jQuery Common - Object Structures - FileSystemError

const objectProvider = new DevExpress.fileManagement.ObjectFileSystemProvider({ data: fileSystem });
const keepExtensionsProvider = new DevExpress.fileManagement.CustomFileSystemProvider({
    getItems: function(item) {
        return objectProvider.getItems(item);
    },
    renameItem: function(item, newName) {
        return new Promise((resolve, reject) => {
            if(item.getFileExtension() !== getExtension(newName)) {
                // 1 - reject
                reject(new DevExpress.fileManagement.FileSystemError(5, item, "You cannot change the file extension."));
                // 2 - throw
                // throw new DevExpress.fileManagement.FileSystemError(5, item, "You cannot change the file extension.");
            } else {
                resolve(objectProvider.renameItem(item, newName));
            }
        });
    }
});
const getExtension = function(path) {
    const index = path.lastIndexOf(".");
    return index !== -1 ? path.substr(index) : "";
}

$("#file-manager").dxFileManager({ 
    fileSystemProvider: keepExtensionsProvider,
    permissions: { rename: true }
});

var fileSystem = [
    {
        name: "Documents",
        isDirectory: true,
        items: [
            {
                name: "Projects",
                isDirectory: true,
                items: [
                    {
                        name: "About.rtf",
                        isDirectory: false,
                        size: 1024
                    },
                    {
                        name: "Passwords.rtf",
                        isDirectory: false,
                        size: 2048
                    }
                ]
            },
            {
                name: "About.xml",
                isDirectory: false,
                size: 1024
            },
            {
                name: "Managers.rtf",
                isDirectory: false,
                size: 2048
            },
            {
                name: "ToDo.txt",
                isDirectory: false,
                size: 3072
            }
        ],
    },
    {
        name: "Images",
        isDirectory: true,
        items: [
            {
                name: "logo.png",
                isDirectory: false,
                size: 20480
            },
            {
                name: "banner.gif",
                isDirectory: false,
                size: 10240
            }
        ]
    },
    {
        name: "System",
        isDirectory: true,
        items: [
            {
                name: "Employees.txt",
                isDirectory: false,
                size: 3072
            },
            {
                name: "PasswordList.txt",
                isDirectory: false,
                size: 5120
            }
        ]
    },
    {
        name: "Description.rtf",
        isDirectory: false,
        size: 1024
    },
    {
        name: "Description.txt",
        isDirectory: false,
        size: 2048
    }
];

<dx-file-manager id="fileManager">
    [fileSystemProvider]="keepExtensionsProvider">
    <dxo-permissions rename="true">
    </dxo-permissions>
    <!-- ... -->
</dx-file-manager>

import { Component } from '@angular/core';
import ObjectFileSystemProvider from 'devextreme/file_management/object_provider';
import CustomFileSystemProvider from 'devextreme/file_management/custom_provider';
import FileSystemError from 'devextreme/file_management/error';
import { Service, FileItem } from "./app.service";

@Component({
    selector: 'app-root',
    templateUrl: './app.component.html',
    styleUrls: ['./app.component.css'],
    providers: [Service]
})

export class AppComponent {
    fileItems: FileItem[];
    objectProvider: ObjectFileSystemProvider;
    keepExtensionsProvider: CustomFileSystemProvider;

    constructor(service: Service) {
        this.fileItems = service.getFileItems();
        this.objectProvider = new ObjectFileSystemProvider({
            data: this.fileItems
        });
        this.keepExtensionsProvider = new CustomFileSystemProvider({
            getItems: (parentDir) => this.getItems(parentDir),
            renameItem: (item, newName) => this.renameItem(item, newName)
        });
    }      
    getItems(item) {
        return this.objectProvider.getItems(item);
    }
    renameItem(item, newName) {
        return new Promise<any>((resolve, reject) => {
        if(item.getFileExtension() !== this.getExtension(newName)) {
            // 1 - reject
            reject(new FileSystemError(5, item, "You cannot change the file extension."));
            // 2 - throw
            // throw new FileSystemError(5, item, "You cannot change the file extension.");
        } else {
            resolve(this.objectProvider.renameItem(item, newName));
        }
        });
    }
    getExtension(path) {
        const index = path.lastIndexOf(".");
        return index !== -1 ? path.substr(index) : "";
    }
}

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { AppComponent } from './app.component';
import { DxFileManagerModule } from "devextreme-angular";

