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Apache Geode provides a database-like consistency model, reliable transaction processing and a shared-nothing architecture to maintain very low latency performance with high concurrency processing

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/*
 * 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.
 */
/*
 * AbstractIndexCreationHelper.java
 *
 * Created on March 20, 2005, 8:26 PM
 */
package org.apache.geode.cache.query.internal.index;

import java.util.List;

import org.apache.geode.cache.Cache;
import org.apache.geode.cache.Region;
import org.apache.geode.cache.query.*;
import org.apache.geode.cache.query.internal.CompiledValue;
import org.apache.geode.cache.query.internal.QCompiler;

/**
 * 
 */
public abstract class IndexCreationHelper {

  public static int INDEX_QUERY_SCOPE_ID = -2;
  // Canonicalized attributes.
  // The value in these fields is set during the execution of prepareFromClause
  // function
  // While the value of fromClause is reset in execution of prepareFromClause,
  // to canonicalized from clause
  String fromClause;
  String indexedExpression;
  String projectionAttributes;
  // String imports;
  QCompiler compiler; // use the same compiler for each query string to use
  // imports
  Cache cache;
  // Asif : The array containing the canonicalized iterator names
  // which will get reused.
  // TODO: Asif : How to make it final so that the invokers do not end up
  // modifying it
  String[] canonicalizedIteratorNames = null;
  // Asif : Array containing canonicalized iterator definitions
  // TODO: Asif : How to make it final so that the invokers do not end up
  // modifying it
  String[] canonicalizedIteratorDefinitions = null;

  IndexCreationHelper(String fromClause, String projectionAttributes, Cache cache)
      throws IndexInvalidException {
    this.cache = cache;
    // Asif:LThe fromClause,indexedExpression & projectionAttributes
    // will get modified with the canonicalized value , once the
    // constructor of derived class is over.
    this.fromClause = fromClause;
    // this.indexedExpression = indexedExpression;
    this.projectionAttributes = projectionAttributes;
    // this.imports = imports;
    this.compiler = new QCompiler(true /* used from index creation */);
    /*
     * if (this.imports != null) { this.compiler.compileImports(this.imports); }
     */
  }

  public String getCanonicalizedProjectionAttributes() {
    return projectionAttributes;
  }

  /*
   * TODO:Asif . Check if this function is required public String getImports() { return
   * this.imports; }
   */
  public String getCanonicalizedIndexedExpression() {
    return indexedExpression;
  }

  public String getCanonicalizedFromClause() {
    return fromClause;
  }

  public Cache getCache() {
    return cache;
  }

  /*
   * Asif: This function returns the canonicalized Iterator Definitions of the from clauses used in
   * Index creation
   */
  public String[] getCanonicalizedIteratorDefinitions() {
    return this.canonicalizedIteratorDefinitions;
  }

  boolean isMapTypeIndex() {
    return false;
  }

  public abstract List getIterators();

  abstract CompiledValue getCompiledIndexedExpression();

  abstract Region getRegion();
}