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/*******************************************************************************
* Copyright (c) 2009, 2019 Mountainminds GmbH & Co. KG and Contributors
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Marc R. Hoffmann - initial API and implementation
*
*******************************************************************************/
package org.jacoco.core.data;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import org.jacoco.core.internal.data.CompactDataOutput;
/**
* Serialization of execution data into binary streams.
*/
public class ExecutionDataWriter implements ISessionInfoVisitor,
IExecutionDataVisitor {
/** File format version, will be incremented for each incompatible change. */
public static final char FORMAT_VERSION;
static {
// Runtime initialize to ensure javac does not inline the value.
FORMAT_VERSION = 0x1007;
}
/** Magic number in header for file format identification. */
public static final char MAGIC_NUMBER = 0xC0C0;
/** Block identifier for file headers. */
public static final byte BLOCK_HEADER = 0x01;
/** Block identifier for session information. */
public static final byte BLOCK_SESSIONINFO = 0x10;
/** Block identifier for execution data of a single class. */
public static final byte BLOCK_EXECUTIONDATA = 0x11;
/** Underlying data output */
protected final CompactDataOutput out;
/**
* Creates a new writer based on the given output stream. Depending on the
* nature of the underlying stream output should be buffered as most data is
* written in single bytes.
*
* @param output
* binary stream to write execution data to
* @throws IOException
* if the header can't be written
*/
public ExecutionDataWriter(final OutputStream output) throws IOException {
this.out = new CompactDataOutput(output);
writeHeader();
}
/**
* Writes an file header to identify the stream and its protocol version.
*
* @throws IOException
* if the header can't be written
*/
private void writeHeader() throws IOException {
out.writeByte(BLOCK_HEADER);
out.writeChar(MAGIC_NUMBER);
out.writeChar(FORMAT_VERSION);
}
/**
* Flushes the underlying stream.
*
* @throws IOException
* if the underlying stream can't be flushed
*/
public void flush() throws IOException {
out.flush();
}
public void visitSessionInfo(final SessionInfo info) {
try {
out.writeByte(BLOCK_SESSIONINFO);
out.writeUTF(info.getId());
out.writeLong(info.getStartTimeStamp());
out.writeLong(info.getDumpTimeStamp());
} catch (final IOException e) {
throw new RuntimeException(e);
}
}
public void visitClassExecution(final ExecutionData data) {
if (data.hasHits()) {
try {
out.writeByte(BLOCK_EXECUTIONDATA);
out.writeLong(data.getId());
out.writeUTF(data.getName());
out.writeBooleanArray(data.getProbes());
} catch (final IOException e) {
throw new RuntimeException(e);
}
}
}
/**
* Returns the first bytes of a file that represents a valid execution data
* file. In any case every execution data file starts with the three bytes
* <code>0x01 0xC0 0xC0</code>.
*
* @return first bytes of a execution data file
*/
public static final byte[] getFileHeader() {
final ByteArrayOutputStream buffer = new ByteArrayOutputStream();
try {
new ExecutionDataWriter(buffer);
} catch (final IOException e) {
// Must not happen with ByteArrayOutputStream
throw new AssertionError(e);
}
return buffer.toByteArray();
}
}
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