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 * obtain a copy of the License at
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package org.glassfish.jersey.message.internal;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.util.Iterator;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.ws.rs.ProcessingException;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.MessageBodyWriter;
import javax.ws.rs.ext.WriterInterceptor;
import javax.ws.rs.ext.WriterInterceptorContext;

import org.glassfish.jersey.internal.LocalizationMessages;
import org.glassfish.jersey.internal.PropertiesDelegate;
import org.glassfish.jersey.internal.inject.ServiceLocatorSupplier;
import org.glassfish.jersey.message.MessageBodyWorkers;

import org.glassfish.hk2.api.ServiceLocator;

import jersey.repackaged.com.google.common.collect.Lists;

/**
 * Represents writer interceptor chain executor for both client and server side.
 * It constructs wrapped interceptor chain and invokes it. At the end of the chain
 * a {@link MessageBodyWriter message body writer} execution interceptor is inserted,
 * which writes entity to the output stream provided by the chain.
 *
 * @author Miroslav Fuksa (miroslav.fuksa at oracle.com)
 * @author Jakub Podlesak (jakub.podlesak at oracle.com)
 */
public final class WriterInterceptorExecutor extends InterceptorExecutor
        implements WriterInterceptorContext, ServiceLocatorSupplier {

    private static final Logger LOGGER = Logger.getLogger(WriterInterceptorExecutor.class.getName());

    private OutputStream outputStream;
    private final MultivaluedMap headers;
    private Object entity;

    private final Iterator iterator;
    private int processedCount;

    private final ServiceLocator serviceLocator;


    /**
     * Constructs a new executor to write given type to provided {@link InputStream entityStream}.

     *
     * @param entity entity object to be processed.
     * @param rawType     raw Java entity type.
     * @param type        generic Java entity type.
     * @param annotations array of annotations on the declaration of the artifact
     *            that will be initialized with the produced instance. E.g. if the message
     *            body is to be converted into a method parameter, this will be the
     *            annotations on that parameter returned by
     *            {@code Method.getParameterAnnotations}.
     * @param mediaType media type of the HTTP entity.
     * @param headers mutable HTTP headers associated with HTTP entity.
     * @param propertiesDelegate request-scoped properties delegate.
     * @param entityStream {@link java.io.InputStream} from which an entity will be read. The stream is not
     *            closed after reading the entity.
     * @param workers {@link org.glassfish.jersey.message.MessageBodyWorkers Message body workers}.
     * @param writerInterceptors Writer interceptor that are to be used to intercept the writing of an entity. The interceptors
     * @param serviceLocator Service locator.
     */
    public WriterInterceptorExecutor(Object entity, Class rawType,
                                     Type type,
                                     Annotation[] annotations,
                                     MediaType mediaType,
                                     MultivaluedMap headers,
                                     PropertiesDelegate propertiesDelegate,
                                     OutputStream entityStream,
                                     MessageBodyWorkers workers,
                                     Iterable writerInterceptors,
                                     ServiceLocator serviceLocator) {

        super(rawType, type, annotations, mediaType, propertiesDelegate);
        this.entity = entity;
        this.headers = headers;
        this.outputStream = entityStream;
        this.serviceLocator = serviceLocator;

        final List effectiveInterceptors = Lists.newArrayList(writerInterceptors);
        effectiveInterceptors.add(new TerminalWriterInterceptor(workers));

        this.iterator = effectiveInterceptors.iterator();
        this.processedCount = 0;
    }

    /**
     * Returns next {@link WriterInterceptor interceptor} in the chain. Stateful method.
     *
     * @return Next interceptor.
     */
    public WriterInterceptor getNextInterceptor() {
        if (!iterator.hasNext()) {
            return null;
        }
        return iterator.next();
    }

    /**
     * Starts the interceptor chain execution.
     */
    @Override
    @SuppressWarnings("unchecked")
    public void proceed() throws IOException {
        WriterInterceptor nextInterceptor = getNextInterceptor();
        if (nextInterceptor == null) {
            throw new ProcessingException(LocalizationMessages.ERROR_INTERCEPTOR_WRITER_PROCEED());
        }
        traceBefore(nextInterceptor, MsgTraceEvent.WI_BEFORE);
        try {
            nextInterceptor.aroundWriteTo(this);
        } finally {
            processedCount++;
            traceAfter(nextInterceptor, MsgTraceEvent.WI_AFTER);
        }
    }

    @Override
    public Object getEntity() {
        return entity;
    }

    @Override
    public void setEntity(Object entity) {
        this.entity = entity;
    }

    @Override
    public OutputStream getOutputStream() {
        return this.outputStream;
    }

    @Override
    public void setOutputStream(OutputStream os) {
        this.outputStream = os;

    }

    @Override
    public MultivaluedMap getHeaders() {
        return this.headers;
    }

    /**
     * Get number of processed interceptors.
     *
     * @return number of processed interceptors.
     */
    int getProcessedCount() {
        return processedCount;
    }

    @Override
    public ServiceLocator getServiceLocator() {
        return serviceLocator;
    }

    /**
     * Terminal writer interceptor which choose the appropriate {@link MessageBodyWriter}
     * and writes the entity to the output stream. The order of actions is the following: 
* 1. choose the appropriate {@link MessageBodyWriter}
* 2. if callback is defined then it retrieves size and passes it to the callback
* 3. writes the entity to the output stream
* */ private class TerminalWriterInterceptor implements WriterInterceptor { private final MessageBodyWorkers workers; public TerminalWriterInterceptor(MessageBodyWorkers workers) { super(); this.workers = workers; } @Override @SuppressWarnings("unchecked") public void aroundWriteTo(WriterInterceptorContext context) throws WebApplicationException, IOException { processedCount--; //this is not regular interceptor -> count down traceBefore(null, MsgTraceEvent.WI_BEFORE); try { final TracingLogger tracingLogger = getTracingLogger(); if (tracingLogger.isLogEnabled(MsgTraceEvent.MBW_FIND)) { tracingLogger.log(MsgTraceEvent.MBW_FIND, context.getType().getName(), (context.getGenericType() instanceof Class ? ((Class) context.getGenericType()).getName() : context.getGenericType()), context.getMediaType(), java.util.Arrays.toString(context.getAnnotations())); } final MessageBodyWriter writer = workers.getMessageBodyWriter(context.getType(), context.getGenericType(), context.getAnnotations(), context.getMediaType(), WriterInterceptorExecutor.this); if (writer == null) { LOGGER.log(Level.SEVERE, LocalizationMessages.ERROR_NOTFOUND_MESSAGEBODYWRITER( context.getMediaType(), context.getType(), context.getGenericType())); throw new MessageBodyProviderNotFoundException(LocalizationMessages.ERROR_NOTFOUND_MESSAGEBODYWRITER( context.getMediaType(), context.getType(), context.getGenericType())); } invokeWriteTo(context, writer); } finally { clearLastTracedInterceptor(); traceAfter(null, MsgTraceEvent.WI_AFTER); } } @SuppressWarnings("unchecked") private void invokeWriteTo(WriterInterceptorContext context, MessageBodyWriter writer) throws WebApplicationException, IOException { final TracingLogger tracingLogger = getTracingLogger(); final long timestamp = tracingLogger.timestamp(MsgTraceEvent.MBW_WRITE_TO); try { writer.writeTo(context.getEntity(), context.getType(), context.getGenericType(), context.getAnnotations(), context.getMediaType(), context.getHeaders(), context.getOutputStream()); } finally { tracingLogger.logDuration(MsgTraceEvent.MBW_WRITE_TO, timestamp, writer); } } } }




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