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    <p>The JSON String for you query</p> <p>Ok. This is what i tried.</p> <p>(Year:another values OR (Report:some valeus AND Citation:some valeues AND Field: another))</p> <p>should be something like :</p> <pre><code>String json = {"lhs":{"lhs":{"lhs":{"lhs":"Field","rhs":"Value","operator":"EQUAL_TO"},"rhs":{"lhs":"Citation","rhs":"Citation","operator":"EQUAL_TO"},"operator":"AND"},"rhs":{"lhs":"Report","rhs":"Report1","operator":"EQUAL_TO"},"operator":"AND"},"rhs":{"lhs":"Year","rhs":"2001","operator":"EQUAL_TO"},"operator":"OR"} </code></pre> <p>if The MYOperator enum is : </p> <pre><code>public enum MyOperator { AND, OR, EQUAL_TO { @Override public String toString() { return ":"; } }, IN } </code></pre> <p>and AtomicOperation Is</p> <pre><code>public class AtomicOperation { Object lhs; Object rhs; MyOperator operator; AtomicOperation(Object lhs,MyOperator operator, Object rhs) { this.lhs = lhs; this.rhs = rhs; this.operator = operator; } public Object getLhs() { return lhs; } public void setLhs(Object lhs) { this.lhs = lhs; } public Object getRhs() { return rhs; } public void setRhs(Object rhs) { this.rhs = rhs; } public MyOperator getOperator() { return operator; } public void setOperator(MyOperator operator) { this.operator = operator; } @Override public String toString() { return "(" + lhs.toString() + " " + operator.toString() + " " + rhs.toString() + ")"; } } </code></pre> <p>Then You can Build the necessary AtomicOperation Object using the below code</p> <pre><code>AtomicOperation _r = deriveFromJSON(ConvertJsonToObject.getFromJSON(json,AtomicOperation.class)); </code></pre> <p>Below is the complete ConvertJsonToObject class</p> <pre><code>public class ConvertJsonToObject { private static Gson gson = new GsonBuilder().create(); public static final &lt;T&gt; T getFromJSON(String json, Class&lt;T&gt; clazz) { return gson.fromJson(json, clazz); } public static final &lt;T&gt; String toJSON(T clazz) { return gson.toJson(clazz); } } </code></pre>
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    1. POCreate and read tree data structure from json string dynamically
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    1. COwhere and how to get final outcome. _r gives a hash code!
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    2. COhey try now...i have written proper toString() method for AtomicOperation
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    3. COalso modify toString method of EQUAL_TO in the enum MyOperator
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