org.pac4j.oauth.profile.JsonHelper.java Source code

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Here is the source code for org.pac4j.oauth.profile.JsonHelper.java

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/*
  Copyright 2012 - 2015 pac4j organization
    
   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 org.pac4j.oauth.profile;

import java.io.IOException;

import org.pac4j.core.profile.converter.AttributeConverter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;

/**
 * This class is an helper to work with JSON.
 *
 * @author Jerome Leleu
 * @since 1.0.0
 */
public final class JsonHelper {

    private static final Logger logger = LoggerFactory.getLogger(JsonHelper.class);

    private static ObjectMapper mapper = new ObjectMapper();

    /**
     * Return the first node of a JSON response.
     *
     * @param text JSON text
     * @return the first node of the JSON response or null if exception is thrown
     */
    public static JsonNode getFirstNode(final String text) {
        try {
            return mapper.readValue(text, JsonNode.class);
        } catch (final JsonParseException e) {
            logger.error("JsonParseException", e);
        } catch (final JsonMappingException e) {
            logger.error("JsonMappingException", e);
        } catch (final IOException e) {
            logger.error("IOException", e);
        }
        return null;
    }

    /**
     * Return the field with name in JSON (a string, a boolean, a number or a node).
     *
     * @param json json
     * @param name node name
     * @return the field
     */
    public static Object get(final JsonNode json, final String name) {
        if (json != null && name != null) {
            JsonNode node = json;
            for (String nodeName : name.split("\\.")) {
                if (node != null) {
                    node = node.get(nodeName);
                }
            }
            if (node != null) {
                if (node.isNumber()) {
                    return node.numberValue();
                } else if (node.isBoolean()) {
                    return node.booleanValue();
                } else if (node.isTextual()) {
                    return node.textValue();
                } else {
                    return node;
                }
            }
        }
        return null;
    }

    /**
     * Convert a JSON attribute.
     *
     * @param converter converter
     * @param json json
     * @param name attribute name
     * @return the converted JSON attribute
     */
    public static Object convert(final AttributeConverter<? extends Object> converter, final JsonNode json,
            final String name) {
        return converter.convert(get(json, name));
    }
}