JsonUtils.java

package com.apigee.sdk.data.client.utils;

import java.io.IOException;
import java.util.Map;
import java.util.UUID;

import com.apigee.sdk.data.client.exception.ClientException;
import com.fasterxml.jackson.core.JsonGenerationException;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.JsonNodeFactory;

public class JsonUtils {


	static ObjectMapper mapper = new ObjectMapper();

	public static String getStringProperty(Map<String, JsonNode> properties,
			String name) {
		JsonNode value = properties.get(name);
		if (value != null) {
			return value.asText();
		}
		return null;
	}

	public static void setStringProperty(Map<String, JsonNode> properties,
			String name, String value) {
		if (value == null) {
			properties.remove(name);
		} else {
			properties.put(name, JsonNodeFactory.instance.textNode(value));
		}
	}

	public static Long getLongProperty(Map<String, JsonNode> properties,
			String name) {
		JsonNode value = properties.get(name);
		if (value != null) {
			return value.asLong(0);
		}
		return null;
	}

	public static void setLongProperty(Map<String, JsonNode> properties,
			String name, Long value) {
		if (value == null) {
			properties.remove(name);
		} else {
			properties.put(name, JsonNodeFactory.instance.numberNode(value));
		}
	}

	public static void setFloatProperty(Map<String, JsonNode> properties, String name, Float value){
	    if(value == null){
	        properties.remove(name);
	    }else{
	        properties.put(name, JsonNodeFactory.instance.numberNode(value));
	    }
	}
	
	public static Boolean getBooleanProperty(Map<String, JsonNode> properties,
			String name) {
		JsonNode value = properties.get(name);
		if (value != null) {
			return value.asBoolean();
		}
		return false;
	}

	public static void setBooleanProperty(Map<String, JsonNode> properties,
			String name, Boolean value) {
		if (value == null) {
			properties.remove(name);
		} else {
			properties.put(name, JsonNodeFactory.instance.booleanNode(value));
		}
	}

	public static UUID getUUIDProperty(Map<String, JsonNode> properties,
			String name) {
		JsonNode value = properties.get(name);
		if (value != null) {
			UUID uuid = null;
			try {
				uuid = UUID.fromString(value.asText());
			} catch (Exception e) {
			}
			return uuid;
		}
		return null;
	}

	public static void setUUIDProperty(Map<String, JsonNode> properties,
			String name, UUID value) {
		if (value == null) {
			properties.remove(name);
		} else {
			properties.put(name,
					JsonNodeFactory.instance.textNode(value.toString()));
		}
	}

	public static String toJsonString(Object obj) {
		try {
			return mapper.writeValueAsString(obj);
		} catch (JsonGenerationException e) {
			throw new ClientException("Unable to generate json", e);
		} catch (JsonMappingException e) {
		    throw new ClientException("Unable to map json", e);
		} catch (IOException e) {
		    throw new ClientException("IO error", e);
		}
	}

	public static <T> T parse(String json, Class<T> c) {
		try {
			return mapper.readValue(json, c);
		} catch (JsonGenerationException e) {
            throw new ClientException("Unable to generate json", e);
        } catch (JsonMappingException e) {
            throw new ClientException("Unable to map json", e);
        } catch (IOException e) {
            throw new ClientException("IO error", e);
        }
	}

	public static JsonNode toJsonNode(Object obj) {
		return mapper.convertValue(obj, JsonNode.class);
	}

	public static <T> T fromJsonNode(JsonNode json, Class<T> c) {
		try {
			JsonParser jp = json.traverse();
			return mapper.readValue(jp, c);
		} catch (JsonGenerationException e) {
            throw new ClientException("Unable to generate json", e);
        } catch (JsonMappingException e) {
            throw new ClientException("Unable to map json", e);
        } catch (IOException e) {
            throw new ClientException("IO error", e);
        }
	}

	public static <T> T getObjectProperty(Map<String, JsonNode> properties,
			String name, Class<T> c) {
		JsonNode value = properties.get(name);
		if (value != null) {
			return fromJsonNode(value, c);
		}
		return null;
	}

	public static void setObjectProperty(Map<String, JsonNode> properties,
			String name, Object value) {
		if (value == null) {
			properties.remove(name);
		} else {
			properties.put(name,
					JsonNodeFactory.instance.textNode(value.toString()));
		}
	}

}