GuidedDecisionTableEditorGraphDeleteHelper.java

/*
 * Copyright 2016 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.Set;
import javax.enterprise.context.ApplicationScoped;
import javax.inject.Inject;
import javax.inject.Named;

import org.drools.workbench.screens.guided.dtable.model.GuidedDecisionTableEditorGraphModel;
import org.drools.workbench.screens.guided.dtable.service.GuidedDecisionTableGraphEditorService;
import org.drools.workbench.screens.guided.dtable.type.GuidedDTableGraphResourceTypeDefinition;
import org.drools.workbench.screens.guided.dtable.type.GuidedDTableResourceTypeDefinition;
import org.guvnor.common.services.backend.file.FileExtensionFilter;
import org.guvnor.common.services.backend.util.CommentedOptionFactory;
import org.uberfire.backend.server.util.Paths;
import org.uberfire.backend.vfs.Path;
import org.uberfire.ext.editor.commons.backend.service.helper.DeleteHelper;
import org.uberfire.io.IOService;
import org.uberfire.java.nio.file.Files;

/**
 * DeleteHelper for Guided Decision Tables referenced in Guided Decision Table Graphs
 */
@ApplicationScoped
public class GuidedDecisionTableEditorGraphDeleteHelper implements DeleteHelper {

    private IOService ioService;
    private GuidedDTableResourceTypeDefinition dtableType;
    private GuidedDTableGraphResourceTypeDefinition dtableGraphType;
    private GuidedDecisionTableGraphEditorService dtableGraphService;
    private CommentedOptionFactory commentedOptionFactory;

    public GuidedDecisionTableEditorGraphDeleteHelper() {
        //CDI proxies
    }

    @Inject
    public GuidedDecisionTableEditorGraphDeleteHelper( final @Named("ioStrategy") IOService ioService,
                                                       final GuidedDTableResourceTypeDefinition dtableType,
                                                       final GuidedDTableGraphResourceTypeDefinition dtableGraphType,
                                                       final GuidedDecisionTableGraphEditorService dtableGraphService,
                                                       final CommentedOptionFactory commentedOptionFactory ) {
        this.ioService = ioService;
        this.dtableType = dtableType;
        this.dtableGraphType = dtableGraphType;
        this.dtableGraphService = dtableGraphService;
        this.commentedOptionFactory = commentedOptionFactory;
    }

    @Override
    public boolean supports( final Path destination ) {
        return ( dtableType.accept( destination ) );
    }

    @Override
    public void postProcess( final Path path ) {
        ioService.newDirectoryStream( getParentFolder( path ),
                                      new FileExtensionFilter( dtableGraphType.getSuffix() ) ).forEach( ( p ) -> updateGraphReferences( path,
                                                                                                                                        Paths.convert( p ) ) );
    }

    org.uberfire.java.nio.file.Path getParentFolder( final Path path ) {
        org.uberfire.java.nio.file.Path nioFolderPath = Paths.convert( path );
        return Files.isDirectory( nioFolderPath ) ? nioFolderPath : nioFolderPath.getParent();
    }

    void updateGraphReferences( final Path path,
                                final Path graphPath ) {
        final GuidedDecisionTableEditorGraphModel dtGraphModel = dtableGraphService.load( graphPath );
        final Set<GuidedDecisionTableEditorGraphModel.GuidedDecisionTableGraphEntry> dtGraphEntries = dtGraphModel.getEntries();
        dtGraphEntries.removeIf( ( e ) -> e.getPathHead().equals( path ) );
        ioService.write( Paths.convert( graphPath ),
                         GuidedDTGraphXMLPersistence.getInstance().marshal( dtGraphModel ),
                         commentedOptionFactory.makeCommentedOption( "File [" + path.toURI() + "] deleted." ) );
    }

}