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[Java教程]判断参数是否符合要求的一个类
0 2013-09-23 16:00:15 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 notNull(final T argument, final String name) { if (argument == null) { throw new IllegalArgumentException(name + " may not be null"); } return argument; } public static 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 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 > 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; }}
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