GuidedDecisionTableModelVisitor.java

/*
 * Copyright 2012 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.workbench.screens.guided.dtable.backend.server;

import java.util.HashSet;
import java.util.List;
import java.util.Set;

import org.drools.workbench.models.datamodel.imports.Import;
import org.drools.workbench.models.datamodel.imports.Imports;
import org.drools.workbench.models.datamodel.rule.IAction;
import org.drools.workbench.models.datamodel.rule.IPattern;
import org.drools.workbench.models.datamodel.rule.RuleModel;
import org.drools.workbench.models.guided.dtable.shared.model.ActionCol52;
import org.drools.workbench.models.guided.dtable.shared.model.ActionInsertFactCol52;
import org.drools.workbench.models.guided.dtable.shared.model.BRLActionColumn;
import org.drools.workbench.models.guided.dtable.shared.model.BRLConditionColumn;
import org.drools.workbench.models.guided.dtable.shared.model.CompositeColumn;
import org.drools.workbench.models.guided.dtable.shared.model.GuidedDecisionTable52;
import org.drools.workbench.models.guided.dtable.shared.model.Pattern52;
import org.drools.workbench.screens.guided.rule.backend.server.GuidedRuleModelVisitor;
import org.uberfire.commons.validation.PortablePreconditions;

/**
 * A RuleModel Visitor to identify fully qualified class names used by the RuleModel
 */
public class GuidedDecisionTableModelVisitor {

    private final GuidedDecisionTable52 model;
    private final String packageName;
    private final Imports imports;

    public GuidedDecisionTableModelVisitor( final GuidedDecisionTable52 model ) {
        this.model = PortablePreconditions.checkNotNull( "model",
                                                         model );
        this.packageName = model.getPackageName();
        this.imports = model.getImports();
    }

    public Set<String> getConsumedModelClasses() {
        final Set<String> factTypes = new HashSet<String>();

        //Extract Fact Types from model
        for ( CompositeColumn<?> cc : model.getConditions() ) {

            if ( cc instanceof BRLConditionColumn ) {
                final List<IPattern> definition = ( (BRLConditionColumn) cc ).getDefinition();
                factTypes.addAll( getConditionFactTypesFromRuleModel( definition ) );

            } else if ( cc instanceof Pattern52 ) {
                factTypes.add( ( (Pattern52) cc ).getFactType() );
            }
        }
        for ( ActionCol52 c : model.getActionCols() ) {

            if ( c instanceof BRLActionColumn ) {
                final List<IAction> definition = ( (BRLActionColumn) c ).getDefinition();
                factTypes.addAll( getActionFactTypesFromRuleModel( definition ) );

            } else if ( c instanceof ActionInsertFactCol52 ) {
                factTypes.add( ( (ActionInsertFactCol52) c ).getFactType() );
            }
        }

        //Convert Fact Types into Fully Qualified Class Names
        final Set<String> fullyQualifiedClassNames = new HashSet<String>();
        for ( String factType : factTypes ) {
            fullyQualifiedClassNames.add( convertToFullyQualifiedClassName( factType ) );
        }

        return fullyQualifiedClassNames;
    }

    //Get the fully qualified class name of the fact type
    private String convertToFullyQualifiedClassName( final String factType ) {
        if ( factType.contains( "." ) ) {
            return factType;
        }
        String fullyQualifiedClassName = null;
        for ( Import imp : imports.getImports() ) {
            if ( imp.getType().endsWith( factType ) ) {
                fullyQualifiedClassName = imp.getType();
                break;
            }
        }
        if ( fullyQualifiedClassName == null ) {
            fullyQualifiedClassName = packageName + "." + factType;
        }
        return fullyQualifiedClassName;
    }

    private Set<String> getConditionFactTypesFromRuleModel( final List<IPattern> definition ) {
        final RuleModel rm = new RuleModel();
        rm.setPackageName( model.getPackageName() );
        rm.setImports( model.getImports() );
        for ( IPattern p : definition ) {
            rm.addLhsItem( p );
        }
        final GuidedRuleModelVisitor visitor = new GuidedRuleModelVisitor( rm );
        return visitor.getConsumedModelClasses();
    }

    private Set<String> getActionFactTypesFromRuleModel( final List<IAction> definition ) {
        final RuleModel rm = new RuleModel();
        rm.setPackageName( model.getPackageName() );
        rm.setImports( model.getImports() );
        for ( IAction a : definition ) {
            rm.addRhsItem( a );
        }
        final GuidedRuleModelVisitor visitor = new GuidedRuleModelVisitor( rm );
        return visitor.getConsumedModelClasses();
    }

}