DRLTextEditorServiceImpl.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.drltext.backend.server;

import java.util.Arrays;
import java.util.List;
import javax.enterprise.context.ApplicationScoped;
import javax.enterprise.event.Event;
import javax.inject.Inject;
import javax.inject.Named;

import org.drools.workbench.models.commons.backend.packages.PackageNameParser;
import org.drools.workbench.models.commons.backend.packages.PackageNameWriter;
import org.drools.workbench.models.datamodel.oracle.PackageDataModelOracle;
import org.drools.workbench.models.datamodel.packages.HasPackageName;
import org.drools.workbench.models.datamodel.rule.DSLSentence;
import org.drools.workbench.screens.drltext.model.DrlModelContent;
import org.drools.workbench.screens.drltext.service.DRLTextEditorService;
import org.drools.workbench.screens.drltext.type.DRLResourceTypeDefinition;
import org.drools.workbench.screens.drltext.type.DSLRResourceTypeDefinition;
import org.guvnor.common.services.backend.config.SafeSessionInfo;
import org.guvnor.common.services.backend.exceptions.ExceptionUtilities;
import org.guvnor.common.services.backend.util.CommentedOptionFactory;
import org.guvnor.common.services.backend.validation.GenericValidator;
import org.guvnor.common.services.project.model.Package;
import org.guvnor.common.services.shared.metadata.model.Metadata;
import org.guvnor.common.services.shared.metadata.model.Overview;
import org.guvnor.common.services.shared.validation.model.ValidationMessage;
import org.jboss.errai.bus.server.annotations.Service;
import org.kie.workbench.common.services.backend.service.KieService;
import org.kie.workbench.common.services.datamodel.backend.server.DataModelOracleUtilities;
import org.kie.workbench.common.services.datamodel.backend.server.service.DataModelService;
import org.uberfire.backend.server.util.Paths;
import org.uberfire.backend.vfs.Path;
import org.uberfire.ext.editor.commons.service.CopyService;
import org.uberfire.ext.editor.commons.service.DeleteService;
import org.uberfire.ext.editor.commons.service.RenameService;
import org.uberfire.io.IOService;
import org.uberfire.java.nio.file.FileAlreadyExistsException;
import org.uberfire.rpc.SessionInfo;
import org.uberfire.workbench.events.ResourceOpenedEvent;

@Service
@ApplicationScoped
public class DRLTextEditorServiceImpl
        extends KieService<DrlModelContent>
        implements DRLTextEditorService {

    @Inject
    @Named("ioStrategy")
    private IOService ioService;

    @Inject
    private CopyService copyService;

    @Inject
    private DeleteService deleteService;

    @Inject
    private RenameService renameService;

    @Inject
    private Event<ResourceOpenedEvent> resourceOpenedEvent;

    @Inject
    private DataModelService dataModelService;

    @Inject
    private GenericValidator genericValidator;

    @Inject
    private DRLResourceTypeDefinition drlResourceType;

    @Inject
    private DSLRResourceTypeDefinition dslrResourceType;

    @Inject
    private CommentedOptionFactory commentedOptionFactory;
    private SafeSessionInfo safeSessionInfo;

    public DRLTextEditorServiceImpl() {
    }

    @Inject
    public DRLTextEditorServiceImpl( final SessionInfo sessionInfo ) {
        safeSessionInfo = new SafeSessionInfo( sessionInfo );
    }

    @Override
    public Path create( final Path context,
                        final String fileName,
                        final String content,
                        final String comment ) {
        try {
            final String drl = assertPackageName( content,
                                                  context );

            final org.uberfire.java.nio.file.Path nioPath = Paths.convert( context ).resolve( fileName );
            final Path newPath = Paths.convert( nioPath );

            if ( ioService.exists( nioPath ) ) {
                throw new FileAlreadyExistsException( nioPath.toString() );
            }

            ioService.write( nioPath,
                             drl,
                             commentedOptionFactory.makeCommentedOption( comment ) );

            return newPath;

        } catch ( Exception e ) {
            throw ExceptionUtilities.handleException( e );
        }
    }

    @Override
    public String load( final Path path ) {
        try {
            final String content = ioService.readAllString( Paths.convert( path ) );

            return content;

        } catch ( Exception e ) {
            throw ExceptionUtilities.handleException( e );
        }
    }

