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.view.border;
  
  import android.graphics.Color;
  import android.graphics.LinearGradient;
  import android.graphics.PathEffect;
  import android.graphics.Shader;
  import android.support.annotation.Nullable;
  import org.apache.weex.dom.CSSShorthand;
  
  enum BorderStyle {
    SOLID,
    DASHED,
    DOTTED;
  
    /**
     * Use {@link LinearGradient} to replace {@link PathEffect}
     * for implementing {@link #DASHED} or {@link #DASHED}
     * @param borderWidth width of the edge
     * @param borderColor color of the edge
     * @param edge the index of the ede. See {@link CSSShorthand}
     * @return An object of {@link LinearGradient} without color transitions for {@link #DOTTED}
     * or {@link #DASHED}, null otherwise
     */
    @Nullable
    Shader getLineShader(float borderWidth, int borderColor, CSSShorthand.EDGE edge) {
      switch (this) {
        case DOTTED:
          if (edge == CSSShorthand.EDGE.LEFT || edge == CSSShorthand.EDGE.RIGHT) {
            return new LinearGradient(0, 0, 0, borderWidth * 2, new int[]{borderColor, Color
                    .TRANSPARENT}, new float[]{0.5f, 0.5f}, Shader.TileMode.REPEAT);
          } else if (edge == CSSShorthand.EDGE.TOP || edge == CSSShorthand.EDGE.BOTTOM) {
            return new LinearGradient(0, 0, borderWidth * 2, 0, new int[]{borderColor, Color
                    .TRANSPARENT}, new float[]{0.5f, 0.5f}, Shader.TileMode.REPEAT);
          }
        case DASHED:
          if (edge == CSSShorthand.EDGE.LEFT || edge == CSSShorthand.EDGE.RIGHT) {
            return new LinearGradient(0, 0, 0, borderWidth * 6, new int[]{borderColor, Color
                    .TRANSPARENT}, new float[]{0.5f, 0.5f}, Shader.TileMode.REPEAT);
          } else if (edge == CSSShorthand.EDGE.TOP || edge == CSSShorthand.EDGE.BOTTOM) {
            return new LinearGradient(0, 0, borderWidth * 6, 0, new int[]{borderColor, Color
                    .TRANSPARENT}, new float[]{0.5f, 0.5f}, Shader.TileMode.REPEAT);
          }
        default:
          return null;
      }
    }
  }
  