/*
 * Copyright (c) 2000, 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.javadoc.internal.tool;


import java.util.*;

import javax.lang.model.element.Element;
import javax.lang.model.element.TypeElement;
import javax.lang.model.util.Elements;
import javax.tools.JavaFileManager;
import javax.tools.JavaFileObject;
import javax.tools.JavaFileObject.Kind;

import com.sun.source.util.DocTrees;
import com.sun.source.util.TreePath;
import com.sun.tools.javac.api.JavacTrees;
import com.sun.tools.javac.code.ClassFinder;
import com.sun.tools.javac.code.Flags;
import com.sun.tools.javac.code.Source;
import com.sun.tools.javac.code.Symbol;
import com.sun.tools.javac.code.Symbol.ClassSymbol;
import com.sun.tools.javac.code.Symbol.CompletionFailure;
import com.sun.tools.javac.code.Symbol.ModuleSymbol;
import com.sun.tools.javac.code.Symtab;
import com.sun.tools.javac.comp.AttrContext;
import com.sun.tools.javac.comp.Check;
import com.sun.tools.javac.comp.Enter;
import com.sun.tools.javac.comp.Env;
import com.sun.tools.javac.file.JavacFileManager;
import com.sun.tools.javac.model.JavacElements;
import com.sun.tools.javac.model.JavacTypes;
import com.sun.tools.javac.tree.JCTree;
import com.sun.tools.javac.tree.JCTree.JCClassDecl;
import com.sun.tools.javac.tree.JCTree.JCCompilationUnit;
import com.sun.tools.javac.tree.JCTree.JCPackageDecl;
import com.sun.tools.javac.util.Context;
import com.sun.tools.javac.util.Convert;
import com.sun.tools.javac.util.Name;
import com.sun.tools.javac.util.Names;

Holds the environment for a run of javadoc.
Holds only the information needed throughout the
run and not the compiler info that could be GC'ed
or ported.
 
This is NOT part of any supported API.
 If you write code that depends on this, you do so at your own risk.
 This code and its internal interfaces are subject to change or
 deletion without notice.
/**
 * Holds the environment for a run of javadoc.
 * Holds only the information needed throughout the
 * run and not the compiler info that could be GC'ed
 * or ported.
 *
 *  <p><b>This is NOT part of any supported API.
 *  If you write code that depends on this, you do so at your own risk.
 *  This code and its internal interfaces are subject to change or
 *  deletion without notice.</b>
 */
public class ToolEnvironment {
    protected static final Context.Key<ToolEnvironment> ToolEnvKey = new Context.Key<>();

    public static ToolEnvironment instance(Context context) {
        ToolEnvironment instance = context.get(ToolEnvKey);
        if (instance == null)
            instance = new ToolEnvironment(context);
        return instance;
    }

    final Messager messager;

    
Predefined symbols known to the compiler. /** Predefined symbols known to the compiler. */
    public final Symtab syms;

    
Referenced directly in RootDocImpl. /** Referenced directly in RootDocImpl. */
    private final ClassFinder finder;

    
Javadoc's own version of the compiler's enter phase. /** Javadoc's own version of the compiler's enter phase. */
    final Enter enter;

    
The name table. /** The name table. */
    private Names names;

    final Symbol externalizableSym;

    
If true, prevent printing of any notifications. /** If true, prevent printing of any notifications. */
    boolean quiet = false;

    
If true, ignore all errors encountered during Enter. /** If true, ignore all errors encountered during Enter. */
    boolean ignoreSourceErrors = false;

    Check chk;
    com.sun.tools.javac.code.Types types;
    JavaFileManager fileManager;
    public final Context context;

    WeakHashMap<JCTree, TreePath> treePaths = new WeakHashMap<>();

    
Allow documenting from class files? /** Allow documenting from class files? */
    boolean docClasses = false;

    
The source language version.
/**
     * The source language version.
     */
    public final Source source;

    public final Elements elements;

    public final JavacTypes typeutils;

    protected DocEnvImpl docEnv;

    public final DocTrees docTrees;

    public final Map<Element, TreePath> elementToTreePath;

