Example usage for java.util Map computeIfAbsent

Introduction

In this page you can find the example usage for java.util Map computeIfAbsent.

Prototype

default V computeIfAbsent(K key, Function<? super K, ? extends V> mappingFunction) 

Source Link

Document

If the specified key is not already associated with a value (or is mapped to null ), attempts to compute its value using the given mapping function and enters it into this map unless null .

Usage

From source file:at.gridtec.lambda4j.function.tri.conversion.TriDoubleToIntFunction.java

/**
 * Returns a memoized (caching) version of this {@link TriDoubleToIntFunction}. Whenever it is called, the mapping
 * between the input parameters and the return value is preserved in a cache, making subsequent calls returning the
 * memoized value instead of computing the return value again.
 * <p>/*from  w  w w. ja  va2 s .  co  m*/
 * Unless the function and therefore the used cache will be garbage-collected, it will keep all memoized values
 * forever.
 *
 * @return A memoized (caching) version of this {@code TriDoubleToIntFunction}.
 * @implSpec This implementation does not allow the input parameters or return value to be {@code null} for the
 * resulting memoized function, as the cache used internally does not permit {@code null} keys or values.
 * @implNote The returned memoized function can be safely used concurrently from multiple threads which makes it
 * thread-safe.
 */
@Nonnull
default TriDoubleToIntFunction memoized() {
    if (isMemoized()) {
        return this;
    } else {
        final Map<Triple<Double, Double, Double>, Integer> cache = new ConcurrentHashMap<>();
        final Object lock = new Object();
        return (TriDoubleToIntFunction & Memoized) (value1, value2, value3) -> {
            final int returnValue;
            synchronized (lock) {
                returnValue = cache.computeIfAbsent(Triple.of(value1, value2, value3),
                        key -> applyAsInt(key.getLeft(), key.getMiddle(), key.getRight()));
            }
            return returnValue;
        };
    }
}

---

From source file:at.gridtec.lambda4j.function.tri.conversion.TriBooleanToIntFunction.java

/**
 * Returns a memoized (caching) version of this {@link TriBooleanToIntFunction}. Whenever it is called, the mapping
 * between the input parameters and the return value is preserved in a cache, making subsequent calls returning the
 * memoized value instead of computing the return value again.
 * <p>/*from   w ww  .  ja  va 2  s .c  om*/
 * Unless the function and therefore the used cache will be garbage-collected, it will keep all memoized values
 * forever.
 *
 * @return A memoized (caching) version of this {@code TriBooleanToIntFunction}.
 * @implSpec This implementation does not allow the input parameters or return value to be {@code null} for the
 * resulting memoized function, as the cache used internally does not permit {@code null} keys or values.
 * @implNote The returned memoized function can be safely used concurrently from multiple threads which makes it
 * thread-safe.
 */
@Nonnull
default TriBooleanToIntFunction memoized() {
    if (isMemoized()) {
        return this;
    } else {
        final Map<Triple<Boolean, Boolean, Boolean>, Integer> cache = new ConcurrentHashMap<>();
        final Object lock = new Object();
        return (TriBooleanToIntFunction & Memoized) (value1, value2, value3) -> {
            final int returnValue;
            synchronized (lock) {
                returnValue = cache.computeIfAbsent(Triple.of(value1, value2, value3),
                        key -> applyAsInt(key.getLeft(), key.getMiddle(), key.getRight()));
            }
            return returnValue;
        };
    }
}

---

From source file:at.gridtec.lambda4j.function.tri.conversion.TriCharToByteFunction.java

