Gnerified node

.idea/inspectionProfiles/Project_Default.xml

@@ -0,0 +1,6 @@
+<component name="InspectionProjectProfileManager">
+  <profile version="1.0">
+    <option name="myName" value="Project Default" />
+    <inspection_tool class="OptionalGetWithoutIsPresent" enabled="false" level="WARNING" enabled_by_default="false" />
+  </profile>
+</component>

.idea/uiDesigner.xml

@@ -0,0 +1,124 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Palette2">
+    <group name="Swing">
+      <item class="com.intellij.uiDesigner.HSpacer" tooltip-text="Horizontal Spacer" icon="/com/intellij/uiDesigner/icons/hspacer.png" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="1" hsize-policy="6" anchor="0" fill="1" />
+      </item>
+      <item class="com.intellij.uiDesigner.VSpacer" tooltip-text="Vertical Spacer" icon="/com/intellij/uiDesigner/icons/vspacer.png" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="6" hsize-policy="1" anchor="0" fill="2" />
+      </item>
+      <item class="javax.swing.JPanel" icon="/com/intellij/uiDesigner/icons/panel.png" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="3" hsize-policy="3" anchor="0" fill="3" />
+      </item>
+      <item class="javax.swing.JScrollPane" icon="/com/intellij/uiDesigner/icons/scrollPane.png" removable="false" auto-create-binding="false" can-attach-label="true">
+        <default-constraints vsize-policy="7" hsize-policy="7" anchor="0" fill="3" />
+      </item>
+      <item class="javax.swing.JButton" icon="/com/intellij/uiDesigner/icons/button.png" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="3" anchor="0" fill="1" />
+        <initial-values>
+          <property name="text" value="Button" />
+        </initial-values>
+      </item>
+      <item class="javax.swing.JRadioButton" icon="/com/intellij/uiDesigner/icons/radioButton.png" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="3" anchor="8" fill="0" />
+        <initial-values>
+          <property name="text" value="RadioButton" />
+        </initial-values>
+      </item>
+      <item class="javax.swing.JCheckBox" icon="/com/intellij/uiDesigner/icons/checkBox.png" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="3" anchor="8" fill="0" />
+        <initial-values>
+          <property name="text" value="CheckBox" />
+        </initial-values>
+      </item>
+      <item class="javax.swing.JLabel" icon="/com/intellij/uiDesigner/icons/label.png" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="0" anchor="8" fill="0" />
+        <initial-values>
+          <property name="text" value="Label" />
+        </initial-values>
+      </item>
+      <item class="javax.swing.JTextField" icon="/com/intellij/uiDesigner/icons/textField.png" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="0" hsize-policy="6" anchor="8" fill="1">
+          <preferred-size width="150" height="-1" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JPasswordField" icon="/com/intellij/uiDesigner/icons/passwordField.png" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="0" hsize-policy="6" anchor="8" fill="1">
+          <preferred-size width="150" height="-1" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JFormattedTextField" icon="/com/intellij/uiDesigner/icons/formattedTextField.png" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="0" hsize-policy="6" anchor="8" fill="1">
+          <preferred-size width="150" height="-1" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JTextArea" icon="/com/intellij/uiDesigner/icons/textArea.png" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3">
+          <preferred-size width="150" height="50" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JTextPane" icon="/com/intellij/uiDesigner/icons/textPane.png" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3">
+          <preferred-size width="150" height="50" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JEditorPane" icon="/com/intellij/uiDesigner/icons/editorPane.png" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3">
+          <preferred-size width="150" height="50" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JComboBox" icon="/com/intellij/uiDesigner/icons/comboBox.png" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="0" hsize-policy="2" anchor="8" fill="1" />
+      </item>
+      <item class="javax.swing.JTable" icon="/com/intellij/uiDesigner/icons/table.png" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3">
+          <preferred-size width="150" height="50" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JList" icon="/com/intellij/uiDesigner/icons/list.png" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="6" hsize-policy="2" anchor="0" fill="3">
+          <preferred-size width="150" height="50" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JTree" icon="/com/intellij/uiDesigner/icons/tree.png" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3">
+          <preferred-size width="150" height="50" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JTabbedPane" icon="/com/intellij/uiDesigner/icons/tabbedPane.png" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="3" hsize-policy="3" anchor="0" fill="3">
+          <preferred-size width="200" height="200" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JSplitPane" icon="/com/intellij/uiDesigner/icons/splitPane.png" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="3" hsize-policy="3" anchor="0" fill="3">
+          <preferred-size width="200" height="200" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JSpinner" icon="/com/intellij/uiDesigner/icons/spinner.png" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="0" hsize-policy="6" anchor="8" fill="1" />
+      </item>
+      <item class="javax.swing.JSlider" icon="/com/intellij/uiDesigner/icons/slider.png" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="6" anchor="8" fill="1" />
+      </item>
+      <item class="javax.swing.JSeparator" icon="/com/intellij/uiDesigner/icons/separator.png" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3" />
+      </item>
+      <item class="javax.swing.JProgressBar" icon="/com/intellij/uiDesigner/icons/progressbar.png" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="6" anchor="0" fill="1" />
+      </item>
+      <item class="javax.swing.JToolBar" icon="/com/intellij/uiDesigner/icons/toolbar.png" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="6" anchor="0" fill="1">
+          <preferred-size width="-1" height="20" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JToolBar$Separator" icon="/com/intellij/uiDesigner/icons/toolbarSeparator.png" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="0" anchor="0" fill="1" />
+      </item>
+      <item class="javax.swing.JScrollBar" icon="/com/intellij/uiDesigner/icons/scrollbar.png" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="6" hsize-policy="0" anchor="0" fill="2" />
+      </item>
+    </group>
+  </component>
+</project>

