content: package act.cli.util;
  
  /*-
   * #%L
   * ACT Framework
   * %%
   * Copyright (C) 2014 - 2017 ActFramework
   * %%
   * 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.
   * #L%
   */
  
  import act.cli.CliContext;
  import act.cli.view.CliView;
  import act.util.PropertySpec;
  import org.osgl.util.C;
  
  import java.util.List;
  
  /**
   * Used to paginate table layout
   */
  public class TableCursor implements CliCursor {
  
      private List data;
      private int pageSize;
      private int pageNo;
      private PropertySpec.MetaInfo propertySpec;
  
      public TableCursor(List data, int pageSize, PropertySpec.MetaInfo propertySpec) {
          this.data = data;
          this.pageSize = pageSize;
          this.propertySpec = propertySpec;
      }
  
      private List get() {
          int history = pageSize * pageNo++;
          if (history >= data.size()) {
              return C.list();
          }
          return C.list(data).drop(history).take(pageSize);
      }
  
      @Override
      public boolean hasNext() {
          return pageSize * pageNo < data.size();
      }
  
      @Override
      public void output(CliContext context) {
          List list = get();
          if (list.isEmpty()) {
              context.session().removeCursor();
              context.println("no cursor");
              return;
          } else {
              CliView.TABLE.print(list, propertySpec, context);
          }
      }
  
      @Override
      public int records() {
          return data.size();
      }
  }
  