com.espertech.esper.epl.enummethod.dot.ExprDotForgeUnpackCollEventBean Maven / Gradle / Ivy

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Complex event processing and event series analysis component
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/*
 ***************************************************************************************
 *  Copyright (C) 2006 EsperTech, Inc. All rights reserved.                            *
 *  http://www.espertech.com/esper                                                     *
 *  http://www.espertech.com                                                           *
 *  ---------------------------------------------------------------------------------- *
 *  The software in this package is published under the terms of the GPL license       *
 *  a copy of which has been included with this distribution in the license.txt file.  *
 ***************************************************************************************
 */
package com.espertech.esper.epl.enummethod.dot;

import com.espertech.esper.client.EventBean;
import com.espertech.esper.client.EventType;
import com.espertech.esper.codegen.base.CodegenClassScope;
import com.espertech.esper.codegen.base.CodegenMethodScope;
import com.espertech.esper.codegen.model.expression.CodegenExpression;
import com.espertech.esper.collection.EventUnderlyingCollection;
import com.espertech.esper.epl.expression.codegen.ExprForgeCodegenSymbol;
import com.espertech.esper.codegen.base.CodegenMethodNode;
import com.espertech.esper.epl.expression.core.ExprEvaluatorContext;
import com.espertech.esper.epl.expression.dot.ExprDotEval;
import com.espertech.esper.epl.expression.dot.ExprDotEvalVisitor;
import com.espertech.esper.epl.expression.dot.ExprDotForge;
import com.espertech.esper.epl.rettype.EPType;
import com.espertech.esper.epl.rettype.EPTypeHelper;

import java.util.Collection;

import static com.espertech.esper.codegen.model.expression.CodegenExpressionBuilder.*;

public class ExprDotForgeUnpackCollEventBean implements ExprDotForge, ExprDotEval {

    private final EPType typeInfo;

    public ExprDotForgeUnpackCollEventBean(EventType type) {
        typeInfo = EPTypeHelper.collectionOfSingleValue(type.getUnderlyingType());
    }

    public Object evaluate(Object target, EventBean[] eventsPerStream, boolean isNewData, ExprEvaluatorContext exprEvaluatorContext) {
        if (target == null) {
            return null;
        }
        Collection it = (Collection) target;
        return new EventUnderlyingCollection(it);
    }

    public CodegenExpression codegen(CodegenExpression inner, Class innerType, CodegenMethodScope codegenMethodScope, ExprForgeCodegenSymbol exprSymbol, CodegenClassScope codegenClassScope) {
        CodegenMethodNode methodNode = codegenMethodScope.makeChild(Collection.class, ExprDotForgeUnpackCollEventBean.class, codegenClassScope).addParam(Collection.class, "target");

        methodNode.getBlock()
                .ifRefNullReturnNull("target")
                .methodReturn(newInstance(EventUnderlyingCollection.class, ref("target")));
        return localMethod(methodNode, inner);
    }

    public EPType getTypeInfo() {
        return typeInfo;
    }

    public void visit(ExprDotEvalVisitor visitor) {
        visitor.visitUnderlyingEventColl();
    }

    public ExprDotEval getDotEvaluator() {
        return this;
    }

    public ExprDotForge getDotForge() {
        return this;
    }
}