JsonMaker.java

import java.util.Collection;
import java.util.HashMap;
import java.util.Map.Entry;
import java.util.Set;

/**
 * <h2> 
 * JsonMaker.java <br/>
 * </h2><br/><br/>
 * 
 * @author		beom (ice3x2@gmail.com)
 * @Synce		2015. 11. 20.
 * @Version   1
 */
public class JsonMaker {

	public static ObjectMaker<ObjectMaker<?>> openObject(String key) {
		ObjectMaker<JsonObjectAlreadyRoot> objectMaker =  new ObjectMaker<JsonObjectAlreadyRoot>(JsonObjectAlreadyRoot.ontain());
		return objectMaker.openObject(key);
	}
	
	
	public static <T> ObjectMaker<JsonObjectAlreadyRoot> put(String key,T value ) {
		return new ObjectMaker<JsonObjectAlreadyRoot>(JsonObjectAlreadyRoot.ontain()).put(key, value);
	}

	public static <T> ObjectMaker<JsonObjectAlreadyRoot> putString(String key,T value ) {
		return new ObjectMaker<JsonObjectAlreadyRoot>(JsonObjectAlreadyRoot.ontain()).putString(key, value);
	}
	
	public static <T> ObjectMaker<JsonObjectAlreadyRoot> putBoolean(String key,T value ) {
		return new ObjectMaker<JsonObjectAlreadyRoot>(JsonObjectAlreadyRoot.ontain()).putBoolean(key, value);
	}


	public static <T extends Number> ObjectMaker<JsonObjectAlreadyRoot> putInteger(String key, T value) {
		return new ObjectMaker<JsonObjectAlreadyRoot>(JsonObjectAlreadyRoot.ontain()).putInteger(key, value);
	}

	public static <T> ObjectMaker<JsonObjectAlreadyRoot> putInteger(String key,T value) {
		return new ObjectMaker<JsonObjectAlreadyRoot>(JsonObjectAlreadyRoot.ontain()).putInteger(key, value);
	}

	

	public static <T extends Number> ObjectMaker<JsonObjectAlreadyRoot> putFloat(String key, T value) {
		return new ObjectMaker<JsonObjectAlreadyRoot>(JsonObjectAlreadyRoot.ontain()).putFloat(key, value);
	}
	

	public static <T> ObjectMaker<JsonObjectAlreadyRoot> putFloat(String key,T value) {
		return new ObjectMaker<JsonObjectAlreadyRoot>(JsonObjectAlreadyRoot.ontain()).putFloat(key, value);
	}

	public static ArrayElementMaker<ObjectMaker<JsonObjectAlreadyRoot>> openArray(String key) {
		return new ObjectMaker<JsonObjectAlreadyRoot>(JsonObjectAlreadyRoot.ontain()).openArray(key);
	}
	
	public static class JsonObjectAlreadyRoot {
		private JsonObjectAlreadyRoot() {}
		private static JsonObjectAlreadyRoot ontain() {
			return new JsonObjectAlreadyRoot();
		}
	}

	

	

	public static class ObjectMaker<E> {

		protected HashMap<String, Object> mStoreMap = new HashMap<String, Object>();
		private E mObjectMakerParents = null;
		
		
		public ObjectMaker(E parent) {
			mObjectMakerParents = parent;
		}
		
		public ObjectMaker<ObjectMaker<?>> openObject(String key) {
			ObjectMaker<ObjectMaker<?>> objectMaker = null;
			Object object = mStoreMap.get(key);
			if(object == null || object.getClass().equals(ObjectMaker.class)) {
				object = null; 
				mStoreMap.remove(key);
				objectMaker = new ObjectMaker<ObjectMaker<?>>(this);
				mStoreMap.put(key, objectMaker);
			}
			return objectMaker;
		}

		public E closeObject() {
			return mObjectMakerParents;
		}
		
		public <T> ObjectMaker<E> put(String key,T value ) {
			if(value instanceof Float || value instanceof Double) { 
				return putFloat(key, value);
			} else if(value instanceof Number) { 
				return putInteger(key, value);
			} else if(isBooleanType(value)) {
				return putBoolean(key, value);
			} 
			return putString(key, value);
		}

		public <T> ObjectMaker<E> putString(String key,T value ) {
			String str = value == null?"null":value.toString();
			mStoreMap.put(key,str);
			return this;
		}


		public <T extends Number> ObjectMaker<E> putInteger(String key, T value) {
			mStoreMap.put(key,value.longValue());
			return this;
		}			

		public <T> ObjectMaker<E> putInteger(String key,T value) {
			String str = value == null?"null":value.toString();
			long number = 0;
			try {
				number = Long.parseLong(str);
			} catch(NumberFormatException e) {}
			mStoreMap.put(key,number);
			return this;
		}
		
		public <T> ObjectMaker<E> putBoolean(String key,T value) {
			String str = value == null?"null":value.toString().toLowerCase().trim();
			mStoreMap.put(key,str.equals("true"));
			return this;
		}
		

