com.github.dakusui.lisj.func.math.NumCast Maven / Gradle / Ivy

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package com.github.dakusui.lisj.func.math;

import static com.github.dakusui.lisj.Basic.get;
import static com.github.dakusui.lisj.Basic.length;

import java.math.BigDecimal;
import java.math.BigInteger;

import com.github.dakusui.jcunit.core.Utils;
import com.github.dakusui.lisj.Context;
import com.github.dakusui.lisj.FormResult;
import com.github.dakusui.lisj.func.BaseFunc;

public abstract class NumCast extends BaseFunc {

	/**
	 * Serial version UID.
	 */
	private static final long serialVersionUID = 1443793883718558666L;

	@Override
	protected Object checkParams(Object params) {
		Utils.checknull(params);
		if (length(params) != 1) {
			throw new IllegalArgumentException(msgParameterLengthWrong(1, params));
		}
		if (get(params, 0) == null) {
			throw new IllegalArgumentException(msgFirstParameterIsNull(params));
		}
		return params;
	}
	
	@Override
	protected FormResult evaluateLast(Context context,
			Object[] evaluatedParams, FormResult lastResult) {
		Number value = Utils.bigDecimal(Utils.cast(Number.class, evaluatedParams[0]));
		lastResult.value(cast(value));
		return lastResult;
	}

	abstract protected Number cast(Number value);
	
	public static NumCast intValue() {
		return (NumCast) new NumCast() {
			private static final long serialVersionUID = 7924501536036238003L;

			@Override
			protected Integer cast(Number value) {
				return value.intValue();
			}

			@Override
			public String name() {
				return "intValue";
			}
		};
	}

	public static NumCast shortValue() {
		return (NumCast) new NumCast() {
			private static final long serialVersionUID = 6348395673503341773L;

			@Override
			protected Short cast(Number value) {
				return value.shortValue();
			}
			
			@Override
			public String name() {
				return "shortValue";
			}
		};
	}

	public static NumCast longValue() {
		return (NumCast) new NumCast() {
			private static final long serialVersionUID = 2637219747541285577L;

			@Override
			protected Long cast(Number value) {
				return value.longValue();
			}
			
			@Override
			public String name() {
				return "longValue";
			}
		};
	}

	public static NumCast byteValue() {
		return (NumCast) new NumCast() {
			private static final long serialVersionUID = -5880928024002349262L;

			@Override
			protected Byte cast(Number value) {
				return value.byteValue();
			}

			@Override
			public String name() {
				return "byteValue";
			}
		};
	}
	
	public static NumCast doubleValue() {
		return (NumCast) new NumCast() {
			private static final long serialVersionUID = -6719786533694746176L;

			@Override
			protected Double cast(Number value) {
				return value.doubleValue();
			}

			@Override
			public String name() {
				return "doubleValue";
			}
		};
	}

	public static NumCast floatValue() {
		return (NumCast) new NumCast() {
			private static final long serialVersionUID = 6544097137166309639L;

			@Override
			protected Float cast(Number value) {
				return value.floatValue();
			}

			@Override
			public String name() {
				return "floatValue";
			}
		};
	}
	
	public static NumCast bigDecimal() {
		return (NumCast) new NumCast() {
			private static final long serialVersionUID = 8094063785372520905L;

			@Override
			protected BigDecimal cast(Number value) {
				return Utils.bigDecimal(value);
			}

			@Override
			public String name() {
				return "bigDecimal";
			}
		};
	}

	public static NumCast bigInteger() {
		return (NumCast) new NumCast() {
			private static final long serialVersionUID = 2641750630880999212L;

			@Override
			protected BigInteger cast(Number value) {
				return Utils.bigDecimal(value).toBigInteger(); 
			}

			@Override
			public String name() {
				return "bigInteger";
			}
		};
	}
}