Java IntToDoubleFunction类代码示例

import java.util.function.IntToDoubleFunction; //导入依赖的package包/类
public Spell(String name, int manaCost, int maxLevel, int row, int col, String descriptionFormat, IntToDoubleFunction[] functions, Object[] requirements, SpellEffect spellEffect) {
    this.name = name;
    this.manaCost = manaCost;
    this.maxLevel = maxLevel;
    this.row = row;
    this.col = col;
    this.descriptionFormat = descriptionFormat;
    this.functions = functions;
    this.requirements = new HashMap<Spell, Integer>();
    if (requirements != null) {
        for (int k = 0; k < requirements.length; k += 2) {
            this.requirements.put((Spell) requirements[k], (int) requirements[k + 1]);
        }
    }
    this.spellEffect = spellEffect;
    this.spellEffect.functions = functions;
}
 

import java.util.function.IntToDoubleFunction; //导入依赖的package包/类
@Override
public final DoubleStream mapToDouble(IntToDoubleFunction mapper) {
    Objects.requireNonNull(mapper);
    return new DoublePipeline.StatelessOp<Integer>(this, StreamShape.INT_VALUE,
                                                   StreamOpFlag.NOT_SORTED | StreamOpFlag.NOT_DISTINCT) {
        @Override
        Sink<Integer> opWrapSink(int flags, Sink<Double> sink) {
            return new Sink.ChainedInt<Double>(sink) {
                @Override
                public void accept(int t) {
                    downstream.accept(mapper.applyAsDouble(t));
                }
            };
        }
    };
}
 

import java.util.function.IntToDoubleFunction; //导入依赖的package包/类
/** {@inheritDoc} */
@Override public Vector assign(IntToDoubleFunction fun) {
    assert fun != null;

    if (sto.isArrayBased()) {
        ensureReadOnly();

        Arrays.setAll(sto.data(), fun);
    }
    else {
        int len = size();

        for (int i = 0; i < len; i++)
            storageSet(i, fun.applyAsDouble(i));
    }

    return this;
}
 

import java.util.function.IntToDoubleFunction; //导入依赖的package包/类
/**
*
*/
@Test
@SuppressWarnings(CompilerWarnings.UNUSED)
public void shouldRequireNonNullCache() {
    // given
    final ConcurrentMap<Integer, Double> cache = null;
    final IntToDoubleFunction function = input -> 123;
    final IntFunction<Integer> keyFunction = Integer::valueOf;

    // when
    thrown.expect(NullPointerException.class);
    thrown.expectMessage("Provide an empty map instead of NULL.");

    // then
    new ConcurrentMapBasedIntToDoubleFunctionMemoizer<>(cache, keyFunction, function);
}
 

import java.util.function.IntToDoubleFunction; //导入依赖的package包/类
/**
*
*/
@Test
@SuppressWarnings(CompilerWarnings.UNUSED)
public void shouldRequireNonNullFunction() {
    // given
    final ConcurrentMap<Integer, Double> cache = new ConcurrentHashMap<>();
    final IntToDoubleFunction function = null;
    final IntFunction<Integer> keyFunction = Integer::valueOf;

    // when
    thrown.expect(NullPointerException.class);
    thrown.expectMessage(
            "Cannot memoize a NULL IntToDoubleFunction - provide an actual IntToDoubleFunction to fix this.");

    // then
    new ConcurrentMapBasedIntToDoubleFunctionMemoizer<>(cache, keyFunction, function);
}
 

import java.util.function.IntToDoubleFunction; //导入依赖的package包/类
/**
*
*/
@Test
public void shouldUseSetCacheKeyAndValue() {
    // given
    final ConcurrentMap<Integer, Double> cache = new ConcurrentHashMap<>();
    final IntToDoubleFunction function = input -> 123;
    final IntFunction<Integer> keyFunction = Integer::valueOf;

    // when
    final ConcurrentMapBasedIntToDoubleFunctionMemoizer<Integer> memoizer = new ConcurrentMapBasedIntToDoubleFunctionMemoizer<>(
            cache, keyFunction, function);

    // then
    memoizer.applyAsDouble(123);
    Assert.assertFalse("Cache is still empty after memoization", memoizer.viewCacheForTest().isEmpty());
    Assert.assertEquals("Memoization key does not match expectations", 123,
            memoizer.viewCacheForTest().keySet().iterator().next().intValue());
    Assert.assertEquals("Memoization value does not match expectations", 123D,
            memoizer.viewCacheForTest().values().iterator().next().doubleValue(), 0.0D);
}
 

import java.util.function.IntToDoubleFunction; //导入依赖的package包/类
/**
*
*/
@Test
public void shouldUseCallWrappedFunction() {
    // given
    final ConcurrentMap<Integer, Double> cache = new ConcurrentHashMap<>();
    final IntToDoubleFunction function = Mockito.mock(IntToDoubleFunction.class);
    final IntFunction<Integer> keyFunction = Integer::valueOf;

    // when
    final ConcurrentMapBasedIntToDoubleFunctionMemoizer<Integer> memoizer = new ConcurrentMapBasedIntToDoubleFunctionMemoizer<>(
            cache, keyFunction, function);

