Finish part 1

p3/.settings/org.eclipse.jdt.core.prefs

@@ -1,7 +1,9 @@
 eclipse.preferences.version=1
 org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.5
 org.eclipse.jdt.core.compiler.compliance=1.5
+org.eclipse.jdt.core.compiler.problem.enablePreviewFeatures=disabled
 org.eclipse.jdt.core.compiler.problem.forbiddenReference=warning
+org.eclipse.jdt.core.compiler.problem.reportPreviewFeatures=ignore
 org.eclipse.jdt.core.compiler.processAnnotations=disabled
 org.eclipse.jdt.core.compiler.release=disabled
 org.eclipse.jdt.core.compiler.source=1.5

p3/src/relop/FileScan.java

@@ -12,7 +12,7 @@ public class FileScan extends Iterator {
 	private HeapFile file = null; // needed for restart(), getFile();
 	private HeapScan scan = null;
 	private RID rid = null;
-	private boolean isOpen;
+	private boolean isOpen = false;
 
   /**
    * Constructs a file scan, given the schema and heap file.

p3/src/relop/IndexScan.java

@@ -1,5 +1,7 @@
 package relop;
 
+import global.RID;
+import index.BucketScan;
 import global.SearchKey;
 import heap.HeapFile;
 import index.HashIndex;
@@ -8,13 +10,21 @@ import index.HashIndex;
  * Wrapper for bucket scan, an index access method.
  */
 public class IndexScan extends Iterator {
+  private HeapFile file = null;
+  private BucketScan scan = null;
+  private HashIndex index = null;
+  private boolean isOpen = false;
 
 
   /**
    * Constructs an index scan, given the hash index and schema.
    */
   public IndexScan(Schema schema, HashIndex index, HeapFile file) {
-	  throw new UnsupportedOperationException("Not implemented");
+	this.file = file;
+	this.schema = schema;
+	this.index = index;
+	this.scan = this.index.openScan();
+	this.isOpen = true;
   }
 
   /**
@@ -29,28 +39,42 @@ public class IndexScan extends Iterator {
    * Restarts the iterator, i.e. as if it were just constructed.
    */
   public void restart() {
-	  throw new UnsupportedOperationException("Not implemented");
+	if (this.isOpen()) {
+		scan.close();
+		this.isOpen = false;
+	}
+
+	this.scan = this.index.openScan();
+	this.isOpen = true;
   }
 
   /**
    * Returns true if the iterator is open; false otherwise.
    */
   public boolean isOpen() {
-	  throw new UnsupportedOperationException("Not implemented");
+	return this.isOpen;
   }
 
   /**
    * Closes the iterator, releasing any resources (i.e. pinned pages).
    */
   public void close() {
-	  throw new UnsupportedOperationException("Not implemented");
+	if (this.isOpen()) {
+		this.scan.close();
+		this.scan = null;
+		this.isOpen = false;
+	}
   }
 
   /**
    * Returns true if there are more tuples, false otherwise.
    */
   public boolean hasNext() {
-	  throw new UnsupportedOperationException("Not implemented");
+	if (this.isOpen()) {
+		return this.scan.hasNext();
+	}
+
+	return false;
   }
 
   /**
@@ -59,14 +83,21 @@ public class IndexScan extends Iterator {
    * @throws IllegalStateException if no more tuples
    */
   public Tuple getNext() {
-	  throw new UnsupportedOperationException("Not implemented");
+	if (this.isOpen()) {
+		RID rid = this.scan.getNext();
+		byte[] data = this.file.selectRecord(rid);
+		Tuple tuple = new Tuple(this.getSchema(), data);
+		return tuple;
+	}
+
+	return null;
   }
 
   /**
    * Gets the key of the last tuple returned.
    */
   public SearchKey getLastKey() {
-	  throw new UnsupportedOperationException("Not implemented");
+	return this.scan.getLastKey();
   }
 
   /**
@@ -74,7 +105,7 @@ public class IndexScan extends Iterator {
    * number of buckets if none.
    */
   public int getNextHash() {
-	  throw new UnsupportedOperationException("Not implemented");
+	return this.scan.getNextHash();
   }
 
 } // public class IndexScan extends Iterator

p3/src/relop/KeyScan.java

@@ -1,5 +1,6 @@
 package relop;
 
+import global.RID;
 import global.SearchKey;
 import heap.HeapFile;
 import index.HashIndex;
@@ -67,7 +68,11 @@ public class KeyScan extends Iterator {
    * Returns true if there are more tuples, false otherwise.
    */
   public boolean hasNext() {
-	throw new UnsupportedOperationException("Not implemented");
+	if (this.isOpen()) {
+		return this.scan.hasNext();
+	}
+
+	return false;
   }
 
   /**
@@ -76,7 +81,15 @@ public class KeyScan extends Iterator {
    * @throws IllegalStateException if no more tuples
    */
   public Tuple getNext() {
-	throw new UnsupportedOperationException("Not implemented");
+	if (this.isOpen()) {
+		RID rid = scan.getNext();
+		byte[] data = this.file.selectRecord(rid);
+		Tuple tuple = new Tuple(this.getSchema(), data);
+
+		return tuple;
+	}
+
+	return null;
   }
 
 } // public class KeyScan extends Iterator