first commit

java/expression/Cube.java

@@ -0,0 +1,55 @@
+package expression;
+
+import java.math.BigDecimal;
+import java.math.BigInteger;
+import java.util.List;
+
+/**
+ * @author Doschennikov Nikita (me@fymio.us)
+ */
+public class Cube extends AbstractExpression {
+    private final AbstractExpression operand;
+
+    public Cube(AbstractExpression operand) {
+        this.operand = operand;
+    }
+
+    private static int checkedMul(int a, int b) {
+        if (a == 0 || b == 0) return 0;
+        if (a == Integer.MIN_VALUE || b == Integer.MIN_VALUE) throw new OverflowException("cube");
+        int r = a * b;
+        if (r / a != b) throw new OverflowException("cube");
+        return r;
+    }
+
+    private static int cubeInt(int n) {
+        return checkedMul(checkedMul(n, n), n);
+    }
+
+    @Override public int        evaluate(int x)               { return cubeInt(operand.evaluate(x)); }
+    @Override public int        evaluate(int x, int y, int z) { return cubeInt(operand.evaluate(x,y,z)); }
+    @Override public int        evaluate(List<Integer> vars)  { return cubeInt(operand.evaluate(vars)); }
+    @Override public BigInteger evaluateBi(List<BigInteger> vars) { return operand.evaluateBi(vars).pow(3); }
+    @Override public BigDecimal evaluateBd(List<BigDecimal> vars) { return operand.evaluateBd(vars).pow(3); }
+
+    @Override public String toString()     { return "(" + operand + ")³"; }
+
+    @Override
+    public String toMiniString() {
+        String s = operand.toMiniString();
+        boolean needParens = operand instanceof AbstractBinaryOperation
+                || operand instanceof Cbrt
+                || operand instanceof Sqrt
+                || (s.startsWith("-") && (s.length() < 2 || !Character.isDigit(s.charAt(1))));
+        return needParens ? "(" + s + ")³" : s + "³";
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) return true;
+        if (!(obj instanceof Cube)) return false;
+        return operand.equals(((Cube) obj).operand);
+    }
+
+    @Override public int hashCode() { return operand.hashCode() ^ 0x43554245; }
+}