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 * Copyright (c) 2011, 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.
 *
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package com.sun.tools.internal.ws.wscompile.plugin.at_generated;

import com.sun.codemodel.internal.*;
import com.sun.tools.internal.ws.ToolVersion;
import com.sun.tools.internal.ws.processor.model.Model;
import com.sun.tools.internal.ws.wscompile.ErrorReceiver;
import com.sun.tools.internal.ws.wscompile.Plugin;
import com.sun.tools.internal.ws.wscompile.WsimportOptions;
import com.sun.tools.internal.ws.wscompile.WsimportTool;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Iterator;
import org.xml.sax.SAXException;

/**
 * {@link Plugin} that marks the generated code by using JSR-250's '@Generated'.
 * It is based on a similar plugin in JAXB RI.
 *
 * @author Lukas Jungmann
 * @since 2.2.6
 */
public final class PluginImpl extends Plugin {

    private JClass annotation;

    // cache the timestamp so that all the @Generated annotations match
    private String date = null;

    @Override
    public String getOptionName() {
        return "mark-generated";
    }

    @Override
    public String getUsage() {
        return "  -mark-generated    :  mark the generated code as @javax.annotation.Generated";
    }

    @Override
    public boolean run(Model model, WsimportOptions wo, ErrorReceiver er) throws SAXException {
        JCodeModel cm = wo.getCodeModel();
        // we want this to work without requiring JSR-250 jar.
        annotation = cm.ref("javax.annotation.Generated");

        for (Iterator<JPackage> i = cm.packages(); i.hasNext();) {
            for (Iterator<JDefinedClass> j = i.next().classes(); j.hasNext();) {
                annotate(j.next());
            }
        }

        return true;
    }

    private void annotate(JAnnotatable m) {
        m.annotate(annotation)
                .param("value", WsimportTool.class.getName())
                .param("date", getISO8601Date())
                .param("comments", ToolVersion.VERSION.BUILD_VERSION);
    }

    /**
     * calculate the date value in ISO8601 format for the @Generated annotation
     * @return the date value
     */
    private String getISO8601Date() {
        if(date==null) {
            StringBuilder tstamp = new StringBuilder();
            tstamp.append((new SimpleDateFormat("yyyy-MM-dd'T'hh:mm:ssZ")).format(new Date()));
            // hack to get ISO 8601 style timezone - is there a better way that doesn't require
            // a bunch of timezone offset calculations?
            tstamp.insert(tstamp.length()-2, ':');
            date = tstamp.toString();
        }
        return date;
    }
}