    if (it instanceof SortedSet) {
        SortedSet<? extends T> sortedSet = (SortedSet<? extends T>) it;
        Comparator<?> comparator = sortedSet.comparator();
        if (comparator == null) {
            return elementComparator.equals(Ordering.natural());
        }//from  ww  w  . jav a 2 s.  c om
        return elementComparator.equals(comparator);
    }
    return false;
}

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From source file:Main.java

public static <T> boolean isSortedSet(@Nonnull Comparator<? extends T> elementComparator,
        @Nonnull Iterable<? extends T> it) {
    if (it instanceof SortedSet) {
        SortedSet<? extends T> sortedSet = (SortedSet<? extends T>) it;
        Comparator<?> comparator = sortedSet.comparator();
        if (comparator == null) {
            return elementComparator.equals(Ordering.natural());
        }//from  w  ww .j av  a2 s  .  c om
        return elementComparator.equals(comparator);
    }
    return false;
}

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From source file:Main.java

/**
 * @param a/*from  www.j  a  v a2 s.  co  m*/
 * @param b
 * @return
 */
public static boolean containsSome(Collection a, Collection b) {
    // fast paths
    if (a.size() == 0 || b.size() == 0)
        return false;
    if (a == b)
        return true; // must test after size test.

    if (a instanceof SortedSet && b instanceof SortedSet) {
        SortedSet aa = (SortedSet) a;
        SortedSet bb = (SortedSet) b;
        Comparator bbc = bb.comparator();
        Comparator aac = aa.comparator();
        if (bbc == null && aac == null) {
            Iterator ai = aa.iterator();
            Iterator bi = bb.iterator();
            Comparable ao = (Comparable) ai.next(); // these are ok, since the sizes are != 0
            Comparable bo = (Comparable) bi.next();
            while (true) {
                int rel = ao.compareTo(bo);
                if (rel < 0) {
                    if (!ai.hasNext())
                        return false;
                    ao = (Comparable) ai.next();
                } else if (rel > 0) {
                    if (!bi.hasNext())
                        return false;
                    bo = (Comparable) bi.next();
                } else {
                    return true;
                }
            }
        } else if (bbc.equals(a)) {
            Iterator ai = aa.iterator();
            Iterator bi = bb.iterator();
            Object ao = ai.next(); // these are ok, since the sizes are != 0
            Object bo = bi.next();
            while (true) {
                int rel = aac.compare(ao, bo);
                if (rel < 0) {
                    if (!ai.hasNext())
                        return false;
                    ao = ai.next();
                } else if (rel > 0) {
                    if (!bi.hasNext())
                        return false;
                    bo = bi.next();
                } else {
                    return true;
                }
            }
        }
    }
    for (Iterator it = a.iterator(); it.hasNext();) {
        if (b.contains(it.next()))
            return true;
    }
    return false;
}

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From source file:Main.java

public static boolean containsAll(Collection a, Collection b) {
    // fast paths
    if (a == b)/*  ww  w .  j av  a2 s .  c  o  m*/
        return true;
    if (b.size() == 0)
        return true;
    if (a.size() < b.size())
        return false;

    if (a instanceof SortedSet && b instanceof SortedSet) {
        SortedSet aa = (SortedSet) a;
        SortedSet bb = (SortedSet) b;
        Comparator bbc = bb.comparator();
        Comparator aac = aa.comparator();
        if (bbc == null && aac == null) {
            Iterator ai = aa.iterator();
            Iterator bi = bb.iterator();
            Comparable ao = (Comparable) ai.next(); // these are ok, since the sizes are != 0
            Comparable bo = (Comparable) bi.next();
            while (true) {
                int rel = ao.compareTo(bo);
                if (rel == 0) {
                    if (!bi.hasNext())
                        return true;
                    if (!ai.hasNext())
                        return false;
                    bo = (Comparable) bi.next();
                    ao = (Comparable) ai.next();
                } else if (rel < 0) {
                    if (!ai.hasNext())
                        return false;
                    ao = (Comparable) ai.next();
                } else {
                    return false;
                }
            }
        } else if (bbc.equals(aac)) {
            Iterator ai = aa.iterator();
            Iterator bi = bb.iterator();
            Object ao = ai.next(); // these are ok, since the sizes are != 0
            Object bo = bi.next();
            while (true) {
                int rel = aac.compare(ao, bo);
                if (rel == 0) {
                    if (!bi.hasNext())
                        return true;
                    if (!ai.hasNext())
                        return false;
                    bo = bi.next();
                    ao = ai.next();
                } else if (rel < 0) {
                    if (!ai.hasNext())
                        return false;
                    ao = ai.next();
                } else {
                    return false;
                }
            }
        }
    }
    return a.containsAll(b);
}

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From source file:org.sakaiproject.tool.messageforums.ui.MessageForumStatisticsBean.java

/**
 * Retreives topic statistics while determining whether to retrieve them from the cache or by invoking getTopicStatistics()
 *//*w  w w .  jav  a2s . co  m*/
public List getGradeStatisticsForStatsListByTopic() {
    // Determine if something has changed that warrants the cached gradeStatistics to be refreshed
    // Has the selected gradebook assignment or the selected group changed since the gradeStatistics were cached?
    boolean refreshCachedStatistics = !StringUtils.equals(m_gradeStatisticsAssign, selectedAssign)
            || !StringUtils.equals(m_gradeStatisticsGroup, selectedGroup);
    if (!refreshCachedStatistics) {
        // Are we sorting on a different column?
        Comparator comparator = determineComparator();
        if (comparator != null && !comparator.equals(m_comparator)) {
            refreshCachedStatistics = true;
        }
    }

    if (refreshCachedStatistics) {
        // The selected gradebook assignment or group has changed; our gradeStatistics need to be updated
        getTopicStatistics();
    }
    return gradeStatistics;
}

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