    // then
    memoizer.applyAsDouble(123);
    Mockito.verify(function).applyAsDouble(123);
}
 

import java.util.function.IntToDoubleFunction; //导入依赖的package包/类
/**
 * Create an input device from the supplied mapping functions.
 * @param axisToValue the function that maps an integer to a double value for the axis
 * @param buttonNumberToSwitch the function that maps an integer to whether the button is pressed
 * @param padToValue the function that maps an integer to the directional axis output
 * @return the resulting input device; never null
 */
public static InputDevice create( IntToDoubleFunction axisToValue, IntToBooleanFunction buttonNumberToSwitch, IntToIntFunction padToValue ) {
    return new InputDevice() {
        @Override
        public ContinuousRange getAxis(int axis) {
            return ()->axisToValue.applyAsDouble(axis);
        }
        @Override
        public Switch getButton(int button) {
            return ()->buttonNumberToSwitch.applyAsBoolean(button);
        }
        @Override
        public DirectionalAxis getDPad(int pad) {
            return ()->padToValue.applyAsInt(pad);
        }
    };
}
 

import java.util.function.IntToDoubleFunction; //导入依赖的package包/类
/**
 * Create a new PowerPanel from functions that supply the current for each channel, total current, voltage, and temperature.
 *
 * @param currentForChannel the function that returns the current for a given channel; may not be null
 * @param totalCurrent the function that returns total current; may not be null
 * @param voltage the function that returns voltage; may not be null
 * @param temperature the function that returns temperature; may not be null
 * @return the power panel; never null
 * @see Hardware#powerPanel()
 */
public static PowerPanel create(IntToDoubleFunction currentForChannel, DoubleSupplier totalCurrent, DoubleSupplier voltage,
        DoubleSupplier temperature) {
    return new PowerPanel() {

        @Override
        public CurrentSensor getCurrentSensor(int channel) {
            return () -> currentForChannel.applyAsDouble(channel);
        }

        @Override
        public CurrentSensor getTotalCurrentSensor() {
            return totalCurrent::getAsDouble;
        }

        @Override
        public VoltageSensor getVoltageSensor() {
            return voltage::getAsDouble;
        }

        @Override
        public TemperatureSensor getTemperatureSensor() {
            return voltage::getAsDouble;
        }
    };
}
 

import java.util.function.IntToDoubleFunction; //导入依赖的package包/类
@Test(dataProvider = "double")
public void testSetAllDouble(String name, int size, IntToDoubleFunction generator, double[] expected) {
    double[] result = new double[size];
    Arrays.setAll(result, generator);
    assertDoubleArrayEquals(result, expected, 0.05, "setAll(double[], IntToDoubleFunction) case " + name + " failed.");

    // ensure fresh array
    result = new double[size];
    Arrays.parallelSetAll(result, generator);
    assertDoubleArrayEquals(result, expected, 0.05, "setAll(double[], IntToDoubleFunction) case " + name + " failed.");
}
 

import java.util.function.IntToDoubleFunction; //导入依赖的package包/类
/**
 * Apply an int -> double function to this range, producing a double[]
 *
 * @param lambda the int -> double function
 */
public double[] mapToDouble(final IntToDoubleFunction lambda) {
	JointCallingUtils.nonNull(lambda, "the lambda function cannot be null");
    final double[] result = new double[size()];
    for (int i = from; i < to; i++) {
        result[i - from] = lambda.applyAsDouble(i);
    }
    return result;
}
 

import java.util.function.IntToDoubleFunction; //导入依赖的package包/类
/**
 * Sums the values of an int -> double function applied to this range
 *
 * @param lambda the int -> double function
 */
public double sum(final IntToDoubleFunction lambda) {
	JointCallingUtils.nonNull(lambda, "the lambda function cannot be null");
    double result = 0;
    for (int i = from; i < to; i++) {
        result += lambda.applyAsDouble(i);
    }
    return result;
}
 

import java.util.function.IntToDoubleFunction; //导入依赖的package包/类
/**
 * Finds best, in terms of score sum, combined match where each word occurs 
 * at most once and doesn't overlap with any other
 * @param wordMatches  - matches of words
 * @param distanceCoef - multiplication coefficient applied to score of 
 *                       resulting combined submatch, accepting  
 *                       distance (in chars) between last two words
 */
static public Seq findBestCombinedMatch(Multimap<Integer, ScoredMatch> wordMatches, 
                                        IntToDoubleFunction distanceCoef) {
    List<Seq> words = new ArrayList<>();
    wordMatches.entries().forEach(e -> words.add(Seq.of(e.getKey(), e.getValue())));
    Collections.sort(words, Comparator.comparing(Seq::effectiveStart));
    Seq best = null;
    List<Seq> seqs = new ArrayList<>();
    for (Seq w : words) {
        int k = seqs.size();
        for (int i = 0; i < k; i++) {
            Seq s  = seqs.get(i);
            Seq ns = s.append(w, distanceCoef.applyAsDouble(w.start - s.end));   // continued sequence
            if (ns != null) {
                seqs.add(ns);
                if (best == null || best.score < ns.score)
                    best = ns;
            }
        }
        if (!w.singleWord)
            throw new IllegalArgumentException();
        seqs.add(w);
        if (best == null || best.score < w.score)
            best = w;
    }
    return best;
}
 

import java.util.function.IntToDoubleFunction; //导入依赖的package包/类
/**
*
*/
@Test
public void shouldMemoizeIntToDoubleFunctionWithKeyFunction() {
    // given
    final IntToDoubleFunction function = a -> 123D;
    final IntFunction<String> keyFunction = a -> "key";

    // when
    final IntToDoubleFunction memoize = CaffeineMemoize.intToDoubleFunction(function, keyFunction);

    // then
    Assert.assertNotNull("Memoized IntToDoubleFunction is NULL", memoize);
}
 

import java.util.function.IntToDoubleFunction; //导入依赖的package包/类
/**
*
*/
@Test
public void shouldMemoizeIntToDoubleFunction() {
    // given
    final IntToDoubleFunction function = a -> 123D;

    // when
    final IntToDoubleFunction memoize = CaffeineMemoize.intToDoubleFunction(function);

    // then
    Assert.assertNotNull("Memoized IntToDoubleFunction is NULL", memoize);
}