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    <p>Ok Now the requirement is clear and here is the solution</p> <p>define your operations</p> <pre><code>enum MyOperator { AND, OR } </code></pre> <p>Write a class to hold you atomic operaton</p> <pre><code>class AtomicOperation { Object lhs; Object rhs; MyOperator operator; } </code></pre> <p>Now if You want something like (Year:another values OR (Report:some valeus AND Citation:some valeues))</p> <p>your JSON should look like :</p> <pre><code>String jsonString = {{Year:['2001','2002']} OR {{Report:['Report1']} AND {Citation:['Citation1']}}} </code></pre> <p>So First Cast this JSON to AtominOperation class using the code</p> <pre><code>ConvertJsonToObject.getFromJSON(jsonString,AtominOperation.class); GSON will cast it to a Simple AtominOperation Object with operation "OR" and lhs,rhs as 2 LinkedHashMaps (Default behaviour of GSON) Now use the below method to get the proper AtomicOperation Object from the above AtomicOperation Object. public static AtomicOperation deriveFromJSON(AtomicOperation operation) { if (operation.getLhs().getClass().equals(LinkedHashMap.class)) { AtomicOperation leftOperation = deriveFromJSON(ConvertJsonToObject .getFromJSON(ConvertJsonToObject.toJSON(operation.getLhs()), AtomicOperation.class)); AtomicOperation rightOperation = deriveFromJSON(ConvertJsonToObject .getFromJSON(ConvertJsonToObject.toJSON(operation.getRhs()), AtomicOperation.class)); return new AtomicOperation(leftOperation, operation.getOperator(), rightOperation); } return operation; } </code></pre> <p>The Final AtomicOperation Object would be what u want. :)</p>
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    1. POCreate and read tree data structure from json string dynamically
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    1. USByter
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    1. COI have small question what if user send something like this (Year:another values OR (Report:some valeus AND Citation:some valeues AND Field: another)) . Then the AtomicOperation class is not valid right ?
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    2. COIt Still is. It will look like {{Year:['2001','2002']} OR {{Report:['Report1']} AND {Citation:['Citation1']} AND {Field:another}}} Actually Speaking, you need more operators like EQUAL_TO , IN so that you can write like this {Year IN [values] OR {{Report IN [values]} AND {Citation IN [values]} AND {Field EQUAL_TO "value"}}}
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    3. COHey I'tried with that... But I'm getting an error NullPointerException at deriveFromJSON() first line. If you have written the code could you please post whole code as a answer!
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