br.com.objectos.way.ui.PageRequestPojo 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.Sets.newHashSet;

import java.util.List;
import java.util.Set;

import javax.servlet.http.HttpServletRequest;

import com.google.common.base.Function;
import com.google.common.base.Optional;
import com.google.common.base.Predicate;
import com.google.common.base.Predicates;
import com.google.common.collect.FluentIterable;
import com.google.common.collect.ImmutableList;
import com.google.inject.Inject;
import com.google.inject.Provider;
import com.google.sitebricks.headless.Reply;
import com.google.sitebricks.headless.Request;

/**
 * @author [email protected] (Marcio Endo)
 */
class PageRequestPojo implements PageRequest {

  private final Method method;

  private final Provider servletRequests;
  private final Set methods;
  private final Set conditions;

  @Inject
  public PageRequestPojo(Request request,
                         Provider servletRequests) {
    this.method = Method.parse(request);
    this.servletRequests = servletRequests;
    this.methods = newHashSet();
    this.conditions = newHashSet();
  }

  public PageRequestPojo(PageRequestBuilderPojo builder) {
    method = builder.getMethod();
    servletRequests = builder.getServletRequests();
    methods = builder.getMethods();
    conditions = builder.getConditions();
  }

  @SuppressWarnings("unchecked")
  @Override
  public  T get(Class key) {
    HttpServletRequest request = servletRequests.get();
    return (T) request.getAttribute(key.getName());
  }

  @Override
  public PageRequestPojo toPojo() {
    return this;
  }

  PageRequest addAll(List requests) {
    for (PageRequest request : requests) {
      request.toPojo()
          .addAllTo(this.conditions);
    }
    return this;
  }

  void addAllTo(Set thatConditions) {
    thatConditions.addAll(this.conditions);
  }

  Optional> shouldUI() {
    Optional condition = FluentIterable.from(conditions)
        .filter(new PageConditionIsSatisfied())
        .first();

    List> optionals;
    optionals = ImmutableList.of(condition);

    Iterable conditions;
    conditions = Optional.presentInstances(optionals);

    return FluentIterable.from(conditions)
        .filter(shouldCall())
        .transform(ToReply.INSTANCE)
        .filter(Predicates.notNull())
        .first();
  }

  Predicate shouldCall() {
    boolean result = methods.contains(method);
    return result ?
        Predicates. alwaysTrue() :
        Predicates. alwaysFalse();
  }

  private class PageConditionIsSatisfied implements Predicate {
    @Override
    public boolean apply(PageCondition input) {
      return input.isSatisfied(PageRequestPojo.this);
    }
  }

  private enum ToReply implements Function> {
    INSTANCE;
    @Override
    public Reply apply(PageCondition input) {
      return input.preReply();
    }
  }

}