| /* |
| * 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); |
| } |
| } |