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Provides seamlessly integrated Java access to graph databases (Neo4J) at different levels of abstraction.

There is a newer version: 4.2.0

/************************************************************************
 * Copyright (c) 2014 IoT-Solutions e.U.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *  http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ************************************************************************/

package iot.jcypher.query.api.predicate;

import iot.jcypher.query.api.APIObject;
import iot.jcypher.query.api.IClause;
import iot.jcypher.query.api.collection.ICollectExpression;
import iot.jcypher.query.api.collection.IPredicateFunction;
import iot.jcypher.query.ast.predicate.Predicate;
import iot.jcypher.query.ast.predicate.PredicateConcatenator;
import iot.jcypher.query.ast.predicate.PredicateExpression;
import iot.jcypher.query.ast.predicate.PredicateConcatenator.ConcatOperator;

public class Concatenator extends APIObject implements ICollectExpression, IPredicateFunction, IClause {

	Concatenator(PredicateExpression pe) {
		super();
		this.astNode = pe;
	}

	/**
	 * JCYPHER
	 * 'and' two boolean expressions or values
	 * 

	 */
	public Concat AND() {
		return concatenate(ConcatOperator.AND);
	}
	
	/**
	 * JCYPHER
	 * 'or' two boolean expressions or values
	 * 

	 */
	public Concat OR() {
		return concatenate(ConcatOperator.OR);
	}
	
	/**
	 * JCYPHER
	 * 'xor' (exclusive or) two boolean expressions or values
	 * 

	 */
	public Concat XOR() {
		return concatenate(ConcatOperator.XOR);
	}
	
	/**
	 * JCYPHER
	 * close a bracket; allows to nest expressions, must have a matching BR_OPEN()
	 * e.g. WHERE... ...BR_OPEN()
	 * 
.valueOf(charlie.property("lastName")).EQUALS("Sheen")
.BR_CLOSE()
	 * 

	 */
	public Concatenator BR_CLOSE() {
		if (((PredicateExpression)this.astNode).getParent() != null) {
			Concatenator ret = new Concatenator(((PredicateExpression)this.astNode).getParent());
			return ret;
		} else
			throw new RuntimeException("No matching open bracket");
	}
	
	private Concat concatenate(ConcatOperator op) {
		Predicate predicate = ((PredicateExpression)this.astNode).getLastPredicate();
		PredicateConcatenator cp = new PredicateConcatenator();
		predicate.setNext(cp);
		cp.setConcatOperator(op);
		Concat concat = new Concat((PredicateExpression)this.astNode);
		return concat;
	}
}