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tessl/maven-org-codehaus-groovy--groovy-nio

NIO extensions for Apache Groovy providing enhanced file system operations and path handling

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Groovy NIO Extensions

Groovy NIO Extensions provides enhanced file system operations and path handling capabilities for Apache Groovy. This package extends Groovy's existing I/O functionality with modern Java NIO.2 features, enabling more efficient file system access, path manipulation, and stream operations with Groovy's characteristic closure-based programming model.

Package Information

  • Package Name: groovy-nio
  • Package Type: maven
  • Language: Java (Groovy)
  • Installation: 
    implementation 'org.codehaus.groovy:groovy-nio:3.0.25'
  • Maven: 
    <dependency>
  <groupId>org.codehaus.groovy</groupId>
  <artifactId>groovy-nio</artifactId>
  <version>3.0.25</version>
</dependency>

Core Imports

import java.nio.file.Path
import java.nio.file.Paths
// Extension methods are automatically available on Path objects

Basic Usage

import java.nio.file.Path
import java.nio.file.Paths

// Create a path
Path myFile = Paths.get("example.txt")

// Write text to file
myFile.text = "Hello, World!"

// Read text from file
String content = myFile.getText()

// Append text
myFile << " Additional content"

// Process lines with closure
myFile.eachLine { line ->
    println line
}

// Directory traversal
Path myDir = Paths.get("my-directory")
myDir.eachFile { file ->
    println "Found: ${file.fileName}"
}

Architecture

Groovy NIO Extensions is built around several key components:

  • Extension Methods: The NioExtensions class provides static extension methods that are automatically applied to java.nio.file.Path objects
  • Closure Integration: Extensive use of Groovy closures for resource management, iteration, and filtering operations
  • Writable Interface: Integration with Groovy's Writable interface for streaming operations
  • Resource Management: Automatic resource management using try-with-resources patterns
  • Charset Support: Comprehensive character encoding support with optional BOM handling

Capabilities

File Reading and Writing

Core file I/O operations for reading and writing text, binary data, and objects to files. Provides both simple text operations and advanced charset handling.

// Text operations
String getText(Path self);
String getText(Path self, String charset);
void write(Path self, String text);
void write(Path self, String text, String charset);
void setText(Path self, String text);

// Binary operations  
byte[] getBytes(Path self);
byte[] readBytes(Path self);
void setBytes(Path self, byte[] bytes);

// Line operations
List<String> readLines(Path self);
List<String> readLines(Path self, String charset);

File I/O Operations

File Appending Operations

Append data to existing files with support for text, binary data, and various input sources including streams and closures.

// Text appending
void append(Path self, Object text);
void append(Path self, Object text, String charset);
Path leftShift(Path self, Object text);

// Binary appending
void append(Path self, byte[] bytes);
void append(Path self, InputStream stream);
Path leftShift(Path self, byte[] bytes);

File Appending

Line Processing

Process files line-by-line with closures, including splitting, filtering, and transformation operations with charset support.

<T> T eachLine(Path self, Closure<T> closure);
<T> T eachLine(Path self, String charset, Closure<T> closure);
<T> T splitEachLine(Path self, String regex, Closure<T> closure);
Writable filterLine(Path self, Closure closure);

Line Processing

Directory Traversal

Traverse directory structures with filtering, sorting, and recursion options. Support for file type filtering and advanced traversal patterns.

void eachFile(Path self, Closure closure);
void eachFile(Path self, FileType fileType, Closure closure);
void eachFileRecurse(Path self, Closure closure);
void traverse(Path self, Map<String, Object> options, Closure closure);

Directory Operations

Stream Management

Create and manage various stream types with automatic resource management using closures for safe operation.

BufferedReader newReader(Path self);
BufferedWriter newWriter(Path self);
<T> T withReader(Path self, Closure<T> closure);
<T> T withWriter(Path self, Closure<T> closure);
BufferedInputStream newInputStream(Path self);
BufferedOutputStream newOutputStream(Path self);

Stream Operations

Object Serialization

Handle Java object serialization and deserialization with support for custom class loaders and closure-based processing.

ObjectInputStream newObjectInputStream(Path self);
ObjectOutputStream newObjectOutputStream(Path self);
<T> T withObjectInputStream(Path self, Closure<T> closure);
void eachObject(Path self, Closure closure);

Object Serialization

Writable Conversion

Convert Path objects to Groovy's Writable interface for streaming and output operations.

Path asWritable(Path self);
Path asWritable(Path self, String encoding);
<T> T asType(Path path, Class<T> c);

Stream Operations

Types

// Core Groovy types used throughout the API
interface Closure<T> {
    T call(Object... args);
}

// File type enumeration for filtering
enum FileType {
    FILES,      // Regular files only
    DIRECTORIES, // Directories only  
    ANY         // Both files and directories
}

// Writable interface for streaming
interface Writable {
    Writer writeTo(Writer out);
}

// WritablePath - Path wrapper implementing Writable
class WritablePath implements Path, Writable {
    WritablePath(Path delegate);
    WritablePath(Path delegate, String encoding);
    Writer writeTo(Writer out);
}

Install with Tessl CLI

npx tessl i tessl/maven-org-codehaus-groovy--groovy-nio
Workspace
tessl
Visibility
Public
Created
Last updated
Describes
mavenpkg:maven/org.codehaus.groovy/groovy-nio@3.0.x