content: /**
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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.apache.weex.ui.component.list;
  
  import android.support.v7.widget.RecyclerView;
  
  import org.apache.weex.common.Constants;
  import org.apache.weex.ui.view.listview.adapter.TransformItemDecoration;
  import org.apache.weex.utils.WXLogUtils;
  
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  /**
   * recycler item decoration transform
   * Created by jianbai.gbj on 2017/9/14.
   */
  public class RecyclerTransform {
  
      public static final String TRANSFORM = Constants.Name.TRANSFORM;
      private static final Pattern transformPattern = Pattern.compile("([a-z]+)\\(([0-9\\.]+),?([0-9\\.]+)?\\)");
      private static final String TAG = "RecyclerTransform";
  
      /**
       * These transform functions are supported:
       * - `scale(x,y)`: scale item, x and y should be a positive float number.
       * - `translate(x,y)`: translate item, `x` and `y` shoule be integer numbers.
       * - `opacity(n)`: change the transparency of item, `n` must in `[0,1.0]`.
       * - `rotate(n)`: rotate item, n is integer number.
       *
       * @param raw
       * @return
       */
      public static RecyclerView.ItemDecoration parseTransforms(int orientation, String raw) {
          if (raw == null) {
              return null;
          }
          float scaleX = 0f, scaleY = 0f;
          int translateX = 0, translateY = 0;
          float opacity = 0f;
          int rotate = 0;
          //public TransformItemDecoration(boolean isVertical,float alpha,int translateX,int translateY,int rotation,float scale)
          Matcher matcher = transformPattern.matcher(raw);
          while (matcher.find()) {
              String match = matcher.group();
              String name = matcher.group(1);
              try {
                  switch (name) {
                      case "scale":
                          scaleX = Float.parseFloat(matcher.group(2));
                          scaleY = Float.parseFloat(matcher.group(3));
                          break;
                      case "translate":
                          translateX = Integer.parseInt(matcher.group(2));
                          translateY = Integer.parseInt(matcher.group(3));
                          break;
                      case "opacity":
                          opacity = Float.parseFloat(matcher.group(2));
                          break;
                      case "rotate":
                          rotate = Integer.parseInt(matcher.group(2));
                          break;
                      default:
                          WXLogUtils.e(TAG, "Invaild transform expression:" + match);
                          break;
                  }
              } catch (NumberFormatException e) {
                  WXLogUtils.e("", e);
                  WXLogUtils.e(TAG, "Invaild transform expression:" + match);
              }
          }
          return new TransformItemDecoration(orientation == Constants.Orientation.VERTICAL, opacity, translateX, translateY, rotate, scaleX, scaleY);
      }
  }
  