From 9ce65c5a963b03ee97fe9cb6c5aa65a3c04a80a8 Mon Sep 17 00:00:00 2001
From: yzhou <yujiao.zhou@gmail.com>
Date: Tue, 21 Apr 2015 10:34:27 +0100
Subject: initial version

---
 src/uk/ac/ox/cs/pagoda/query/AnswerTuplesImp.java | 92 +++++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 src/uk/ac/ox/cs/pagoda/query/AnswerTuplesImp.java

(limited to 'src/uk/ac/ox/cs/pagoda/query/AnswerTuplesImp.java')

diff --git a/src/uk/ac/ox/cs/pagoda/query/AnswerTuplesImp.java b/src/uk/ac/ox/cs/pagoda/query/AnswerTuplesImp.java
new file mode 100644
index 0000000..3e0f320
--- /dev/null
+++ b/src/uk/ac/ox/cs/pagoda/query/AnswerTuplesImp.java
@@ -0,0 +1,92 @@
+package uk.ac.ox.cs.pagoda.query;
+
+import java.util.Iterator;
+import java.util.Set;
+
+public class AnswerTuplesImp implements AnswerTuples {
+
+	int m_index; 
+	Iterator<AnswerTuple> m_iter;
+	Set<AnswerTuple> m_answers1, m_answers2; 
+	String[] m_answerVars; 
+	AnswerTuple m_tuple; 
+
+	public AnswerTuplesImp(String[] answerVars, Set<AnswerTuple> answers) {
+		m_answers1 = answers;
+		m_answers2 = null; 
+		m_answerVars = answerVars; 
+		reset(); 
+	}
+	
+	public AnswerTuplesImp(String[] answerVars, Set<AnswerTuple> answers1, Set<AnswerTuple> answers2) {
+		m_answers1 = answers1; 
+		m_answers2 = answers2; 
+		m_answerVars = answerVars; 
+		reset(); 
+	}
+	
+	@Override
+	public boolean isValid() {
+		return m_tuple != null; 
+	}
+
+	@Override
+	public int getArity() {
+		return m_answerVars.length;
+	}
+
+	@Override
+	public void moveNext() {
+		if (m_iter != null && m_iter.hasNext()) {
+			m_tuple = m_iter.next();
+			return ; 
+		}
+		else if (m_answers2 != null && m_index == 1){
+			++m_index; 
+			m_iter = m_answers2.iterator(); 
+			if (m_iter.hasNext()) {
+				m_tuple = m_iter.next();
+				return ; 
+			}
+		}
+		else
+			m_tuple = null; 
+	}
+
+	@Override
+	public void dispose() {}
+
+	@Override
+	public void reset() {
+		if (m_answers1 == null || m_answers1.isEmpty()) {
+			m_index = 2;
+			m_iter = m_answers2 == null ? null : m_answers2.iterator();
+		}
+		else {
+			m_index = 1; 
+			m_iter =  m_answers1.iterator();
+		}		
+		moveNext();
+	}
+
+	@Override
+	public boolean contains(AnswerTuple t) {
+		return m_answers1.contains(t) || (m_answers2 != null && m_answers2.contains(t));
+	}
+
+	@Override
+	public AnswerTuple getTuple() {
+		return m_tuple; 
+	}
+
+	@Override
+	public String[] getAnswerVariables() {
+		return m_answerVars;
+	}
+
+	@Override
+	public void remove() {
+		m_iter.remove();
+	}
+
+}
-- 
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