br.com.objectos.way.ui.Breadcrumb Maven / Gradle / Ivy

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/*
 * Copyright 2014 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.way.ui;

import static com.google.common.collect.Lists.newArrayList;

import java.util.List;

import org.codehaus.jackson.JsonGenerator;

import com.google.common.base.Function;
import com.google.common.base.Joiner;
import com.google.common.base.Predicates;
import com.google.common.collect.FluentIterable;
import com.google.common.collect.Lists;
import com.google.inject.Inject;

/**
 * @author [email protected] (Marcio Endo)
 */
class Breadcrumb {

  private final BaseUrl baseUrl;

  private final List items;

  @Inject
  public Breadcrumb(BaseUrl baseUrl) {
    this(baseUrl, Lists. newArrayList());
  }

  private Breadcrumb(BaseUrl baseUrl, List items) {
    this.baseUrl = baseUrl;
    this.items = items;
  }

  public void add(String text, String link) {
    items.add(new Item(text, link));
  }

  public void resume(Breadcrumb breadcrumb) {
    items.addAll(breadcrumb.items);
  }

  List get() {
    return FluentIterable.from(items)
        .transform(new ToCrumb())
        .toList();
  }

  private class ToCrumb implements Function {

    private final List links = newArrayList();

    @Override
    public Crumb apply(Item item) {
      int index = links.size();
      item.addTo(links);
      return new Crumb(index, item.text, links);
    }

  }

  private class Item {

    final String text;

    final String link;

    public Item(String text, String link) {
      this.text = text;
      this.link = link;
    }

    public void addTo(List links) {
      links.add(link);
    }

  }

  private class Crumb implements IsJsonSerializable {

    private final int index;

    private final String text;

    private final List links;

    public Crumb(int index, String text, List links) {
      this.index = index;
      this.text = text;
      this.links = FluentIterable.from(links)
          .filter(Predicates.notNull())
          .toList();
    }

    @Override
    public void toJson(JsonGenerator jgen) {
      WayUI.toJsonHelper(jgen)
          .add("first", index == 0)
          .add("text", text)
          .add("url", getUrl())
          .write();
    }

    private String getUrl() {
      String url = Joiner.on("/").skipNulls().join(links);
      return String.format("%s/%s", baseUrl, url);
    }

  }

}