/*

 * Copyright (c) 1997, 2012, 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 com.sun.tools.javadoc;

import java.io.File;

import java.io.IOException;

import java.lang.reflect.Modifier;

import java.net.URI;

import java.util.HashSet;

import java.util.Set;

import javax.tools.FileObject;

import javax.tools.JavaFileManager.Location;

import javax.tools.StandardJavaFileManager;

import javax.tools.StandardLocation;

import com.sun.javadoc.*;

import com.sun.tools.javac.code.Flags;

import com.sun.tools.javac.code.Kinds;

import com.sun.tools.javac.code.Scope;

import com.sun.tools.javac.code.Symbol;

import com.sun.tools.javac.code.Symbol.*;

import com.sun.tools.javac.code.Type;

import com.sun.tools.javac.code.Type.ClassType;

import com.sun.tools.javac.comp.AttrContext;

import com.sun.tools.javac.comp.Env;

import com.sun.tools.javac.tree.JCTree;

import com.sun.tools.javac.tree.JCTree.JCClassDecl;

import com.sun.tools.javac.tree.JCTree.JCFieldAccess;

import com.sun.tools.javac.tree.JCTree.JCImport;

import com.sun.tools.javac.tree.TreeInfo;

import com.sun.tools.javac.util.List;

import com.sun.tools.javac.util.ListBuffer;

import com.sun.tools.javac.util.Name;

import com.sun.tools.javac.util.Names;

import com.sun.tools.javac.util.Position;

import static com.sun.tools.javac.code.Kinds.*;

import static com.sun.tools.javac.tree.JCTree.Tag.*;

/**

 * Represents a java class and provides access to information

 * about the class, the class' comment and tags, and the

 * members of the class.  A ClassDocImpl only exists if it was

 * processed in this run of javadoc.  References to classes

 * which may or may not have been processed in this run are

 * referred to using Type (which can be converted to ClassDocImpl,

 * if possible).

 *

 *  <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>

 *

 * @see Type

 *

 * @since 1.2

 * @author Robert Field

 * @author Neal Gafter (rewrite)

 * @author Scott Seligman (generics, enums, annotations)

 */

public class ClassDocImpl extends ProgramElementDocImpl implements ClassDoc {

    public final ClassType type;        // protected->public for debugging

    protected final ClassSymbol tsym;

    boolean isIncluded = false;         // Set in RootDocImpl

    private SerializedForm serializedForm;

    /**

     * Constructor

     */

    public ClassDocImpl(DocEnv env, ClassSymbol sym) {

        this(env, sym, null, null, null);

    }

    /**

     * Constructor

     */

    public ClassDocImpl(DocEnv env, ClassSymbol sym, String documentation,

                        JCClassDecl tree, Position.LineMap lineMap) {

        super(env, sym, documentation, tree, lineMap);

        this.type = (ClassType)sym.type;

        this.tsym = sym;

    }

    /**

     * Returns the flags in terms of javac's flags

     */

    protected long getFlags() {

        return getFlags(tsym);

    }

    /**

     * Returns the flags of a ClassSymbol in terms of javac's flags

     */

    static long getFlags(ClassSymbol clazz) {

        while (true) {

            try {

                return clazz.flags();

            } catch (CompletionFailure ex) {

                // quietly ignore completion failures

            }

        }

    }

    /**

     * Is a ClassSymbol an annotation type?

     */

    static boolean isAnnotationType(ClassSymbol clazz) {

        return (getFlags(clazz) & Flags.ANNOTATION) != 0;

    }

    /**

     * Identify the containing class

     */

    protected ClassSymbol getContainingClass() {

        return tsym.owner.enclClass();

    }

    /**

     * Return true if this is a class, not an interface.

     */

    @Override

    public boolean isClass() {

        return !Modifier.isInterface(getModifiers());

    }

    /**

     * Return true if this is a ordinary class,

     * not an enumeration, exception, an error, or an interface.

     */

    @Override

    public boolean isOrdinaryClass() {

        if (isEnum() || isInterface() || isAnnotationType()) {

            return false;

        }

            if (t.tsym == env.syms.errorType.tsym ||

                t.tsym == env.syms.exceptionType.tsym) {

                return false;

            }

        }

        return true;

    }

    /**

     * Return true if this is an enumeration.

     * (For legacy doclets, return false.)

