/*******************************************************************************
 * Copyright 2013 SAP AG
 * 
 * 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.sap.core.odata.core.uri.expression;

import java.util.List;

import com.sap.core.odata.api.edm.EdmType;
import com.sap.core.odata.api.uri.expression.UnaryOperator;

/**
 * Describes a unary operator which is allowed in OData expressions
 * @author SAP AG
 */
class InfoUnaryOperator {
  UnaryOperator operator;
  private String category;
  private String syntax;
  ParameterSetCombination combination;

  public InfoUnaryOperator(final UnaryOperator operator, final String category, final ParameterSetCombination combination) {
    this.operator = operator;
    this.category = category;
    syntax = operator.toUriLiteral();
    this.combination = combination;
  }

  public String getCategory() {
    return category;
  }

  public String getSyntax() {
    return syntax;
  }

  public UnaryOperator getOperator() {
    return operator;
  }

  public ParameterSet validateParameterSet(final List<EdmType> actualParameterTypes) throws ExpressionParserInternalError {
    return combination.validate(actualParameterTypes);
  }

  /**
   * Returns the EdmType of the returned value of a Method
   * If a method may have different return types (depending on the input type) null will be returned. 
   */
  /*
  public EdmType getReturnType()
  {
  int parameterCount = allowedParameterTypes.size();
  if (parameterCount == 0)
   return null;

  if (parameterCount == 1)
   return allowedParameterTypes.get(0).getReturnType();

  //There are more than 1 possible return type, check if they are equal, if not return null.
  EdmType returnType = allowedParameterTypes.get(0).getReturnType();
  for (int i = 1; i < parameterCount; i++)
   if (returnType != allowedParameterTypes.get(i))
     return null;

  return returnType;
  }*/

}