Migrate Java code to separate QL repo.

java/ql/test/query-tests/WriteOnlyContainer/MapTest.java

@@ -0,0 +1,52 @@
+import java.util.*;
+
+public class MapTest {
+	// should not be flagged since l1 is public
+	public Map<String, Integer> l1 = new HashMap<String, Integer>();
+	
+	// should not be flagged since l2 is a parameter
+	public Map<String, Integer> m(Map<String, Integer> l2) {
+		l2.remove("");
+		// should not be flagged since it is assigned an existing map
+		Map<String, Integer> l3 = l2;
+		// should not be flagged since it is assigned an existing map
+		Map<String, Integer> l33;
+		l33 = l2;
+		// should not be flagged since it is returned
+		Map<String, Integer> s1 = new LinkedHashMap<String, Integer>();
+		// should not be flagged since it is assigned to another variable
+		Map<String, Integer> l4 = new HashMap<String, Integer>();
+		this.l1 = l4;
+		// should not be flagged since its contents are accessed
+		Map<String, Integer> l5 = new HashMap<String, Integer>();
+		if(!l5.containsKey("hello"))
+			l5.put("hello", 23);
+		// should not be flagged since its contents are accessed
+		Map<String, Integer> l6 = new HashMap<String, Integer>();
+		if(l6.remove("") != null)
+			return null;
+		return s1;
+	}
+	
+	public void n(Collection<Map<String, Integer>> ms) {
+		// should not be flagged since it is implicitly assigned an existing collection
+		for (Map<String, Integer> m : ms)
+			m.put("world", 42);
+	}
+	
+	// should be flagged
+	private Map<String, Integer> useless = new HashMap<String, Integer>();
+	{
+		useless.put("hello", 23);
+		useless.remove("hello");
+	}
+	
+	// should not be flagged since it is annotated with @SuppressWarnings("unused")
+	@SuppressWarnings("unused")
+	private Map<String, Integer> l7 = new HashMap<String, Integer>();
+	
+	// should not be flagged since it is annotated with a non-standard annotation suggesting reflective access
+	@interface MyReflectionAnnotation {}
+	@MyReflectionAnnotation
+	private Map<String, Integer> l8 = new HashMap<String, Integer>();
+}