br.com.objectos.html.io.HtmlFinder Maven / Gradle / Ivy

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/*
 * Copyright 2016 Objectos, Fábrica de Software LTDA.
 *
 * 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 br.com.objectos.html.io;

import java.io.IOException;
import java.io.InputStream;
import java.io.UncheckedIOException;
import java.net.MalformedURLException;
import java.net.URL;

/**
 * @author [email protected] (Marcio Endo)
 */
public class HtmlFinder implements AutoCloseable {

  private final HtmlReader reader;
  private ValueList valueList = ValueList.empty();

  private HtmlFinder(HtmlReader reader) {
    this.reader = reader;
  }

  public static HtmlFinder connect(String url) {
    try {
      URL theUrl = new URL(url);
      return open(theUrl.openStream());
    } catch (MalformedURLException e) {
      throw new IllegalArgumentException("Not a valid url: " + url);
    } catch (IOException e) {
      throw new UncheckedIOException(e);
    }
  }

  public static HtmlFinder open(InputStream in) {
    HtmlReader reader = HtmlReader.open(in);
    return new HtmlFinder(reader);
  }

  @Override
  public void close() throws IOException {
    reader.close();
  }

  public SingleValue findFirst(String css) {
    SingleValue value = FindFirst.of(css);
    valueList = valueList.add(value);
    return value;
  }

  public void find() {
    valueList.consume(reader);
  }

}