Remove Unused ByteBufStreamInput (#56567)

We're not using this one any more.

modules/transport-netty4/src/main/java/org/elasticsearch/transport/netty4/ByteBufStreamInput.java

@@ -1,189 +0,0 @@
-/*
- * Licensed to Elasticsearch under one or more contributor
- * license agreements. See the NOTICE file distributed with
- * this work for additional information regarding copyright
- * ownership. Elasticsearch licenses this file to you under
- * the Apache License, Version 2.0 (the "License"); you may
- * not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *    http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing,
- * software distributed under the License is distributed on an
- * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
- * KIND, either express or implied.  See the License for the
- * specific language governing permissions and limitations
- * under the License.
- */
-
-package org.elasticsearch.transport.netty4;
-
-import io.netty.buffer.ByteBuf;
-import org.apache.lucene.util.BytesRef;
-import org.elasticsearch.common.bytes.BytesReference;
-import org.elasticsearch.common.io.stream.StreamInput;
-
-import java.io.EOFException;
-import java.io.IOException;
-
-/**
- * A Netty {@link ByteBuf} based {@link StreamInput}.
- */
-class ByteBufStreamInput extends StreamInput {
-
-    private final ByteBuf buffer;
-    private final int endIndex;
-
-    ByteBufStreamInput(ByteBuf buffer, int length) {
-        if (length > buffer.readableBytes()) {
-            throw new IndexOutOfBoundsException();
-        }
-        this.buffer = buffer;
-        int startIndex = buffer.readerIndex();
-        endIndex = startIndex + length;
-        buffer.markReaderIndex();
-    }
-
-    @Override
-    public BytesReference readBytesReference(int length) throws IOException {
-        // NOTE: It is unsafe to share a reference of the internal structure, so we
-        // use the default implementation which will copy the bytes. It is unsafe because
-        // a netty ByteBuf might be pooled which requires a manual release to prevent
-        // memory leaks.
-        return super.readBytesReference(length);
-    }
-
-    @Override
-    public BytesRef readBytesRef(int length) throws IOException {
-        // NOTE: It is unsafe to share a reference of the internal structure, so we
-        // use the default implementation which will copy the bytes. It is unsafe because
-        // a netty ByteBuf might be pooled which requires a manual release to prevent
-        // memory leaks.
-        return super.readBytesRef(length);
-    }
-
-    @Override
-    public int available() throws IOException {
-        return endIndex - buffer.readerIndex();
-    }
-
-    @Override
-    protected void ensureCanReadBytes(int length) throws EOFException {
-        int bytesAvailable = endIndex - buffer.readerIndex();
-        if (bytesAvailable < length) {
-            throw new EOFException("tried to read: " + length + " bytes but only " + bytesAvailable + " remaining");
-        }
-    }
-
-    @Override
-    public void mark(int readlimit) {
-        buffer.markReaderIndex();
-    }
-
-    @Override
-    public boolean markSupported() {
-        return true;
-    }
-
-    @Override
-    public int read() throws IOException {
-        if (available() == 0) {
-            return -1;
-        }
-        return buffer.readByte() & 0xff;
-    }
-
-    @Override
-    public int read(byte[] b, int off, int len) throws IOException {
-        if (len == 0) {
-            return 0;
-        }
-        int available = available();
-        if (available == 0) {
-            return -1;
-        }
-
-        len = Math.min(available, len);
-        buffer.readBytes(b, off, len);
-        return len;
-    }
-
-    @Override
-    public short readShort() throws IOException {
-        try {
-            return buffer.readShort();
-        } catch (IndexOutOfBoundsException ex) {
-            EOFException eofException = new EOFException();
-            eofException.initCause(ex);
-            throw eofException;
-        }
-    }
-
-    @Override
-    public int readInt() throws IOException {
-        try {
-            return buffer.readInt();
-        } catch (IndexOutOfBoundsException ex) {
-            EOFException eofException = new EOFException();
-            eofException.initCause(ex);
-            throw eofException;
-        }
-    }
-
-    @Override
-    public long readLong() throws IOException {
-        try {
-            return buffer.readLong();
-        } catch (IndexOutOfBoundsException ex) {
-            EOFException eofException = new EOFException();
-            eofException.initCause(ex);
-            throw eofException;
-        }
-    }
-
-    @Override
-    public void reset() throws IOException {
-        buffer.resetReaderIndex();
-    }
-
-    @Override
-    public long skip(long n) throws IOException {
-        if (n > Integer.MAX_VALUE) {
-            return skipBytes(Integer.MAX_VALUE);
-        } else {
-            return skipBytes((int) n);
-        }
-    }
-
-    public int skipBytes(int n) throws IOException {
-        int nBytes = Math.min(available(), n);
-        buffer.skipBytes(nBytes);
-        return nBytes;
-    }
-
-
-    @Override
-    public byte readByte() throws IOException {
-        try {
-            return buffer.readByte();
-        } catch (IndexOutOfBoundsException ex) {
-            EOFException eofException = new EOFException();
-            eofException.initCause(ex);
-            throw eofException;
-        }
-    }
-
-    @Override
-    public void readBytes(byte[] b, int offset, int len) throws IOException {
-        int read = read(b, offset, len);
-        if (read < len) {
-            throw new IndexOutOfBoundsException();
-        }
-    }
-
-    @Override
-    public void close() throws IOException {
-        // nothing to do here
-    }
-}