io.twipple.springframework.data.clusterpoint.convert.support.ConversionUtils.java Source code

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Here is the source code for io.twipple.springframework.data.clusterpoint.convert.support.ConversionUtils.java

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/*
 * This file is part of Spring Data Clusterpoint.
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2015 the author or authors
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package io.twipple.springframework.data.clusterpoint.convert.support;

import org.springframework.util.Assert;
import org.springframework.util.CollectionUtils;

import javax.validation.constraints.NotNull;
import java.util.Collection;
import java.util.Collections;

/**
 * A collection of entity conversion utility methods.
 *
 * @author Olegs Briska
 */
public final class ConversionUtils {

    private ConversionUtils() {
        // This class is not intended to be instantiated.
    }

    /**
     * Returns a collection from the given source object.
     *
     * @param source the source object.
     * @return the target collection.
     */
    @NotNull
    public static Collection<?> asCollection(@NotNull Object source) {

        Assert.notNull(source);

        if (source instanceof Collection) {
            return (Collection<?>) source;
        }

        if (source.getClass().isArray()) {
            return CollectionUtils.arrayToList(source);
        }

        return Collections.singleton(source);
    }

    /**
     * Check if the left class is a subtype of the right.
     *
     * @param left  the first class.
     * @param right the second class.
     * @return true if it is a subtype, false otherwise.
     */
    public static boolean isSubtype(@NotNull Class<?> left, @NotNull Class<?> right) {

        Assert.notNull(left);
        Assert.notNull(right);

        return left.isAssignableFrom(right) && !left.equals(right);
    }
}