Upload files to "java/expression"

java/expression/Negate.java

@@ -0,0 +1,67 @@
+package expression;
+
+import java.math.BigDecimal;
+import java.math.BigInteger;
+import java.util.List;
+
+/**
+ * @author Doschennikov Nikita (me@fymio.us)
+ */
+public class Negate extends AbstractExpression {
+
+    private final AbstractExpression operand;
+
+    public Negate(AbstractExpression operand) {
+        this.operand = operand;
+    }
+
+    @Override
+    public int evaluate(int x) {
+        return -operand.evaluate(x);
+    }
+
+    @Override
+    public int evaluate(int x, int y, int z) {
+        return -operand.evaluate(x, y, z);
+    }
+
+    @Override
+    public int evaluate(List<Integer> vars) {
+        return -operand.evaluate(vars);
+    }
+
+    @Override
+    public BigInteger evaluateBi(List<BigInteger> vars) {
+        return operand.evaluateBi(vars).negate();
+    }
+
+    @Override
+    public BigDecimal evaluateBd(List<BigDecimal> vars) {
+        return operand.evaluateBd(vars).negate();
+    }
+
+    @Override
+    public String toString() {
+        return "-(" + operand + ")";
+    }
+
+    @Override
+    public String toMiniString() {
+        if (operand instanceof AbstractBinaryOperation) {
+            return "-(" + operand.toMiniString() + ")";
+        }
+        return "- " + operand.toMiniString();
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) return true;
+        if (!(obj instanceof Negate)) return false;
+        return operand.equals(((Negate) obj).operand);
+    }
+
+    @Override
+    public int hashCode() {
+        return -operand.hashCode();
+    }
+}