com.squarespace.template.JsonUtils.java Source code

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Here is the source code for com.squarespace.template.JsonUtils.java

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/**
 * Copyright (c) 2014 SQUARESPACE, Inc.
 *
 * Licensed 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 com.squarespace.template;

import java.io.IOException;

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ArrayNode;
import com.fasterxml.jackson.databind.node.MissingNode;
import com.fasterxml.jackson.databind.node.ObjectNode;

public class JsonUtils {

    private static final ObjectMapper MAPPER = new ObjectMapper();

    private JsonUtils() {
    }

    public static ObjectNode createObjectNode() {
        return MAPPER.createObjectNode();
    }

    public static JsonNode decode(String input) {
        return decode(input, false);
    }

    /**
     * Attempt to decode the input as JSON. Returns the {@link JsonNode} if
     * the decode is successful.
     *
     * If the decode fails and the {@code failQuietly} flag is true, returns a
     * {@link MissingNode}. Otherwise an {@link IllegalArgumentException} will
     * be thrown.
     */
    public static JsonNode decode(String input, boolean failQuietly) {
        try {
            return MAPPER.readTree(input);
        } catch (IOException e) {
            if (failQuietly) {
                return MissingNode.getInstance();
            }
            throw new IllegalArgumentException("Unable to decode JSON", e);
        }
    }

    public static ArrayNode createArrayNode() {
        return MAPPER.createArrayNode();
    }

    public static ObjectMapper getMapper() {
        return MAPPER;
    }

    /**
     * Compare two JsonNode objects and return an integer.
     *
     * @return  a negative integer, zero, or a positive integer as this object
     *          is less than, equal to, or greater than the specified object.
     */
    public static int compare(JsonNode left, JsonNode right) {
        if (left.isLong() || left.isInt()) {
            return Long.compare(left.asLong(), right.asLong());

        } else if (left.isDouble() || left.isFloat()) {
            return Double.compare(left.asDouble(), right.asDouble());

        } else if (left.isTextual()) {
            return left.asText().compareTo(right.asText());

        } else if (left.isBoolean()) {
            return Boolean.compare(left.asBoolean(), right.asBoolean());
        }

        // Not comparable in a relative sense, default to equals.
        return left.equals(right) ? 0 : -1;
    }

}