/**
 * Returns a memoized (caching) version of this {@link TriCharToByteFunction}. Whenever it is called, the mapping
 * between the input parameters and the return value is preserved in a cache, making subsequent calls returning the
 * memoized value instead of computing the return value again.
 * <p>/*from  w  w  w .j a va2s.co  m*/
 * Unless the function and therefore the used cache will be garbage-collected, it will keep all memoized values
 * forever.
 *
 * @return A memoized (caching) version of this {@code TriCharToByteFunction}.
 * @implSpec This implementation does not allow the input parameters or return value to be {@code null} for the
 * resulting memoized function, as the cache used internally does not permit {@code null} keys or values.
 * @implNote The returned memoized function can be safely used concurrently from multiple threads which makes it
 * thread-safe.
 */
@Nonnull
default TriCharToByteFunction memoized() {
    if (isMemoized()) {
        return this;
    } else {
        final Map<Triple<Character, Character, Character>, Byte> cache = new ConcurrentHashMap<>();
        final Object lock = new Object();
        return (TriCharToByteFunction & Memoized) (value1, value2, value3) -> {
            final byte returnValue;
            synchronized (lock) {
                returnValue = cache.computeIfAbsent(Triple.of(value1, value2, value3),
                        key -> applyAsByte(key.getLeft(), key.getMiddle(), key.getRight()));
            }
            return returnValue;
        };
    }
}

---

From source file:at.gridtec.lambda4j.function.tri.conversion.TriCharToIntFunction.java

/**
 * Returns a memoized (caching) version of this {@link TriCharToIntFunction}. Whenever it is called, the mapping
 * between the input parameters and the return value is preserved in a cache, making subsequent calls returning the
 * memoized value instead of computing the return value again.
 * <p>//from ww w  .  j  a v  a 2 s  . co m
 * Unless the function and therefore the used cache will be garbage-collected, it will keep all memoized values
 * forever.
 *
 * @return A memoized (caching) version of this {@code TriCharToIntFunction}.
 * @implSpec This implementation does not allow the input parameters or return value to be {@code null} for the
 * resulting memoized function, as the cache used internally does not permit {@code null} keys or values.
 * @implNote The returned memoized function can be safely used concurrently from multiple threads which makes it
 * thread-safe.
 */
@Nonnull
default TriCharToIntFunction memoized() {
    if (isMemoized()) {
        return this;
    } else {
        final Map<Triple<Character, Character, Character>, Integer> cache = new ConcurrentHashMap<>();
        final Object lock = new Object();
        return (TriCharToIntFunction & Memoized) (value1, value2, value3) -> {
            final int returnValue;
            synchronized (lock) {
                returnValue = cache.computeIfAbsent(Triple.of(value1, value2, value3),
                        key -> applyAsInt(key.getLeft(), key.getMiddle(), key.getRight()));
            }
            return returnValue;
        };
    }
}

---

From source file:at.gridtec.lambda4j.function.tri.conversion.TriCharToLongFunction.java

/**
 * Returns a memoized (caching) version of this {@link TriCharToLongFunction}. Whenever it is called, the mapping
 * between the input parameters and the return value is preserved in a cache, making subsequent calls returning the
 * memoized value instead of computing the return value again.
 * <p>//from  w w w  .  j  a  v a 2s.  c  o m
 * Unless the function and therefore the used cache will be garbage-collected, it will keep all memoized values
 * forever.
 *
 * @return A memoized (caching) version of this {@code TriCharToLongFunction}.
 * @implSpec This implementation does not allow the input parameters or return value to be {@code null} for the
 * resulting memoized function, as the cache used internally does not permit {@code null} keys or values.
 * @implNote The returned memoized function can be safely used concurrently from multiple threads which makes it
 * thread-safe.
 */
@Nonnull
default TriCharToLongFunction memoized() {
    if (isMemoized()) {
        return this;
    } else {
        final Map<Triple<Character, Character, Character>, Long> cache = new ConcurrentHashMap<>();
        final Object lock = new Object();
        return (TriCharToLongFunction & Memoized) (value1, value2, value3) -> {
            final long returnValue;
            synchronized (lock) {
                returnValue = cache.computeIfAbsent(Triple.of(value1, value2, value3),
                        key -> applyAsLong(key.getLeft(), key.getMiddle(), key.getRight()));
            }
            return returnValue;
        };
    }
}

