com.creativewidgetworks.goldparser.parser.Variable Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of goldengine Show documentation
Java implementation of Devin Cook's GOLD Parser engine
There is a newer version: 5.0.5
package com.creativewidgetworks.goldparser.parser;

import java.math.BigDecimal;
import java.sql.Timestamp;

/**
 * Variable 
 *
 * Represents a program variable or interim result. Methods are provided to return the
 * variable as a specified object to avoid external casting.
 *
 * Dependencies: None
 *
 * @author Ralph Iden (http://www.creativewidgetworks.com)
 * @version 5.0.0 
 */
public class Variable {
    private static final String TRUE  = "1,true,";
    private static final String FALSE = "0,false,";
    
    final Object value;

    public Variable(Object theValue) {
        value = theValue;
    }

    public Object asObject() {
        return value;
    }

    public Boolean asBoolean() {
        Boolean b = null;
        if (value != null) {
            if (value instanceof String) {
                String str = ((String)value).toLowerCase() + ",";
                if (TRUE.contains(str)) {
                    b = Boolean.TRUE;
                } else if (FALSE.contains(str)) {
                    b = Boolean.FALSE;
                }
            } else if (value instanceof Boolean) {
                b = (Boolean)value;
            } 
        }
        return b;
    }

    public boolean asBool() {
        Boolean b = asBoolean();
        return b != null ? b.booleanValue() : false;
    }

    public double asDouble() {
        BigDecimal bd = asNumber();
        return bd != null ? bd.doubleValue() : Double.NaN;
    }

    public int asInt() {
        BigDecimal bd = asNumber();
        return bd != null ? bd.intValue() : Integer.MIN_VALUE;
    }

    public BigDecimal asNumber() {
        BigDecimal bd = null;
        if (value != null) {
            if (value instanceof String) {
                try {
                    bd = new BigDecimal((String)value);
                } catch (NumberFormatException nfe) {
                    // null will be returned as type can't be coerced
                }
            } else if (value instanceof BigDecimal) {
                bd = (BigDecimal)value;
            } 
        }
        return bd;
    }

    public String asString() {
        return value != null && value instanceof String ? value.toString() : null;
    }

    public Timestamp asTimestamp() {
        Timestamp ts = null;
        if (value != null) {
            if (value instanceof String) {
                try {
                    ts = Timestamp.valueOf((String)value);
                } catch (IllegalArgumentException iae) {
                    // null will be returned as type can't be coerced
                }
            } else if (value instanceof Timestamp) {
                ts = (Timestamp)value;
            } 
        }        
        
        return ts;
    }
    
    public String toString() {
        return value != null ? value.toString() : "";
    }
}