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A bundle project producing JAX-RS RI bundles. The primary artifact is an "all-in-one" OSGi-fied JAX-RS RI bundle (jaxrs-ri.jar). Attached to that are two compressed JAX-RS RI archives. The first archive (jaxrs-ri.zip) consists of binary RI bits and contains the API jar (under "api" directory), RI libraries (under "lib" directory) as well as all external RI dependencies (under "ext" directory). The secondary archive (jaxrs-ri-src.zip) contains buildable JAX-RS RI source bundle and contains the API jar (under "api" directory), RI sources (under "src" directory) as well as all external RI dependencies (under "ext" directory). The second archive also contains "build.xml" ANT script that builds the RI sources. To build the JAX-RS RI simply unzip the archive, cd to the created jaxrs-ri directory and invoke "ant" from the command line.

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/*
 * Copyright (c) 2011, 2020 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

package org.glassfish.jersey.server.model.internal;

import java.io.Flushable;
import java.io.IOException;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Type;
import java.util.Collection;
import java.util.List;

import jakarta.ws.rs.ProcessingException;
import jakarta.ws.rs.core.GenericEntity;
import jakarta.ws.rs.core.Response;
import jakarta.ws.rs.sse.SseEventSink;

import org.glassfish.jersey.server.ContainerRequest;
import org.glassfish.jersey.server.internal.inject.ConfiguredValidator;
import org.glassfish.jersey.server.model.Invocable;
import org.glassfish.jersey.server.model.Parameter;
import org.glassfish.jersey.server.spi.internal.ParamValueFactoryWithSource;
import org.glassfish.jersey.server.spi.internal.ParameterValueHelper;
import org.glassfish.jersey.server.spi.internal.ResourceMethodDispatcher;
import org.glassfish.jersey.server.spi.internal.ValueParamProvider;

/**
 * An implementation of {@link ResourceMethodDispatcher.Provider} that
 * creates instances of {@link ResourceMethodDispatcher}.
 *
 * @author Paul Sandoz
 * @author Marek Potociar
 */
class JavaResourceMethodDispatcherProvider implements ResourceMethodDispatcher.Provider {

    private final Collection allValueProviders;

    JavaResourceMethodDispatcherProvider(Collection allValueProviders) {
        this.allValueProviders = allValueProviders;
    }

    @Override
    public ResourceMethodDispatcher create(final Invocable resourceMethod,
            final InvocationHandler invocationHandler,
            final ConfiguredValidator validator) {
        final List> valueProviders =
                ParameterValueHelper.createValueProviders(allValueProviders, resourceMethod);
        final Class returnType = resourceMethod.getHandlingMethod().getReturnType();

        ResourceMethodDispatcher resourceMethodDispatcher = null;
        if (Response.class.isAssignableFrom(returnType)) {
            resourceMethodDispatcher =
                    new ResponseOutInvoker(resourceMethod, invocationHandler, valueProviders, validator);
        } else if (returnType != void.class) {
            if (returnType == Object.class || GenericEntity.class.isAssignableFrom(returnType)) {
                resourceMethodDispatcher =
                        new ObjectOutInvoker(resourceMethod, invocationHandler, valueProviders, validator);
            } else {
                resourceMethodDispatcher =
                        new TypeOutInvoker(resourceMethod, invocationHandler, valueProviders, validator);
            }
        } else {
            // return type is void
            int i = 0;
            for (final Parameter parameter : resourceMethod.getParameters()) {
                if (SseTypeResolver.isSseSinkParam(parameter.getRawType())) {
                    resourceMethodDispatcher =
                            new SseEventSinkInvoker(resourceMethod, invocationHandler, valueProviders, validator, i);
                    break;
                }
                i++;
            }

            if (resourceMethodDispatcher == null) {
                resourceMethodDispatcher = new VoidOutInvoker(resourceMethod, invocationHandler, valueProviders, validator);
            }
        }

        return resourceMethodDispatcher;
    }

    private abstract static class AbstractMethodParamInvoker extends AbstractJavaResourceMethodDispatcher {

        private final List> valueProviders;

