org.drools.compiler.builder.impl.PackageDescrBuilder Maven / Gradle / Ivy

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/*
 * Copyright 2022 Red Hat, Inc. and/or its affiliates.
 *
 * 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 org.drools.compiler.builder.impl;

import org.drools.compiler.builder.impl.resources.DecisionTableResourceHandler;
import org.drools.compiler.builder.impl.resources.DrlResourceHandler;
import org.drools.compiler.builder.impl.resources.DslrResourceHandler;
import org.drools.compiler.builder.impl.resources.ResourceHandler;
import org.drools.compiler.builder.impl.resources.TemplateResourceHandler;
import org.drools.compiler.lang.descr.CompositePackageDescr;
import org.drools.drl.ast.descr.PackageDescr;
import org.drools.drl.parser.lang.dsl.DefaultExpander;
import org.kie.api.builder.ReleaseId;
import org.kie.api.io.Resource;
import org.kie.api.io.ResourceType;
import org.kie.internal.builder.KnowledgeBuilderResult;

import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.function.Supplier;

import static java.util.Arrays.asList;

public class PackageDescrBuilder {
    private final BuildResultCollector buildResultCollector;
    private final List mappers;
    private final List orderedResourceTypes;
    private RuntimeException buildException;

    public PackageDescrBuilder(KnowledgeBuilderConfigurationImpl configuration, ReleaseId releaseId, Supplier dslExpander) {
        this.buildResultCollector = new BuildResultCollectorImpl();

        this.mappers = asList(
                new DrlResourceHandler(configuration),
                new TemplateResourceHandler(configuration, releaseId, dslExpander),
                new DslrResourceHandler(configuration, dslExpander) ,
                new DecisionTableResourceHandler(configuration, releaseId));

        this.orderedResourceTypes = asList(
                ResourceType.DRL,
                ResourceType.GDRL,
                ResourceType.RDRL,
                ResourceType.DESCR,
                ResourceType.DSLR,
                ResourceType.RDSLR,
                ResourceType.DTABLE,
                ResourceType.TDRL,
                ResourceType.TEMPLATE);

    }

    public Collection build(Map> resourcesByType) {
        Map packages = new HashMap<>();

        for (ResourceType type : this.orderedResourceTypes) {
            ResourceHandler mapper = handlerForType(type);
            buildResource(packages, type, mapper, resourcesByType);
        }

        return packages.values();
    }

    public Collection getResults() {
        return buildResultCollector.getAllResults();
    }

    public RuntimeException getBuildException() {
        return buildException;
    }

    private ResourceHandler handlerForType(ResourceType type) {
        for (ResourceHandler mapper : mappers) {
            if (mapper.handles(type)) {
                return mapper;
            }
        }
        throw new IllegalArgumentException("No registered mapper for type " + type);
    }

    private void buildResource(
            Map packages,
            ResourceType resourceType, ResourceHandler mapper,
            Map> resourcesByType) {
        List resourceDescrs = resourcesByType.remove(resourceType);
        if (resourceDescrs != null) {
            for (CompositeKnowledgeBuilderImpl.ResourceDescr resourceDescr : resourceDescrs) {
                try {
                    PackageDescr packageDescr = mapper.process(resourceDescr.resource, resourceDescr.configuration);
                    mapper.getResults().forEach(buildResultCollector::addBuilderResult);
                    registerPackageDescr(resourceDescr, packages, resourceDescr.resource, packageDescr);
                } catch (RuntimeException e) {
                    if (buildException == null) {
                        buildException = e;
                    }
                } catch (Exception e) {
                    if (buildException == null) {
                        buildException = new RuntimeException( e );
                    }
                }
            }
        }
    }


    private void registerPackageDescr(
            CompositeKnowledgeBuilderImpl.ResourceDescr resourceDescr, Map packages, Resource resource, PackageDescr packageDescr) {
        if (packageDescr == null) { return; }
        CompositePackageDescr compositePackageDescr = packages.get(packageDescr.getNamespace());
        if (compositePackageDescr == null) {
            compositePackageDescr = makeCompositePackageDescr(resource, packageDescr);
            packages.put(packageDescr.getNamespace(), compositePackageDescr);
        } else {
            compositePackageDescr.addPackageDescr(resource, packageDescr);
        }
        compositePackageDescr.addFilter( resourceDescr.getFilter() );
    }

    private CompositePackageDescr makeCompositePackageDescr(Resource resource, PackageDescr packageDescr) {
        CompositePackageDescr compositePackageDescr;
        compositePackageDescr = packageDescr instanceof CompositePackageDescr ?
                ( (CompositePackageDescr) packageDescr) :
                new CompositePackageDescr(resource, packageDescr);
        return compositePackageDescr;
    }
}