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package org.glassfish.jersey.message.internal;

import java.io.IOException;
import java.io.InputStream;
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.BadRequestException;
import javax.ws.rs.ProcessingException;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.HttpHeaders;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.core.NoContentException;
import javax.ws.rs.ext.MessageBodyReader;
import javax.ws.rs.ext.ReaderInterceptor;
import javax.ws.rs.ext.ReaderInterceptorContext;

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 reader 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 MessageBodyReader message body reader} execution interceptor is inserted,
 * which finally reads an entity from 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 ReaderInterceptorExecutor extends InterceptorExecutor
        implements ReaderInterceptorContext, ServiceLocatorSupplier {

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

    private InputStream inputStream;
    private final MultivaluedMap headers;

    private final Iterator interceptors;
    private int processedCount;
    private final MessageBodyWorkers workers;
    private final boolean translateNce;

    private final ServiceLocator serviceLocator;

    /**
     * Constructs a new executor to read given type from provided {@link InputStream entityStream}.
     *
     * @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 message headers.
     * @param propertiesDelegate request-scoped properties delegate.
     * @param inputStream        entity input stream.
     * @param workers            {@link org.glassfish.jersey.message.MessageBodyWorkers Message body workers}.
     * @param readerInterceptors Reader interceptor that are to be used to intercept the reading of an entity.
     *                           The interceptors will be executed in the same order as given in this parameter.
     * @param translateNce       if {@code true}, the {@link javax.ws.rs.core.NoContentException} thrown by a selected message body
     *                           reader will be translated into a {@link javax.ws.rs.BadRequestException} as required by
     * @param serviceLocator Service locator.
     */
    public ReaderInterceptorExecutor(final Class rawType, final Type type,
                                     final Annotation[] annotations,
                                     final MediaType mediaType,
                                     final MultivaluedMap headers,
                                     final PropertiesDelegate propertiesDelegate,
                                     final InputStream inputStream,
                                     final MessageBodyWorkers workers,
                                     final Iterable readerInterceptors,
                                     final boolean translateNce,
                                     final ServiceLocator serviceLocator) {

        super(rawType, type, annotations, mediaType, propertiesDelegate);
        this.headers = headers;
        this.inputStream = inputStream;
        this.workers = workers;
        this.translateNce = translateNce;
        this.serviceLocator = serviceLocator;

        final List effectiveInterceptors = Lists.newArrayList(readerInterceptors);
        effectiveInterceptors.add(new TerminalReaderInterceptor());

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

    /**
     * Starts the interceptor chain execution.
     *
     * @return an entity read from the stream.
     */
    @Override
    @SuppressWarnings("unchecked")
    public Object proceed() throws IOException {
        if (!interceptors.hasNext()) {
            throw new ProcessingException(LocalizationMessages.ERROR_INTERCEPTOR_READER_PROCEED());
        }
        final ReaderInterceptor interceptor = interceptors.next();
        traceBefore(interceptor, MsgTraceEvent.RI_BEFORE);
        try {
            return interceptor.aroundReadFrom(this);
        } finally {
            processedCount++;
            traceAfter(interceptor, MsgTraceEvent.RI_AFTER);
        }
    }

    @Override
    public InputStream getInputStream() {
        return this.inputStream;
    }

    @Override
    public void setInputStream(final InputStream is) {
        this.inputStream = is;

    }

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

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

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

    /**
     * Terminal reader interceptor which choose the appropriate {@link MessageBodyReader}
     * and reads the entity from the input stream. The order of actions is the following: 
* 1. choose the appropriate {@link MessageBodyReader}
* 3. reads the entity from the output stream
*/ private class TerminalReaderInterceptor implements ReaderInterceptor { @Override @SuppressWarnings("unchecked") public Object aroundReadFrom(final ReaderInterceptorContext context) throws IOException, WebApplicationException { processedCount--; //this is not regular interceptor -> count down traceBefore(null, MsgTraceEvent.RI_BEFORE); try { final TracingLogger tracingLogger = getTracingLogger(); if (tracingLogger.isLogEnabled(MsgTraceEvent.MBR_FIND)) { tracingLogger.log(MsgTraceEvent.MBR_FIND, context.getType().getName(), (context.getGenericType() instanceof Class ? ((Class) context.getGenericType()).getName() : context.getGenericType()), String.valueOf(context.getMediaType()), java.util.Arrays.toString(context.getAnnotations())); } final MessageBodyReader bodyReader = workers.getMessageBodyReader( context.getType(), context.getGenericType(), context.getAnnotations(), context.getMediaType(), ReaderInterceptorExecutor.this); final EntityInputStream input = new EntityInputStream(context.getInputStream()); if (bodyReader == null) { if (input.isEmpty() && !context.getHeaders().containsKey(HttpHeaders.CONTENT_TYPE)) { return null; } else { LOGGER.log(Level.FINE, LocalizationMessages.ERROR_NOTFOUND_MESSAGEBODYREADER(context.getMediaType(), context.getType(), context.getGenericType())); throw new MessageBodyProviderNotFoundException(LocalizationMessages.ERROR_NOTFOUND_MESSAGEBODYREADER( context.getMediaType(), context.getType(), context.getGenericType())); } } Object entity = invokeReadFrom(context, bodyReader, input); if (bodyReader instanceof CompletableReader) { entity = ((CompletableReader) bodyReader).complete(entity); } return entity; } finally { clearLastTracedInterceptor(); traceAfter(null, MsgTraceEvent.RI_AFTER); } } @SuppressWarnings("unchecked") private Object invokeReadFrom(final ReaderInterceptorContext context, final MessageBodyReader reader, final EntityInputStream input) throws WebApplicationException, IOException { final TracingLogger tracingLogger = getTracingLogger(); final long timestamp = tracingLogger.timestamp(MsgTraceEvent.MBR_READ_FROM); final UnCloseableInputStream stream = new UnCloseableInputStream(input, reader); try { final Object entity; if (translateNce) { try { entity = reader.readFrom(context.getType(), context.getGenericType(), context.getAnnotations(), context.getMediaType(), context.getHeaders(), stream); } catch (final NoContentException ex) { throw new BadRequestException(ex); } } else { entity = reader.readFrom(context.getType(), context.getGenericType(), context.getAnnotations(), context.getMediaType(), context.getHeaders(), stream); } return entity; } finally { tracingLogger.logDuration(MsgTraceEvent.MBR_READ_FROM, timestamp, reader); } } } /** * {@link javax.ws.rs.ext.MessageBodyReader}s should not close the given {@link java.io.InputStream stream}. This input * stream makes sure that the stream is not closed even if MBR tries to do it. */ private static class UnCloseableInputStream extends InputStream { private final InputStream original; private final MessageBodyReader reader; private UnCloseableInputStream(final InputStream original, final MessageBodyReader reader) { this.original = original; this.reader = reader; } @Override public int read() throws IOException { return original.read(); } @Override public int read(final byte[] b) throws IOException { return original.read(b); } @Override public int read(final byte[] b, final int off, final int len) throws IOException { return original.read(b, off, len); } @Override public long skip(final long l) throws IOException { return original.skip(l); } @Override public int available() throws IOException { return original.available(); } @Override public synchronized void mark(final int i) { original.mark(i); } @Override public synchronized void reset() throws IOException { original.reset(); } @Override public boolean markSupported() { return original.markSupported(); } @Override public void close() throws IOException { if (LOGGER.isLoggable(Level.FINE)) { LOGGER.log(Level.FINE, LocalizationMessages.MBR_TRYING_TO_CLOSE_STREAM(reader.getClass())); } } } }




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