add composite in java in design-patterns

MikhailDeriabin · Sep 19, 2024 · fa7e9e4 · fa7e9e4
1 parent 96dda72
commit fa7e9e4
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diff --git a/design-patterns-2/java/app/src/main/java/org/patterns/App.java b/design-patterns-2/java/app/src/main/java/org/patterns/App.java
@@ -1,7 +1,7 @@
 package org.patterns;
 
 import org.patterns.patterns.IRunner;
-import org.patterns.patterns.decorator.*;
+import org.patterns.patterns.composite.*;
 
 public class App {
     public static void main(String[] args) {

diff --git a/design-patterns-2/java/app/src/main/java/org/patterns/patterns/composite/BinaryFile.java b/design-patterns-2/java/app/src/main/java/org/patterns/patterns/composite/BinaryFile.java
@@ -0,0 +1,32 @@
+package org.patterns.patterns.composite;
+
+/**
+ * Leaf node in composite pattern.
+ * Leaf has the most basic operations
+ */ 
+public class BinaryFile extends File{
+
+    public BinaryFile(String name) {
+        super(name);
+    }
+
+    @Override
+    public void ls() {
+        System.out.println(this.getIntendString() + "-" + this.getName());
+    }
+
+    @Override
+    public void addFile(File file) {
+        throw new UnsupportedOperationException("Unimplemented method 'addFile'");
+    }
+
+    @Override
+    public File[] getFiles() {
+        throw new UnsupportedOperationException("Unimplemented method 'getFiles'");
+    }
+
+    @Override
+    public boolean removeFile(File file) {
+        throw new UnsupportedOperationException("Unimplemented method 'removeFile'");
+    }
+}
diff --git a/design-patterns-2/java/app/src/main/java/org/patterns/patterns/composite/Directory.java b/design-patterns-2/java/app/src/main/java/org/patterns/patterns/composite/Directory.java
@@ -0,0 +1,41 @@
+package org.patterns.patterns.composite;
+
+import java.util.ArrayList;
+
+/**
+ * Composite in the composite pattern
+ * That means it contains leaves or other composite objects inside of it (files list)
+ */ 
+public class Directory extends File{
+
+    public Directory(String name) {
+        super(name);
+        files = new ArrayList<File>();
+    }
+
+    private ArrayList<File> files; 
+
+    @Override
+    public void ls() {
+        System.out.println(this.getIntendString() + "/" + this.getName());
+        for (File file : files) {
+            file.addIntend(this.getIntend() + 2);
+            file.ls();
+        }
+    }
+
+    @Override
+    public void addFile(File file) {
+        this.files.add(file);
+    }
+
+    @Override
+    public File[] getFiles() {
+        return files.toArray(new File[files.size()]);
+    }
+
+    @Override
+    public boolean removeFile(File file) {
+        return files.remove(file);
+    }
+}
diff --git a/design-patterns-2/java/app/src/main/java/org/patterns/patterns/composite/File.java b/design-patterns-2/java/app/src/main/java/org/patterns/patterns/composite/File.java
@@ -0,0 +1,63 @@
+package org.patterns.patterns.composite;
+
+/**
+ * The component base class for composite pattern
+ * defines operations applicable both leaf & composite
+ */ 
+public abstract class File {
+
+	private String name;
+	private int intend;
+
+	public File(String name) {
+		this.name = name;
+		this.intend = 0;
+	}
+
+	public String getName() {
+		return name;
+	}
+
+	public void setName(String name) {
+		this.name = name;
+	}
+
+	protected String getIntendString(){
+		String intendStr = "";
+
+		for (int i = 0; i < intend; i++) {
+			intendStr += " ";
+		}
+		return intendStr;
+	}
+	protected void addIntend(int amount){
+		this.intend += amount;
+	}
+	protected int getIntend(){
+		return this.intend;
+	}
+
+	@Override
+    public boolean equals(Object object){
+        if(object == this)
+            return true;
+
+        if(object == null)
+            return false;
+
+        if(object.getClass() != this.getClass())
+            return false;
+
+        File parsedObject = (File) object;
+
+        return parsedObject.getName() == this.getName();
+    }
+
+	public abstract void ls();
+
+	public abstract void addFile(File file);
+
+	public abstract File[] getFiles();
+
+	public abstract boolean removeFile(File file);
+}
diff --git a/design-patterns-2/java/app/src/main/java/org/patterns/patterns/composite/Runner.java b/design-patterns-2/java/app/src/main/java/org/patterns/patterns/composite/Runner.java
@@ -0,0 +1,28 @@
+package org.patterns.patterns.composite;
+
+import org.patterns.patterns.IRunner;
+
+public class Runner implements IRunner{
+    @Override
+    public void run(int exampleNum) {
+        Directory myDir1 = new Directory("myDir1");
+
+        File myFile1 = new BinaryFile("myFile1");
+        File myFile2 = new BinaryFile("myFile2");
+        File myFile3 = new BinaryFile("myFile3");
+
+        myDir1.addFile(myFile1);
+        myDir1.addFile(myFile2);
+        myDir1.addFile(myFile3);
+
+        Directory myDir2 = new Directory("myDir2");
+        File myFile4 = new BinaryFile("myFile4");
+        File myFile5 = new BinaryFile("myFile5");
+        myDir2.addFile(myFile4);
+        myDir2.addFile(myFile5);
+
+        myDir1.addFile(myDir2);
+
+        myDir1.ls();
+    }
+}