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chaschev.util.MapObjectUtils Maven / Gradle / Ivy
package chaschev.util;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import javax.xml.stream.XMLOutputFactory;
import javax.xml.stream.XMLStreamWriter;
import java.io.*;
import java.util.*;
/**
* User: chaschev
* Date: 5/15/13
*/
/**
* Provides utility methods over map objects
*
* Map object is a Map of Maps or Lists, typically an in-memory representation for a JSON object.
*/
public class MapObjectUtils {
public static class Objects{
public static boolean equals(Object a, Object b) {
return (a == b) || (a != null && a.equals(b));
}
}
public static void clean(Collection l){
cleanCollection(l);
}
public static Map pathToMap(Map mapObject, String path){
if(mapObject == null) return null;
final String[] split = path.split("/");
for (int i = 0; i < split.length; i++) {
String s = split[i];
final Object o = mapObject.get(s);
if(!(o instanceof Map)) {
if(o instanceof Collection){
throw new IllegalStateException("expected map, found collection");
}
return null;
}
mapObject = (Map) o;
}
return mapObject;
}
public static Object pathToItem(Map mapObject, String path, int n){
return pathToList(mapObject, path).get(n);
}
public static List pathToList(Map mapObject, String path){
return (List) pathToCollection(mapObject, path);
}
public static Collection pathToCollection(Map mapObject, String path){
final String[] split = path.split("/");
final int length = split.length;
for (int i = 0; i < length; i++) {
String s = split[i];
final Object o = mapObject.get(s);
if(i == length - 1){
if(!(o instanceof Collection)) {
if (o instanceof Map) {
throw new IllegalStateException("collection expected, but found map");
}
return null;
}
return (Collection) o;
}
if(!(o instanceof Map)) return null;
mapObject = (Map) o;
}
return null;
}
public static Map having(Collection collection, String field, Object value){
for (Object o : collection) {
if (o instanceof Map) {
Map map = (Map) o;
if(Objects.equals(value, map.get(field))){
return map;
}
}
}
return null;
}
public static Map having(
Collection collection,
String field1, Object value1,
String field2, Object value2
) {
for (Object o : collection) {
if (o instanceof Map) {
Map map = (Map) o;
if (Objects.equals(value1, map.get(field1)) &&
Objects.equals(value2, map.get(field2))) {
return map;
}
}
}
return null;
}
public static Map fromJSON(Reader is){
try {
//todo migrate to ObjectReader which is thread-safe: http://wiki.fasterxml.com/ObjectReader
ObjectMapper mapper = new ObjectMapper();
// ObjectReader reader = mapper.reader();
return mapper.readValue(is,
new TypeReference>() {});
} catch (IOException e) {
throw Exceptions.runtime(e);
}
}
public static Map fromJSON(InputStream is){
try {
ObjectMapper mapper = new ObjectMapper();
return mapper.readValue(is,
new TypeReference>() {});
} catch (IOException e) {
throw Exceptions.runtime(e);
}
}
public static Map fromJSON(String content){
try {
ObjectMapper mapper = new ObjectMapper();
return mapper.readValue(content,
new TypeReference>() {});
} catch (IOException e) {
throw Exceptions.runtime(e);
}
}
public static String toJSON(Map map){
return toJSON((Object) map);
}
public static String toJSON(Object pojo){
try {
ObjectMapper mapper = new ObjectMapper();
StringWriter sw = new StringWriter(50 * 1024);
mapper.writeValue(sw, pojo);
return sw.toString();
} catch (IOException e) {
throw Exceptions.runtime(e);
}
}
protected static void cleanCollection(Collection collection)
{
final Iterator iterator = collection.iterator();
while (iterator.hasNext()) {
Object o = iterator.next();
if (o == null) {
iterator.remove();
}else
if (o instanceof Collection) {
Collection oColl = (Collection) o;
if (oColl.isEmpty()) {
iterator.remove();
} else {
clean(oColl);
if(oColl.isEmpty()){
iterator.remove();
}
}
} else if (o instanceof Map) {
Map oMap = (Map) o;
if (oMap.isEmpty()) {
iterator.remove();
} else {
clean(oMap);
if(oMap.isEmpty()){
iterator.remove();
}
}
} else if (o instanceof String) {
String oString = (String) o;
if (oString.isEmpty()) {
iterator.remove();
}
}
}
}
/**
* Remove empty items (empty lists, maps, strings) from the MapObject.
