/*
 * Copyright (c) 2014, 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
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 */

package com.sun.btrace.util.templates;

import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;

/**
 * A generic base class for {@linkplain TemplateExpander} implementations
 * @author Jaroslav Bachorik
 */
abstract public class BaseTemplateExpander implements TemplateExpander {
    private final Set<Template> supportedTemplates = new HashSet<Template>();

    private Template lastTemplate = null;

    public BaseTemplateExpander(Template ... templates) {
        this.supportedTemplates.addAll(Arrays.asList(templates));
        BTraceTemplates.registerTemplates(templates);
    }


    @Override
    final public Result expand(TemplateExpanderVisitor v, Template t) {
        if (lastTemplate == null) {
            if (t == null || !supportedTemplates.contains(t)) {
                return Result.IGNORED;
            }

            recordTemplate(t);
            lastTemplate = t;
            return Result.CLAIMED;
        } else {
            if (lastTemplate.equals(t)) {
                recordTemplate(t);
                return Result.CLAIMED;
            } else {
                Result r = expandTemplate(v, lastTemplate);
                lastTemplate = t;
                return t != null ? r : Result.IGNORED;
            }
        }
    }

    abstract protected void recordTemplate(Template t);
    abstract protected Result expandTemplate(TemplateExpanderVisitor v, Template t);
}