/*

 * Copyright (c) 2003, 2013, 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.doclets.internal.toolkit.util.links;

import com.sun.javadoc.*;

import com.sun.tools.doclets.internal.toolkit.Content;

/**

 * A factory that constructs links from given link information.

 *

 *  <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>

 *

 * @author Jamie Ho

 * @since 1.5

 */

public abstract class LinkFactory {

    /**

     * Return an empty instance of a content object.

     *

     * @return an empty instance of a content object.

     */

    protected abstract Content newContent();

    /**

     * Constructs a link from the given link information.

     *

     * @param linkInfo the information about the link.

     * @return the output of the link.

     */

    public Content getLink(LinkInfo linkInfo) {

        if (linkInfo.type != null) {

            Type type = linkInfo.type;

            Content link = newContent();

            if (type.isPrimitive()) {

                //Just a primitive.

                link.addContent(type.typeName());

            } else if (type.asAnnotatedType() != null && type.dimension().length() == 0) {

                link.addContent(getTypeAnnotationLinks(linkInfo));

                linkInfo.type = type.asAnnotatedType().underlyingType();

                link.addContent(getLink(linkInfo));

                return link;

            } else if (type.asWildcardType() != null) {

                //Wildcard type.

                linkInfo.isTypeBound = true;

                link.addContent("?");

                WildcardType wildcardType = type.asWildcardType();

                Type[] extendsBounds = wildcardType.extendsBounds();

                for (int i = 0; i < extendsBounds.length; i++) {

                    link.addContent(i > 0 ? ", " : " extends ");

                    setBoundsLinkInfo(linkInfo, extendsBounds[i]);

                    link.addContent(getLink(linkInfo));

                }

                Type[] superBounds = wildcardType.superBounds();

                for (int i = 0; i < superBounds.length; i++) {

                    link.addContent(i > 0 ? ", " : " super ");

                    setBoundsLinkInfo(linkInfo, superBounds[i]);

                    link.addContent(getLink(linkInfo));

                }

            } else if (type.asTypeVariable()!= null) {

                link.addContent(getTypeAnnotationLinks(linkInfo));

                linkInfo.isTypeBound = true;

                //A type variable.

                Doc owner = type.asTypeVariable().owner();

                if ((! linkInfo.excludeTypeParameterLinks) &&

                        owner instanceof ClassDoc) {

                    linkInfo.classDoc = (ClassDoc) owner;

                    Content label = newContent();

                    label.addContent(type.typeName());

                    linkInfo.label = label;

                    link.addContent(getClassLink(linkInfo));

                } else {

                    //No need to link method type parameters.

                    link.addContent(type.typeName());

                }

                Type[] bounds = type.asTypeVariable().bounds();

                if (! linkInfo.excludeTypeBounds) {

                    linkInfo.excludeTypeBounds = true;

                    for (int i = 0; i < bounds.length; i++) {

                        link.addContent(i > 0 ? " & " : " extends ");

                        setBoundsLinkInfo(linkInfo, bounds[i]);

                        link.addContent(getLink(linkInfo));

                    }

                }

            } else if (type.asClassDoc() != null) {

                //A class type.

                if (linkInfo.isTypeBound &&

                        linkInfo.excludeTypeBoundsLinks) {

                    //Since we are excluding type parameter links, we should not

                    //be linking to the type bound.

                    link.addContent(type.typeName());

                    link.addContent(getTypeParameterLinks(linkInfo));

                    return link;

                } else {

                    linkInfo.classDoc = type.asClassDoc();

                    link = newContent();

                    link.addContent(getClassLink(linkInfo));

                    if (linkInfo.includeTypeAsSepLink) {

                        link.addContent(getTypeParameterLinks(linkInfo, false));

                    }

                }

            }

            if (linkInfo.isVarArg) {

                if (type.dimension().length() > 2) {

                    //Javadoc returns var args as array.