     */

    @Override

    public boolean isEnum() {

        return (getFlags() & Flags.ENUM) != 0

               &&

               !env.legacyDoclet;

    }

    /**

     * Return true if this is an interface, but not an annotation type.

     * Overridden by AnnotationTypeDocImpl.

     */

    @Override

    public boolean isInterface() {

        return Modifier.isInterface(getModifiers());

    }

    /**

     * Return true if this is an exception class

     */

    @Override

    public boolean isException() {

        if (isEnum() || isInterface() || isAnnotationType()) {

            return false;

        }

            if (t.tsym == env.syms.exceptionType.tsym) {

                return true;

            }

        }

        return false;

    }

    /**

     * Return true if this is an error class

     */

    @Override

    public boolean isError() {

        if (isEnum() || isInterface() || isAnnotationType()) {

            return false;

        }

            if (t.tsym == env.syms.errorType.tsym) {

                return true;

            }

        }

        return false;

    }

    /**

     * Return true if this is a throwable class

     */

    public boolean isThrowable() {

        if (isEnum() || isInterface() || isAnnotationType()) {

            return false;

        }

            if (t.tsym == env.syms.throwableType.tsym) {

                return true;

            }

        }

        return false;

    }

    /**

     * Return true if this class is abstract

     */

    public boolean isAbstract() {

        return Modifier.isAbstract(getModifiers());

    }

    /**

     * Returns true if this class was synthesized by the compiler.

     */

    public boolean isSynthetic() {

        return (getFlags() & Flags.SYNTHETIC) != 0;

    }

    /**

     * Return true if this class is included in the active set.

     * A ClassDoc is included iff either it is specified on the

     * commandline, or if it's containing package is specified

     * on the command line, or if it is a member class of an

     * included class.

     */

    public boolean isIncluded() {

        if (isIncluded) {

            return true;

        }

        if (env.shouldDocument(tsym)) {

            // Class is nameable from top-level and

            // the class and all enclosing classes

            // pass the modifier filter.

            if (containingPackage().isIncluded()) {

                return isIncluded=true;

            }

            ClassDoc outer = containingClass();

            if (outer != null && outer.isIncluded()) {

                return isIncluded=true;

            }

        }

        return false;

    }

    /**

     * Return the package that this class is contained in.

     */

    @Override

    public PackageDoc containingPackage() {

        PackageDocImpl p = env.getPackageDoc(tsym.packge());

        if (p.setDocPath == false) {

            FileObject docPath;

            try {

                Location location = env.fileManager.hasLocation(StandardLocation.SOURCE_PATH)

                    ? StandardLocation.SOURCE_PATH : StandardLocation.CLASS_PATH;

                docPath = env.fileManager.getFileForInput(

                        location, p.qualifiedName(), "package.html");

            } catch (IOException e) {

                docPath = null;

            }

            if (docPath == null) {

                // fall back on older semantics of looking in same directory as

                // source file for this class

                SourcePosition po = position();

                if (env.fileManager instanceof StandardJavaFileManager &&

                        po instanceof SourcePositionImpl) {

                    URI uri = ((SourcePositionImpl) po).filename.toUri();

                    if ("file".equals(uri.getScheme())) {

                        File f = new File(uri);

                        File dir = f.getParentFile();

                        if (dir != null) {

                            File pf = new File(dir, "package.html");

                            if (pf.exists()) {

                                StandardJavaFileManager sfm = (StandardJavaFileManager) env.fileManager;

                                docPath = sfm.getJavaFileObjects(pf).iterator().next();

                            }

                        }

                    }

                }

            }

            p.setDocPath(docPath);

        }

        return p;

    }

    /**

     * Return the class name without package qualifier - but with

     * enclosing class qualifier - as a String.

     * <pre>

     * Examples:

     *  for java.util.Hashtable

     *  return Hashtable

     *  for java.util.Map.Entry

     *  return Map.Entry

     * </pre>

     */

    public String name() {

        return getClassName(tsym, false);

    }

    /**

     * Return the qualified class name as a String.

     * <pre>

     * Example:

     *  for java.util.Hashtable

     *  return java.util.Hashtable

     *  if no qualifier, just return flat name

     * </pre>

     */

    public String qualifiedName() {

        return getClassName(tsym, true);

    }

    /**

     * Return unqualified name of type excluding any dimension information.

     * <p>

     * For example, a two dimensional array of String returns 'String'.

     */

    public String typeName() {

        return name();

    }

    /**

     * Return qualified name of type excluding any dimension information.

