| /* |
| // Licensed to Julian Hyde under one or more contributor license |
| // agreements. See the NOTICE file distributed with this work for |
| // additional information regarding copyright ownership. |
| // |
| // Julian Hyde 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 net.hydromatic.optiq.impl.csv; |
| |
| import net.hydromatic.linq4j.Enumerator; |
| import net.hydromatic.linq4j.Linq4j; |
| |
| import com.fasterxml.jackson.core.JsonParser; |
| import com.fasterxml.jackson.databind.ObjectMapper; |
| |
| import java.io.*; |
| import java.util.List; |
| |
| /** Enumerator that reads from a JSON file. */ |
| class JsonEnumerator implements Enumerator<Object> { |
| private final Enumerator<Object> enumerator; |
| |
| public JsonEnumerator(File file) { |
| try { |
| final ObjectMapper mapper = new ObjectMapper(); |
| mapper.configure(JsonParser.Feature.ALLOW_UNQUOTED_FIELD_NAMES, true); |
| mapper.configure(JsonParser.Feature.ALLOW_SINGLE_QUOTES, true); |
| mapper.configure(JsonParser.Feature.ALLOW_COMMENTS, true); |
| //noinspection unchecked |
| List<Object> list = mapper.readValue(file, List.class); |
| enumerator = Linq4j.enumerator(list); |
| } catch (IOException e) { |
| throw new RuntimeException(e); |
| } |
| } |
| |
| public Object current() { |
| return enumerator.current(); |
| } |
| |
| public boolean moveNext() { |
| return enumerator.moveNext(); |
| } |
| |
| public void reset() { |
| enumerator.reset(); |
| } |
| |
| public void close() { |
| try { |
| enumerator.close(); |
| } catch (Exception e) { |
| throw new RuntimeException("Error closing JSON reader", e); |
| } |
| } |
| } |
| |
| // End JsonEnumerator.java |