android/guava/src/com/google/common/base/Preconditions.java
public static void checkState(
      boolean expression,
      @NullableDecl String errorMessageTemplate,
      @NullableDecl Object... errorMessageArgs) {
    if (!expression) {
      throw new IllegalStateException(lenientFormat(errorMessageTemplate, errorMessageArgs));
    }
  }
public static void checkState(
      boolean expression,
      @NullableDecl String errorMessageTemplate,
      @NullableDecl Object... errorMessageArgs) {
    if (!expression) {
      throw new IllegalStateException(lenientFormat(errorMessageTemplate, errorMessageArgs));
    }
  }
public static void checkState ( boolean expression , @ NullableDecl String errorMessageTemplate , @ NullableDecl Object ... errorMessageArgs ) { if ( ! expression ) { throw new IllegalStateException ( lenientFormat ( errorMessageTemplate , errorMessageArgs ) ) ; } }
Ensures the truth of an expression involving the state of the calling instance, but not
involving any parameters to the calling method.

@param expression a boolean expression
@param errorMessageTemplate a template for the exception message should the check fail. The
message is formed by replacing each {@code %s} placeholder in the template with an
argument. These are matched by position - the first {@code %s} gets {@code
errorMessageArgs[0]}, etc. Unmatched arguments will be appended to the formatted message in
square braces. Unmatched placeholders will be left as-is.
@param errorMessageArgs the arguments to be substituted into the message template. Arguments
are converted to strings using {@link String#valueOf(Object)}.
@throws IllegalStateException if {@code expression} is false
@see Verify#verify Verify.verify()
Ensures the truth of an expression involving the state of the calling instance but not involving any parameters to the calling method .