ca.uhn.fhir.rest.client.ClientInvocationHandler.java Source code

Introduction

Here is the source code for ca.uhn.fhir.rest.client.ClientInvocationHandler.java

Source

package ca.uhn.fhir.rest.client;

/*
 * #%L
 * HAPI FHIR - Core Library
 * %%
 * Copyright (C) 2014 - 2015 University Health Network
 * %%
 * 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
 * 
 *      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.
 * #L%
 */

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.util.Map;

import org.apache.http.client.HttpClient;

import ca.uhn.fhir.context.FhirContext;
import ca.uhn.fhir.rest.client.ClientInvocationHandlerFactory.ILambda;
import ca.uhn.fhir.rest.method.BaseMethodBinding;

class ClientInvocationHandler extends BaseClient implements InvocationHandler {

    private final Map<Method, BaseMethodBinding<?>> myBindings;
    private final Map<Method, Object> myMethodToReturnValue;
    private FhirContext myContext;
    private Map<Method, ILambda> myMethodToLambda;

    public ClientInvocationHandler(HttpClient theClient, FhirContext theContext, String theUrlBase,
            Map<Method, Object> theMethodToReturnValue, Map<Method, BaseMethodBinding<?>> theBindings,
            Map<Method, ILambda> theMethodToLambda, RestfulClientFactory theFactory) {
        super(theClient, theUrlBase, theFactory);

        myContext = theContext;
        myMethodToReturnValue = theMethodToReturnValue;
        myBindings = theBindings;
        myMethodToLambda = theMethodToLambda;
    }

    public void addBinding(Method theMethod, BaseMethodBinding<?> theBinding) {
        myBindings.put(theMethod, theBinding);
    }

    @Override
    public Object invoke(Object theProxy, Method theMethod, Object[] theArgs) throws Throwable {
        Object directRetVal = myMethodToReturnValue.get(theMethod);
        if (directRetVal != null) {
            return directRetVal;
        }

        BaseMethodBinding<?> binding = myBindings.get(theMethod);
        if (binding != null) {
            BaseHttpClientInvocation clientInvocation = binding.invokeClient(theArgs);
            return invokeClient(myContext, binding, clientInvocation);
        }

        ILambda lambda = myMethodToLambda.get(theMethod);
        if (lambda != null) {
            return lambda.handle(this, theArgs);
        }

        throw new UnsupportedOperationException(
                "The method '" + theMethod.getName() + "' in type " + theMethod.getDeclaringClass().getSimpleName()
                        + " has no handler. Did you forget to annotate it with a RESTful method annotation?");
    }

    @Override
    public FhirContext getFhirContext() {
        return myContext;
    }

}