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Introduce ClickHouseInputStream for tiny reads
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95 changes: 95 additions & 0 deletions
95
clickhouse-client/src/main/java/com/clickhouse/client/ClickHouseInputStream.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,95 @@ | ||
| package com.clickhouse.client; | ||
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| import java.io.EOFException; | ||
| import java.io.IOException; | ||
| import java.io.InputStream; | ||
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| /** | ||
| * Extended input stream. | ||
| */ | ||
| public abstract class ClickHouseInputStream extends InputStream { | ||
| static final class SimpleInputStream extends ClickHouseInputStream { | ||
| private final InputStream in; | ||
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| private boolean closed; | ||
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| protected SimpleInputStream(InputStream input) { | ||
| this.in = ClickHouseChecker.nonNull(input, "InputStream"); | ||
| this.closed = false; | ||
| } | ||
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| @Override | ||
| public int available() throws IOException { | ||
| return in.available(); | ||
| } | ||
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| @Override | ||
| public byte readByte() throws IOException { | ||
| int v = in.read(); | ||
| if (v == -1) { | ||
| close(); | ||
| throw new EOFException(); | ||
| } | ||
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| return (byte) v; | ||
| } | ||
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| @Override | ||
| public boolean isClosed() { | ||
| return closed; | ||
| } | ||
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| @Override | ||
| public void close() throws IOException { | ||
| in.close(); | ||
| closed = true; | ||
| } | ||
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| @Override | ||
| public int read() throws IOException { | ||
| return in.read(); | ||
| } | ||
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| @Override | ||
| public int read(byte[] b, int off, int len) throws IOException { | ||
| return in.read(b, off, len); | ||
| } | ||
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| @Override | ||
| public long skip(long n) throws IOException { | ||
| return in.skip(n); | ||
| } | ||
| } | ||
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| public static ClickHouseInputStream of(InputStream input) { | ||
| return input instanceof ClickHouseInputStream ? (ClickHouseInputStream) input : new SimpleInputStream(input); | ||
| } | ||
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| /** | ||
| * Reads an unsigned byte from the input stream. | ||
| * | ||
| * @return unsigned byte | ||
| * @throws IOException when failed to read value from input stream or reached | ||
| * end of the stream | ||
| */ | ||
| public int readUnsignedByte() throws IOException { | ||
| return 0xFF & readByte(); | ||
| } | ||
|
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| /** | ||
| * Reads one single byte from the input stream. This is faster than | ||
| * {@link #read()}. | ||
| * | ||
| * @return byte value if present | ||
| * @throws IOException when failed to read value from input stream or reached | ||
| * end of the stream | ||
| */ | ||
| public abstract byte readByte() throws IOException; | ||
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| /** | ||
| * Checks if the input stream has been closed or not. | ||
| * | ||
| * @return true if the input stream has been closed; false otherwise | ||
| */ | ||
| public abstract boolean isClosed(); | ||
| } |
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