		public <T extends Number> ObjectMaker<E> putFloat(String key, T value) {
			mStoreMap.put(key,value.doubleValue());
			return this;
		}
		
		public <T> ObjectMaker<E> putFloat(String key,T value) {
			String str = value == null?"null":value.toString();
			double number = 0;
			try {
				number = Double.parseDouble(str);
			} catch(NumberFormatException e) {}
			mStoreMap.put(key,number);
			return this;
		}	
		
		public <T> ObjectMaker<E> putArray(String key,Collection<T> arrayValues) {
			if(arrayValues == null) {
				return putString(key, null);
			}
			ArrayElementMaker<ObjectMaker<E>> arrayElementMaker = openArray(key);
			for(T value : arrayValues) {
				arrayElementMaker = arrayElementMaker.next(value);
			}
			return arrayElementMaker.closeArray();
		}
		

		public ArrayElementMaker<ObjectMaker<E>> openArray(String key) {
			
			ArrayElementMaker<ObjectMaker<E>> arrayObjectMaker = null;
			Object object = mStoreMap.get(key);

			if(object == null || object.getClass().equals(ArrayElementMaker.class)) {
				object = null; 
				mStoreMap.remove(key);
				arrayObjectMaker = new ArrayElementMaker<ObjectMaker<E>>(this);
				mStoreMap.put(key, arrayObjectMaker);
			}
			return arrayObjectMaker;
		}

		private void make(StringBuffer buffer) {
			buffer.append("{");
			Set<Entry<String, Object>> keyValueSet = mStoreMap.entrySet();
			int count = 0, endIndex = keyValueSet.size() - 1; 
			for(Entry<String, Object> entry : keyValueSet) {
				Object value = entry.getValue();
				Object key = entry.getKey();
				buffer.append('"').append(key).append('"').append(':');
				appendValueToString(buffer, value);
				if(count != endIndex) {
					buffer.append(",");
				}
				++count;
			}
			buffer.append("}");
		}
		
		
		@Override
		public String toString() {
			ObjectMaker<?> rootObj = findRoot(this, mObjectMakerParents);
			if(rootObj == this) {
				StringBuffer stringBuffer = new StringBuffer();
				make(stringBuffer);
				releaseRef();
				return stringBuffer.toString();
			} else {
				return rootObj.toString();
			}
		}
		
		
		private void releaseRef() {
			Collection<Object> values =  mStoreMap.values();
			for(Object value : values) {
				if(value instanceof ObjectMaker<?>) {
					((ObjectMaker<?>)value).releaseRef();
					((ObjectMaker<?>)value).mObjectMakerParents = null;
				} else if(value instanceof ArrayElementMaker<?>) {
					((ArrayElementMaker<?>)value).releaseRef();
				}
			}
			mStoreMap.clear();
		}
	}

	public static class ArrayElementMaker<E> {

		private Object mValue;
		protected E mUpper = null;
		
		private ArrayElementMaker<?> mNext;
		private ArrayElementMaker<?> mPrev;
		
		

		ArrayElementMaker(E upper) {
			mUpper = upper;
		}			

		public ObjectMaker<ArrayElementMaker<E>> nextObject() {
			ArrayElementMaker<E> arrayObjectMaker = new ArrayElementMaker<E>(mUpper);
			ObjectMaker<ArrayElementMaker<E>> objectMaker = new ObjectMaker<ArrayElementMaker<E>>(arrayObjectMaker);
			arrayObjectMaker.mValue = objectMaker;
			mNext = arrayObjectMaker;
			arrayObjectMaker.mPrev = this;
			return objectMaker; 
		}
		
		public <T> ArrayElementMaker<E> next(T value) {
			if(value instanceof Float || value instanceof Double) { 
				return nextFloat((Number)value);
			} else if(value instanceof Number) { 
				return nextInteger((Number)value);
			} else if(isBooleanType(value)) {
				return nextBoolean(value);
			} 
			return nextString(value.toString());
		}

		public <T> ArrayElementMaker<E> nextString(T value) {
			String str = value == null?"null":value.toString();
			ArrayElementMaker<E> arrayElementMaker = new ArrayElementMaker<E>(mUpper);
			return link(arrayElementMaker, str);
		}
		
		public <T> ArrayElementMaker<E> nextBoolean(T value) {
			ArrayElementMaker<E> arrayElementMaker = new ArrayElementMaker<E>(mUpper);
			String str = value == null?"null":value.toString().toLowerCase().trim();
			return link(arrayElementMaker, str.equals("true"));
		}

		public <T extends Number> ArrayElementMaker<E> nextInteger(T value) {
			ArrayElementMaker<E> arrayElementMaker = new ArrayElementMaker<E>(mUpper);
			return link(arrayElementMaker, value.longValue());
		}

