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/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 2012-2015 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* http://glassfish.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
* If applicable, add the following below the License Header, with the fields
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*/
package org.glassfish.jersey.message.internal;
import java.io.IOException;
import java.io.InputStream;
import java.io.PushbackInputStream;
import javax.ws.rs.ProcessingException;
import org.glassfish.jersey.internal.LocalizationMessages;
/**
* Entity input stream customized for entity message processing:
*
* - contains {@link #isEmpty()} method.
* - {@link #close()} method throws Jersey-specific runtime exception in case of an IO error.
*
*
* @author Marek Potociar (marek.potociar at oracle.com)
*/
public class EntityInputStream extends InputStream {
private InputStream input;
private boolean closed = false;
/**
* Create an entity input stream instance wrapping the original input stream.
*
* In case the original entity stream is already of type {@code EntityInputStream},
* the stream is returned without wrapping.
*
* @param inputStream input stream.
* @return entity input stream.
*/
public static EntityInputStream create(InputStream inputStream) {
if (inputStream instanceof EntityInputStream) {
return (EntityInputStream) inputStream;
}
return new EntityInputStream(inputStream);
}
/**
* Extension constructor.
*
* @param input underlying wrapped input stream.
*/
public EntityInputStream(InputStream input) {
this.input = input;
}
@Override
public int read() throws IOException {
return input.read();
}
@Override
public int read(byte[] b) throws IOException {
return input.read(b);
}
@Override
public int read(byte[] b, int off, int len) throws IOException {
return input.read(b, off, len);
}
@Override
public long skip(long n) throws IOException {
return input.skip(n);
}
@Override
public int available() throws IOException {
return input.available();
}
@Override
public void mark(int readLimit) {
input.mark(readLimit);
}
@Override
public boolean markSupported() {
return input.markSupported();
}
/**
* {@inheritDoc}
*
* The method is customized to not throw an {@link IOException} if the reset operation fails. Instead,
* a runtime {@link javax.ws.rs.ProcessingException} is thrown.
*
*
* @throws javax.ws.rs.ProcessingException in case the reset operation on the underlying entity input stream failed.
*/
@Override
public void reset() {
try {
input.reset();
} catch (IOException ex) {
throw new ProcessingException(LocalizationMessages.MESSAGE_CONTENT_BUFFER_RESET_FAILED(), ex);
}
}
/**
* {@inheritDoc}
*
* The method is customized to not throw an {@link IOException} if the close operation fails. Instead,
* a warning message is logged.
*
*/
@Override
public void close() throws ProcessingException {
final InputStream in = input;
if (in == null) {
return;
}
if (!closed) {
try {
in.close();
} catch (IOException ex) {
// This e.g. means that the underlying socket stream got closed by other thread somehow...
throw new ProcessingException(LocalizationMessages.MESSAGE_CONTENT_INPUT_STREAM_CLOSE_FAILED(), ex);
} finally {
closed = true;
}
}
}
/**
* Check if the underlying entity stream is empty.
*
* Note that the operation may need to block until a first byte (or EOF) is available in the stream.
*
*
* @return {@code true} if the entity stream is empty, {@code false} otherwise.
*/
public boolean isEmpty() {
ensureNotClosed();
final InputStream in = input;
if (in == null) {
return true;
}
try {
// Try #markSupported first - #available on WLS waits until socked timeout is reached when chunked encoding is used.
if (in.markSupported()) {
in.mark(1);
int i = in.read();
in.reset();
return i == -1;
} else {
try {
if (in.available() > 0) {
return false;
}
} catch (IOException ioe) {
// NOOP. Try other approaches as this can fail on WLS.
}
int b = in.read();
if (b == -1) {
return true;
}
PushbackInputStream pbis;
if (in instanceof PushbackInputStream) {
pbis = (PushbackInputStream) in;
} else {
pbis = new PushbackInputStream(in, 1);
input = pbis;
}
pbis.unread(b);
return false;
}
} catch (IOException ex) {
throw new ProcessingException(ex);
}
}
/**
* Check that the entity input stream has not been closed yet.
*
* @throws IllegalStateException in case the entity input stream has been closed.
*/
public void ensureNotClosed() throws IllegalStateException {
if (closed) {
throw new IllegalStateException(LocalizationMessages.ERROR_ENTITY_STREAM_CLOSED());
}
}
/**
* Get the closed status of this input stream.
*
* @return {@code true} if the stream has been closed, {@code false} otherwise.
*/
public boolean isClosed() {
return closed;
}
/**
* Get the wrapped input stream instance.
*
* @return wrapped input stream instance.
*/
public final InputStream getWrappedStream() {
return input;
}
/**
* Set the wrapped input stream instance.
*
* @param wrapped new input stream instance to be wrapped.
*/
public final void setWrappedStream(InputStream wrapped) {
input = wrapped;
}
}