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/*
* Copyright 2014, Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
*
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package io.grpc.protobuf.lite;
import com.google.common.io.ByteStreams;
import com.google.protobuf.CodedOutputStream;
import com.google.protobuf.MessageLite;
import com.google.protobuf.Parser;
import io.grpc.Drainable;
import io.grpc.KnownLength;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import javax.annotation.Nullable;
/**
* An {@link InputStream} backed by a protobuf.
*/
class ProtoInputStream extends InputStream implements Drainable, KnownLength {
// ProtoInputStream is first initialized with a *message*. *partial* is initially null.
// Once there has been a read operation on this stream, *message* is serialized to *partial* and
// set to null.
@Nullable private MessageLite message;
private final Parser<?> parser;
@Nullable private ByteArrayInputStream partial;
public ProtoInputStream(MessageLite message, Parser<?> parser) {
this.message = message;
this.parser = parser;
}
@Override
public int drainTo(OutputStream target) throws IOException {
int written;
if (message != null) {
written = message.getSerializedSize();
message.writeTo(target);
message = null;
} else if (partial != null) {
written = (int) ByteStreams.copy(partial, target);
partial = null;
} else {
written = 0;
}
return written;
}
@Override
public int read() throws IOException {
if (message != null) {
partial = new ByteArrayInputStream(message.toByteArray());
message = null;
}
if (partial != null) {
return partial.read();
}
return -1;
}
@Override
public int read(byte[] b, int off, int len) throws IOException {
if (message != null) {
int size = message.getSerializedSize();
if (size == 0) {
message = null;
partial = null;
return -1;
}
if (len >= size) {
// This is the only case that is zero-copy.
CodedOutputStream stream = CodedOutputStream.newInstance(b, off, size);
message.writeTo(stream);
stream.flush();
stream.checkNoSpaceLeft();
message = null;
partial = null;
return size;
}
partial = new ByteArrayInputStream(message.toByteArray());
message = null;
}
if (partial != null) {
return partial.read(b, off, len);
}
return -1;
}
@Override
public int available() throws IOException {
if (message != null) {
return message.getSerializedSize();
} else if (partial != null) {
return partial.available();
}
return 0;
}
MessageLite message() {
if (message == null) {
throw new IllegalStateException("message not available");
}
return message;
}
Parser<?> parser() {
return parser;
}
}
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