Java Elements.overrides方法代码示例

import javax.lang.model.util.Elements; //导入方法依赖的package包/类
private boolean isMethodAvailable(TypeElement subTypeElement, 
        ExecutableElement execElem, TypeElement superTypeElement) {
    Elements elements = workingCopy.getElements();
    List<? extends Element> memberElements = elements.getAllMembers(superTypeElement);
    for (Element elem : memberElements) {
        if(ElementKind.METHOD.equals(elem.getKind())){
            if(execElem.getModifiers().contains(Modifier.STATIC) && elements.hides(execElem, elem)){
                return true;
            }else{
                if(execElem.equals(elem) || elements.overrides(execElem, (ExecutableElement)elem, 
                        subTypeElement)){
                    return true;
                }
            }
        }
    }

    return false;
}
 

import javax.lang.model.util.Elements; //导入方法依赖的package包/类
/**
 * Returns the set of all non-private methods from {@code type}, including methods that it
 * inherits from its ancestors. Inherited methods that are overridden are not included in the
 * result. So if {@code type} defines {@code public String toString()}, the returned set will
 * contain that method, but not the {@code toString()} method defined by {@code Object}.
 * <p/>
 * <p>The returned set may contain more than one method with the same signature, if
 * {@code type} inherits those methods from different ancestors. For example, if it
 * inherits from unrelated interfaces {@code One} and {@code Two} which each define
 * {@code void foo();}, and if it does not itself override the {@code foo()} method,
 * then both {@code One.foo()} and {@code Two.foo()} will be in the returned set.
 *
 * @param type         the type whose own and inherited methods are to be returned
 * @param elementUtils an {@link Elements} object, typically returned by
 *                     {@link javax.annotation.processing.AbstractProcessor#processingEnv processingEnv}<!--
 *                     -->.{@link javax.annotation.processing.ProcessingEnvironment.getElementUtils()
 *                     getElementUtils()}
 */
public static ImmutableSet<ExecutableElement> getLocalAndInheritedMethods(
        TypeElement type, Elements elementUtils) {

    SetMultimap<String, ExecutableElement> methodMap = LinkedHashMultimap.create();
    getLocalAndInheritedMethods(getPackage(type), type, methodMap);
    // Find methods that are overridden. We do this using `Elements.overrides`, which means
    // that it is inherently a quadratic operation, since we have to compare every method against
    // every other method. We reduce the performance impact by (a) grouping methods by name, since
    // a method cannot override another method with a different name, and (b) making sure that
    // methods in ancestor types precede those in descendant types, which means we only have to
    // check a method against the ones that follow it in that order.
    Set<ExecutableElement> overridden = new LinkedHashSet<ExecutableElement>();
    for (String methodName : methodMap.keySet()) {
        List<ExecutableElement> methodList = ImmutableList.copyOf(methodMap.get(methodName));
        for (int i = 0; i < methodList.size(); i++) {
            ExecutableElement methodI = methodList.get(i);
            for (int j = i + 1; j < methodList.size(); j++) {
                ExecutableElement methodJ = methodList.get(j);
                if (elementUtils.overrides(methodJ, methodI, type)) {
                    overridden.add(methodI);
                }
            }
        }
    }
    Set<ExecutableElement> methods = new LinkedHashSet<ExecutableElement>(methodMap.values());
    methods.removeAll(overridden);
    return ImmutableSet.copyOf(methods);
}