AddExpressionExecutorDouble.java

/*
 * Copyright (c) 2016, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
 *
 * WSO2 Inc. licenses this file to you 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 org.wso2.siddhi.core.executor.math.add;

import org.wso2.siddhi.core.event.ComplexEvent;
import org.wso2.siddhi.core.executor.ExpressionExecutor;
import org.wso2.siddhi.query.api.definition.Attribute;

/**
 * Executor class for Double Add function. Function execution logic is implemented in execute here.
 */
public class AddExpressionExecutorDouble implements ExpressionExecutor {
    private ExpressionExecutor leftExpressionExecutor;
    private ExpressionExecutor rightExpressionExecutor;


    public AddExpressionExecutorDouble(ExpressionExecutor leftExpressionExecutor,
                                       ExpressionExecutor rightExpressionExecutor) {
        this.leftExpressionExecutor = leftExpressionExecutor;
        this.rightExpressionExecutor = rightExpressionExecutor;
    }

    @Override
    public Object execute(ComplexEvent event) {
        Object leftObject = leftExpressionExecutor.execute(event);
        Object rightObject = rightExpressionExecutor.execute(event);
        if (leftObject == null || rightObject == null) {
            return null;
        }
        return ((Number) leftObject).doubleValue() + ((Number) rightObject).doubleValue();
    }

    public Attribute.Type getReturnType() {
        return Attribute.Type.DOUBLE;
    }

    @Override
    public ExpressionExecutor cloneExecutor(String key) {
        return new AddExpressionExecutorDouble(leftExpressionExecutor.cloneExecutor(key), rightExpressionExecutor
                .cloneExecutor(key));
    }

}