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Java example source code file (JAXBWrapperAccessor.java)

This example Java source code file (JAXBWrapperAccessor.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

class, databindingexception, field, hashmap, jaxbelement, list, method, object, override, propertyaccessor, propertygetter, propertysetter, qname, reflection, security, string, util

The JAXBWrapperAccessor.java Java example source code

/*
 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package com.sun.xml.internal.ws.spi.db;

import java.lang.reflect.Array;
import java.lang.reflect.Field;
import java.lang.reflect.GenericArrayType;
import java.lang.reflect.Method;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.security.AccessController;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;

import javax.xml.bind.JAXBElement;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlElementRef;
import javax.xml.bind.annotation.XmlElementWrapper;
import javax.xml.namespace.QName;

/**
 * JAXBWrapperAccessor
 *
 * @author shih-chang.chen@oracle.com
 */
@SuppressWarnings({ "unchecked", "rawtypes" })
public class JAXBWrapperAccessor extends WrapperAccessor {

    protected Class<?> contentClass;
    protected HashMap<Object, Class> elementDeclaredTypes;

    public JAXBWrapperAccessor(Class<?> wrapperBean) {
        contentClass = (Class<?>) wrapperBean;

        HashMap<Object, PropertySetter> setByQName = new HashMap();
        HashMap<Object, PropertySetter> setByLocalpart = new HashMap();
        HashMap<String, Method> publicSetters = new HashMap();

        HashMap<Object, PropertyGetter> getByQName = new HashMap();
        HashMap<Object, PropertyGetter> getByLocalpart = new HashMap();
        HashMap<String, Method> publicGetters = new HashMap();

        HashMap<Object, Class> elementDeclaredTypesByQName = new HashMap();
        HashMap<Object, Class> elementDeclaredTypesByLocalpart = new HashMap();

        for (Method method : contentClass.getMethods()) {
            if (PropertySetterBase.setterPattern(method)) {
                String key = method.getName()
                        .substring(3, method.getName().length()).toLowerCase();
                publicSetters.put(key, method);
            }
            if (PropertyGetterBase.getterPattern(method)) {
                String methodName = method.getName();
                String key = methodName.startsWith("is") ? methodName
                        .substring(2, method.getName().length()).toLowerCase()
                        : methodName.substring(3, method.getName().length())
                                .toLowerCase();
                publicGetters.put(key, method);
            }
        }
        HashSet<String> elementLocalNames = new HashSet();
        for (Field field : getAllFields(contentClass)) {
            XmlElementWrapper xmlElemWrapper = field.getAnnotation(XmlElementWrapper.class);
            XmlElement xmlElem = field.getAnnotation(XmlElement.class);
            XmlElementRef xmlElemRef = field.getAnnotation(XmlElementRef.class);
            String fieldName = field.getName().toLowerCase();
            String namespace = "";
            String localName = field.getName();
            if (xmlElemWrapper != null) {
                namespace = xmlElemWrapper.namespace();
                if (xmlElemWrapper.name() != null && !xmlElemWrapper.name().equals("")
                        && !xmlElemWrapper.name().equals("##default")) {
                    localName = xmlElemWrapper.name();
                }
            }else if (xmlElem != null) {
                namespace = xmlElem.namespace();
                if (xmlElem.name() != null && !xmlElem.name().equals("")
                        && !xmlElem.name().equals("##default")) {
                    localName = xmlElem.name();
                }
            } else if (xmlElemRef != null) {
                namespace = xmlElemRef.namespace();
                if (xmlElemRef.name() != null && !xmlElemRef.name().equals("")
                        && !xmlElemRef.name().equals("##default")) {
                    localName = xmlElemRef.name();
                }
            }
            if (elementLocalNames.contains(localName)) {
                this.elementLocalNameCollision = true;
            } else {
                elementLocalNames.add(localName);
            }

            QName qname = new QName(namespace, localName);
            if (field.getType().equals(JAXBElement.class)) {
                if (field.getGenericType() instanceof ParameterizedType) {
                    Type arg = ((ParameterizedType) field.getGenericType())
                            .getActualTypeArguments()[0];
                    if (arg instanceof Class) {
                        elementDeclaredTypesByQName.put(qname, (Class) arg);
                        elementDeclaredTypesByLocalpart.put(localName,
                                (Class) arg);
                    } else if (arg instanceof GenericArrayType) {
                        Type componentType = ((GenericArrayType) arg)
                                .getGenericComponentType();
                        if (componentType instanceof Class) {
                            Class arrayClass = Array.newInstance(
                                    (Class) componentType, 0).getClass();
                            elementDeclaredTypesByQName.put(qname, arrayClass);
                            elementDeclaredTypesByLocalpart.put(localName,
                                    arrayClass);
                        }
                    }
                }

