Java tutorial
/* * 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.lucene.index; import java.io.IOException; /** * A per-document numeric value. */ public abstract class NumericDocValues extends DocValuesIterator { /** Sole constructor. (For invocation by subclass * constructors, typically implicit.) */ protected NumericDocValues() { } /** * Returns the numeric value for the current document ID. * It is illegal to call this method after {@link #advanceExact(int)} * returned {@code false}. * @return numeric value */ public abstract long longValue() throws IOException; }