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	/*
	* Copyright (c) 2015, 2017, 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.internal.module;

	import java.lang.module.ModuleDescriptor;
	import java.lang.module.ModuleDescriptor.Exports;
	import java.lang.module.ModuleDescriptor.Opens;
	import java.lang.module.ModuleDescriptor.Provides;
	import java.lang.module.ModuleDescriptor.Requires;
	import java.lang.module.ModuleDescriptor.Version;
	import java.util.Collections;
	import java.util.List;
	import java.util.Set;

	import jdk.internal.misc.JavaLangModuleAccess;
	import jdk.internal.misc.SharedSecrets;

	/**
	* This builder is optimized for reconstituting the {@code ModuleDescriptor}s
	* for system modules. The validation should be done at jlink time.
	*
	* 1. skip name validation
	* 2. ignores dependency hashes.
	* 3. ModuleDescriptor skips the defensive copy and directly uses the
	* sets/maps created in this Builder.
	*
	* SystemModules should contain modules for the boot layer.
	*/
	final class Builder {
	private static final JavaLangModuleAccess JLMA =
	SharedSecrets.getJavaLangModuleAccess();

	// Static cache of the most recently seen Version to cheaply deduplicate
	// most Version objects. JDK modules have the same version.
	static Version cachedVersion;

	/**
	* Returns a {@link Requires} for a dependence on a module with the given
	* (and possibly empty) set of modifiers, and optionally the version
	* recorded at compile time.
	*/
	public static Requires newRequires(Set<Requires.Modifier> mods,
	String mn,
	String compiledVersion)
	{
	Version version = null;
	if (compiledVersion != null) {
	// use the cached version if the same version string
	Version ver = cachedVersion;
	if (ver != null && compiledVersion.equals(ver.toString())) {
	version = ver;
	} else {
	version = Version.parse(compiledVersion);
	}
	}
	return JLMA.newRequires(mods, mn, version);
	}

	/**
	* Returns a {@link Requires} for a dependence on a module with the given
	* (and possibly empty) set of modifiers, and optionally the version
	* recorded at compile time.
	*/
	public static Requires newRequires(Set<Requires.Modifier> mods,
	String mn)
	{
	return newRequires(mods, mn, null);
	}

	/**
	* Returns a {@link Exports} for a qualified export, with
	* the given (and possibly empty) set of modifiers,
	* to a set of target modules.
	*/
	public static Exports newExports(Set<Exports.Modifier> ms,
	String pn,
	Set<String> targets) {
	return JLMA.newExports(ms, pn, targets);
	}

	/**
	* Returns an {@link Opens} for an unqualified open with a given set of
	* modifiers.
	*/
	public static Opens newOpens(Set<Opens.Modifier> ms, String pn) {
	return JLMA.newOpens(ms, pn);
	}

	/**
	* Returns an {@link Opens} for a qualified opens, with
	* the given (and possibly empty) set of modifiers,
	* to a set of target modules.
	*/
	public static Opens newOpens(Set<Opens.Modifier> ms,
	String pn,
	Set<String> targets) {
	return JLMA.newOpens(ms, pn, targets);
	}

	/**
	* Returns a {@link Exports} for an unqualified export with a given set
	* of modifiers.
	*/
	public static Exports newExports(Set<Exports.Modifier> ms, String pn) {
	return JLMA.newExports(ms, pn);
	}

	/**
	* Returns a {@link Provides} for a service with a given list of
	* implementation classes.
	*/
	public static Provides newProvides(String st, List<String> pcs) {
	return JLMA.newProvides(st, pcs);
	}

	final String name;
	boolean open, synthetic, mandated;
	Set<Requires> requires;
	Set<Exports> exports;
	Set<Opens> opens;
	Set<String> packages;
	Set<String> uses;
	Set<Provides> provides;
	Version version;
	String mainClass;

	Builder(String name) {
	this.name = name;
	this.requires = Collections.emptySet();
	this.exports = Collections.emptySet();
	this.opens = Collections.emptySet();
	this.provides = Collections.emptySet();
	this.uses = Collections.emptySet();
	}

	Builder open(boolean value) {
	this.open = value;
	return this;
	}

	Builder synthetic(boolean value) {
	this.synthetic = value;
	return this;
	}

	Builder mandated(boolean value) {
	this.mandated = value;
	return this;
	}

	/**
	* Sets module exports.
	*/
	public Builder exports(Exports[] exports) {
	this.exports = Set.of(exports);
	return this;
	}

	/**
	* Sets module opens.
	*/
	public Builder opens(Opens[] opens) {
	this.opens = Set.of(opens);
	return this;
	}

	/**
	* Sets module requires.
	*/
	public Builder requires(Requires[] requires) {
	this.requires = Set.of(requires);
	return this;
	}

	/**
	* Adds a set of (possible empty) packages.
	*/
	public Builder packages(Set<String> packages) {
	this.packages = packages;
	return this;
	}

	/**
	* Sets the set of service dependences.
	*/
	public Builder uses(Set<String> uses) {
	this.uses = uses;
	return this;
	}

	/**
	* Sets module provides.
	*/
	public Builder provides(Provides[] provides) {
	this.provides = Set.of(provides);
	return this;
	}

	/**
	* Sets the module version.
	*
	* @throws IllegalArgumentException if {@code v} is null or cannot be
	* parsed as a version string
	*
	* @see Version#parse(String)
	*/
	public Builder version(String v) {
	Version ver = cachedVersion;
	if (ver != null && v.equals(ver.toString())) {
	version = ver;
	} else {
	cachedVersion = version = Version.parse(v);
	}
	return this;
	}

	/**
	* Sets the module main class.
	*/
	public Builder mainClass(String mc) {
	mainClass = mc;
	return this;
	}

	/**
	* Returns an immutable set of the module modifiers derived from the flags.
	*/
	private Set<ModuleDescriptor.Modifier> modifiers() {
	int n = 0;
	if (open) n++;
	if (synthetic) n++;
	if (mandated) n++;
	if (n == 0) {
	return Collections.emptySet();
	} else {
	ModuleDescriptor.Modifier[] mods = new ModuleDescriptor.Modifier[n];
	if (open) mods[--n] = ModuleDescriptor.Modifier.OPEN;
	if (synthetic) mods[--n] = ModuleDescriptor.Modifier.SYNTHETIC;
	if (mandated) mods[--n] = ModuleDescriptor.Modifier.MANDATED;
	return Set.of(mods);
	}
	}

	/**
	* Builds a {@code ModuleDescriptor} from the components.
	*/
	public ModuleDescriptor build(int hashCode) {
	assert name != null;
	return JLMA.newModuleDescriptor(name,
	version,
	modifiers(),
	requires,
	exports,
	opens,
	uses,
	provides,
	packages,
	mainClass,
	hashCode);
	}
	}

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