src/search/breadthfirstsearch/BreadthFirstSearch.java

@@ -1,16 +1,15 @@
 package search.breadthfirstsearch;
 
 import java.util.ArrayList;
-import java.util.Arrays;
 import java.util.List;
 
 public class BreadthFirstSearch
 {
-    public Node breadthFirstSearch(List<Node> nodes, Node target)
+    public <T> Node<T> breadthFirstSearch(List<Node<T>> nodes, Node<T> target)
     {
-        var newNodes = new ArrayList<Node>();
+        var newNodes = new ArrayList<Node<T>>();
 
-        for (Node node : nodes)
+        for (Node<T> node : nodes)
         {
             if (node.isTargetReached(target))
             {

src/search/breadthfirstsearch/EightPuzzleNode.java

@@ -6,28 +6,26 @@ import java.util.List;
 import java.util.Objects;
 import java.util.stream.IntStream;
 
-public class EightPuzzleNode implements Node
+public class EightPuzzleNode extends Node<int[][]>
 {
-    private int[][] state;
-
     public EightPuzzleNode(int[][] state)
     {
-        if (!isValidState(state))
+        super(state);
-        {
+    }
-            throw new IllegalArgumentException("Allowed numbers are only 0-8 and they must exist uniquely.");
-        }
 
-        this.state = state;
+    private EightPuzzleNode(int[][] value, Node<int[][]> parent)
+    {
+        super(value, parent);
     }
 
     @Override
-    public boolean isTargetReached(Node target)
+    public boolean isTargetReached(Node<int[][]> target)
     {
-        for (int row = 0; row < this.state.length; row++)
+        for (int row = 0; row < super.value.length; row++)
         {
-            for (int col = 0; col < this.state[row].length; col++)
+            for (int col = 0; col < super.value[row].length; col++)
             {
-                if (this.state[row][col] != ((EightPuzzleNode) target).state[row][col])
+                if (super.value[row][col] != target.value[row][col])
                 {
                     return false;
                 }
@@ -38,9 +36,9 @@ public class EightPuzzleNode implements Node
     }
 
     @Override
-    public List<Node> generateSuccessors()
+    public List<Node<int[][]>> generateSuccessors()
     {
-        var successors = new ArrayList<Node>();
+        var successors = new ArrayList<Node<int[][]>>();
         var emptyPosition = Objects.requireNonNull(detectEmptyPosition());
         int x = emptyPosition.getRight();
         int y = emptyPosition.getLeft();
@@ -58,25 +56,25 @@ public class EightPuzzleNode implements Node
                         tmp = newState[y-1][x];
                         newState[y-1][x] = newState[y][x];
                         newState[y][x] = tmp;
-                        successors.add(new EightPuzzleNode(newState));
+                        successors.add(new EightPuzzleNode(newState, this));
                         break;
                     case RIGHT:
                         tmp = newState[y][x+1];
                         newState[y][x+1] = newState[y][x];
                         newState[y][x] = tmp;
-                        successors.add(new EightPuzzleNode(newState));
+                        successors.add(new EightPuzzleNode(newState, this));
                         break;
                     case DOWN:
                         tmp = newState[y+1][x];
                         newState[y+1][x] = newState[y][x];
                         newState[y][x] = tmp;
-                        successors.add(new EightPuzzleNode(newState));
+                        successors.add(new EightPuzzleNode(newState, this));
                         break;
                     case LEFT:
                         tmp = newState[y][x-1];
                         newState[y][x-1] = newState[y][x];
                         newState[y][x] = tmp;
-                        successors.add(new EightPuzzleNode(newState));
+                        successors.add(new EightPuzzleNode(newState, this));
                         break;
                 }
             }
@@ -88,12 +86,8 @@ public class EightPuzzleNode implements Node
         return successors;
     }
 
