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	/*
	* Copyright (c) 2016, 2018, 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.consumer;

	import java.io.IOException;
	import java.util.ArrayList;
	import java.util.List;
	import java.util.Objects;

	import jdk.jfr.EventType;
	import jdk.jfr.ValueDescriptor;
	import jdk.jfr.internal.MetadataDescriptor;
	import jdk.jfr.internal.PrivateAccess;
	import jdk.jfr.internal.Type;
	import jdk.jfr.internal.consumer.RecordingInput;

	/**
	* Class that create parsers suitable for reading events and constant pools
	*/
	final class ParserFactory {
	private final LongMap<Parser> parsers = new LongMap<>();
	private final TimeConverter timeConverter;
	private final LongMap<Type> types = new LongMap<>();
	private final LongMap<ConstantMap> constantPools;

	public ParserFactory(MetadataDescriptor metadata, TimeConverter timeConverter) throws IOException {
	this.constantPools = new LongMap<>();
	this.timeConverter = timeConverter;
	for (Type t : metadata.getTypes()) {
	types.put(t.getId(), t);
	}
	for (Type t : types) {
	if (!t.getFields().isEmpty()) { // Avoid primitives
	CompositeParser cp = createCompositeParser(t);
	if (t.isSimpleType()) { // Reduce to nested parser
	parsers.put(t.getId(), cp.parsers[0]);
	}

	}
	}
	// Override event types with event parsers
	for (EventType t : metadata.getEventTypes()) {
	parsers.put(t.getId(), createEventParser(t));
	}
	}

	public LongMap<Parser> getParsers() {
	return parsers;
	}

	public LongMap<ConstantMap> getConstantPools() {
	return constantPools;
	}

	public LongMap<Type> getTypeMap() {
	return types;
	}

	private EventParser createEventParser(EventType eventType) throws IOException {
	List<Parser> parsers = new ArrayList<Parser>();
	for (ValueDescriptor f : eventType.getFields()) {
	parsers.add(createParser(f));
	}
	return new EventParser(timeConverter, eventType, parsers.toArray(new Parser[0]));
	}

	private Parser createParser(ValueDescriptor v) throws IOException {
	boolean constantPool = PrivateAccess.getInstance().isConstantPool(v);
	if (v.isArray()) {
	Type valueType = PrivateAccess.getInstance().getType(v);
	ValueDescriptor element = PrivateAccess.getInstance().newValueDescriptor(v.getName(), valueType, v.getAnnotationElements(), 0, constantPool, null);
	return new ArrayParser(createParser(element));
	}
	long id = v.getTypeId();
	Type type = types.get(id);
	if (type == null) {
	throw new IOException("Type '" + v.getTypeName() + "' is not defined");
	}
	if (constantPool) {
	ConstantMap pool = constantPools.get(id);
	if (pool == null) {
	pool = new ConstantMap(ObjectFactory.create(type, timeConverter), type.getName());
	constantPools.put(id, pool);
	}
	return new ConstantMapValueParser(pool);
	}
	Parser parser = parsers.get(id);
	if (parser == null) {
	if (!v.getFields().isEmpty()) {
	return createCompositeParser(type);
	} else {
	return registerParserType(type, createPrimitiveParser(type));
	}
	}
	return parser;
	}

	private Parser createPrimitiveParser(Type type) throws IOException {
	switch (type.getName()) {
	case "int":
	return new IntegerParser();
	case "long":
	return new LongParser();
	case "float":
	return new FloatParser();
	case "double":
	return new DoubleParser();
	case "char":
	return new CharacterParser();
	case "boolean":
	return new BooleanParser();
	case "short":
	return new ShortParser();
	case "byte":
	return new ByteParser();
	case "java.lang.String":
	ConstantMap pool = new ConstantMap(ObjectFactory.create(type, timeConverter), type.getName());
	constantPools.put(type.getId(), pool);
	return new StringParser(pool);
	default:
	throw new IOException("Unknown primitive type " + type.getName());
	}
	}

