/**
    * Copyright (C) 2014-2017 Philip Helger (www.helger.com)
    * philip[at]helger[dot]com
    *
    * Licensed under the Apache License, Version 2.0 (the "License");
    * you may not use this file except in compliance with the License.
    * You may obtain a copy of the License at
    *
    *         http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package com.helger.schematron.resolve;
  
  import java.io.IOException;
  import java.net.URL;
  
  import javax.annotation.Nonnull;
  import javax.annotation.Nullable;
  
  import com.helger.commons.annotation.Nonempty;
  import com.helger.commons.io.resource.IReadableResource;
  import com.helger.commons.io.resourceresolver.DefaultResourceResolver;
  import com.helger.commons.string.ToStringGenerator;
  
  /**
   * The default implementation of {@link ISchematronIncludeResolver} using the
   * {@link DefaultResourceResolver#getResolvedResource(String, String)} method
   * internally.
   *
   * @author Philip Helger
   */
  public class DefaultSchematronIncludeResolver implements ISchematronIncludeResolver
  {
    private final String m_sBaseHref;
  
    @Nullable
    private static String _getBaseHref (@Nonnull final IReadableResource aResource)
    {
      final URL aURL = aResource.getAsURL ();
      return aURL == null ? null : aURL.toExternalForm ();
    }
  
    public DefaultSchematronIncludeResolver (@Nonnull final IReadableResource aResource)
    {
      this (_getBaseHref (aResource));
    }
  
    public DefaultSchematronIncludeResolver (@Nullable final String sBaseHref)
    {
      m_sBaseHref = sBaseHref;
    }
  
    @Nullable
    public String getBaseHref ()
    {
      return m_sBaseHref;
    }
  
    @Nonnull
    public IReadableResource getResolvedSchematronResource (@Nonnull @Nonempty final String sHref) throws IOException
    {
      return DefaultResourceResolver.getResolvedResource (sHref, getBaseHref ());
    }
  
    @Override
    public String toString ()
    {
      return new ToStringGenerator (this).append ("baseHref", m_sBaseHref).getToString ();
    }
  }