@NgModule({
    imports: [
        // ...
        DxFileManagerModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent]
})
export class AppModule { }

import { Injectable } from '@angular/core';

export class FileItem {
    name: string;
    isDirectory: boolean;
    size?: number;
    items?: FileItem[];
}

let fileItems: FileItem[] = [{
    'name': 'Documents',
    'isDirectory': true,
    'items': [{
        'name': 'Projects',
        'isDirectory': true,
        'items': [{
            'name': 'About.rtf',
            'isDirectory': false,
            'size': 1024
        }, {
            'name': 'Passwords.rtf',
            'isDirectory': false,
            'size': 2048
        }]
    }, {
        'name': 'About.xml',
        'isDirectory': false,
        'size': 1024
    }, {
        'name': 'Managers.rtf',
        'isDirectory': false,
        'size': 2048
    }, {
        'name': 'ToDo.txt',
        'isDirectory': false,
        'size': 3072
    }],
}, {
    'name': 'Images',
    'isDirectory': true,
    'items': [{
        'name': 'logo.png',
        'isDirectory': false,
        'size': 20480
    }, {
        'name': 'banner.gif',
        'isDirectory': false,
        'size': 10240
    }]
}, {
    'name': 'System',
    'isDirectory': true,
    'items': [{
        'name': 'Employees.txt',
        'isDirectory': false,
        'size': 3072
    }, {
        'name': 'PasswordList.txt',
        'isDirectory': false,
        'size': 5120
    }]
}, {
    'name': 'Description.rtf',
    'isDirectory': false,
    'size': 1024
}, {
    'name': 'Description.txt',
    'isDirectory': false,
    'size': 2048
}];

@Injectable()
export class Service {
    getFileItems(): FileItem[] {
        return fileItems;
    }
}

<template>
    <DxFileManager :file-system-provider="keepExtensionsProvider">
        <DxPermissions :rename="true" />
    </DxFileManager>
</template>

<script>
    import ObjectFileSystemProvider from "devextreme/file_management/object_provider";
    import CustomFileSystemProvider from "devextreme/file_management/custom_provider";
    import FileSystemError from "devextreme/file_management/error";
    import { DxFileManager, DxPermissions } from "devextreme-vue/file-manager";
    import { fileItems } from "./data.js";
    export default {
        components: {
            DxFileManager,
            DxPermissions,
        },
        data() {
            return {
                objectProvider: new ObjectFileSystemProvider({ data: fileItems }),
                keepExtensionsProvider: new CustomFileSystemProvider({
                    getItems: (parentDir) => this.getItems(parentDir),
                    renameItem: (item, newName) => this.renameItem(item, newName),
                }),
                };
            },
            methods: {
                getItems(parentDir) {
                    return this.objectProvider.getItems(parentDir);
                },
                renameItem(item, newName) {
                    return new Promise((resolve, reject) => {
                        if(item.getFileExtension() !== this.getExtension(newName)) {
                            // 1 - reject
                            reject(new FileSystemError(5, item, "You cannot change the file extension."));
                            // 2 - throw
                            // throw new FileSystemError(5, item, "You cannot change the file extension.");
                        } else {
                            resolve(this.objectProvider.renameItem(item, newName));
                        }
                    });
                },
            },
        },
    };
</script>

export const fileItems = [{
  'name': 'Documents',
  'isDirectory': true,
  'items': [{
    'name': 'Projects',
    'isDirectory': true,
    'items': [{
      'name': 'About.rtf',
      'isDirectory': false,
      'size': 1024
    }, {
      'name': 'Passwords.rtf',
      'isDirectory': false,
      'size': 2048
    }]
  }, {
    'name': 'About.xml',
    'isDirectory': false,
    'size': 1024
  }, {
    'name': 'Managers.rtf',
    'isDirectory': false,
    'size': 2048
  }, {
    'name': 'ToDo.txt',
    'isDirectory': false,
    'size': 3072
  }],
}, {
  'name': 'Images',
  'isDirectory': true,
  'items': [{
    'name': 'logo.png',
    'isDirectory': false,
    'size': 20480
  }, {
    'name': 'banner.gif',
    'isDirectory': false,
    'size': 10240
  }]
}, {
  'name': 'System',
  'isDirectory': true,
  'items': [{
    'name': 'Employees.txt',
    'isDirectory': false,
    'size': 3072
  }, {
    'name': 'PasswordList.txt',
    'isDirectory': false,
    'size': 5120
  }]
}, {
  'name': 'Description.rtf',
  'isDirectory': false,
  'size': 1024
}, {
  'name': 'Description.txt',
  'isDirectory': false,
  'size': 2048
}];

import React from "react";
import ObjectFileSystemProvider from "devextreme/file_management/object_provider";
import CustomFileSystemProvider from "devextreme/file_management/custom_provider";
import FileSystemError from "devextreme/file_management/error";
import FileManager, { Permissions } from "devextreme-react/file-manager";
import { fileItems } from "./data.js";

import 'devextreme/dist/css/dx.light.css';

const objectProvider = new ObjectFileSystemProvider({
    data: fileItems
});

const keepExtensionsProvider = new CustomFileSystemProvider({
    getItems: (parentDir) => getItems(parentDir),
    renameItem: (item, newName) => renameItem(item, newName),
});

