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Avoid temporary String object creation in StreamMessageProducer
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101 changes: 101 additions & 0 deletions
101
...clipse.lsp4j.jsonrpc/src/main/java/org/eclipse/lsp4j/jsonrpc/util/LimitedInputStream.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,101 @@ | ||
| /****************************************************************************** | ||
| * Copyright (c) 2024 Sebastian Thomschke and others. | ||
| * | ||
| * This program and the accompanying materials are made available under the | ||
| * terms of the Eclipse Public License v. 2.0 which is available at | ||
| * http://www.eclipse.org/legal/epl-2.0, | ||
| * or the Eclipse Distribution License v. 1.0 which is available at | ||
| * http://www.eclipse.org/org/documents/edl-v10.php. | ||
| * | ||
| * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause | ||
| ******************************************************************************/ | ||
| package org.eclipse.lsp4j.jsonrpc.util; | ||
|
|
||
| import java.io.FilterInputStream; | ||
| import java.io.IOException; | ||
| import java.io.InputStream; | ||
|
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| public class LimitedInputStream extends FilterInputStream { | ||
| private static final int EOF = -1; | ||
|
|
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| private int bytesRemaining; | ||
| private final boolean closeWrapped; | ||
| private boolean isClosed; | ||
| private int mark = EOF; | ||
|
|
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| /** | ||
| * @param closeWrapped controls if the underlying {@link InputStream} should also be closed via {@link #close()} | ||
| */ | ||
| public LimitedInputStream(final InputStream wrapped, final int maxBytesToRead, final boolean closeWrapped) { | ||
| super(wrapped); | ||
| if (maxBytesToRead < 0) | ||
| throw new IllegalArgumentException("[maxBytesToRead] must be >= 0"); | ||
| bytesRemaining = maxBytesToRead; | ||
| this.closeWrapped = closeWrapped; | ||
| } | ||
|
|
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| @Override | ||
| public int available() throws IOException { | ||
| if (isClosed) | ||
| return 0; | ||
| final int availableBytes = in.available(); | ||
| return Math.min(availableBytes, bytesRemaining); | ||
| } | ||
|
|
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| @Override | ||
| public void close() throws IOException { | ||
| if (closeWrapped) { | ||
| in.close(); | ||
| } | ||
| isClosed = true; | ||
| } | ||
|
|
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| @Override | ||
| public int read() throws IOException { | ||
| if (isClosed || bytesRemaining < 1) | ||
| return EOF; | ||
|
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| final int data = in.read(); | ||
| if (data != EOF) { | ||
| bytesRemaining--; | ||
| } | ||
| return data; | ||
| } | ||
|
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| @Override | ||
| public int read(final byte[] b, final int off, final int len) throws IOException { | ||
| if (isClosed || bytesRemaining < 1) | ||
| return EOF; | ||
|
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| final int bytesRead = in.read(b, off, Math.min(len, bytesRemaining)); | ||
| if (bytesRead != EOF) { | ||
| bytesRemaining -= bytesRead; | ||
| } | ||
| return bytesRead; | ||
| } | ||
|
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| @Override | ||
| public synchronized void mark(final int readlimit) { | ||
| in.mark(readlimit); | ||
| mark = bytesRemaining; | ||
| } | ||
|
|
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| @Override | ||
| public synchronized void reset() throws IOException { | ||
| if (!in.markSupported()) | ||
| throw new IOException("mark/reset not supported"); | ||
|
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| if (mark == EOF) | ||
| throw new IOException("mark not set"); | ||
|
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| in.reset(); | ||
| bytesRemaining = mark; | ||
| } | ||
|
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| @Override | ||
| public long skip(final long n) throws IOException { | ||
| final long skipped = in.skip(Math.min(n, bytesRemaining)); | ||
| bytesRemaining -= skipped; | ||
| return skipped; | ||
| } | ||
| } |