diff -r 2c3cc4b01880 -r c16ac7a2eba4 src/jdk.jfr/share/classes/jdk/jfr/internal/consumer/StringParser.java --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/jdk.jfr/share/classes/jdk/jfr/internal/consumer/StringParser.java Wed Oct 30 19:43:52 2019 +0100 @@ -0,0 +1,222 @@ +/* + * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. Oracle designates this + * particular file as subject to the "Classpath" exception as provided + * by Oracle in the LICENSE file that accompanied this code. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + */ + +package jdk.jfr.internal.consumer; + +import java.io.IOException; +import java.nio.charset.Charset; + +public final class StringParser extends Parser { + + public enum Encoding { + NULL(0), + EMPTY_STRING(1), + CONSTANT_POOL(2), + UT8_BYTE_ARRAY(3), + CHAR_ARRAY(4), + LATIN1_BYTE_ARRAY(5); + + private byte byteValue; + + private Encoding(int byteValue) { + this.byteValue = (byte) byteValue; + } + + public byte byteValue() { + return byteValue; + } + + public boolean is(byte value) { + return value == byteValue; + } + + } + private final static Charset UTF8 = Charset.forName("UTF-8"); + private final static Charset LATIN1 = Charset.forName("ISO-8859-1"); + + private final static class CharsetParser extends Parser { + private final Charset charset; + private int lastSize; + private byte[] buffer = new byte[16]; + private String lastString; + + CharsetParser(Charset charset) { + this.charset = charset; + } + + @Override + public Object parse(RecordingInput input) throws IOException { + int size = input.readInt(); + ensureSize(size); + if (lastSize == size) { + boolean equalsLastString = true; + for (int i = 0; i < size; i++) { + // TODO: No need to read byte per byte + byte b = input.readByte(); + if (buffer[i] != b) { + equalsLastString = false; + buffer[i] = b; + } + } + if (equalsLastString) { + return lastString; + } + } else { + for (int i = 0; i < size; i++) { + buffer[i] = input.readByte(); + } + } + lastString = new String(buffer, 0, size, charset); + lastSize = size; + return lastString; + } + + @Override + public void skip(RecordingInput input) throws IOException { + int size = input.readInt(); + input.skipBytes(size); + } + + private void ensureSize(int size) { + if (buffer.length < size) { + buffer = new byte[size]; + } + } + } + + private final static class CharArrayParser extends Parser { + private char[] buffer = new char[16]; + private int lastSize = -1; + private String lastString = null; + + @Override + public Object parse(RecordingInput input) throws IOException { + int size = input.readInt(); + ensureSize(size); + if (lastSize == size) { + boolean equalsLastString = true; + for (int i = 0; i < size; i++) { + char c = input.readChar(); + if (buffer[i] != c) { + equalsLastString = false; + buffer[i] = c; + } + } + if (equalsLastString) { + return lastString; + } + } else { + for (int i = 0; i < size; i++) { + buffer[i] = input.readChar(); + } + } + lastString = new String(buffer, 0, size); + lastSize = size; + return lastString; + } + + @Override + public void skip(RecordingInput input) throws IOException { + int size = input.readInt(); + for (int i = 0; i < size; i++) { + input.readChar(); + } + } + + private void ensureSize(int size) { + if (buffer.length < size) { + buffer = new char[size]; + } + } + } + + private final ConstantLookup stringLookup; + private final CharArrayParser charArrayParser = new CharArrayParser(); + private final CharsetParser utf8parser = new CharsetParser(UTF8); + private final CharsetParser latin1parser = new CharsetParser(LATIN1); + private final boolean event; + + public StringParser(ConstantLookup stringLookup, boolean event) { + this.stringLookup = stringLookup; + this.event = event; + } + + @Override + public Object parse(RecordingInput input) throws IOException { + byte encoding = input.readByte(); + if (Encoding.CONSTANT_POOL.is(encoding)) { + long key = input.readLong(); + if (event) { + return stringLookup.getCurrentResolved(key); + } else { + return stringLookup.getCurrent(key); + } + } + if (Encoding.NULL.is(encoding)) { + return null; + } + if (Encoding.EMPTY_STRING.is(encoding)) { + return ""; + } + if (Encoding.CHAR_ARRAY.is(encoding)) { + return charArrayParser.parse(input); + } + if (Encoding.UT8_BYTE_ARRAY.is(encoding)) { + return utf8parser.parse(input); + } + if (Encoding.LATIN1_BYTE_ARRAY.is(encoding)) { + return latin1parser.parse(input); + } + throw new IOException("Unknown string encoding " + encoding); + } + + @Override + public void skip(RecordingInput input) throws IOException { + byte encoding = input.readByte(); + if (Encoding.CONSTANT_POOL.is(encoding)) { + input.readLong(); + return; + } + if (Encoding.EMPTY_STRING.is(encoding)) { + return; + } + if (Encoding.NULL.is(encoding)) { + return; + } + if (Encoding.CHAR_ARRAY.is(encoding)) { + charArrayParser.skip(input); + return; + } + if (Encoding.UT8_BYTE_ARRAY.is(encoding)) { + utf8parser.skip(input); + return; + } + if (Encoding.LATIN1_BYTE_ARRAY.is(encoding)) { + latin1parser.skip(input); + return; + } + throw new IOException("Unknown string encoding " + encoding); + } +}