Convenience accessor for all property members of the supplied type element. - Java javax.lang.model.element

Java examples for javax.lang.model.element:TypeElement

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Description

Convenience accessor for all property members of the supplied type element.

Demo Code

/**********************************************************************
Copyright (c) 2010 Andy Jefferson and others. All rights reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at//  ww  w .  ja  v  a 2  s .c  o  m

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

Contributors:
   ...
 **********************************************************************/
//package com.java2s;
import java.util.ArrayList;

import java.util.Iterator;
import java.util.List;

import javax.lang.model.element.Element;
import javax.lang.model.element.ElementKind;
import javax.lang.model.element.ExecutableElement;
import javax.lang.model.element.TypeElement;

import javax.lang.model.type.TypeKind;
import javax.lang.model.type.TypeMirror;

public class Main {
    /**
     * Convenience accessor for all property members of the supplied type element.
     * @param el The type element
     * @return The property members
     */
    public static List<? extends Element> getPropertyMembers(TypeElement el) {
        List<? extends Element> members = el.getEnclosedElements();
        List<Element> propertyMembers = new ArrayList<Element>();
        Iterator<? extends Element> memberIter = members.iterator();
        while (memberIter.hasNext()) {
            Element member = memberIter.next();
            if (member.getKind() == ElementKind.METHOD) {
                ExecutableElement method = (ExecutableElement) member;
                if (isJavaBeanGetter(method) || isJavaBeanSetter(method)) {
                    propertyMembers.add(member);
                }
            }
        }
        return propertyMembers;
    }

    /**
     * Convenience method to return if the provided method is a java bean getter.
     * @param method The method
     * @return Whether it is a java bean getter
     */
    public static boolean isJavaBeanGetter(ExecutableElement method) {
        String methodName = method.getSimpleName().toString();
        if (method.getKind() == ElementKind.METHOD
                && method.getParameters().isEmpty()) {
            if (returnsBoolean(method) && methodName.startsWith("is")) {
                return true;
            } else if (methodName.startsWith("get") && !returnsVoid(method)) {
                return true;
            }
        }
        return false;
    }

    /**
     * Convenience method to return if the provided method is a java bean setter.
     * @param method The method
     * @return Whether it is a java bean setter
     */
    public static boolean isJavaBeanSetter(ExecutableElement method) {
        String methodName = method.getSimpleName().toString();
        return method.getKind() == ElementKind.METHOD
                && methodName.startsWith("set")
                && method.getParameters().isEmpty() && !returnsVoid(method);
    }

    /**
     * Convenience method returning if the provided method returns boolean.
     * @param method The method
     * @return Whether it returns boolean
     */
    public static boolean returnsBoolean(ExecutableElement method) {
        TypeMirror type = method.getReturnType();
        return (type != null && (type.getKind() == TypeKind.BOOLEAN || "java.lang.Boolean"
                .equals(type.toString())));
    }

    /**
     * Convenience method returning if the provided method returns void.
     * @param method The method
     * @return Whether it returns void
     */
    public static boolean returnsVoid(ExecutableElement method) {
        TypeMirror type = method.getReturnType();
        return (type != null && type.getKind() == TypeKind.VOID);
    }
}

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