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graphql-java sans slf4j

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package graphql;

import java.util.Collection;

public class Assert {

    public static  T assertNotNull(T object, String errorMessage) {
        if (object != null) return object;
        throw new AssertException(errorMessage);
    }

    public static  Collection assertNotEmpty(Collection c, String errorMessage) {
        if (c == null || c.isEmpty()) throw new AssertException(errorMessage);
        return c;
    }

    private static final String invalidNameErrorMessage = "Name must be non-null, non-empty and match [_A-Za-z][_0-9A-Za-z]*";

    /**
     * Validates that the Lexical token name matches the current spec.
     * currently non null, non empty,
     *
     * @param name - the name to be validated.
     * @return the name if valid, or AssertException if invalid.
     */
    public static String assertValidName(String name) {
        if (name != null && !name.isEmpty() && name.matches("[_A-Za-z][_0-9A-Za-z]*")) {
            return name;
        }
        throw new AssertException(invalidNameErrorMessage);
    }

}