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Sometimes an actual file is needed, but sometimes it's not. In the case where it isn't, we can use an in-memory `InputFile`, `OutputFile` implementation.
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130 changes: 130 additions & 0 deletions
130
core/src/test/java/org/apache/iceberg/io/InMemoryInputFile.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,130 @@ | ||
| /* | ||
| * Licensed to the Apache Software Foundation (ASF) under one | ||
| * or more contributor license agreements. See the NOTICE file | ||
| * distributed with this work for additional information | ||
| * regarding copyright ownership. The ASF 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. | ||
| */ | ||
|
|
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| package org.apache.iceberg.io; | ||
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| import java.io.ByteArrayInputStream; | ||
| import java.io.IOException; | ||
| import java.util.Objects; | ||
| import java.util.UUID; | ||
| import org.apache.iceberg.relocated.com.google.common.base.Preconditions; | ||
|
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| public class InMemoryInputFile implements InputFile { | ||
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| private final String location; | ||
| private final byte[] contents; | ||
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| public InMemoryInputFile(byte[] contents) { | ||
| this("memory:" + UUID.randomUUID(), contents); | ||
| } | ||
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| public InMemoryInputFile(String location, byte[] contents) { | ||
| this.location = Objects.requireNonNull(location, "location is null"); | ||
| this.contents = Objects.requireNonNull(contents, "contents is null").clone(); | ||
| } | ||
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| @Override | ||
| public long getLength() { | ||
| return contents.length; | ||
| } | ||
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| @Override | ||
| public SeekableInputStream newStream() { | ||
| return new InMemorySeekableInputStream(contents); | ||
| } | ||
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| @Override | ||
| public String location() { | ||
| return location; | ||
| } | ||
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| @Override | ||
| public boolean exists() { | ||
| return true; | ||
| } | ||
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| private static class InMemorySeekableInputStream extends SeekableInputStream { | ||
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| private final int length; | ||
| private final ByteArrayInputStream delegate; | ||
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| InMemorySeekableInputStream(byte[] contents) { | ||
| this.length = contents.length; | ||
| this.delegate = new ByteArrayInputStream(contents); | ||
| } | ||
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| @Override | ||
| public long getPos() throws IOException { | ||
| return length - delegate.available(); | ||
| } | ||
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| @Override | ||
| public void seek(long newPos) throws IOException { | ||
| delegate.reset(); | ||
| Preconditions.checkState(delegate.skip(newPos) == newPos, | ||
| "Invalid position %s within stream of length %s", newPos, length); | ||
| } | ||
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| @Override | ||
| public int read() { | ||
| return delegate.read(); | ||
| } | ||
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| @Override | ||
| public int read(byte[] b) throws IOException { | ||
| return delegate.read(b); | ||
| } | ||
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| @Override | ||
| public int read(byte[] b, int off, int len) { | ||
| return delegate.read(b, off, len); | ||
| } | ||
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| @Override | ||
| public long skip(long n) { | ||
| return delegate.skip(n); | ||
| } | ||
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| @Override | ||
| public int available() { | ||
| return delegate.available(); | ||
| } | ||
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| @Override | ||
| public boolean markSupported() { | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
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| @Override | ||
| public void mark(int readAheadLimit) { | ||
| // We use mark to implement seek | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
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| @Override | ||
| public void reset() { | ||
| delegate.reset(); | ||
| } | ||
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| @Override | ||
| public void close() throws IOException { | ||
| delegate.close(); | ||
| } | ||
| } | ||
| } |
108 changes: 108 additions & 0 deletions
108
core/src/test/java/org/apache/iceberg/io/InMemoryOutputFile.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,108 @@ | ||
| /* | ||
| * Licensed to the Apache Software Foundation (ASF) under one | ||
| * or more contributor license agreements. See the NOTICE file | ||
| * distributed with this work for additional information | ||
| * regarding copyright ownership. The ASF 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. | ||
| */ | ||
|
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| package org.apache.iceberg.io; | ||
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| import java.io.ByteArrayOutputStream; | ||
| import java.io.IOException; | ||
| import java.util.Objects; | ||
| import java.util.UUID; | ||
|
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| public class InMemoryOutputFile implements OutputFile { | ||
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| private final String location; | ||
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| private boolean exists; | ||
| private ByteArrayOutputStream contents; | ||
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| public InMemoryOutputFile() { | ||
| this("memory:" + UUID.randomUUID()); | ||
| } | ||
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| public InMemoryOutputFile(String location) { | ||
| this.location = Objects.requireNonNull(location, "location is null"); | ||
| } | ||
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| @Override | ||
| public PositionOutputStream create() { | ||
| if (exists) { | ||
| throw new RuntimeException("Already exists"); | ||
| } | ||
| return createOrOverwrite(); | ||
| } | ||
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| @Override | ||
| public PositionOutputStream createOrOverwrite() { | ||
| exists = true; | ||
| contents = new ByteArrayOutputStream(); | ||
| return new InMemoryPositionOutputStream(contents); | ||
| } | ||
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| @Override | ||
| public String location() { | ||
| return location; | ||
| } | ||
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| @Override | ||
| public InputFile toInputFile() { | ||
| return new InMemoryInputFile(location(), getContents()); | ||
| } | ||
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| public byte[] getContents() { | ||
| return contents.toByteArray(); | ||
| } | ||
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| private static class InMemoryPositionOutputStream extends PositionOutputStream { | ||
| private final ByteArrayOutputStream delegate; | ||
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| InMemoryPositionOutputStream(ByteArrayOutputStream delegate) { | ||
| this.delegate = Objects.requireNonNull(delegate, "delegate is null"); | ||
| } | ||
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| @Override | ||
| public long getPos() { | ||
| return delegate.size(); | ||
| } | ||
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| @Override | ||
| public void write(int b) { | ||
| delegate.write(b); | ||
| } | ||
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| @Override | ||
| public void write(byte[] b) throws IOException { | ||
| delegate.write(b); | ||
| } | ||
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| @Override | ||
| public void write(byte[] b, int off, int len) { | ||
| delegate.write(b, off, len); | ||
| } | ||
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| @Override | ||
| public void flush() throws IOException { | ||
| delegate.flush(); | ||
| } | ||
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| @Override | ||
| public void close() throws IOException { | ||
| delegate.close(); | ||
| } | ||
| } | ||
| } |