     *<p>

     * For example, a two dimensional array of String

     * returns 'java.lang.String'.

     */

    public String qualifiedTypeName() {

        return qualifiedName();

    }

    /**

     * Return the simple name of this type.

     */

    public String simpleTypeName() {

        return tsym.name.toString();

    }

    /**

     * Return the qualified name and any type parameters.

     * Each parameter is a type variable with optional bounds.

     */

    @Override

    public String toString() {

        return classToString(env, tsym, true);

    }

    /**

     * Return the class name as a string.  If "full" is true the name is

     * qualified, otherwise it is qualified by its enclosing class(es) only.

     */

    static String getClassName(ClassSymbol c, boolean full) {

        if (full) {

            return c.getQualifiedName().toString();

        } else {

            String n = "";

            for ( ; c != null; c = c.owner.enclClass()) {

                n = c.name + (n.equals("") ? "" : ".") + n;

            }

            return n;

        }

    }

    /**

     * Return the class name with any type parameters as a string.

     * Each parameter is a type variable with optional bounds.

     * If "full" is true all names are qualified, otherwise they are

     * qualified by their enclosing class(es) only.

     */

    static String classToString(DocEnv env, ClassSymbol c, boolean full) {

        StringBuilder s = new StringBuilder();

        if (!c.isInner()) {             // if c is not an inner class

            s.append(getClassName(c, full));

        } else {

            // c is an inner class, so include type params of outer.

            ClassSymbol encl = c.owner.enclClass();

            s.append(classToString(env, encl, full))

             .append('.')

             .append(c.name);

        }

        s.append(TypeMaker.typeParametersString(env, c, full));

        return s.toString();

    }

    /**

     * Is this class (or any enclosing class) generic?  That is, does

     * it have type parameters?

     */

    static boolean isGeneric(ClassSymbol c) {

        return c.type.allparams().nonEmpty();

    }

    /**

     * Return the formal type parameters of this class or interface.

     * Return an empty array if there are none.

     */

    public TypeVariable[] typeParameters() {

        if (env.legacyDoclet) {

            return new TypeVariable[0];

        }

        TypeVariable res[] = new TypeVariable[type.getTypeArguments().length()];

        TypeMaker.getTypes(env, type.getTypeArguments(), res);

        return res;

    }

    /**

     * Return the type parameter tags of this class or interface.

     */

    public ParamTag[] typeParamTags() {

        return (env.legacyDoclet)

            ? new ParamTag[0]

            : comment().typeParamTags();

    }

    /**

     * Return the modifier string for this class. If it's an interface

     * exclude 'abstract' keyword from the modifier string

     */

    @Override

    public String modifiers() {

        return Modifier.toString(modifierSpecifier());

    }

    @Override

    public int modifierSpecifier() {

        int modifiers = getModifiers();

        return (isInterface() || isAnnotationType())

                ? modifiers & ~Modifier.ABSTRACT

                : modifiers;

    }

    /**

     * Return the superclass of this class

     *

     * @return the ClassDocImpl for the superclass of this class, null

     * if there is no superclass.

     */

    public ClassDoc superclass() {

        if (isInterface() || isAnnotationType()) return null;

        if (tsym == env.syms.objectType.tsym) return null;

        ClassSymbol c = (ClassSymbol)env.types.supertype(type).tsym;

        if (c == null || c == tsym) c = (ClassSymbol)env.syms.objectType.tsym;

        return env.getClassDoc(c);

    }

    /**

     * Return the superclass of this class.  Return null if this is an

     * interface.  A superclass is represented by either a

     * <code>ClassDoc</code> or a <code>ParameterizedType</code>.

     */

    public com.sun.javadoc.Type superclassType() {

        if (isInterface() || isAnnotationType() ||

                (tsym == env.syms.objectType.tsym))

            return null;

        Type sup = env.types.supertype(type);

        return TypeMaker.getType(env,

                                 (sup != type) ? sup : env.syms.objectType);

    }

    /**

     * Test whether this class is a subclass of the specified class.

     *

     * @param cd the candidate superclass.

     * @return true if cd is a superclass of this class.

     */

    public boolean subclassOf(ClassDoc cd) {

        return tsym.isSubClass(((ClassDocImpl)cd).tsym, env.types);

    }

    /**

     * Return interfaces implemented by this class or interfaces

     * extended by this interface.

     *

     * @return An array of ClassDocImpl representing the interfaces.

     * Return an empty array if there are no interfaces.