Main.java Source code

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Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you 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
 *
 * 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.
 */

import java.lang.annotation.Annotation;
import java.lang.reflect.AnnotatedElement;

import java.security.AccessController;
import java.security.PrivilegedAction;

import java.util.StringTokenizer;

import javax.xml.bind.JAXBElement;

import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlSchema;
import javax.xml.namespace.QName;

public class Main {
    /**
     * @param clazz
     * @return namespace of root element qname or null if this is not object does not represent a
     *         root element
     */
    public static QName getXmlRootElementQNameFromObject(Object obj) {

        // A JAXBElement stores its name
        if (obj instanceof JAXBElement) {
            return ((JAXBElement<?>) obj).getName();
        }

        Class<?> clazz = (obj instanceof java.lang.Class) ? (Class<?>) obj : obj.getClass();
        return getXmlRootElementQName(clazz);
    }

    /**
     * @param clazz
     * @return namespace of root element qname or null if this is not object does not represent a
     *         root element
     */
    public static QName getXmlRootElementQName(Class<?> clazz) {

        // See if the object represents a root element
        XmlRootElement root = (XmlRootElement) getAnnotation(clazz, XmlRootElement.class);
        if (root == null) {
            return null;
        }

        String name = root.name();
        String namespace = root.namespace();

        // The name may need to be defaulted
        if (name == null || name.length() == 0 || name.equals("##default")) {
            name = getSimpleName(clazz.getCanonicalName());
        }

        // The namespace may need to be defaulted
        if (namespace == null || namespace.length() == 0 || namespace.equals("##default")) {
            Package pkg = clazz.getPackage();
            XmlSchema schema = (XmlSchema) getAnnotation(pkg, XmlSchema.class);
            if (schema != null) {
                namespace = schema.namespace();
            } else {
                namespace = "";
            }
        }

        return new QName(namespace, name);
    }

    /**
     * Get an annotation.  This is wrappered to avoid a Java2Security violation.
     * @param cls Class that contains annotation 
     * @param annotation Class of requrested Annotation
     * @return annotation or null
     */
    private static <T extends Annotation> T getAnnotation(final AnnotatedElement element,
            final Class<T> annotation) {
        return AccessController.doPrivileged(new PrivilegedAction<T>() {
            public T run() {
                return element.getAnnotation(annotation);
            }
        });
    }

    /**
     * utility method to get the last token in a "."-delimited package+classname string
     *
     * @return
     */
    private static String getSimpleName(String in) {
        if (in == null || in.length() == 0) {
            return in;
        }
        String out = null;
        StringTokenizer tokenizer = new StringTokenizer(in, ".");
        if (tokenizer.countTokens() == 0)
            out = in;
        else {
            while (tokenizer.hasMoreTokens()) {
                out = tokenizer.nextToken();
            }
        }
        return out;
    }
}