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checker-qual-android contains annotations (type qualifiers) that a programmer writes to specify Java code for type-checking by the Checker Framework. The checker-qual-android artifact is identical to the checker-qual artifact, except that in checker-qual-android annotations have classfile retention. The default Android Gradle plugin retains types annotated with runtime annotations in the main dex, but strips out class-retention annotations.

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package org.checkerframework.checker.signature.qual;

import org.checkerframework.framework.qual.SubtypeOf;

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;

/**
 * Represents a method descriptor (JVM representation of method signature) as defined in the Java Virtual
 * Machine Specification, section 4.3.3.
 *
 * Example:
 *
 * 
 *  package edu.cs.washington;
 *  public class BinaryName {
 *    private class Inner {
 *      public void method(Object obj, int i) {}
 *    }
 *  }
 * 
 *
 * In this example method descriptor for method 'method': (Ljava/lang/Object;I)Z
 *
 * @checker_framework.manual #signature-checker Signature Checker
 */
@Documented
@Retention(RetentionPolicy.CLASS)
@Target({ElementType.TYPE_USE, ElementType.TYPE_PARAMETER})
@SubtypeOf(SignatureUnknown.class)
public @interface MethodDescriptor {}