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.carbondata.core.scan.expression;
  
  import java.io.Serializable;
  import java.util.ArrayList;
  import java.util.List;
  
  import org.apache.carbondata.core.constants.CarbonCommonConstants;
  import org.apache.carbondata.core.scan.expression.exception.FilterIllegalMemberException;
  import org.apache.carbondata.core.scan.expression.exception.FilterUnsupportedException;
  import org.apache.carbondata.core.scan.filter.intf.ExpressionType;
  import org.apache.carbondata.core.scan.filter.intf.RowIntf;
  
  public abstract class Expression implements Serializable {
  
    private static final long serialVersionUID = -7568676723039530713L;
    protected List<Expression> children =
        new ArrayList<Expression>(CarbonCommonConstants.DEFAULT_COLLECTION_SIZE);
  
    // When a filter expression already has the dictionary surrogate values in
    // it then we set isAlreadyResolved as true so that we do not resolve the
    // filter expression in further steps.
    protected boolean isAlreadyResolved;
  
    public abstract ExpressionResult evaluate(RowIntf value)
        throws FilterUnsupportedException, FilterIllegalMemberException;
  
    public abstract ExpressionType getFilterExpressionType();
  
    public List<Expression> getChildren() {
      return children;
    }
  
    /**
     * This method finds the Expression pointed by oldExpr and replace it with newExpr.
     * @param oldExpr
     * @param newExpr
     */
    public abstract void findAndSetChild(Expression oldExpr, Expression newExpr);
  
    public abstract String getString();
  
    public abstract String getStatement();
  
    public boolean isAlreadyResolved() {
      return isAlreadyResolved;
    }
  
    public void setAlreadyResolved(boolean alreadyResolved) {
      isAlreadyResolved = alreadyResolved;
    }
  }
  