/**
 * Copyright 2006-2007 Jie Li, Xue Yong Zhi
 * Distributed under the BSD License
 */

package com.xruby.runtime.builtin;

import com.xruby.runtime.lang.RubyException;
import com.xruby.runtime.lang.RubyRuntime;
import com.xruby.runtime.lang.RubySymbol;
import com.xruby.runtime.lang.RubyValue;

public class RubyTypesUtil {
    public static RubyTime convertToTime(RubyValue arg) {
        if (arg instanceof RubyTime) {
            return (RubyTime) arg;
        } else {
            throw new RubyException(RubyRuntime.TypeErrorClass, "can't convert " + arg.getRubyClass().getName() + " into Time");
        }
    }

    public static RubySymbol convertToSymbol(RubyValue arg) {
        if (arg instanceof RubySymbol) {
            return (RubySymbol) arg;
        } else if (arg instanceof RubyString) {
            return ObjectFactory.createSymbol(arg.toString());
        } else {
            throw new RubyException(RubyRuntime.TypeErrorClass, "can't convert " + arg.getRubyClass().getName() + " into Symbol");
        }
    }

    public static String convertToJavaString(RubyValue arg) {
        if (arg instanceof RubyString) {
            return ((RubyString) arg).toString();
        } else if (arg instanceof RubySymbol) {
            return ((RubySymbol) arg).toString();
        } else {
            throw new RubyException(RubyRuntime.TypeErrorClass, "can't convert " + arg.getRubyClass().getName() + " into String");
        }
    }

    public static long convertToJavaLong(RubyValue arg) {
        if (arg instanceof RubyFixnum) {
            return ((RubyFixnum) arg).toLong();
        } else if (arg instanceof RubyBignum) {
            return ((RubyBignum) arg).getInternal().longValue();
        } else if (arg instanceof RubyFloat) {
            return (long) ((RubyFloat) arg).doubleValue();
        } else {
            throw new RubyException(RubyRuntime.TypeErrorClass, "can't convert " + arg.getRubyClass().getName() + " into Integer");
        }
    }

    public static double convertToJavaDouble(RubyValue arg) {
        if (arg instanceof RubyFixnum) {
            return ((RubyFixnum) arg).toLong();
        } else if (arg instanceof RubyBignum) {
            return ((RubyBignum) arg).getInternal().longValue();
        } else if (arg instanceof RubyFloat) {
            return ((RubyFloat) arg).doubleValue();
        } else {
            throw new RubyException(RubyRuntime.TypeErrorClass, "can't convert " + arg.getRubyClass().getName() + " into Float");
        }
    }

    public static float convertToJavaFloat(RubyValue arg) {
        if (arg instanceof RubyFixnum) {
            return ((RubyFixnum) arg).toLong();
        } else if (arg instanceof RubyBignum) {
            return ((RubyBignum) arg).getInternal().longValue();
        } else if (arg instanceof RubyFloat) {
            return (float) ((RubyFloat) arg).doubleValue();
        } else {
            throw new RubyException(RubyRuntime.TypeErrorClass, "can't convert " + arg.getRubyClass().getName() + " into Float");
        }
    }
}