org.apache.drill.common.util.AbstractDynamicBean.java Source code

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Here is the source code for org.apache.drill.common.util.AbstractDynamicBean.java

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/*******************************************************************************
 * 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.common.util;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;

import org.apache.drill.common.exceptions.LogicalPlanParsingException;

import com.fasterxml.jackson.annotation.JsonAnyGetter;
import com.fasterxml.jackson.annotation.JsonAnySetter;
import com.fasterxml.jackson.core.JsonParser.Feature;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
import com.fasterxml.jackson.databind.node.ObjectNode;

/**
 * Captures all properties and turns them into an object node for late bind conversion.
 */
public abstract class AbstractDynamicBean {
    static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(AbstractDynamicBean.class);

    private static volatile ObjectMapper MAPPER;

    private ObjectNode objectNode = new ObjectNode(null);

    @JsonAnySetter
    public void _anySetter(String name, JsonNode value) {
        objectNode.put(name, value);
    }

    @JsonAnyGetter
    public Map<String, JsonNode> _anyGetter() {
        Map<String, JsonNode> unknowns = new HashMap<String, JsonNode>();

        for (Iterator<Entry<String, JsonNode>> i = objectNode.fields(); i.hasNext();) {
            Entry<String, JsonNode> e = i.next();
            unknowns.put(e.getKey(), e.getValue());
        }
        return unknowns;
    }

    public <T> T getWith(Class<T> c) {
        try {
            return getMapper().treeToValue(objectNode, c);
        } catch (JsonProcessingException e) {
            throw new LogicalPlanParsingException(
                    String.format("Failure while trying to convert late bound json type to type of %s.",
                            c.getCanonicalName()),
                    e);
        }
    }

    private static synchronized ObjectMapper getMapper() {
        if (MAPPER == null) {
            ObjectMapper mapper = new ObjectMapper();
            mapper.enable(SerializationFeature.INDENT_OUTPUT);
            mapper.configure(Feature.ALLOW_UNQUOTED_FIELD_NAMES, true);
            mapper.configure(Feature.ALLOW_COMMENTS, true);
            MAPPER = mapper;
        }
        return MAPPER;
    }
}