/*

 * 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.javadoc;

import com.sun.javadoc.*;

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

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

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

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

/**

 * Represents an annotation.

 * An annotation associates a value with each element of an annotation type.

 * Sure it ought to be called "Annotation", but that clashes with

 * java.lang.annotation.Annotation.

 *

 *  <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 Scott Seligman

 * @since 1.5

 */

public class AnnotationDescImpl implements AnnotationDesc {

    private final DocEnv env;

    private final Attribute.Compound annotation;

    AnnotationDescImpl(DocEnv env, Attribute.Compound annotation) {

        this.env = env;

        this.annotation = annotation;

    }

    /**

     * Returns the annotation type of this annotation.

     */

    public AnnotationTypeDoc annotationType() {

        ClassSymbol atsym = (ClassSymbol)annotation.type.tsym;

        if (annotation.type.isErroneous()) {

            env.warning(null, "javadoc.class_not_found", annotation.type.toString());

            return new AnnotationTypeDocImpl(env, atsym);

        } else {

            return (AnnotationTypeDoc)env.getClassDoc(atsym);

        }

    }

    /**

     * Returns this annotation's elements and their values.

     * Only those explicitly present in the annotation are

     * included, not those assuming their default values.

     * Returns an empty array if there are none.

     */

    public ElementValuePair[] elementValues() {

        List<Pair<MethodSymbol,Attribute>> vals = annotation.values;

        ElementValuePair res[] = new ElementValuePair[vals.length()];

        int i = 0;

        for (Pair<MethodSymbol,Attribute> val : vals) {

            res[i++] = new ElementValuePairImpl(env, val.fst, val.snd);

        }

        return res;

    }

    /**

     * Check for the synthesized bit on the annotation.

     *

     * @return true if the annotation is synthesized.

     */

    public boolean isSynthesized() {

        return annotation.isSynthesized();

    }

    /**

     * Returns a string representation of this annotation.

     * String is of one of the forms:

     *     @com.example.foo(name1=val1, name2=val2)

     *     @com.example.foo(val)

     *     @com.example.foo

     * Omit parens for marker annotations, and omit "value=" when allowed.

     */

    @Override

    public String toString() {

        StringBuilder sb = new StringBuilder("@");

        sb.append(annotation.type.tsym);

        ElementValuePair vals[] = elementValues();

        if (vals.length > 0) {          // omit parens for marker annotation

            sb.append('(');

            boolean first = true;

            for (ElementValuePair val : vals) {

                if (!first) {

                    sb.append(", ");

                }

                first = false;

                String name = val.element().name();

                if (vals.length == 1 && name.equals("value")) {

                    sb.append(val.value());

                } else {

                    sb.append(val);

                }

            }

            sb.append(')');

        }

        return sb.toString();

    }

    /**

     * Represents an association between an annotation type element

     * and one of its values.

     */

    public static class ElementValuePairImpl implements ElementValuePair {

        private final DocEnv env;

        private final MethodSymbol meth;

        private final Attribute value;

        ElementValuePairImpl(DocEnv env, MethodSymbol meth, Attribute value) {

            this.env = env;

            this.meth = meth;

            this.value = value;

        }

        /**

         * Returns the annotation type element.

         */

        public AnnotationTypeElementDoc element() {

            return env.getAnnotationTypeElementDoc(meth);

        }

        /**

         * Returns the value associated with the annotation type element.

         */

        public AnnotationValue value() {

            return new AnnotationValueImpl(env, value);

        }

        /**

         * Returns a string representation of this pair

         * of the form "name=value".

         */

        @Override

        public String toString() {

            return meth.name + "=" + value();

        }

    }

}