org.drools.rule.builder.dialect.asm.AbstractASMPredicateBuilder Maven / Gradle / Ivy

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package org.drools.rule.builder.dialect.asm;

import org.drools.compiler.AnalysisResult;
import org.drools.compiler.BoundIdentifiers;
import org.drools.lang.descr.PredicateDescr;
import org.drools.rule.Declaration;
import org.drools.rule.PredicateConstraint;
import org.drools.rule.builder.PredicateBuilder;
import org.drools.rule.builder.RuleBuildContext;

import java.util.Map;

import static org.drools.rule.builder.dialect.java.JavaRuleBuilderHelper.createVariableContext;
import static org.drools.rule.builder.dialect.java.JavaRuleBuilderHelper.generateMethodTemplate;
import static org.drools.rule.builder.dialect.java.JavaRuleBuilderHelper.registerInvokerBytecode;

public abstract class AbstractASMPredicateBuilder implements PredicateBuilder {
    public void build(final RuleBuildContext context,
                      final BoundIdentifiers usedIdentifiers,
                      final Declaration[] previousDeclarations,
                      final Declaration[] localDeclarations,
                      final PredicateConstraint predicateConstraint,
                      final PredicateDescr predicateDescr,
                      final AnalysisResult analysis) {

        final String className = "predicate" + context.getNextId();
        predicateDescr.setClassMethodName( className );

        final Map vars = createVariableContext( className,
                                               (String) predicateDescr.getContent(),
                                               context,
                                               previousDeclarations,
                                               localDeclarations,
                                               usedIdentifiers.getGlobals() );

        generateMethodTemplate("predicateMethod", context, vars);

        byte[] bytecode = createPredicateBytecode(context, vars);
        registerInvokerBytecode(context, vars, bytecode, predicateConstraint);
    }

    protected abstract byte[] createPredicateBytecode(RuleBuildContext context, Map vars);
}