com.github.jeluard.guayaba.base.Preconditions2.java Source code

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Here is the source code for com.github.jeluard.guayaba.base.Preconditions2.java

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/**
 * Copyright 2012 Julien Eluard
 * This project includes software developed by Julien Eluard: https://github.com/jeluard/
 *
 * 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 com.github.jeluard.guayaba.base;

import com.google.common.base.Preconditions;

import java.util.Collection;

/**
 * Extend helper methods from {@link Preconditions}.
 */
public final class Preconditions2 {

    private Preconditions2() {
    }

    /**
     * Ensure specified {@link Collection} is not {@link Collection#isEmpty()}.
     *
     * @param collection a collection
     * @param name a representation of {@code collection} used to build the error message
     * @throws IllegalArgumentException if {@code collection} is {@link Collection#isEmpty()}
     */
    public static <T extends Collection<?>> T checkNotEmpty(final T collection, final String name) {
        Preconditions.checkNotNull(name, "null name");
        Preconditions.checkArgument(!Preconditions.checkNotNull(collection, "null " + name).isEmpty(),
                name + " is empty");
        return collection;
    }

    /**
     * Ensure specified {@code size} is positive.
     *
     * @param size
     * @return 
     */
    public static int checkSize(final int size) {
        Preconditions.checkArgument(size >= 0, "size must be positive");
        return size;
    }

}