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Nuts'n'Bolts Utilities
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/*
 * Copyright (c) 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020 David Berkman
 *
 * This file is part of the SmallMind Code Project.
 *
 * The SmallMind Code Project is free software, you can redistribute
 * it and/or modify it under either, at your discretion...
 *
 * 1) The terms of GNU Affero General Public License as published by the
 * Free Software Foundation, either version 3 of the License, or (at
 * your option) any later version.
 *
 * ...or...
 *
 * 2) The terms of the Apache License, Version 2.0.
 *
 * The SmallMind Code Project 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 or Apache License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * and the Apache License along with the SmallMind Code Project. If not, see
 *  or .
 *
 * Additional permission under the GNU Affero GPL version 3 section 7
 * ------------------------------------------------------------------
 * If you modify this Program, or any covered work, by linking or
 * combining it with other code, such other code is not for that reason
 * alone subject to any of the requirements of the GNU Affero GPL
 * version 3.
 */
package org.smallmind.nutsnbolts.freemarker;

import java.io.IOException;
import java.io.InputStreamReader;
import java.io.Reader;
import freemarker.cache.TemplateLoader;

public class ClassPathTemplateLoader implements TemplateLoader {

  private Class anchorClass;
  ClassLoader classLoader;
  boolean relative;

  public ClassPathTemplateLoader () {

    this(Thread.currentThread().getContextClassLoader());
  }

  public ClassPathTemplateLoader (ClassLoader classLoader) {

    this.classLoader = classLoader;

    relative = false;
  }

  public ClassPathTemplateLoader (Class anchorClass) {

    this(anchorClass, false);
  }

  public ClassPathTemplateLoader (Class anchorClass, boolean relative) {

    this.anchorClass = anchorClass;
    this.relative = relative;

    classLoader = anchorClass.getClassLoader();
  }

  public Class getAnchorClass () {

    return anchorClass;
  }

  public ClassLoader getClassLoader () {

    return classLoader;
  }

  @Override
  public Object findTemplateSource (String name) {

    ClassPathTemplateSource source;

    if (relative && (anchorClass != null)) {

      StringBuilder pathBuilder = new StringBuilder(anchorClass.getPackage().getName().replace('.', '/'));

      pathBuilder.append('/').append(name);
      source = new ClassPathTemplateSource(classLoader, pathBuilder.toString());
    } else {
      source = new ClassPathTemplateSource(classLoader, name);
    }

    return (source.exists()) ? source : null;
  }

  @Override
  public long getLastModified (Object templateSource) {

    return -1;
  }

  @Override
  public Reader getReader (Object templateSource, String encoding)
    throws IOException {

    return new InputStreamReader(((ClassPathTemplateSource)templateSource).getInputStream(), encoding);
  }

  @Override
  public void closeTemplateSource (Object templateSource)
    throws IOException {

    ((ClassPathTemplateSource)templateSource).close();
  }
}