Remove nullStream, add stdin, stdout & stderr

base/src/main/kotlin/de/staropensource/engine/base/implementable/stream/Stream.kt

@@ -21,7 +21,6 @@ package de.staropensource.engine.base.implementable.stream
 
 import de.staropensource.engine.base.annotation.NonKotlinContact
 import de.staropensource.engine.base.exception.io.IOAccessException
-import de.staropensource.engine.base.implementation.stream.NullStream
 import java.io.IOException
 import java.io.InputStream
 import java.io.OutputStream
@@ -40,11 +39,96 @@ abstract class Stream(val streamMode: StreamMode) : AutoCloseable {
      */
     companion object {
         /**
-         * Returns a [Stream] which does nothing.
+         * Contains the standard input as a [Stream].
+         * It cannot be closed.
+         *
+         * @see <a href="https://man.archlinux.org/man/stdin.3">stdin(3)</a>
+         * @since v1-alpha10
+         */
+        val standardInput: ReadStream = object : ReadStream() {
+            /**
+             * Contains the Java [InputStream]
+             * provided by [System.in].
              *
              * @since v1-alpha10
              */
-        val nullStream: Stream = NullStream.instance
+            val stream: InputStream = System.`in`
+
+            // -----> Closure
+            override fun close() = Unit
+            override fun closeStream() = Unit
+
+
+            // -----> Reading
+            override fun remaining(): Boolean? = null
+            override fun available(): UInt = stream.available().toUInt()
+            override fun readNextByte(): Byte? = stream.read().toByte()
+            override fun readNBytes(n: UInt): ByteArray = stream.readNBytes(n.toInt())
+            override fun readRemainingBytes(): ByteArray = stream.readAllBytes()
+        }
+
+        /**
+         * Contains the standard output as a [Stream].
+         * It cannot be closed.
+         *
+         * @see <a href="https://man.archlinux.org/man/stdout.3">stdout(3)</a>
+         * @since v1-alpha10
+         */
+        val standardOutput: WriteStream = object : WriteStream() {
+            /**
+             * Contains the Java [OutputStream]
+             * provided by [System.out].
+             *
+             * @since v1-alpha10
+             */
+            val stream: OutputStream = System.out
+
+            // -----> Closure
+            override fun close() = Unit
+            override fun closeStream() = Unit
+
+
+            // -----> Writing
+            override fun writeByte(byte: Byte): Stream {
+                stream.write(byte.toInt())
+                return this
+            }
+            override fun writeBytes(bytes: ByteArray): Stream {
+                stream.write(bytes)
+                return this
+            }
+        }
+
+        /**
+         * Contains the standard error as a [Stream].
+         *
+         * @see <a href="https://man.archlinux.org/man/stderr.3">stderr(3)</a>
+         * @since v1-alpha10
+         */
+        val standardError: WriteStream = object : WriteStream() {
+            /**
+             * Contains the Java [OutputStream]
+             * provided by [System.err].
+             *
+             * @since v1-alpha10
+             */
+            val stream: OutputStream = System.err
+
+            // -----> Closure
+            override fun close() = Unit
+            override fun closeStream() = Unit
+
+
+            // -----> Writing
+            override fun writeByte(byte: Byte): Stream {
+                stream.write(byte.toInt())
+                return this
+            }
+            override fun writeBytes(bytes: ByteArray): Stream {
+                stream.write(bytes)
+                return this
+            }
+        }
     }
 
 
@@ -58,7 +142,7 @@ abstract class Stream(val streamMode: StreamMode) : AutoCloseable {
         private set
 
     /**
-     * Contains the [java.io.InputStream]
+     * Contains the Java [InputStream]
      * for this [Stream] instance.
      *
      * @since v1-alpha10
@@ -66,7 +150,7 @@ abstract class Stream(val streamMode: StreamMode) : AutoCloseable {
     private var inputStream: InputFileStream? = null
 
     /**
-     * Contains the [java.io.OutputStream]
+     * Contains the Java [OutputStream]
      * for this [Stream] instance.
      *
      * @since v1-alpha10

base/src/main/kotlin/de/staropensource/engine/base/implementation/stream/NullStream.kt

@@ -22,7 +22,8 @@ package de.staropensource.engine.base.implementation.stream
 import de.staropensource.engine.base.implementable.stream.Stream
 
 /**
- * A [Stream] which does nothing.
+ * A [Stream] which does nothing
+ * and cannot even be closed.
  *
  * @since v1-alpha10
  */