/*
    * Copyright 2020-2022  the original author or authors.
    *
    * 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 org.bremersee.xml;
  
  import jakarta.xml.bind.SchemaOutputResolver;
  import java.io.StringReader;
  import java.io.StringWriter;
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.HashSet;
  import java.util.LinkedHashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.Optional;
  import java.util.Set;
  import javax.xml.transform.Result;
  import javax.xml.transform.Source;
  import javax.xml.transform.stream.StreamResult;
  import javax.xml.transform.stream.StreamSource;
  import lombok.AccessLevel;
  import lombok.NoArgsConstructor;
  
  /**
   * The schema sources resolver.
   *
   * @author Christian Bremer
   */
  @NoArgsConstructor(access = AccessLevel.PACKAGE)
  class SchemaSourcesResolver extends SchemaOutputResolver {
  
    private final Map<String, StreamResult> buffers = new LinkedHashMap<>();
  
    @Override
    public Result createOutput(String namespaceUri, String suggestedFileName) {
      StringWriter out = new StringWriter();
      StreamResult res = new StreamResult(out);
      res.setSystemId(suggestedFileName);
      buffers.put(namespaceUri, res);
      return res;
    }
  
    /**
     * To sources.
     *
     * @param excludedNameSpaces the excluded name spaces
     * @return the list with the schema sources
     */
    List<Source> toSources(Collection<String> excludedNameSpaces) {
      Set<String> excluded = Optional.ofNullable(excludedNameSpaces)
          .map(HashSet::new)
          .orElseGet(HashSet::new);
      List<Source> sources = new ArrayList<>(buffers.size());
      for (Map.Entry<String, StreamResult> result : buffers.entrySet()) {
        if (!excluded.contains(result.getKey())) {
          String systemId = result.getValue().getSystemId();
          String schema = result.getValue().getWriter().toString();
          StreamSource source = new StreamSource(new StringReader(schema), systemId);
          sources.add(source);
        }
      }
      return sources;
    }
  
  }