                    //Strip out the first [] from the var arg.

                    link.addContent(type.dimension().substring(2));

                }

                link.addContent("...");

            } else {

                while (type != null && type.dimension().length() > 0) {

                    if (type.asAnnotatedType() != null) {

                        linkInfo.type = type;

                        link.addContent(" ");

                        link.addContent(getTypeAnnotationLinks(linkInfo));

                        link.addContent("[]");

                        type = type.asAnnotatedType().underlyingType().getElementType();

                    } else {

                        link.addContent("[]");

                        type = type.getElementType();

                    }

                }

                linkInfo.type = type;

                Content newLink = newContent();

                newLink.addContent(getTypeAnnotationLinks(linkInfo));

                newLink.addContent(link);

                link = newLink;

            }

            return link;

        } else if (linkInfo.classDoc != null) {

            //Just a class link

            Content link = newContent();

            link.addContent(getClassLink(linkInfo));

            if (linkInfo.includeTypeAsSepLink) {

                link.addContent(getTypeParameterLinks(linkInfo, false));

            }

            return link;

        } else {

            return null;

        }

    }

    private void setBoundsLinkInfo(LinkInfo linkInfo, Type bound) {

        linkInfo.classDoc = null;

        linkInfo.label = null;

        linkInfo.type = bound;

    }

    /**

     * Return the link to the given class.

     *

     * @param linkInfo the information about the link to construct.

     *

     * @return the link for the given class.

     */

    protected abstract Content getClassLink(LinkInfo linkInfo);

    /**

     * Return the link to the given type parameter.

     *

     * @param linkInfo     the information about the link to construct.

     * @param typeParam the type parameter to link to.

     */

    protected abstract Content getTypeParameterLink(LinkInfo linkInfo,

        Type typeParam);

    protected abstract Content getTypeAnnotationLink(LinkInfo linkInfo,

            AnnotationDesc annotation);

    /**

     * Return the links to the type parameters.

     *

     * @param linkInfo     the information about the link to construct.

     * @return the links to the type parameters.

     */

    public Content getTypeParameterLinks(LinkInfo linkInfo) {

        return getTypeParameterLinks(linkInfo, true);

    }

    /**

     * Return the links to the type parameters.

     *

     * @param linkInfo     the information about the link to construct.

     * @param isClassLabel true if this is a class label.  False if it is

     *                     the type parameters portion of the link.

     * @return the links to the type parameters.

     */

    public Content getTypeParameterLinks(LinkInfo linkInfo, boolean isClassLabel) {

        Content links = newContent();

        Type[] vars;

        if (linkInfo.executableMemberDoc != null) {

            vars = linkInfo.executableMemberDoc.typeParameters();

        } else if (linkInfo.type != null &&

                linkInfo.type.asParameterizedType() != null){

            vars =  linkInfo.type.asParameterizedType().typeArguments();

        } else if (linkInfo.classDoc != null){

            vars = linkInfo.classDoc.typeParameters();

        } else {

            //Nothing to document.

            return links;

        }

        if (((linkInfo.includeTypeInClassLinkLabel && isClassLabel) ||

             (linkInfo.includeTypeAsSepLink && ! isClassLabel)

              )

            && vars.length > 0) {

            links.addContent("<");

            for (int i = 0; i < vars.length; i++) {

                if (i > 0) {

                    links.addContent(",");

                }

                links.addContent(getTypeParameterLink(linkInfo, vars[i]));

            }

            links.addContent(">");

        }

        return links;

    }

    public Content getTypeAnnotationLinks(LinkInfo linkInfo) {

        Content links = newContent();

        if (linkInfo.type.asAnnotatedType() == null)

            return links;

        AnnotationDesc[] annotations = linkInfo.type.asAnnotatedType().annotations();

        for (int i = 0; i < annotations.length; i++) {

            if (i > 0) {

                links.addContent(" ");

            }

            links.addContent(getTypeAnnotationLink(linkInfo, annotations[i]));

        }

        links.addContent(" ");

        return links;

    }

}