		

		public <T> ArrayElementMaker<E> nextInteger(T value) {
			ArrayElementMaker<E> arrayElementMaker = new ArrayElementMaker<E>(mUpper);
			String str = value == null?"null":value.toString();
			long number = 0;
			try {
				number = Long.parseLong(str);
			} catch(NumberFormatException e) {}
			return link(arrayElementMaker, number);
		}


		public <T extends Number> ArrayElementMaker<E> nextFloat(T value) {
			ArrayElementMaker<E> arrayElementMaker = new ArrayElementMaker<E>(mUpper);
			return link(arrayElementMaker, value.doubleValue());
		}
		
		private ArrayElementMaker<E> link(ArrayElementMaker<E> arrayElementMaker,Object value) {
			arrayElementMaker.mValue = value;
			mNext = arrayElementMaker;
			arrayElementMaker.mPrev = this;
			return arrayElementMaker;
		}
		
		
		

		public <T> ArrayElementMaker<E> nextFloat(String value) {
			ArrayElementMaker<E> arrayObjectMaker = new ArrayElementMaker<E>(mUpper);
			String str = value == null?"null":value.toString();
			double number = 0;
			try {
				number = Double.parseDouble(str);
			} catch(NumberFormatException e) {}			
			arrayObjectMaker.mValue = number;
			mNext = arrayObjectMaker;
			arrayObjectMaker.mPrev = this;
			return arrayObjectMaker;
		}
		
		public E closeArray() {
			return mUpper;
		}
		
		
		
		private ArrayElementMaker<?> toHead() {
			ArrayElementMaker<?> node = this;
			while(node.mPrev != null) {
				node = node.mPrev;
			}
			return node;
 		}
		
		private void make(StringBuffer buffer) {
			ArrayElementMaker<?> node, headNode = toHead();
			node = headNode;
			buffer.append("[");
			while(node != null) {
				Object value = node.mValue;
				if(value == null) {
					node = node.mNext; 
					continue;
				}
				else {
					appendValueToString(buffer, value);
				}
				buffer.append(",");
				node = node.mNext;
			}
			if(buffer.charAt(buffer.length() - 1) == ',') {
				buffer.replace(buffer.length() - 1, buffer.length(), "]");
			} else {
				buffer.append("]");
			}
		}
		
		protected void releaseRef() {
			ArrayElementMaker<?> node, headNode = toHead();
			node = headNode;
			while(node.mNext != null) {
				ArrayElementMaker<?> nextNode = node.mNext;
				node.mNext = null;
				node.mPrev = null;
				node.mUpper = null;
				if(node.mValue instanceof ArrayElementMaker<?>) {
					((ArrayElementMaker<?>)node.mValue).releaseRef();
				} else if(node.mValue instanceof ObjectMaker<?>) {
					((ObjectMaker<?>)node.mValue).releaseRef();
				}
				node = nextNode;
			}
		}
		
		@Override
		public String toString() {
			ObjectMaker<?> rootObj = findRoot(this, mUpper);
			return rootObj.toString();
		}
		
	}
	
	
	private static <T> boolean isBooleanType(T value) {
		if(value == null) return false; 
		String str = value.toString(); 
		str = str.toString().toLowerCase().trim();
		return str.equals("true") || str.equals("false");
	}
	
	private static void appendValueToString(StringBuffer buffer, Object value) {
		if(value instanceof CharSequence) {
			if(value.equals("null")) {
				buffer.append(value);
			} else {
				buffer.append('"').append(value).append('"');
			}
			
		} else if(value instanceof  ObjectMaker) {
			((ObjectMaker<?>)value).make(buffer);
		} else if(value instanceof ArrayElementMaker) {
			((ArrayElementMaker<?>)value).make(buffer);
		} else {
			buffer.append(value.toString());
		}
	}
	
	
	private static ObjectMaker<?> findRoot(Object startObj, Object parent) {
		Object node = parent;
		Object prevNode = startObj;
		while(!(node instanceof JsonObjectAlreadyRoot)) {
			prevNode = node;
			if(node instanceof ArrayElementMaker) {
				node = ((ArrayElementMaker<?>)node).mUpper;
			} else if(node instanceof ObjectMaker) {
				node = ((ObjectMaker<?>)node).mObjectMakerParents;
			}
		}
		return (ObjectMaker<?>)prevNode;
	}
}

/*Copyright (c) 2015 Beom ice3x2@gmail.com

Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation
files (the "Software"), to deal in the Software without
restriction, including without limitation the rights to use,
copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following
conditions:

The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.*/

Description

• JsonMaker is useful to create a simple and one-off Json data.
• Calling the 'toString()' method , all data of internal is removed. Therefore, it can not be reused. (It is intended to prevent memory leaks. I will solve this issue. )

How to use

String jsonValue = JsonMaker.put("success", true).put("id", 1024)
              .openArray("items").next(0).next(7).next(9).next(12).closeArray()
              .openObject("status")
                        .put("method", "get")
                        .put("code", 202)
              .closeObject().toString();

jsonValue

{ 
         "success" : true,
         "id" : 1024,
         "items" : [0,7,9,12],
         "status": {
                  "method"  :  "get",
                  "code"   :     202
         }
}