| /* |
| * 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; |
| |
| import com.fasterxml.jackson.core.JsonToken; |
| |
| public abstract class ScalarValueParser extends ValueParser { |
| |
| public ScalarValueParser(JsonStructureParser structParser, ValueListener listener) { |
| super(structParser, listener); |
| } |
| |
| /** |
| * Parses <code>true | false | null | integer | float | string| |
| * embedded-object</code> |
| */ |
| @Override |
| public void parse(TokenIterator tokenizer) { |
| JsonToken token = tokenizer.requireNext(); |
| if (token.isScalarValue()) { |
| parseValue(tokenizer, token); |
| } else { |
| throw errorFactory().structureError("Structure value found where scalar expected"); |
| } |
| } |
| |
| protected abstract void parseValue(TokenIterator tokenizer, JsonToken token); |
| |
| /** |
| * Parses <code>true | false | null | integer | float | string |<br> |
| * embedded-object</code><br> |
| * and simply passes the value token on to the listener. |
| */ |
| public static class SimpleValueParser extends ScalarValueParser { |
| |
| public SimpleValueParser(JsonStructureParser structParser, ValueListener listener) { |
| super(structParser, listener); |
| } |
| |
| @Override |
| public void parseValue(TokenIterator tokenizer, JsonToken token) { |
| listener.onValue(token, tokenizer); |
| } |
| } |
| |
| /** |
| * Parses <code>true | false | null | integer | float | string |<br> |
| * embedded-object</code> |
| * <p> |
| * Forwards the result as a string. |
| */ |
| public static class TextValueParser extends ScalarValueParser { |
| |
| public TextValueParser(JsonStructureParser structParser, ValueListener listener) { |
| super(structParser, listener); |
| } |
| |
| @Override |
| public void parseValue(TokenIterator tokenizer, JsonToken token) { |
| if (token == JsonToken.VALUE_NULL) { |
| listener.onValue(token, tokenizer); |
| } else { |
| listener.onText( |
| token == JsonToken.VALUE_NULL ? null : tokenizer.textValue()); |
| } |
| } |
| } |
| } |