Validate.java

package jakiro.util;


public class Validate {

    private static final String DEFAULT_IS_NULL_EX_MESSAGE = "The validated object is null";
    private static final String DEFAULT_IS_TRUE_EX_MESSAGE = "The validated expression is false";
    private static final String DEFAULT_NOT_BLANK_EX_MESSAGE = "The validated character sequence is blank";

    public static <T> T notNull(final T object) {
        return notNull(object, DEFAULT_IS_NULL_EX_MESSAGE);
    }

    public static <T> T notNull(final T object, final String message, final Object... values) {
        if (object == null) {
            throw new NullPointerException(String.format(message, values));
        }
        return object;
    }

    public static void isTrue(final boolean expression, final String message, final Object... values) {
        if (expression == false) {
            throw new IllegalArgumentException(String.format(message, values));
        }
    }

    public static void isTrue(final boolean expression) {
        if (expression == false) {
            throw new IllegalArgumentException(DEFAULT_IS_TRUE_EX_MESSAGE);
        }
    }
    
    public static <T extends CharSequence> T notBlank(final T chars) {
        return notBlank(chars, DEFAULT_NOT_BLANK_EX_MESSAGE);
    }
    
    public static <T extends CharSequence> T notBlank(final T chars, final String message, final Object... values) {
        if (chars == null) {
            throw new NullPointerException(String.format(message, values));
        }
        if (StringUtils.isBlank(chars)) {
            throw new IllegalArgumentException(String.format(message, values));
        }
        return chars;
    }
}