51 lines
1.7 KiB
Java
51 lines
1.7 KiB
Java
package expression;
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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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/**
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* @author Doschennikov Nikita (me@fymio.us)
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*/
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public class High extends AbstractExpression {
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private final AbstractExpression operand;
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public High(AbstractExpression operand) {
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this.operand = operand;
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}
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private static int highestBit(int n) {
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if (n == 0) return 0;
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n |= (n >> 1);
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n |= (n >> 2);
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n |= (n >> 4);
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n |= (n >> 8);
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n |= (n >> 16);
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return n - (n >>> 1);
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}
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@Override public int evaluate(int x) { return highestBit(operand.evaluate(x)); }
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@Override public int evaluate(int x, int y, int z) { return highestBit(operand.evaluate(x,y,z)); }
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@Override public int evaluate(List<Integer> vars) { return highestBit(operand.evaluate(vars)); }
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@Override public BigInteger evaluateBi(List<BigInteger> vars) { throw new UnsupportedOperationException(); }
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@Override public BigDecimal evaluateBd(List<BigDecimal> vars) { throw new UnsupportedOperationException(); }
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@Override public String toString() { return "high(" + operand + ")"; }
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@Override
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public String toMiniString() {
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if (operand instanceof AbstractBinaryOperation) {
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return "high(" + operand.toMiniString() + ")";
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}
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return "high " + 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 High)) return false;
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return operand.equals(((High) obj).operand);
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}
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@Override public int hashCode() { return operand.hashCode() ^ 0x48494748; }
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} |