        AbstractMethodParamInvoker(
                final Invocable resourceMethod,
                final InvocationHandler handler,
                final List> valueProviders,
                final ConfiguredValidator validator) {
            super(resourceMethod, handler, validator);
            this.valueProviders = valueProviders;
        }

        final Object[] getParamValues(ContainerRequest request) {
            return ParameterValueHelper.getParameterValues(valueProviders, request);
        }
    }

    private static final class SseEventSinkInvoker extends AbstractMethodParamInvoker {

        private final int parameterIndex;

        SseEventSinkInvoker(
                final Invocable resourceMethod,
                final InvocationHandler handler,
                final List> valueProviders,
                final ConfiguredValidator validator,
                final int parameterIndex) {
            super(resourceMethod, handler, valueProviders, validator);
            this.parameterIndex = parameterIndex;
        }

        @Override
        protected Response doDispatch(final Object resource, final ContainerRequest request) throws ProcessingException {
            final Object[] paramValues = getParamValues(request);
            invoke(request, resource, paramValues);

            final SseEventSink eventSink = (SseEventSink) paramValues[parameterIndex];

            if (eventSink == null) {
                throw new IllegalArgumentException("SseEventSink parameter detected, but not found.");
            } else if (eventSink instanceof Flushable) {
                try {
                    ((Flushable) eventSink).flush();
                } catch (IOException e) {
                    // ignore.
                }
            }
            return Response.ok().entity(eventSink).build();
        }
    }

    private static final class VoidOutInvoker extends AbstractMethodParamInvoker {

        VoidOutInvoker(
                final Invocable resourceMethod,
                final InvocationHandler handler,
                final List> valueProviders,
                final ConfiguredValidator validator) {
            super(resourceMethod, handler, valueProviders, validator);
        }

        @Override
        protected Response doDispatch(final Object resource, final ContainerRequest containerRequest) throws ProcessingException {
            invoke(containerRequest, resource, getParamValues(containerRequest));
            return Response.noContent().build();
        }
    }

    private static final class ResponseOutInvoker extends AbstractMethodParamInvoker {

        ResponseOutInvoker(
                final Invocable resourceMethod,
                final InvocationHandler handler,
                final List> valueProviders,
                final ConfiguredValidator validator) {
            super(resourceMethod, handler, valueProviders, validator);
        }

        @Override
        protected Response doDispatch(Object resource, final ContainerRequest containerRequest) throws ProcessingException {
            return Response.class.cast(invoke(containerRequest, resource, getParamValues(containerRequest)));
        }
    }

    private static final class ObjectOutInvoker extends AbstractMethodParamInvoker {

        ObjectOutInvoker(
                final Invocable resourceMethod,
                final InvocationHandler handler,
                final List> valueProviders,
                final ConfiguredValidator validator) {
            super(resourceMethod, handler, valueProviders, validator);
        }

        @Override
        protected Response doDispatch(final Object resource, final ContainerRequest containerRequest) throws ProcessingException {
            final Object o = invoke(containerRequest, resource, getParamValues(containerRequest));

            if (o instanceof Response) {
                return Response.class.cast(o);
            } else if (o != null) {
                return Response.ok().entity(o).build();
            } else {
                return Response.noContent().build();
            }
        }
    }

    private static final class TypeOutInvoker extends AbstractMethodParamInvoker {

        private final Type t;

        TypeOutInvoker(
                final Invocable resourceMethod,
                final InvocationHandler handler,
                final List> valueProviders,
                final ConfiguredValidator validator) {
            super(resourceMethod, handler, valueProviders, validator);
            this.t = resourceMethod.getHandlingMethod().getGenericReturnType();
        }

        @Override
        protected Response doDispatch(final Object resource, final ContainerRequest containerRequest) throws ProcessingException {
            final Object o = invoke(containerRequest, resource, getParamValues(containerRequest));
            if (o != null) {
                if (o instanceof Response) {
                    return Response.class.cast(o);
                }
                return Response.ok().entity(o).build();
            } else {
                return Response.noContent().build();
            }
        }
    }
}