Implement missing equals/hashCode for SourcePosition

sablecc-runtime/src/main/java/de/hhu/stups/sablecc/patch/SourcePosition.java

@@ -6,6 +6,8 @@
 
 package de.hhu.stups.sablecc.patch;
 
+import java.util.Objects;
+
 public class SourcePosition implements Comparable<SourcePosition>  {
 
   private final int line;
@@ -25,6 +27,23 @@ public class SourcePosition implements Comparable<SourcePosition>  {
     return pos;
   }
   
+  @Override
+  public boolean equals(final Object obj) {
+    if (this == obj) {
+      return true;
+    }
+    if (obj == null || this.getClass() != obj.getClass()) {
+      return false;
+    }
+    final SourcePosition other = (SourcePosition)obj;
+    return this.getLine() == other.getLine() && this.getPos() == other.getPos();
+  }
+  
+  @Override
+  public int hashCode() {
+    return Objects.hash(this.getLine(), this.getPos());
+  }
+  
   @Override
   public int compareTo(SourcePosition that) {
     if (this.line < that.line) {