org.leadpony.justify.internal.base.Arguments Maven / Gradle / Ivy

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/*
 * Copyright 2018-2019 the Justify 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.
 */

package org.leadpony.justify.internal.base;

import java.math.BigDecimal;
import java.util.Collection;
import java.util.LinkedHashSet;
import java.util.Set;

/**
 * Provides parameter validation for methods.
 *
 * @author leadpony
 */
public final class Arguments {

    private Arguments() {
    }

    public static  T requireNonNull(T object, String name) {
        if (object == null) {
            throw new NullPointerException(name + " must not be null.");
        }
        return object;
    }

    public static String requireNonBlank(String object, String name) {
        if (object.trim().isEmpty()) {
            throw new IllegalArgumentException(name + " must not be blank.");
        }
        return object;
    }

    public static  T[] requireNonEmpty(T[] array, String name) {
        if (array.length == 0) {
            throw new IllegalArgumentException(name + " must not be empty.");
        }
        return array;
    }

    public static  Collection requireNonEmpty(Collection collection, String name) {
        if (collection.isEmpty()) {
            throw new IllegalArgumentException(name + " must not be empty.");
        }
        return collection;
    }

    public static long requirePositive(long value, String name) {
        if (value <= 0) {
            throw new IllegalArgumentException(name + " must not be positive.");
        }
        return value;
    }

    public static double requirePositive(double value, String name) {
        if (value <= 0.0) {
            throw new IllegalArgumentException(name + " must not be positive.");
        }
        return value;
    }

    public static BigDecimal requirePositive(BigDecimal value, String name) {
        if (value.signum() <= 0) {
            throw new IllegalArgumentException(name + " must not be positive.");
        }
        return value;
    }

    public static int requireNonNegative(int value, String name) {
        if (value < 0) {
            throw new IllegalArgumentException(name + " must not be negative.");
        }
        return value;
    }

    public static  Set requireUnique(T[] values, String name) {
        Set set = new LinkedHashSet<>();
        for (T value : values) {
            if (set.contains(value)) {
                throw new IllegalArgumentException(name + " must be unique.");
            }
            set.add(value);
        }
        return set;
    }
}