com.google.idea.blaze.base.projectview.ProjectViewEdit.java Source code

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Here is the source code for com.google.idea.blaze.base.projectview.ProjectViewEdit.java

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/*
 * Copyright 2016 The Bazel Authors. All rights reserved.
 *
 * 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 com.google.idea.blaze.base.projectview;

import com.google.common.collect.Lists;
import com.google.idea.blaze.base.model.BlazeProjectData;
import com.google.idea.blaze.base.projectview.parser.ProjectViewParser;
import com.google.idea.blaze.base.scope.Scope;
import com.google.idea.blaze.base.sync.data.BlazeProjectDataManager;
import com.google.idea.blaze.base.util.SaveUtil;
import com.intellij.openapi.diagnostic.Logger;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.ui.Messages;
import java.io.File;
import java.io.IOException;
import java.util.List;
import javax.annotation.Nullable;

/** Represents a modification to one or more project view files. */
public class ProjectViewEdit {

    private static final Logger LOG = Logger.getInstance(ProjectViewEdit.class);
    private final Project project;
    private final List<Modification> modifications;

    ProjectViewEdit(Project project, List<Modification> modifications) {
        this.project = project;
        this.modifications = modifications;
    }

    private static class Modification {
        ProjectView oldProjectView;
        ProjectView newProjectView;
        File projectViewFile;
    }

    /** Creates a new edit that modifies the local project view only. */
    @Nullable
    public static ProjectViewEdit editLocalProjectView(Project project, ProjectViewEditor editor) {
        List<Modification> modifications = Lists.newArrayList();
        BlazeProjectData projectData = BlazeProjectDataManager.getInstance(project).getBlazeProjectData();
        if (projectData == null) {
            return null;
        }
        ProjectViewSet oldProjectViewSet = Scope.root((context) -> {
            SaveUtil.saveAllFiles();
            return ProjectViewManager.getInstance(project).reloadProjectView(context,
                    projectData.workspacePathResolver);
        });
        if (oldProjectViewSet == null) {
            return null;
        }

        ProjectViewSet.ProjectViewFile projectViewFile = oldProjectViewSet.getTopLevelProjectViewFile();
        if (projectViewFile == null) {
            return null;
        }

        ProjectView.Builder builder = ProjectView.builder(projectViewFile.projectView);
        if (editor.editProjectView(builder)) {
            Modification modification = new Modification();
            modification.newProjectView = builder.build();
            modification.oldProjectView = projectViewFile.projectView;
            modification.projectViewFile = projectViewFile.projectViewFile;
            modifications.add(modification);
        }
        return new ProjectViewEdit(project, modifications);
    }

    public void apply() {
        apply(true);
    }

    public void undo() {
        apply(false);
    }

    private void apply(boolean isApply) {
        SaveUtil.saveAllFiles();
        for (Modification modification : modifications) {
            ProjectView projectView = isApply ? modification.newProjectView : modification.oldProjectView;
            String projectViewText = ProjectViewParser.projectViewToString(projectView);
            try {
                ProjectViewStorageManager.getInstance().writeProjectView(projectViewText,
                        modification.projectViewFile);
            } catch (IOException e) {
                LOG.error(e);
                Messages.showErrorDialog(project,
                        "Could not write updated project view. Is the file write protected?", "Edit Failed");
            }
        }
    }

    public boolean hasModifications() {
        return !modifications.isEmpty();
    }

    /** Interface for an edit to the project view */
    public interface ProjectViewEditor {
        boolean editProjectView(ProjectView.Builder builder);
    }
}