/*
 * 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 org.openjdk.btrace.instr.templates;

import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.StringTokenizer;

/**
 * A central place for bytecode templates
 *
 * @author Jaroslav Bachorik
 * @since 1.3
 */
public final class BTraceTemplates {
  private static final Map<String, Template> TEMPLATE_MAP = new HashMap<>();

  public static void registerTemplates(Template... templates) {
    for (Template t : templates) {
      TEMPLATE_MAP.put(t.getId(), t);
    }
  }

  public static Template getTemplate(String owner, String name, String sig) {
    Template t;

    if (!owner.equals(Template.OWNER)) {
      return null;
    }

    int idx = name.indexOf(':');
    if (idx > -1) {
      String tName = name.substring(0, idx);
      String tagList = name.substring(idx + 1);

      t = getTemplate(Template.getId(owner, tName, sig));
      if (t != null) {
        StringTokenizer st = new StringTokenizer(tagList, ",");

        Set<String> tags = new HashSet<>();
        while (st.hasMoreTokens()) {
          String param = st.nextToken();
          tags.add(param);
        }

        t.setTags(tags);
      }
    } else {
      t = getTemplate(Template.getId(owner, name, sig));
    }

    return t;
  }

  private static Template getTemplate(String id) {
    Template t = TEMPLATE_MAP.get(id);
    return t != null ? t.duplicate() : null;
  }
}