    @Override
    public DrlModelContent loadContent( final Path path ) {
        return super.loadContent( path );
    }

    @Override
    protected DrlModelContent constructContent( Path path,
                                                Overview overview ) {
        final PackageDataModelOracle oracle = dataModelService.getDataModel( path );
        final String[] fullyQualifiedClassNames = DataModelOracleUtilities.getFactTypes( oracle );
        final List<DSLSentence> dslConditions = oracle.getPackageDslConditionSentences();
        final List<DSLSentence> dslActions = oracle.getPackageDslActionSentences();

        //Signal opening to interested parties
        resourceOpenedEvent.fire( new ResourceOpenedEvent( path,
                                                           safeSessionInfo ) );

        return new DrlModelContent( load( path ),
                                    overview,
                                    Arrays.asList( fullyQualifiedClassNames ),
                                    dslConditions,
                                    dslActions );

    }

    @Override
    public List<String> loadClassFields( final Path path,
                                         final String fullyQualifiedClassName ) {
        try {
            final PackageDataModelOracle oracle = dataModelService.getDataModel( path );
            final String[] fieldNames = DataModelOracleUtilities.getFieldNames( oracle,
                                                                                fullyQualifiedClassName );
            return Arrays.asList( fieldNames );

        } catch ( Exception e ) {
            throw ExceptionUtilities.handleException( e );
        }
    }

    @Override
    public Path save( final Path resource,
                      final String content,
                      final Metadata metadata,
                      final String comment ) {
        try {
            final String drl = assertPackageName( content,
                                                  resource );
            Metadata currentMetadata = metadataService.getMetadata( resource );
            ioService.write( Paths.convert( resource ),
                             drl,
                             metadataService.setUpAttributes( resource,
                                                              metadata ),
                             commentedOptionFactory.makeCommentedOption( comment ) );

            fireMetadataSocialEvents( resource, currentMetadata, metadata );
            return resource;

        } catch ( Exception e ) {
            throw ExceptionUtilities.handleException( e );
        }
    }

    @Override
    public void delete( final Path path,
                        final String comment ) {
        try {
            deleteService.delete( path,
                                  comment );

        } catch ( Exception e ) {
            throw ExceptionUtilities.handleException( e );
        }
    }

    @Override
    public Path rename( final Path path,
                        final String newName,
                        final String comment ) {
        try {
            return renameService.rename( path,
                                         newName,
                                         comment );

        } catch ( Exception e ) {
            throw ExceptionUtilities.handleException( e );
        }
    }

    @Override
    public Path copy( final Path path,
                      final String newName,
                      final String comment ) {
        try {
            return copyService.copy( path,
                                     newName,
                                     comment );

        } catch ( Exception e ) {
            throw ExceptionUtilities.handleException( e );
        }
    }

    @Override
    public Path copy( final Path path,
                      final String newName,
                      final Path targetDirectory,
                      final String comment ) {
        try {
            return copyService.copy( path,
                                     newName,
                                     targetDirectory,
                                     comment );

        } catch ( Exception e ) {
            throw ExceptionUtilities.handleException( e );
        }
    }

    @Override
    public List<ValidationMessage> validate( final Path path,
                                             final String content ) {
        try {
            return genericValidator.validate( path,
                                              content );

        } catch ( Exception e ) {
            throw ExceptionUtilities.handleException( e );
        }
    }

    //Check if the DRL contains a Package declaration, appending one if it does not exist
    @Override
    public String assertPackageName( final String drl,
                                     final Path resource ) {
        try {
            final String existingPackageName = PackageNameParser.parsePackageName( drl );
            if ( !"".equals( existingPackageName ) ) {
                return drl;
            }

            final Package pkg = projectService.resolvePackage( resource );
            final String requiredPackageName = ( pkg == null ? null : pkg.getPackageName() );
            final HasPackageName mockHasPackageName = new HasPackageName() {

                @Override
                public String getPackageName() {
                    return requiredPackageName;
                }

                @Override
                public void setPackageName( final String packageName ) {
                    //Nothing to do here
                }
            };
            final StringBuilder sb = new StringBuilder();
            PackageNameWriter.write( sb,
                                     mockHasPackageName );
            sb.append( drl );
            return sb.toString();

        } catch ( Exception e ) {
            throw ExceptionUtilities.handleException( e );
        }
    }

}