---

From source file:at.gridtec.lambda4j.function.tri.conversion.TriDoubleToFloatFunction.java

/**
 * Returns a memoized (caching) version of this {@link TriDoubleToFloatFunction}. Whenever it is called, the mapping
 * between the input parameters and the return value is preserved in a cache, making subsequent calls returning the
 * memoized value instead of computing the return value again.
 * <p>//from  w  ww. j a va  2  s.  c  o  m
 * Unless the function and therefore the used cache will be garbage-collected, it will keep all memoized values
 * forever.
 *
 * @return A memoized (caching) version of this {@code TriDoubleToFloatFunction}.
 * @implSpec This implementation does not allow the input parameters or return value to be {@code null} for the
 * resulting memoized function, as the cache used internally does not permit {@code null} keys or values.
 * @implNote The returned memoized function can be safely used concurrently from multiple threads which makes it
 * thread-safe.
 */
@Nonnull
default TriDoubleToFloatFunction memoized() {
    if (isMemoized()) {
        return this;
    } else {
        final Map<Triple<Double, Double, Double>, Float> cache = new ConcurrentHashMap<>();
        final Object lock = new Object();
        return (TriDoubleToFloatFunction & Memoized) (value1, value2, value3) -> {
            final float returnValue;
            synchronized (lock) {
                returnValue = cache.computeIfAbsent(Triple.of(value1, value2, value3),
                        key -> applyAsFloat(key.getLeft(), key.getMiddle(), key.getRight()));
            }
            return returnValue;
        };
    }
}

---

From source file:at.gridtec.lambda4j.function.tri.conversion.TriDoubleToShortFunction.java

/**
 * Returns a memoized (caching) version of this {@link TriDoubleToShortFunction}. Whenever it is called, the mapping
 * between the input parameters and the return value is preserved in a cache, making subsequent calls returning the
 * memoized value instead of computing the return value again.
 * <p>//from  w w  w .  ja  va 2 s.c  o  m
 * Unless the function and therefore the used cache will be garbage-collected, it will keep all memoized values
 * forever.
 *
 * @return A memoized (caching) version of this {@code TriDoubleToShortFunction}.
 * @implSpec This implementation does not allow the input parameters or return value to be {@code null} for the
 * resulting memoized function, as the cache used internally does not permit {@code null} keys or values.
 * @implNote The returned memoized function can be safely used concurrently from multiple threads which makes it
 * thread-safe.
 */
@Nonnull
default TriDoubleToShortFunction memoized() {
    if (isMemoized()) {
        return this;
    } else {
        final Map<Triple<Double, Double, Double>, Short> cache = new ConcurrentHashMap<>();
        final Object lock = new Object();
        return (TriDoubleToShortFunction & Memoized) (value1, value2, value3) -> {
            final short returnValue;
            synchronized (lock) {
                returnValue = cache.computeIfAbsent(Triple.of(value1, value2, value3),
                        key -> applyAsShort(key.getLeft(), key.getMiddle(), key.getRight()));
            }
            return returnValue;
        };
    }
}

---

From source file:at.gridtec.lambda4j.function.tri.conversion.TriBooleanToFloatFunction.java