            }
            // _return
            if (fieldName.startsWith("_") && !localName.startsWith("_")) {
                fieldName = fieldName.substring(1);
            }
            Method setMethod = publicSetters.get(fieldName);
            Method getMethod = publicGetters.get(fieldName);
            PropertySetter setter = createPropertySetter(field, setMethod);
            PropertyGetter getter = createPropertyGetter(field, getMethod);
            setByQName.put(qname, setter);
            setByLocalpart.put(localName, setter);
            getByQName.put(qname, getter);
            getByLocalpart.put(localName, getter);
        }
        if (this.elementLocalNameCollision) {
            this.propertySetters = setByQName;
            this.propertyGetters = getByQName;
            elementDeclaredTypes = elementDeclaredTypesByQName;
        } else {
            this.propertySetters = setByLocalpart;
            this.propertyGetters = getByLocalpart;
            elementDeclaredTypes = elementDeclaredTypesByLocalpart;
        }
    }

    static protected List<Field> getAllFields(Class clz) {
        List<Field> list = new ArrayList();
        while (!Object.class.equals(clz)) {
            list.addAll(Arrays.asList(getDeclaredFields(clz)));
            clz = clz.getSuperclass();
        }
        return list;
    }

    static protected Field[] getDeclaredFields(final Class<?> clz) {
        try {
            return (System.getSecurityManager() == null) ? clz .getDeclaredFields() :
                AccessController.doPrivileged(new PrivilegedExceptionAction<Field[]>() {
                        @Override
                        public Field[] run() throws IllegalAccessException {
                            return clz.getDeclaredFields();
                        }
                    });
        } catch (PrivilegedActionException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            return null;
        }
    }

    static protected PropertyGetter createPropertyGetter(Field field, Method getMethod) {
        if (!field.isAccessible()) {
            if (getMethod != null) {
                MethodGetter methodGetter = new MethodGetter(getMethod);
                if (methodGetter.getType().toString().equals(field.getType().toString())) {
                    return methodGetter;
                }
            }
        }
        return new FieldGetter(field);
    }

    static protected PropertySetter createPropertySetter(Field field,
            Method setter) {
        if (!field.isAccessible()) {
            if (setter != null) {
                MethodSetter injection = new MethodSetter(setter);
                if (injection.getType().toString().equals(field.getType().toString())) {
                    return injection;
                }
            }
        }
        return new FieldSetter(field);
    }

    private Class getElementDeclaredType(QName name) {
        Object key = (this.elementLocalNameCollision) ? name : name
                .getLocalPart();
        return elementDeclaredTypes.get(key);
    }

    @Override
    public PropertyAccessor getPropertyAccessor(String ns, String name) {
        final QName n = new QName(ns, name);
        final PropertySetter setter = getPropertySetter(n);
        final PropertyGetter getter = getPropertyGetter(n);
        final boolean isJAXBElement = setter.getType()
                .equals(JAXBElement.class);
        final boolean isListType = java.util.List.class.isAssignableFrom(setter
                .getType());
        final Class elementDeclaredType = isJAXBElement ? getElementDeclaredType(n)
                : null;
        return new PropertyAccessor() {
            @Override
            public Object get(Object bean) throws DatabindingException {
                Object val;
                if (isJAXBElement) {
                    JAXBElement<Object> jaxbElement = (JAXBElement) getter.get(bean);
                    val = (jaxbElement == null) ? null : jaxbElement.getValue();
                } else {
                    val = getter.get(bean);
                }
                if (val == null && isListType) {
                    val = new java.util.ArrayList();
                    set(bean, val);
                }
                return val;
            }

            @Override
            public void set(Object bean, Object value) throws DatabindingException {
                if (isJAXBElement) {
                    JAXBElement<Object> jaxbElement = new JAXBElement(
                            n, elementDeclaredType, contentClass, value);
                    setter.set(bean, jaxbElement);
                } else {
                    setter.set(bean, value);
                }
            }
        };
    }
}

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