/*******************************************************************************
 * 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 com.sap.core.odata.api.edm.EdmType;
import com.sap.core.odata.api.exception.ODataApplicationException;
import com.sap.core.odata.api.uri.expression.CommonExpression;
import com.sap.core.odata.api.uri.expression.ExceptionVisitExpression;
import com.sap.core.odata.api.uri.expression.ExpressionKind;
import com.sap.core.odata.api.uri.expression.ExpressionVisitor;
import com.sap.core.odata.api.uri.expression.FilterExpression;

/**
 * @author SAP AG
 */
public class FilterExpressionImpl implements FilterExpression {
  private final String filterString;
  private EdmType edmType;
  private CommonExpression commonExpression;

  public FilterExpressionImpl(final String filterExpression) {
    filterString = filterExpression;
  }

  public FilterExpressionImpl(final String filterExpression, final CommonExpression childExpression) {
    filterString = filterExpression;
    commonExpression = childExpression;
  }

  @Override
  public String getExpressionString() {
    return filterString;
  }

  @Override
  public CommonExpression getExpression() {
    return commonExpression;
  }

  @Override
  public Object accept(final ExpressionVisitor visitor) throws ExceptionVisitExpression, ODataApplicationException {
    Object retCommonExpression = commonExpression.accept(visitor);

    return visitor.visitFilterExpression(this, filterString, retCommonExpression);
  }

  @Override
  public CommonExpression setEdmType(final EdmType edmType) {
    this.edmType = edmType;
    return this;
  }

  @Override
  public EdmType getEdmType() {
    return edmType;
  }

  @Override
  public ExpressionKind getKind() {
    return ExpressionKind.FILTER;
  }

  @Override
  public String getUriLiteral() {
    return getExpressionString();
  }

}