| /* |
| * 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.drill.exec.store.easy.json.parser; |
| |
| /** |
| * Parses a JSON value. JSON allows any value type to appear anywhere a |
| * value is allowed; this parser reflects that rule. The associated listener |
| * is responsible for semantics: whether a given value should be allowed. |
| * <p> |
| * Scalar value processing occurs in one of two ways: |
| * <ul> |
| * <li><b>Typed</b>: The type of the JSON value determines which of the |
| * listener "on" method is called. This ensures that the JSON text |
| * is parsed into typed values using JSON's parsing rules.</li> |
| * <li><b>Text</b>: The text value is passed to the listener's |
| * {@code onString()} method regardless of the JSON type. (That is, |
| * according to Drill's "all-text mode."</li> |
| * </ul> |
| * Listeners can enforce one type only, or can be more flexible and |
| * allow multiple types. |
| */ |
| public abstract class ValueParser extends AbstractElementParser { |
| |
| protected ValueListener listener; |
| |
| public ValueParser(JsonStructureParser structParser, ValueListener listener) { |
| super(structParser); |
| this.listener = listener; |
| } |
| } |