/**
 * Copyright (c) 2008, SnakeYAML
 *
 * 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.pyyaml;

import java.io.IOException;
import java.io.Reader;
import java.util.Iterator;
import org.yaml.snakeyaml.LoaderOptions;
import org.yaml.snakeyaml.Yaml;
import org.yaml.snakeyaml.composer.Composer;
import org.yaml.snakeyaml.error.YAMLException;

public class CanonicalLoader extends Yaml {

  @Override
  public Object load(Reader yaml) {
    try {
      int ch = yaml.read();
      StringBuilder buffer = new StringBuilder();
      while (ch != -1) {
        buffer.append((char) ch);
        ch = yaml.read();
      }
      Composer composer =
          new Composer(new CanonicalParser(buffer.toString().replace(System.lineSeparator(), "\n")),
              resolver, new LoaderOptions());
      constructor.setComposer(composer);
      return constructor.getSingleData(Object.class);
    } catch (IOException e) {
      throw new YAMLException(e);
    }
  }

  public Iterable<Object> loadAll(Reader yaml) {
    try {
      int ch = yaml.read();
      StringBuilder buffer = new StringBuilder();
      while (ch != -1) {
        buffer.append((char) ch);
        ch = yaml.read();
      }
      Composer composer =
          new Composer(new CanonicalParser(buffer.toString()), resolver, new LoaderOptions());
      this.constructor.setComposer(composer);
      Iterator<Object> result = new Iterator<Object>() {
        public boolean hasNext() {
          return constructor.checkData();
        }

        public Object next() {
          return constructor.getData();
        }

        public void remove() {
          throw new UnsupportedOperationException();
        }
      };
      return new YamlIterable(result);
    } catch (IOException e) {
      throw new YAMLException(e);
    }
  }

  private class YamlIterable implements Iterable<Object> {

    private final Iterator<Object> iterator;

    public YamlIterable(Iterator<Object> iterator) {
      this.iterator = iterator;
    }

    public Iterator<Object> iterator() {
      return iterator;
    }

  }
}
