com.espertech.esper.avro.getter.AvroEventBeanGetterNestedDynamicPoly 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.avro.getter;

import com.espertech.esper.avro.core.AvroEventPropertyGetter;
import com.espertech.esper.client.EventBean;
import com.espertech.esper.client.PropertyAccessException;
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.codegen.base.CodegenMethodNode;
import com.espertech.esper.event.EventPropertyGetterSPI;
import org.apache.avro.Schema;
import org.apache.avro.generic.GenericData;

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

public class AvroEventBeanGetterNestedDynamicPoly implements EventPropertyGetterSPI {

    private final String fieldTop;
    private final AvroEventPropertyGetter getter;

    public AvroEventBeanGetterNestedDynamicPoly(String fieldTop, AvroEventPropertyGetter getter) {
        this.fieldTop = fieldTop;
        this.getter = getter;
    }

    public Object get(EventBean eventBean) throws PropertyAccessException {
        return get((GenericData.Record) eventBean.getUnderlying());
    }

    public boolean isExistsProperty(EventBean eventBean) {
        return isExistsProperty((GenericData.Record) eventBean.getUnderlying());
    }

    private Object get(GenericData.Record record) throws PropertyAccessException {
        GenericData.Record inner = (GenericData.Record) record.get(fieldTop);
        return inner == null ? null : getter.getAvroFieldValue(inner);
    }

    private CodegenMethodNode getCodegen(CodegenMethodScope codegenMethodScope, CodegenClassScope codegenClassScope) {
        return codegenMethodScope.makeChild(Object.class, this.getClass(), codegenClassScope).addParam(GenericData.Record.class, "record").getBlock()
                .declareVar(GenericData.Record.class, "inner", cast(GenericData.Record.class, exprDotMethod(ref("record"), "get", constant(fieldTop))))
                .methodReturn(conditional(equalsNull(ref("inner")), constantNull(), getter.underlyingGetCodegen(ref("inner"), codegenMethodScope, codegenClassScope)));
    }

    private boolean isExistsProperty(GenericData.Record record) {
        Schema.Field field = record.getSchema().getField(fieldTop);
        if (field == null) {
            return false;
        }
        Object inner = record.get(fieldTop);
        if (!(inner instanceof GenericData.Record)) {
            return false;
        }
        return getter.isExistsPropertyAvro((GenericData.Record) inner);
    }

    private CodegenMethodNode isExistsPropertyCodegen(CodegenMethodScope codegenMethodScope, CodegenClassScope codegenClassScope) {
        return codegenMethodScope.makeChild(boolean.class, this.getClass(), codegenClassScope).addParam(GenericData.Record.class, "record").getBlock()
                .declareVar(Schema.Field.class, "field", exprDotMethodChain(ref("record")).add("getSchema").add("getField", constant(fieldTop)))
                .ifRefNullReturnFalse("field")
                .declareVar(Object.class, "inner", exprDotMethod(ref("record"), "get", constant(fieldTop)))
                .ifRefNotTypeReturnConst("inner", GenericData.Record.class, false)
                .methodReturn(getter.underlyingExistsCodegen(cast(GenericData.Record.class, ref("inner")), codegenMethodScope, codegenClassScope));
    }

    public Object getFragment(EventBean eventBean) throws PropertyAccessException {
        return null;
    }

    public CodegenExpression eventBeanGetCodegen(CodegenExpression beanExpression, CodegenMethodScope codegenMethodScope, CodegenClassScope codegenClassScope) {
        return underlyingGetCodegen(castUnderlying(GenericData.Record.class, beanExpression), codegenMethodScope, codegenClassScope);
    }

    public CodegenExpression eventBeanExistsCodegen(CodegenExpression beanExpression, CodegenMethodScope codegenMethodScope, CodegenClassScope codegenClassScope) {
        return underlyingExistsCodegen(castUnderlying(GenericData.Record.class, beanExpression), codegenMethodScope, codegenClassScope);
    }

    public CodegenExpression eventBeanFragmentCodegen(CodegenExpression beanExpression, CodegenMethodScope codegenMethodScope, CodegenClassScope codegenClassScope) {
        return constantNull();
    }

    public CodegenExpression underlyingGetCodegen(CodegenExpression underlyingExpression, CodegenMethodScope codegenMethodScope, CodegenClassScope codegenClassScope) {
        return localMethod(getCodegen(codegenMethodScope, codegenClassScope), underlyingExpression);
    }

    public CodegenExpression underlyingExistsCodegen(CodegenExpression underlyingExpression, CodegenMethodScope codegenMethodScope, CodegenClassScope codegenClassScope) {
        return localMethod(isExistsPropertyCodegen(codegenMethodScope, codegenClassScope), underlyingExpression);
    }

    public CodegenExpression underlyingFragmentCodegen(CodegenExpression underlyingExpression, CodegenMethodScope codegenMethodScope, CodegenClassScope codegenClassScope) {
        return constantNull();
    }
}