/*

 * Copyright (c) 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.

 *

 * 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 crules;

import java.text.MessageFormat;

import java.util.Locale;

import java.util.ResourceBundle;

import javax.lang.model.element.TypeElement;

import javax.tools.JavaFileObject;

import com.sun.source.tree.Tree;

import com.sun.source.util.JavacTask;

import com.sun.source.util.Plugin;

import com.sun.source.util.TaskEvent;

import com.sun.source.util.TaskListener;

import com.sun.source.util.Trees;

import com.sun.tools.javac.api.BasicJavacTask;

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

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

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

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

import static com.sun.source.util.TaskEvent.Kind;

public abstract class AbstractCodingRulesAnalyzer implements Plugin {

    protected Log log;

    protected Trees trees;

    protected TreeScanner treeVisitor;

    protected Kind eventKind;

    protected Messages messages;

    public void init(JavacTask task, String... args) {

        BasicJavacTask impl = (BasicJavacTask)task;

        Context context = impl.getContext();

        log = Log.instance(context);

        trees = Trees.instance(task);

        messages = new Messages();

        task.addTaskListener(new PostAnalyzeTaskListener());

    }

    public class PostAnalyzeTaskListener implements TaskListener {

        @Override

        public void started(TaskEvent taskEvent) {}

        @Override

        public void finished(TaskEvent taskEvent) {

            if (taskEvent.getKind().equals(eventKind)) {

                TypeElement typeElem = taskEvent.getTypeElement();

                Tree tree = trees.getTree(typeElem);

                if (tree != null) {

                    JavaFileObject prevSource = log.currentSourceFile();

                    try {

                        log.useSource(taskEvent.getCompilationUnit().getSourceFile());

                        treeVisitor.scan((JCTree)tree);

                    } finally {

                        log.useSource(prevSource);

                    }

                }

            }

        }

    }

    class Messages {

        ResourceBundle bundle;

        Messages() {

            String name = getClass().getPackage().getName() + ".resources.crules";

            bundle = ResourceBundle.getBundle(name, Locale.ENGLISH);

        }

        public void error(JCTree tree, String code, Object... args) {

            String msg = (code == null) ? (String) args[0] : localize(code, args);

            log.error(tree, "proc.messager", msg.toString());

        }

        private String localize(String code, Object... args) {

            String msg = bundle.getString(code);

            if (msg == null) {

                StringBuilder sb = new StringBuilder();

                sb.append("message file broken: code=").append(code);

                if (args.length > 0) {

                    sb.append(" arguments={0}");

                    for (int i = 1; i < args.length; i++) {

                        sb.append(", {").append(i).append("}");

                    }

                }

                msg = sb.toString();

            }

            return MessageFormat.format(msg, args);

        }

    }

}