org.simmetrics.metrics.Math.java Source code

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Here is the source code for org.simmetrics.metrics.Math.java

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/*
 * #%L
 * Simmetrics Core
 * %%
 * Copyright (C) 2014 - 2016 Simmetrics Authors
 * %%
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * #L%
 */

package org.simmetrics.metrics;

import java.util.Set;

import com.google.common.collect.Multiset;
import com.google.common.collect.Multisets;
import com.google.common.collect.Sets;

final class Math {

    private Math() {
        // Utility class
    }

    static float max(float a, float b, float c) {
        return java.lang.Math.max(java.lang.Math.max(a, b), c);
    }

    static int max(final int a, final int b, final int c) {
        return java.lang.Math.max(java.lang.Math.max(a, b), c);
    }

    static float max(float a, float b, float c, float d) {
        return java.lang.Math.max(java.lang.Math.max(java.lang.Math.max(a, b), c), d);
    }

    static int max(final int a, final int b, final int c, final int d) {
        return java.lang.Math.max(java.lang.Math.max(java.lang.Math.max(a, b), c), d);
    }

    static float min(float a, float b, float c) {
        return java.lang.Math.min(java.lang.Math.min(a, b), c);
    }

    static int min(final int a, final int b, final int c) {
        return java.lang.Math.min(java.lang.Math.min(a, b), c);
    }

    static float min(final float a, final float b, final float c, final float d) {
        return java.lang.Math.min(java.lang.Math.min(java.lang.Math.min(a, b), c), d);
    }

    static int min(final int a, final int b, final int c, final int d) {
        return java.lang.Math.min(java.lang.Math.min(java.lang.Math.min(a, b), c), d);
    }

    static <T> Multiset<T> union(Multiset<T> a, Multiset<T> b) {
        // Lager set first for performance improvement.
        // See: MathCaliper
        if (a.size() < b.size()) {
            return Multisets.union(b, a);
        }

        return Multisets.union(a, b);
    }

    static <T> Multiset<T> intersection(Multiset<T> a, Multiset<T> b) {
        // Smaller set first for performance improvement.
        // See: MathCaliper
        if (a.size() < b.size()) {
            return Multisets.intersection(a, b);
        }

        return Multisets.intersection(b, a);
    }

    static <T> Set<T> intersection(Set<T> a, Set<T> b) {
        // Smaller set first for performance improvement.
        // See: MathCaliper and note at Sets.intersection
        if (a.size() < b.size()) {
            return Sets.intersection(a, b);
        }

        return Sets.intersection(b, a);
    }
}