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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.internal;

	import java.io.DataInput;
	import java.io.DataOutput;
	import java.io.IOException;
	import java.util.ArrayList;
	import java.util.Collection;
	import java.util.List;
	import java.util.Locale;
	import java.util.TimeZone;

	import jdk.jfr.EventType;

	/**
	* Metadata about a chunk
	*/
	public final class MetadataDescriptor {

	static final class Attribute {
	final String name;
	final String value;

	private Attribute(String name, String value) {
	this.name = name;
	this.value = value;
	}
	}

	static final class Element {
	final String name;
	final List<Element> elements = new ArrayList<>();
	final List<Attribute> attributes = new ArrayList<>();

	Element(String name) {
	this.name = name;
	}

	long longValue(String name) {
	String v = attribute(name);
	if (v != null)
	return Long.parseLong(v);
	else
	throw new IllegalArgumentException(name);
	}

	String attribute(String name) {
	for (Attribute a : attributes) {
	if (a.name.equals(name)) {
	return a.value;
	}
	}
	return null;
	}

	@Override
	public String toString() {
	StringBuilder sb = new StringBuilder();
	try {
	prettyPrintXML(sb, "", this);
	} catch (IOException e) {
	// should not happen
	}
	return sb.toString();
	}

	long attribute(String name, long defaultValue) {
	String text = attribute(name);
	if (text == null) {
	return defaultValue;
	}
	return Long.parseLong(text);
	}

	String attribute(String name, String defaultValue) {
	String text = attribute(name);
	if (text == null) {
	return defaultValue;
	}
	return text;
	}

	List<Element> elements(String... names) {
	List<Element> filteredElements = new ArrayList<>();
	for (String name : names) {
	for (Element e : elements) {
	if (e.name.equals(name)) {
	filteredElements.add(e);
	}
	}
	}
	return filteredElements;
	}

	void add(Element element) {
	elements.add(element);
	}

	void addAttribute(String name, Object value) {
	attributes.add(new Attribute(name, String.valueOf(value)));
	}

	Element newChild(String name) {
	Element e = new Element(name);
	elements.add(e);
	return e;
	}

	public void addArrayAttribute(Element element, String name, Object value) {
	String typeName = value.getClass().getComponentType().getName();
	switch (typeName) {
	case "int":
	int[] ints = (int[]) value;
	for (int i = 0; i < ints.length; i++) {
	addAttribute(name + "-" + i , ints[i]);
	}
	break;
	case "long":
	long[] longs = (long[]) value;
	for (int i = 0; i < longs.length; i++) {
	addAttribute(name + "-" + i , longs[i]);
	}
	break;
	case "float":
	float[] floats = (float[]) value;
	for (int i = 0; i < floats.length; i++) {
	addAttribute(name + "-" + i , floats[i]);
	}
	break;

	case "double":
	double[] doubles = (double[]) value;
	for (int i = 0; i < doubles.length; i++) {
	addAttribute(name + "-" + i , doubles[i]);
	}
	break;
	case "short":
	short[] shorts = (short[]) value;
	for (int i = 0; i < shorts.length; i++) {
	addAttribute(name + "-" + i , shorts[i]);
	}
	break;
	case "char":
	char[] chars = (char[]) value;
	for (int i = 0; i < chars.length; i++) {
	addAttribute(name + "-" + i , chars[i]);
	}
	break;
	case "byte":
	byte[] bytes = (byte[]) value;
	for (int i = 0; i < bytes.length; i++) {
	addAttribute(name + "-" + i , bytes[i]);
	}
	break;
	case "boolean":
	boolean[] booleans = (boolean[]) value;
	for (int i = 0; i < booleans.length; i++) {
	addAttribute(name + "-" + i , booleans[i]);
	}
	break;
	case "java.lang.String":
	String[] strings = (String[]) value;
	for (int i = 0; i < strings.length; i++) {
	addAttribute(name + "-" + i , strings[i]);
	}
	break;
	default:
	throw new InternalError("Array type of " + typeName + " is not supported");
	}
	}
	}

	static final String ATTRIBUTE_ID = "id";
	static final String ATTRIBUTE_SIMPLE_TYPE = "simpleType";
	static final String ATTRIBUTE_GMT_OFFSET = "gmtOffset";
	static final String ATTRIBUTE_LOCALE = "locale";
	static final String ELEMENT_TYPE = "class";
	static final String ELEMENT_SETTING = "setting";
	static final String ELEMENT_ANNOTATION = "annotation";
	static final String ELEMENT_FIELD = "field";
	static final String ATTRIBUTE_SUPER_TYPE = "superType";
	static final String ATTRIBUTE_TYPE_ID = "class";
	static final String ATTRIBUTE_DIMENSION = "dimension";
	static final String ATTRIBUTE_NAME = "name";
	static final String ATTRIBUTE_CONSTANT_POOL = "constantPool";
	static final String ATTRIBUTE_DEFAULT_VALUE = "defaultValue";

	final List<EventType> eventTypes = new ArrayList<>();
	final Collection<Type> types = new ArrayList<>();
	long gmtOffset;
	String locale;
	Element root;

	// package private
	MetadataDescriptor() {
	}

	private static void prettyPrintXML(Appendable sb, String indent, Element e) throws IOException {
	sb.append(indent + "<" + e.name);
	for (Attribute a : e.attributes) {
	sb.append(" ").append(a.name).append("=\"").append(a.value).append("\"");
	}
	if (e.elements.size() == 0) {
	sb.append("/");
	}
	sb.append(">\n");
	for (Element child : e.elements) {
	prettyPrintXML(sb, indent + " ", child);
	}
	if (e.elements.size() != 0) {
	sb.append(indent).append("</").append(e.name).append(">\n");
	}
	}

	public Collection<Type> getTypes() {
	return types;
	}

	public List<EventType> getEventTypes() {
	return eventTypes;
	}

	public int getGMTOffset() {
	return (int) gmtOffset;
	}

	public String getLocale() {
	return locale;
	}

	public static MetadataDescriptor read(DataInput input) throws IOException {
	MetadataReader r = new MetadataReader(input);
	return r.getDescriptor();
	}

	static void write(List<Type> types, DataOutput output) throws IOException {
	MetadataDescriptor m = new MetadataDescriptor();
	m.locale = Locale.getDefault().toString();
	m.gmtOffset = TimeZone.getDefault().getRawOffset();
	m.types.addAll(types);
	MetadataWriter w = new MetadataWriter(m);
	w.writeBinary(output);
	}

	@Override
	public String toString() {
	return root.toString();
	}
	}

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