Example usage for org.apache.commons.functor BinaryFunction BinaryFunction

Introduction

In this page you can find the example usage for org.apache.commons.functor BinaryFunction BinaryFunction.

Prototype

BinaryFunction

Source Link

Usage

From source file:org.apache.commons.functor.example.map.FixedSizeMap.java

public FixedSizeMap(Map<K, V> map) {
    super(map);//from  w  w w. ja v  a 2  s .c  o m
    setOnPut(new BinaryFunction<Map<K, V>, Object[], V>() {
        public V evaluate(Map<K, V> map, Object[] b) {
            K key = (K) Array.get(b, 0);
            V value = (V) Array.get(b, 1);
            if (map.containsKey(key)) {
                return map.put(key, value);
            } else {
                throw new IllegalArgumentException();
            }
        }
    });

    setOnPutAll(new BinaryProcedure<Map<K, V>, Map<K, V>>() {
        public void run(Map<K, V> a, Map<K, V> b) {
            Map<K, V> dest = a;
            Map<K, V> src = b;

            if (GeneratorContains.instance().test(IteratorToGeneratorAdapter.adapt(src.keySet().iterator()),
                    Not.not(new ContainsKey(dest)))) {
                throw new IllegalArgumentException();
            } else {
                dest.putAll(src);
            }
        }
    });

    setOnRemove(new BinaryProcedureBinaryFunction<Map<K, V>, K, V>(
            (BinaryProcedure<? super Map<K, V>, ? super K>) new Throw<K, V>(
                    new UnsupportedOperationException())));
    setOnClear(new Throw<K, V>(new UnsupportedOperationException()));
}

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From source file:org.apache.commons.functor.example.map.LazyMap.java

public LazyMap(Map<K, V> map, final Function<K, V> factory) {
    super(map);//from  w  ww  .ja v a 2s.  co  m
    setOnGet(new BinaryFunction<Map<K, V>, K, V>() {
        public V evaluate(Map<K, V> map, K key) {
            if (map.containsKey(key)) {
                return map.get(key);
            } else {
                V value = factory.evaluate(key);
                map.put(key, value);
                return value;
            }
        }
    });
}

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