Example usage for com.google.common.collect Ordering max

Introduction

In this page you can find the example usage for com.google.common.collect Ordering max.

Prototype

public <E extends T> E max(@Nullable E a, @Nullable E b) 

Source Link

Document

Returns the greater of the two values according to this ordering.

Usage

From source file:com.palantir.common.base.BatchingVisitables.java

/**
 * This will return the first maximal element in the visitable. This method
 * takes a default element and will return that if the visitable is empty.
 * If the visitable is non-empty it will return the largest value in the
 * visitable./*from   ww w. j  a v a 2s.com*/
 * <p>
 * A common way to use this would be to pass <code>null</code> as the
 * defaultElement and have the ordering throw on null elements so you know
 * the visitable doesn't have any nulls.
 */
public static <T> T getMax(BatchingVisitable<T> v, final Ordering<? super T> o, @Nullable T defaultElement) {
    final Mutable<T> ret = Mutables.newMutable(defaultElement);
    v.batchAccept(DEFAULT_BATCH_SIZE, AbortingVisitors.batching(new AbortingVisitor<T, RuntimeException>() {
        boolean hasSeenFirst = false;

        @Override
        public boolean visit(T item) throws RuntimeException {
            if (hasSeenFirst) {
                ret.set(o.max(ret.get(), item));
            } else {
                // Call o.max here so it will throw if item is null and this
                // ordering hates on nulls.
                ret.set(o.max(item, item));
                hasSeenFirst = true;
            }
            return true;
        }
    }));
    return ret.get();
}

---

From source file:com.google.gerrit.server.notedb.ChangeBundle.java

private Timestamp getLatestTimestamp() {
    Ordering<Timestamp> o = Ordering.natural().nullsFirst();
    Timestamp ts = null;/*from w w  w . ja  v a2  s .  com*/
    for (ChangeMessage cm : filterChangeMessages()) {
        ts = o.max(ts, cm.getWrittenOn());
    }
    for (PatchSet ps : getPatchSets()) {
        ts = o.max(ts, ps.getCreatedOn());
    }
    for (PatchSetApproval psa : filterPatchSetApprovals().values()) {
        ts = o.max(ts, psa.getGranted());
    }
    for (PatchLineComment plc : filterPatchLineComments().values()) {
        // Ignore draft comments, as they do not show up in the change meta graph.
        if (plc.getStatus() != PatchLineComment.Status.DRAFT) {
            ts = o.max(ts, plc.getWrittenOn());
        }
    }
    return firstNonNull(ts, change.getLastUpdatedOn());
}

---