| /* |
| * 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.solr.analytics; |
| |
| import org.apache.solr.analytics.function.ReductionCollectionManager; |
| import org.apache.solr.analytics.function.ReductionCollectionManager.ReductionDataCollection; |
| import org.apache.solr.analytics.value.AnalyticsValue; |
| |
| /** |
| * A wrapper for a top-level analytics expression. |
| * The expression must have a name and be single valued. |
| */ |
| public class AnalyticsExpression { |
| private final AnalyticsValue expression; |
| private final String name; |
| |
| public AnalyticsExpression(String name, AnalyticsValue expression) { |
| this.name = name; |
| this.expression = expression; |
| } |
| |
| public String getName() { |
| return name; |
| } |
| |
| public AnalyticsValue getExpression() { |
| return expression; |
| } |
| |
| /** |
| * Get the current value of the expression. |
| * This method can, and will, be called multiple times to return different values. |
| * The value returned is based on the {@link ReductionDataCollection} given |
| * to the {@link ReductionCollectionManager#setData} method. |
| * |
| * @return the current value of the expression |
| */ |
| public Object toObject() { |
| return expression.getObject(); |
| } |
| |
| /** |
| * NOTE: Must be called after {@link #toObject()} is called, otherwise the value is not guaranteed to be correct. |
| * |
| * @return whether the current value of the expression exists. |
| */ |
| public boolean exists() { |
| return expression.exists(); |
| } |
| } |