org.apache.drill.exec.store.http.util.JsonConverter.java Source code

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Here is the source code for org.apache.drill.exec.store.http.util.JsonConverter.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.exec.store.http.util;

import java.io.FileInputStream;
import java.io.IOException;

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.common.base.Charsets;

public class JsonConverter {
    public static JsonNode parse(String content, String key) {
        String[] path = key.split("/");
        try {
            JsonNode node = from(content);
            for (String p : path) {
                if (node == null) {
                    return null;
                }
                node = node.get(p);
            }
            return node;
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }

    public static JsonNode parse(String content) {
        try {
            JsonNode root = from(content);
            if (root.isArray()) {
                return root;
            }
            return null;
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }

    @SuppressWarnings("resource")
    public static String stringFromFile(String file) {
        try {
            FileInputStream stream = new FileInputStream(file);
            int size = stream.available();
            byte[] bytes = new byte[size];
            stream.read(bytes);
            return new String(bytes, Charsets.UTF_8);
        } catch (IOException e) {
        }
        return "";
    }

    private static JsonNode from(String content) throws IOException {
        ObjectMapper mapper = new ObjectMapper();
        JsonNode root = mapper.readTree(content);
        return root;
    }
}