first commit

java/expression/Low.java

@@ -0,0 +1,41 @@
+package expression;
+
+import java.math.BigDecimal;
+import java.math.BigInteger;
+import java.util.List;
+
+/**
+ * @author Doschennikov Nikita (me@fymio.us)
+ */
+public class Low extends AbstractExpression {
+    private final AbstractExpression operand;
+
+    public Low(AbstractExpression operand) {
+        this.operand = operand;
+    }
+
+    @Override public int        evaluate(int x)               { int n = operand.evaluate(x);       return n & -n; }
+    @Override public int        evaluate(int x, int y, int z) { int n = operand.evaluate(x,y,z);   return n & -n; }
+    @Override public int        evaluate(List<Integer> vars)  { int n = operand.evaluate(vars);     return n & -n; }
+    @Override public BigInteger evaluateBi(List<BigInteger> vars) { throw new UnsupportedOperationException(); }
+    @Override public BigDecimal evaluateBd(List<BigDecimal> vars) { throw new UnsupportedOperationException(); }
+
+    @Override public String toString()     { return "low(" + operand + ")"; }
+
+    @Override
+    public String toMiniString() {
+        if (operand instanceof AbstractBinaryOperation) {
+            return "low(" + operand.toMiniString() + ")";
+        }
+        return "low " + operand.toMiniString();
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) return true;
+        if (!(obj instanceof Low)) return false;
+        return operand.equals(((Low) obj).operand);
+    }
+
+    @Override public int hashCode() { return operand.hashCode() ^ 0x4C4F5700; }
+}