-    public int[][] getState()
+    @Override
-    {
+    protected boolean isValidValue(int[][] state)
-        return state;
-    }
-
-    private boolean isValidState(int[][] state)
     {
         var numbers = Arrays.stream(state).flatMapToInt(IntStream::of).toArray();
 
@@ -112,11 +106,11 @@ public class EightPuzzleNode implements Node
 
     private IntPair detectEmptyPosition()
     {
-        for (int row = 0; row < this.state.length; row++)
+        for (int row = 0; row < super.value.length; row++)
         {
-            for (int col = 0; col < this.state[row].length; col++)
+            for (int col = 0; col < super.value[row].length; col++)
             {
-                if (state[row][col] == 0)
+                if (super.value[row][col] == 0)
                 {
                     return new IntPair(row, col);
                 }
@@ -132,7 +126,7 @@ public class EightPuzzleNode implements Node
 
         for (int y = 0; y < copy.length; y++)
         {
-            System.arraycopy(this.state[y], 0, copy[y], 0, copy.length);
+            System.arraycopy(super.value[y], 0, copy[y], 0, copy.length);
         }
 
         return copy;
@@ -141,9 +135,9 @@ public class EightPuzzleNode implements Node
     @Override
     public String toString()
     {
-        StringBuilder builder = new StringBuilder();
+        StringBuilder builder = new StringBuilder("Node:\n");
 
-        for (int[] row : this.state)
+        for (int[] row : super.value)
         {
             builder.append(Arrays.toString(row)).append("\n");
         }

src/search/breadthfirstsearch/Node.java

@@ -2,8 +2,44 @@ package search.breadthfirstsearch;
 
 import java.util.List;
 
-public interface Node
+public abstract class Node<T>
 {
-    boolean isTargetReached(Node target);
+    protected T value;
-    List<Node> generateSuccessors();
+    private Node<T> parent;
+
+    protected Node(T value)
+    {
+        this(value, null);
+    }
+
+    protected Node(T value, Node<T> parent)
+    {
+        if (!isValidValue(value))
+        {
+            throw new IllegalArgumentException("Illegal node value");
+        }
+
+        this.value = value;
+        this.parent = parent;
+    }
+
+    public T getValue()
+    {
+        return this.value;
+    }
+
+    public Node<T> getParent()
+    {
+        return this.parent;
+    }
+
+    @Override
+    public String toString()
+    {
+        return this.value.toString();
+    }
+
+    protected abstract boolean isValidValue(T value);
+    public abstract boolean isTargetReached(Node<T> target);
+    public abstract List<Node<T>> generateSuccessors();
 }

test/search/breadthfirstsearch/BreadthFirstSearchTest.java

@@ -5,8 +5,6 @@ import org.junit.jupiter.api.Test;
 import java.util.Arrays;
 import java.util.List;
 
-import static org.junit.jupiter.api.Assertions.*;
-
 class BreadthFirstSearchTest
 {
     @Test
@@ -19,7 +17,6 @@ class BreadthFirstSearchTest
         };
         var root = new EightPuzzleNode(state);
 
-
         int[][] targetState = {
                 {1, 2, 3},
                 {4, 5, 6},
@@ -32,4 +29,9 @@ class BreadthFirstSearchTest
         System.out.println("Target: " + Arrays.deepToString(targetState));
         System.out.println("Actual:\n" + actual);
     }
+
+    private void printSolution(Node<int[][]> targetNode)
+    {
+
+    }
 }

test/search/breadthfirstsearch/EightPuzzleNodeTest.java

@@ -3,9 +3,6 @@ package search.breadthfirstsearch;
 import org.junit.jupiter.api.Assertions;
 import org.junit.jupiter.api.Test;
 
-import java.util.Arrays;
-import java.util.List;
-
 class EightPuzzleNodeTest
 {
     @Test
@@ -120,8 +117,8 @@ class EightPuzzleNodeTest
                 {0, 5, 8}
         };
 
-        Assertions.assertArrayEquals(newState1, ((EightPuzzleNode) successors.get(0)).getState());
+        Assertions.assertArrayEquals(newState1, successors.get(0).getValue());
-        Assertions.assertArrayEquals(newState2, ((EightPuzzleNode) successors.get(1)).getState());
+        Assertions.assertArrayEquals(newState2, successors.get(1).getValue());
-        Assertions.assertArrayEquals(newState3, ((EightPuzzleNode) successors.get(2)).getState());
+        Assertions.assertArrayEquals(newState3, successors.get(2).getValue());
     }
 }