44 lines
1.6 KiB
Java
44 lines
1.6 KiB
Java
package expression.exceptions;
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import java.math.BigDecimal;
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import java.math.BigInteger;
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import java.util.List;
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import expression.*;
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/**
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* @author Doschennikov Nikita (me@fymio.us)
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*/
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public class CheckedNegate extends AbstractExpression {
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private final AbstractExpression operand;
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public CheckedNegate(AbstractExpression operand) {
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this.operand = operand;
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}
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private static int checkedNegate(int n) {
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if (n == Integer.MIN_VALUE) throw new OverflowException("negation");
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return -n;
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}
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@Override public int evaluate(int x) { return checkedNegate(operand.evaluate(x)); }
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@Override public int evaluate(int x, int y, int z) { return checkedNegate(operand.evaluate(x,y,z)); }
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@Override public int evaluate(List<Integer> vars) { return checkedNegate(operand.evaluate(vars)); }
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@Override public BigInteger evaluateBi(List<BigInteger> vars) { return operand.evaluateBi(vars).negate(); }
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@Override public BigDecimal evaluateBd(List<BigDecimal> vars) { return operand.evaluateBd(vars).negate(); }
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@Override public String toString() { return "-(" + operand + ")"; }
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@Override public String toMiniString() {
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if (operand instanceof AbstractBinaryOperation) return "-(" + operand.toMiniString() + ")";
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return "- " + operand.toMiniString();
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}
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@Override
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public boolean equals(Object obj) {
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if (this == obj) return true;
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if (!(obj instanceof CheckedNegate)) return false;
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return operand.equals(((CheckedNegate) obj).operand);
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}
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@Override public int hashCode() { return -operand.hashCode(); }
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} |