/*
 * 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.olingo.server.core.uri.queryoption.expression;

import java.util.Collections;
import java.util.List;

import org.apache.olingo.commons.api.edm.EdmEnumType;
import org.apache.olingo.server.api.ODataApplicationException;
import org.apache.olingo.server.api.uri.queryoption.expression.Enumeration;
import org.apache.olingo.server.api.uri.queryoption.expression.ExpressionVisitException;
import org.apache.olingo.server.api.uri.queryoption.expression.ExpressionVisitor;

public class EnumerationImpl implements Enumeration {

  private final EdmEnumType type;
  private final List<String> values;

  public EnumerationImpl(final EdmEnumType type, final List<String> values) {
    this.type = type;
    this.values = values;
  }

  @Override
  public EdmEnumType getType() {
    return type;
  }

  @Override
  public List<String> getValues() {
    return values == null ?
        Collections.<String> emptyList() :
        Collections.unmodifiableList(values);
  }

  @Override
  public <T> T accept(final ExpressionVisitor<T> visitor) throws ExpressionVisitException, ODataApplicationException {
    return visitor.visitEnum(type, values);
  }

  @Override
  public String toString() {
    return type == null ? "NULL" :
      type.getFullQualifiedName().getFullQualifiedNameAsString() + getValues();
  }
}
