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   *  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
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   *    https://www.apache.org/licenses/LICENSE-2.0
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  package org.apache.cayenne.access.translator.ejbql;
  
  import java.util.Collection;
  import java.util.Map;
  
  import org.apache.cayenne.ejbql.EJBQLException;
  
  /**
   * A holder of multi-column match condition operand.
   * 
   * @since 3.0
   */
  public abstract class EJBQLMultiColumnOperand {
  
      static EJBQLMultiColumnOperand getPathOperand(
              EJBQLTranslationContext context,
              Map pathMap) {
          return new PathMultiColumnOperand(context, pathMap);
      }
  
      static EJBQLMultiColumnOperand getObjectOperand(
              EJBQLTranslationContext context,
              Map object) {
          return new ObjectMultiColumnOperand(context, object);
      }
  
      EJBQLTranslationContext context;
      Map map;
  
      Collection getKeys() {
          return map.keySet();
      }
  
      abstract void appendValue(Object key);
  
      private static class PathMultiColumnOperand extends EJBQLMultiColumnOperand {
  
          PathMultiColumnOperand(EJBQLTranslationContext context, Map pathMap) {
              this.context = context;
              this.map = pathMap;
          }
  
          @Override
          void appendValue(Object key) {
  
              Object column = map.get(key);
              if (column == null) {
                  throw new EJBQLException("Invalid match path, no match for ID column "
                          + key);
              }
  
              context.append(' ').append(column.toString());
          }
      }
  
      private static class ObjectMultiColumnOperand extends EJBQLMultiColumnOperand {
  
          ObjectMultiColumnOperand(EJBQLTranslationContext context, Map pathMap) {
              this.context = context;
              this.map = pathMap;
          }
  
          @Override
          void appendValue(Object key) {
              Object value = map.get(key);
              if (value == null) {
                  throw new EJBQLException("Invalid object, no match for ID column " + key);
              }
  
              String var = context.bindParameter(value);
              context.append(" #bind($").append(var).append(')');
          }
      }
  }
  