	private Parser registerParserType(Type t, Parser parser) {
	Parser p = parsers.get(t.getId());
	// check if parser exists (known type)
	if (p != null) {
	return p;
	}
	parsers.put(t.getId(), parser);
	return parser;
	}

	private CompositeParser createCompositeParser(Type type) throws IOException {
	List<ValueDescriptor> vds = type.getFields();
	Parser[] parsers = new Parser[vds.size()];
	CompositeParser composite = new CompositeParser(parsers);
	// need to pre-register so recursive types can be handled
	registerParserType(type, composite);

	int index = 0;
	for (ValueDescriptor vd : vds) {
	parsers[index++] = createParser(vd);
	}
	return composite;
	}

	private static final class BooleanParser extends Parser {
	@Override
	public Object parse(RecordingInput input) throws IOException {
	return input.readBoolean() ? Boolean.TRUE : Boolean.FALSE;
	}
	}

	private static final class ByteParser extends Parser {
	@Override
	public Object parse(RecordingInput input) throws IOException {
	return Byte.valueOf(input.readByte());
	}
	}

	private static final class LongParser extends Parser {
	@Override
	public Object parse(RecordingInput input) throws IOException {
	return Long.valueOf(input.readLong());
	}
	}

	private static final class IntegerParser extends Parser {
	@Override
	public Object parse(RecordingInput input) throws IOException {
	return Integer.valueOf(input.readInt());
	}
	}

	private static final class ShortParser extends Parser {
	@Override
	public Object parse(RecordingInput input) throws IOException {
	return Short.valueOf(input.readShort());
	}
	}

	private static final class CharacterParser extends Parser {
	@Override
	public Object parse(RecordingInput input) throws IOException {
	return Character.valueOf(input.readChar());
	}
	}

	private static final class FloatParser extends Parser {
	@Override
	public Object parse(RecordingInput input) throws IOException {
	return Float.valueOf(input.readFloat());
	}
	}

	private static final class DoubleParser extends Parser {
	@Override
	public Object parse(RecordingInput input) throws IOException {
	return Double.valueOf(input.readDouble());
	}
	}

	private static final class StringParser extends Parser {
	private final ConstantMap stringConstantMap;
	private String last;

	StringParser(ConstantMap stringConstantMap) {
	this.stringConstantMap = stringConstantMap;
	}

	@Override
	public Object parse(RecordingInput input) throws IOException {
	String s = parseEncodedString(input);
	if (!Objects.equals(s, last)) {
	last = s;
	}
	return last;
	}

	private String parseEncodedString(RecordingInput input) throws IOException {
	byte encoding = input.readByte();
	if (encoding == RecordingInput.STRING_ENCODING_CONSTANT_POOL) {
	long id = input.readLong();
	return (String) stringConstantMap.get(id);
	} else {
	return input.readEncodedString(encoding);
	}
	}
	}

	private final static class ArrayParser extends Parser {
	private final Parser elementParser;

	public ArrayParser(Parser elementParser) {
	this.elementParser = elementParser;
	}

	@Override
	public Object parse(RecordingInput input) throws IOException {
	final int size = input.readInt();
	final Object[] array = new Object[size];
	for (int i = 0; i < size; i++) {
	array[i] = elementParser.parse(input);
	}
	return array;
	}
	}

	private final static class CompositeParser extends Parser {
	private final Parser[] parsers;

	public CompositeParser(Parser[] valueParsers) {
	this.parsers = valueParsers;
	}

	@Override
	public Object parse(RecordingInput input) throws IOException {
	final Object[] values = new Object[parsers.length];
	for (int i = 0; i < values.length; i++) {
	values[i] = parsers[i].parse(input);
	}
	return values;
	}
	}

	private static final class ConstantMapValueParser extends Parser {
	private final ConstantMap pool;

	ConstantMapValueParser(ConstantMap pool) {
	this.pool = pool;
	}

	@Override
	public Object parse(RecordingInput input) throws IOException {
	return pool.get(input.readLong());
	}
	}
	}

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