function getItems(parentDir) {
    return objectProvider.getItems(parentDir);
};

function renameItem(item, newName) {
    return new Promise((resolve, reject) => {
    if(item.getFileExtension() !== getExtension(newName)) {
        // 1 - reject
        reject(new FileSystemError(5, item, "You cannot change the file extension."));
        // 2 - throw
        // throw new FileSystemError(5, item, "You cannot change the file extension.");
    } else {
        resolve(objectProvider.renameItem(item, newName));
    }
    });
};

function getExtension(path) {
    const index = path.lastIndexOf(".");
    return index !== -1 ? path.substr(index) : "";
};

const App = () => {
    return (
        <FileManager 
            fileSystemProvider={keepExtensionsProvider}>
            <Permissions rename={true}></Permissions>
        </FileManager>
    );
};

export default App;

export const fileItems = [{
  'name': 'Documents',
  'isDirectory': true,
  'items': [{
    'name': 'Projects',
    'isDirectory': true,
    'items': [{
      'name': 'About.rtf',
      'isDirectory': false,
      'size': 1024
    }, {
      'name': 'Passwords.rtf',
      'isDirectory': false,
      'size': 2048
    }]
  }, {
    'name': 'About.xml',
    'isDirectory': false,
    'size': 1024
  }, {
    'name': 'Managers.rtf',
    'isDirectory': false,
    'size': 2048
  }, {
    'name': 'ToDo.txt',
    'isDirectory': false,
    'size': 3072
  }],
}, {
  'name': 'Images',
  'isDirectory': true,
  'items': [{
    'name': 'logo.png',
    'isDirectory': false,
    'size': 20480
  }, {
    'name': 'banner.gif',
    'isDirectory': false,
    'size': 10240
  }]
}, {
  'name': 'System',
  'isDirectory': true,
  'items': [{
    'name': 'Employees.txt',
    'isDirectory': false,
    'size': 3072
  }, {
    'name': 'PasswordList.txt',
    'isDirectory': false,
    'size': 5120
  }]
}, {
  'name': 'Description.rtf',
  'isDirectory': false,
  'size': 1024
}, {
  'name': 'Description.txt',
  'isDirectory': false,
  'size': 2048
}];

@(Html.DevExtreme().FileManager()
    .FileSystemProvider(provider => provider
        .Custom()
        .GetItems("getItems")
        .RenameItem("renameItem"))
    .Permissions(permissions => permissions.Rename(true))
)
<script src="~/fileSystem.js"></script>
<script>
    const objectProvider = new DevExpress.fileManagement.ObjectFileSystemProvider({ data: fileSystem });

    function getItems(item) {
        return objectProvider.getItems(item);

    }
    function renameItem(item, newName) {
        return new Promise((resolve, reject) => {
            if(item.getFileExtension() !== getExtension(newName)) {
                // 1 - reject
                reject(new DevExpress.fileManagement.FileSystemError(5, item, "You cannot change the file extension."));
                // 2 - throw
                // throw new DevExpress.fileManagement.FileSystemError(5, item, "You cannot change the file extension.");
            } else {
                resolve(objectProvider.renameItem(item, newName));
            }
        });
    }
    function getExtension(path) {
        const index = path.lastIndexOf(".");
        return index !== -1 ? path.substr(index) : "";
    }
</script>

var fileSystem = [
    {
        name: "Documents",
        isDirectory: true,
        category: "Work",
        items: [
            {
                name: "Projects",
                isDirectory: true,
                category: "Work",
                items: [
                    {
                        name: "About.rtf",
                        isDirectory: false,
                        size: 1024
                    },
                    {
                        name: "Passwords.rtf",
                        isDirectory: false,
                        category: "Important",
                        size: 2048
                    }
                ]
            },
            {
                name: "About.xml",
                isDirectory: false,
                size: 1024
            },
            {
                name: "Managers.rtf",
                isDirectory: false,
                size: 2048
            },
            {
                name: "ToDo.txt",
                isDirectory: false,
                size: 3072
            }
        ],
    },
    {
        name: "Images",
        isDirectory: true,
        category: "Home",
        items: [
            {
                name: "logo.png",
                isDirectory: false,
                size: 20480
            },
            {
                name: "banner.gif",
                isDirectory: false,
                size: 10240
            }
        ]
    },
    {
        name: "System",
        isDirectory: true,
        category: "Important",
        items: [
            {
                name: "Employees.txt",
                isDirectory: false,
                category: "Important",
                size: 3072
            },
            {
                name: "PasswordList.txt",
                isDirectory: false,
                category: "Important",
                size: 5120
            }
        ]
    },
    {
        name: "Description.rtf",
        isDirectory: false,
        size: 1024
    },
    {
        name: "Description.txt",
        isDirectory: false,
        size: 2048
    }
];