/*
    * SPDX-FileCopyrightText: Copyright (c) 2012-2025 Yegor Bugayenko
    * SPDX-License-Identifier: MIT
    */
   package com.jcabi.xml;
   
   import java.io.InputStream;
   import javax.xml.transform.Source;
   import javax.xml.transform.TransformerException;
  import javax.xml.transform.stream.StreamSource;
  import lombok.EqualsAndHashCode;
  
  /**
   * Sources in classpath.
   * @since 0.9
   */
  @EqualsAndHashCode(of = "prefix")
  public final class ClasspathSources implements Sources {
  
      /**
       * Pattern to compose resource.
       */
      private static final String PATTERN = "%s%s";
  
      /**
       * Prefix.
       */
      private final transient String prefix;
  
      /**
       * Public ctor.
       */
      public ClasspathSources() {
          this("");
      }
  
      /**
       * Public ctor.
       * @param type Start with this type
       */
      public ClasspathSources(final Class<?> type) {
          this(
              String.format(
                  "/%s/",
                  type.getPackage().getName().replace(".", "/")
              )
          );
      }
  
      /**
       * Public ctor.
       * @param pfx Classpath prefix
       */
      public ClasspathSources(final String pfx) {
          this.prefix = pfx;
      }
  
      @Override
      @SuppressWarnings("PMD.CloseResource")
      public Source resolve(final String href, final String base)
          throws TransformerException {
          InputStream stream = this.getClass().getResourceAsStream(
              String.format(ClasspathSources.PATTERN, this.prefix, href)
          );
          if (stream == null) {
              final InputStream fallback = this.getClass().getResourceAsStream(
                  String.format(ClasspathSources.PATTERN, base, href)
              );
              if (fallback == null) {
                  throw new TransformerException(
                      String.format(
                          "Resource \"%s\" not found in classpath with prefix \"%s\" and base \"%s\"",
                          href, this.prefix, base
                      )
                  );
              }
              stream = fallback;
          }
          return new StreamSource(stream);
      }
  }