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The Checker Framework enhances Java's type system to make it more powerful and useful. This lets software developers detect and prevent errors in their Java programs. The Checker Framework includes compiler plug-ins ("checkers") that find bugs or verify their absence. It also permits you to write your own compiler plug-ins.

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package org.checkerframework.checker.index.qual;

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import org.checkerframework.framework.qual.JavaExpression;
import org.checkerframework.framework.qual.SubtypeOf;

/**
 * The annotated expression evaluates to an integer whose value is less than or equal to the lengths
 * of all the given sequences. ("LTEq" stands for "Less than or equal to".)
 *
 * For example, an expression with type {@code @LTLengthOf({"a", "b"})} is less than or equal to
 * both {@code a.length} and {@code b.length}. The sequences {@code a} and {@code b} might have
 * different lengths.
 *
 * {@code @LTEqLengthOf({"a"})} = {@code @LTLengthOf(value={"a"}, offset=-1)}, and

 * {@code @LTEqLengthOf(value={"a"}, offset=x)} = {@code @LTLengthOf(value={"a"}, offset=x-1)} for
 * any x.
 *
 * @checker_framework.manual #index-checker Index Checker
 */
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.TYPE_USE, ElementType.TYPE_PARAMETER})
@SubtypeOf(UpperBoundUnknown.class)
public @interface LTEqLengthOf {
  /** Sequences, each of which is at least as long as the annotated expression's value. */
  @JavaExpression
  public String[] value();
}