判断参数是否符合要求的一个类

最新推荐文章于 2021-03-05 00:16:56 发布

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最新推荐文章于 2021-03-05 00:16:56 发布

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CC 4.0 BY-SA版权

文章标签： java

原文链接：http://www.cnblogs.com/softidea/p/3334379.html

本文介绍了一个Java中用于参数校验的工具类，包括基本类型校验、集合为空检查等方法，确保程序运行时输入参数的有效性和合法性。

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import java.util.Collection;

public class Args {

    public static void check(final boolean expression, final String message) {
        if (!expression) {
            throw new IllegalArgumentException(message);
        }
    }

    public static void check(final boolean expression, final String message, final Object... args) {
        if (!expression) {
            throw new IllegalArgumentException(String.format(message, args));
        }
    }

    public static <T> T notNull(final T argument, final String name) {
        if (argument == null) {
            throw new IllegalArgumentException(name + " may not be null");
        }
        return argument;
    }

    public static <T extends CharSequence> T notEmpty(final T argument, final String name) {
        if (argument == null) {
            throw new IllegalArgumentException(name + " may not be null");
        }
        if (TextUtils.isEmpty(argument)) {
            throw new IllegalArgumentException(name + " may not be empty");
        }
        return argument;
    }

    public static <T extends CharSequence> T notBlank(final T argument, final String name) {
        if (argument == null) {
            throw new IllegalArgumentException(name + " may not be null");
        }
        if (TextUtils.isBlank(argument)) {
            throw new IllegalArgumentException(name + " may not be blank");
        }
        return argument;
    }

    public static <E, T extends Collection<E>> T notEmpty(final T argument, final String name) {
        if (argument == null) {
            throw new IllegalArgumentException(name + " may not be null");
        }
        if (argument.isEmpty()) {
            throw new IllegalArgumentException(name + " may not be empty");
        }
        return argument;
    }

    public static int positive(final int n, final String name) {
        if (n <= 0) {
            throw new IllegalArgumentException(name + " may not be negative or zero");
        }
        return n;
    }

    public static long positive(final long n, final String name) {
        if (n <= 0) {
            throw new IllegalArgumentException(name + " may not be negative or zero");
        }
        return n;
    }

    public static int notNegative(final int n, final String name) {
        if (n < 0) {
            throw new IllegalArgumentException(name + " may not be negative");
        }
        return n;
    }

    public static long notNegative(final long n, final String name) {
        if (n < 0) {
            throw new IllegalArgumentException(name + " may not be negative");
        }
        return n;
    }

}