Apache CXF example source code file (AbstractAegisProvider.java)

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

Java - Apache CXF tags/keywords

abstractaegisprovider, aegiscontext, aegiscontext, annotation, annotation, class, context, contextresolver, mediatype, mediatype, messagebodyreader, messagebodywriter, reflection, type, type, util

The Apache CXF AbstractAegisProvider.java source code

/**
 * 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.
 */

package org.apache.cxf.jaxrs.provider;

import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.WeakHashMap;

import javax.ws.rs.core.Context;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.ext.ContextResolver;
import javax.ws.rs.ext.MessageBodyReader;
import javax.ws.rs.ext.MessageBodyWriter;

import org.apache.cxf.aegis.AegisContext;

public abstract class AbstractAegisProvider<T> 
    implements MessageBodyReader<T>, MessageBodyWriter {
    
    private static Map<java.lang.reflect.Type, AegisContext> classContexts      
        = new WeakHashMap<java.lang.reflect.Type, AegisContext>();
    
    protected boolean writeXsiType = true;
    protected boolean readXsiType = true;
    @Context 
    protected ContextResolver<AegisContext> resolver;
    
    public void setWriteXsiType(boolean write) {
        writeXsiType = write;
    }
    
    public void setReadXsiType(boolean read) {
        readXsiType = read;
    }
    
    public boolean isWriteable(Class<?> type, Type genericType, Annotation[] anns, MediaType mt) {
        return isSupported(type, genericType, anns);
    }
    
    public boolean isReadable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mt) {
        return isSupported(type, genericType, annotations);
    }

    public long getSize(T o, Class<?> type, Type genericType, Annotation[] annotations, MediaType mt) {
        return -1;
    }

    protected AegisContext getAegisContext(Class<?> plainClass, Type genericType) {
        
        if (resolver != null) {
            /* wierdly, the JAX-RS API keys on Class, not AegisType, so it can't possibly
             * keep generics straight. Should we ignore the resolver?
             */
            AegisContext context = resolver.getContext(plainClass);
            // it's up to the resolver to keep its contexts in a map
            if (context != null) {
                return context;
            }
        }
        
        if (genericType == null) {
            genericType = plainClass;
        }
        return getClassContext(genericType);
    }
    
    
    private AegisContext getClassContext(Type reflectionType) {
        synchronized (classContexts) {
            AegisContext context = classContexts.get(reflectionType);
            if (context == null) {
                context = new AegisContext();
                context.setWriteXsiTypes(writeXsiType); 
                context.setReadXsiTypes(readXsiType);
                Set<java.lang.reflect.Type> rootClasses = new HashSet();
                rootClasses.add(reflectionType);
                context.setRootClasses(rootClasses);
                context.initialize();
                classContexts.put(reflectionType, context);
            }
            return context;
        }
    }
    
    /**
     * For Aegis, it's not obvious to me how we'd decide that a type was hopeless.
     * @param type
     * @param genericType
     * @param annotations
     * @return
     */
    protected boolean isSupported(Class<?> type, Type genericType, Annotation[] annotations) {
        return true;
    }
    
    static void clearContexts() {
        classContexts.clear();
    }
}