    
Constructor
Params:
context –      Context for this javadoc instance./**
     * Constructor
     *
     * @param context      Context for this javadoc instance.
     */
    protected ToolEnvironment(Context context) {
        context.put(ToolEnvKey, this);
        this.context = context;

        messager = Messager.instance0(context);
        syms = Symtab.instance(context);
        finder = JavadocClassFinder.instance(context);
        enter = JavadocEnter.instance(context);
        names = Names.instance(context);
        externalizableSym = syms.enterClass(syms.java_base, names.fromString("java.io.Externalizable"));
        chk = Check.instance(context);
        types = com.sun.tools.javac.code.Types.instance(context);
        fileManager = context.get(JavaFileManager.class);
        if (fileManager instanceof JavacFileManager) {
            ((JavacFileManager)fileManager).setSymbolFileEnabled(false);
        }
        docTrees = JavacTrees.instance(context);
        source = Source.instance(context);
        elements =  JavacElements.instance(context);
        typeutils = JavacTypes.instance(context);
        elementToTreePath = new HashMap<>();
    }

    public void initialize(Map<ToolOption, Object> toolOpts) {
        this.quiet = (boolean)toolOpts.getOrDefault(ToolOption.QUIET, false);
        this.ignoreSourceErrors = (boolean)toolOpts.getOrDefault(ToolOption.IGNORE_SOURCE_ERRORS, false);
    }

    
Load a class by qualified name.
/**
     * Load a class by qualified name.
     */
    public TypeElement loadClass(String name) {
        try {
            Name nameImpl = names.fromString(name);
            ModuleSymbol mod = syms.inferModule(Convert.packagePart(nameImpl));
            ClassSymbol c = finder.loadClass(mod != null ? mod : syms.errModule, nameImpl);
            return c;
        } catch (CompletionFailure ex) {
            chk.completionError(null, ex);
            return null;
        }
    }

    boolean isSynthetic(Symbol sym) {
        return (sym.flags() & Flags.SYNTHETIC) != 0;
    }

    void setElementToTreePath(Element e, TreePath tree) {
        if (e == null || tree == null)
            return;
        elementToTreePath.put(e, tree);
    }

    public Kind getFileKind(TypeElement te) {
        JavaFileObject jfo = ((ClassSymbol)te).outermostClass().classfile;
        return jfo == null ? Kind.SOURCE : jfo.getKind();
    }

    
Print a notice, iff quiet is not specified.
Params:
key – selects message from resource/**
     * Print a notice, iff <em>quiet</em> is not specified.
     *
     * @param key selects message from resource
     */
    public void notice(String key) {
        if (quiet) {
            return;
        }
        messager.notice(key);
    }

    
Print a notice, iff quiet is not specified.
Params:
key – selects message from resource
a1 – first argument/**
     * Print a notice, iff <em>quiet</em> is not specified.
     *
     * @param key selects message from resource
     * @param a1 first argument
     */
    public void notice(String key, String a1) {
        if (quiet) {
            return;
        }
        messager.notice(key, a1);
    }

    TreePath getTreePath(JCCompilationUnit tree) {
        TreePath p = treePaths.get(tree);
        if (p == null)
            treePaths.put(tree, p = new TreePath(tree));
        return p;
    }

    TreePath getTreePath(JCCompilationUnit toplevel, JCPackageDecl tree) {
        TreePath p = treePaths.get(tree);
        if (p == null)
            treePaths.put(tree, p = new TreePath(getTreePath(toplevel), tree));
        return p;
    }

    TreePath getTreePath(JCCompilationUnit toplevel, JCClassDecl tree) {
        TreePath p = treePaths.get(tree);
        if (p == null)
            treePaths.put(tree, p = new TreePath(getTreePath(toplevel), tree));
        return p;
    }

    TreePath getTreePath(JCCompilationUnit toplevel, JCClassDecl cdecl, JCTree tree) {
        return new TreePath(getTreePath(toplevel, cdecl), tree);
    }

    public com.sun.tools.javac.code.Types getTypes() {
        return types;
    }

    public Env<AttrContext> getEnv(ClassSymbol tsym) {
        return enter.getEnv(tsym);
    }

    public boolean isQuiet() {
        return quiet;
    }
}