content: /**
   * Copyright 2018 Alibaba Group
   *
   * 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 com.alibaba.android.bindingx.core.internal;
  
  import android.support.annotation.Nullable;
  import android.text.TextUtils;
  
  /**
   * Description:
   *
   * This class holds an expression which include origin expression and
   * the transformed expression.
   *
   * Created by rowandjj(chuyi)<br/>
   */
  
  public class ExpressionPair {
  
      // the original expression
      public final String origin;
  
      // the expression that has been transformed to abstract syntax tree
      public final String transformed;
  
      public ExpressionPair(String origin,String transformed) {
          this.origin = origin;
          this.transformed = transformed;
      }
  
      public static ExpressionPair create(@Nullable String origin, @Nullable String transformed) {
          return new ExpressionPair(origin,transformed);
      }
  
      public static boolean isValid(@Nullable ExpressionPair pair) {
          return pair != null && !TextUtils.isEmpty(pair.transformed) && !"{}".equals(pair.transformed);
      }
  
      @Override
      public boolean equals(Object o) {
          if (this == o) return true;
          if (o == null || getClass() != o.getClass()) return false;
  
          ExpressionPair that = (ExpressionPair) o;
  
          if (origin != null ? !origin.equals(that.origin) : that.origin != null) return false;
          return transformed != null ? transformed.equals(that.transformed) : that.transformed == null;
  
      }
  
      @Override
      public int hashCode() {
          int result = origin != null ? origin.hashCode() : 0;
          result = 31 * result + (transformed != null ? transformed.hashCode() : 0);
          return result;
      }
  }
  