Example usage for com.google.common.collect ImmutableSortedMap comparator

Introduction

In this page you can find the example usage for com.google.common.collect ImmutableSortedMap comparator.

Prototype

Comparator comparator

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Usage

From source file:google.registry.model.common.TimedTransitionProperty.java

/**
 * Converts the provided value map into the equivalent transition map, using transition objects
 * of the given TimedTransition subclass.  The value map must be sorted according to the natural
 * ordering of its DateTime keys, and keys cannot be earlier than START_OF_TIME.
 */// w  ww.  java 2 s .c o m
// NB: The Class<T> parameter could be eliminated by getting the class via reflection, but then
// the callsite cannot infer T, so unless you explicitly call this as .<V, T>fromValueMap() it
// will default to using just TimedTransition<V>, which fails at runtime.
private static <V, T extends TimedTransition<V>> NavigableMap<DateTime, T> makeTransitionMap(
        ImmutableSortedMap<DateTime, V> valueMap, final Class<T> timedTransitionSubclass) {
    checkArgument(Ordering.natural().equals(valueMap.comparator()),
            "Timed transition value map must have transition time keys in chronological order");
    return Maps.transformEntries(valueMap, new Maps.EntryTransformer<DateTime, V, T>() {
        // For each entry in the input value map, make the output map have an entry at the
        // corresponding time that points to a transition containing that time and that value.
        @Override
        public T transformEntry(DateTime transitionTime, V value) {
            checkArgument(!transitionTime.isBefore(START_OF_TIME),
                    "Timed transition times cannot be earlier than START_OF_TIME / Unix Epoch");
            T subclass = TypeUtils.instantiate(timedTransitionSubclass);
            ((TimedTransition<V>) subclass).transitionTime = transitionTime;
            subclass.setValue(value);
            return subclass;
        }
    });
}

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