/**
 * Returns a memoized (caching) version of this {@link TriBooleanToFloatFunction}. Whenever it is called, the
 * mapping between the input parameters and the return value is preserved in a cache, making subsequent calls
 * returning the memoized value instead of computing the return value again.
 * <p>// w ww  .  j  ava2  s  .c  o m
 * Unless the function and therefore the used cache will be garbage-collected, it will keep all memoized values
 * forever.
 *
 * @return A memoized (caching) version of this {@code TriBooleanToFloatFunction}.
 * @implSpec This implementation does not allow the input parameters or return value to be {@code null} for the
 * resulting memoized function, as the cache used internally does not permit {@code null} keys or values.
 * @implNote The returned memoized function can be safely used concurrently from multiple threads which makes it
 * thread-safe.
 */
@Nonnull
default TriBooleanToFloatFunction memoized() {
    if (isMemoized()) {
        return this;
    } else {
        final Map<Triple<Boolean, Boolean, Boolean>, Float> cache = new ConcurrentHashMap<>();
        final Object lock = new Object();
        return (TriBooleanToFloatFunction & Memoized) (value1, value2, value3) -> {
            final float returnValue;
            synchronized (lock) {
                returnValue = cache.computeIfAbsent(Triple.of(value1, value2, value3),
                        key -> applyAsFloat(key.getLeft(), key.getMiddle(), key.getRight()));
            }
            return returnValue;
        };
    }
}

---

From source file:at.gridtec.lambda4j.function.tri.conversion.TriBooleanToShortFunction.java

/**
 * Returns a memoized (caching) version of this {@link TriBooleanToShortFunction}. Whenever it is called, the
 * mapping between the input parameters and the return value is preserved in a cache, making subsequent calls
 * returning the memoized value instead of computing the return value again.
 * <p>//from w w  w .j  ava  2  s .c  om
 * Unless the function and therefore the used cache will be garbage-collected, it will keep all memoized values
 * forever.
 *
 * @return A memoized (caching) version of this {@code TriBooleanToShortFunction}.
 * @implSpec This implementation does not allow the input parameters or return value to be {@code null} for the
 * resulting memoized function, as the cache used internally does not permit {@code null} keys or values.
 * @implNote The returned memoized function can be safely used concurrently from multiple threads which makes it
 * thread-safe.
 */
@Nonnull
default TriBooleanToShortFunction memoized() {
    if (isMemoized()) {
        return this;
    } else {
        final Map<Triple<Boolean, Boolean, Boolean>, Short> cache = new ConcurrentHashMap<>();
        final Object lock = new Object();
        return (TriBooleanToShortFunction & Memoized) (value1, value2, value3) -> {
            final short returnValue;
            synchronized (lock) {
                returnValue = cache.computeIfAbsent(Triple.of(value1, value2, value3),
                        key -> applyAsShort(key.getLeft(), key.getMiddle(), key.getRight()));
            }
            return returnValue;
        };
    }
}

---

From source file:at.gridtec.lambda4j.function.tri.conversion.TriDoubleToCharFunction.java

/**
 * Returns a memoized (caching) version of this {@link TriDoubleToCharFunction}. Whenever it is called, the mapping
 * between the input parameters and the return value is preserved in a cache, making subsequent calls returning the
 * memoized value instead of computing the return value again.
 * <p>//from w w  w .  j  a v  a2s .c o  m
 * Unless the function and therefore the used cache will be garbage-collected, it will keep all memoized values
 * forever.
 *
 * @return A memoized (caching) version of this {@code TriDoubleToCharFunction}.
 * @implSpec This implementation does not allow the input parameters or return value to be {@code null} for the
 * resulting memoized function, as the cache used internally does not permit {@code null} keys or values.
 * @implNote The returned memoized function can be safely used concurrently from multiple threads which makes it
 * thread-safe.
 */
@Nonnull
default TriDoubleToCharFunction memoized() {
    if (isMemoized()) {
        return this;
    } else {
        final Map<Triple<Double, Double, Double>, Character> cache = new ConcurrentHashMap<>();
        final Object lock = new Object();
        return (TriDoubleToCharFunction & Memoized) (value1, value2, value3) -> {
            final char returnValue;
            synchronized (lock) {
                returnValue = cache.computeIfAbsent(Triple.of(value1, value2, value3),
                        key -> applyAsChar(key.getLeft(), key.getMiddle(), key.getRight()));
            }
            return returnValue;
        };
    }
}

---

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