*/
public static void clean(Map mapObject){
clean(mapObject.values());
}
public static String toXML(Map object){
final ByteArrayOutputStream baos = new ByteArrayOutputStream();
toXML(object, baos);
return baos.toString();
}
public static void toXML(Map object, OutputStream stream){
try {
final XMLOutputFactory factory = XMLOutputFactory.newFactory();
final XMLStreamWriter writer = factory.createXMLStreamWriter(stream);
new XmlStreamCreator(writer).toXMLRec(object, writer);
writer.flush();
stream.flush();
} catch (Exception e) {
throw new RuntimeException(e);
}
}
public static Document toDomXML(Map object){
try {
final DomBuilder b = new DomBuilder();
toDomXMLRec(object, b.document, b);
return b.document;
} catch (Exception e) {
throw new RuntimeException(e);
}
}
private static void toDomXMLRec(Map object, Node parent, DomBuilder b) {
final Set set = object.entrySet();
for (Map.Entry entry : set) {
final Object key = entry.getKey();
final Object value = entry.getValue();
if (isSimpleValue(value)) {
String s = value.toString();
((Element)parent).setAttribute(key.toString(), s);
}else
if (value instanceof Collection) {
toDomXMLRec((Collection) value, b.newElement(parent, key.toString()), b);
}else if (value instanceof Map) {
toDomXMLRec((Map) value, b.newElement(parent, key.toString()), b);
}
}
}
private static boolean isSimpleValue(Object value) {
return value instanceof String || value instanceof Number || value instanceof Date;
}
private static void toDomXMLRec(Collection list, Element parent, DomBuilder b){
for (Object o : list) {
final Element item = b.newElement(parent, "item");
if (isSimpleValue(o)) {
b.addTextNode(item, o.toString());
}else
if(o instanceof Collection){
toDomXMLRec((Collection) o, item, b);
}
else
if(o instanceof Map){
toDomXMLRec((Map) o, item, b);
}
}
}
private static class XmlStreamCreator {
XMLStreamWriter writer;
List attributes = new ArrayList();
private XmlStreamCreator(XMLStreamWriter writer) {
this.writer = writer;
}
private void toXMLRec(Collection list, XMLStreamWriter writer) throws Exception{
for (Object o : list) {
writer.writeStartElement("item");
if (isSimpleValue(o)) {
writer.writeCharacters(o.toString());
}else
if(o instanceof Collection){
toXMLRec((Collection)o, writer);
}
else
if(o instanceof Map){
toXMLRec((Map)o, writer);
}
writer.writeEndElement();
}
}
private void toXMLRec(Map object, XMLStreamWriter writer) throws Exception{
final Set set = object.entrySet();
attributes.clear();
for (Map.Entry entry : set) {
if (isSimpleValue(entry.getValue())) {
attributes.add(entry);
}
}
for (Map.Entry attribute : attributes) {
writer.writeAttribute(attribute.getKey().toString(), attribute.getValue().toString());
}
for (Map.Entry entry : set) {
final Object key = entry.getKey();
final Object value = entry.getValue();
if (value instanceof Collection) {
writer.writeStartElement(key.toString());
toXMLRec((Collection) value, writer);
writer.writeEndElement();
}else if (value instanceof Map) {
Map map = (Map) value;
writer.writeStartElement(key.toString());
toXMLRec(map, writer);
writer.writeEndElement();
}
}
}
}
}
