/*
* Value.java
*
* Created on January 4, 2001, 11:37 AM
*/
package org.freehep.util;
import java.lang.reflect.Constructor;
import java.util.Date;
import java.text.SimpleDateFormat;
import java.text.ParseException;
/**
* A class that can represent any Java object or primitive. Unlike the
* built-in primitive proxies (Double, Integer etc) it is mutable. It is
* used to allow values to be used without needing overloaded methods for
* each primitive type, and without the overhead of object creation/deletion.
*
* When a value is returned by an Object method it should be assumed to be valid
* only until the next method call to that Object. The use of Value should be
* avoided in multi-threaded environments.
*
* @author tonyj
* @version $Id: Value.java 9133 2006-10-13 16:25:43Z turri $
*/
public class Value {
private int intValue;
private short shortValue;
private long longValue;
private float floatValue;
private double doubleValue;
private boolean boolValue;
private byte byteValue;
private char charValue;
private Object obj;
private Class type;
public final static Class TYPE_INTEGER = Integer.TYPE;
public final static Class TYPE_SHORT = Short.TYPE;
public final static Class TYPE_LONG = Long.TYPE;
public final static Class TYPE_FLOAT = Float.TYPE;
public final static Class TYPE_DOUBLE = Double.TYPE;
public final static Class TYPE_BOOLEAN = Boolean.TYPE;
public final static Class TYPE_BYTE = Byte.TYPE;
public final static Class TYPE_CHAR = Character.TYPE;
public final static Class TYPE_STRING = String.class;
public final static Class TYPE_DATE = Date.class;
public Value() {}
public Value( Value v ) {
setValue(v);
}
public Value setValue(Value v) {
this.type = v.getType();
this.intValue = v.intValue;
this.shortValue = v.shortValue;
this.longValue = v.longValue;
this.floatValue = v.floatValue;
this.doubleValue = v.doubleValue;
this.boolValue = v.boolValue;
this.byteValue = v.byteValue;
this.charValue = v.charValue;
this.obj = v.obj;
return this;
}
/**
* Get the Value's type
* @return The Class of this Value.
*
*/
public Class getType() {
return type;
}
/**
* Set the Value's internal value to an integer.
* @param val The integer value.
* @return The Value object with the given internal value.
*
*/
public Value set(int val) { intValue = val; type = TYPE_INTEGER; return this; }
/**
* Set the Value's internal value to a short.
* @param val The short value.
* @return The Value object with the given internal value.
*
*/
public Value set(short val) { shortValue = val; type = TYPE_SHORT; return this; }
/**
* Set the Value's internal value to a long.
* @param val The long value.
* @return The Value object with the given internal value.
*
*/
public Value set(long val) { longValue = val; type = TYPE_LONG; return this; }
/**
* Set the Value's internal value to a float.
* @param val The float value.
* @return The Value object with the given internal value.
*
*/
public Value set(float val) { floatValue = val; type = TYPE_FLOAT; return this; }
/**
* Set the Value's internal value to a double.
* @param val The double value.
* @return The Value object with the given internal value.
*
*/
public Value set(double val) { doubleValue = val; type = TYPE_DOUBLE; return this; }
/**
* Set the Value's internal value to a boolean.
* @param val The boolean value.
* @return The Value object with the given internal value.
*
*/
public Value set(boolean val){ boolValue = val; type = TYPE_BOOLEAN; return this; }
/**
* Set the Value's internal value to a byte.
* @param val The byte value.
* @return The Value object with the given internal value.
*
*/
public Value set(byte val) { byteValue = val; type = TYPE_BYTE; return this; }
/**
* Set the Value's internal value to a char.
* @param val The char value.
* @return The Value object with the given internal value.
*
*/
public Value set(char val) { charValue = val; type = TYPE_CHAR; return this; }
/**
* Set the Value's internal value to a String.
* @param val The String value.
* @return The Value object with the given internal value.
*
*/
public Value set(String val) { obj = val; type = TYPE_STRING; return this; }
/**
* Set the Value's internal value to a Date.
* @param val The Date value.
* @return The Value object with the given internal value.
*
*/
public Value set(Date val) { obj = val; type = TYPE_DATE; return this; }
/**
* Set the Value's internal value to an Object.
* @param val The Object value.
* @return The Value object with the given internal value.
*
*/
public Value set(Object val) { obj = val; type = obj == null ? Object.class : obj.getClass(); return this; }
/**
* Get the integer value.
* @return The int value.
* @exception A ClassCastException is thrown if this Value has incompatible type.
*
*/
public int getInt() {
if (type == TYPE_INTEGER) return intValue;
else if (type == TYPE_SHORT) return shortValue;
else if (type == TYPE_BYTE) return byteValue;
else throw new ClassCastException( "getInt cannot be called for type "+type.toString());
}
/**
* Get the short value.
* @return The short value.
* @exception A ClassCastException is thrown if this Value has incompatible type.
*
*/
public short getShort() {
if (type == TYPE_SHORT) return shortValue;
else if (type == TYPE_BYTE) return byteValue;
else throw new ClassCastException( "getShort cannot be called for type "+type.toString());
}
/**
* Get the long value.
* @return The long value.
* @exception A ClassCastException is thrown if this Value has incompatible type.
*
*/
public long getLong() {
if (type == TYPE_LONG) return longValue;
else if (type == TYPE_INTEGER) return intValue;
else if (type == TYPE_SHORT) return shortValue;
else if (type == TYPE_BYTE) return byteValue;
else throw new ClassCastException( "getLong cannot be called for type "+type.toString());
}
/**
* Get the float value.
* @return The float value.
* @exception A ClassCastException is thrown if this Value has incompatible type.
*
*/
public float getFloat() {
if (type == TYPE_FLOAT) return floatValue;
else if (type == TYPE_INTEGER) return intValue;
else if (type == TYPE_SHORT) return shortValue;
else if (type == TYPE_LONG) return longValue;
else if (type == TYPE_BYTE) return byteValue;
else throw new ClassCastException( "getFloat cannot be called for type "+type.toString());
}
/**
* Get the double value.
* @return The double value.
* @exception A ClassCastException is thrown if this Value has incompatible type.
*
*/
public double getDouble() {
if (type == TYPE_DOUBLE) return doubleValue;
else if (type == TYPE_INTEGER) return intValue;
else if (type == TYPE_SHORT) return shortValue;
else if (type == TYPE_LONG) return longValue;
else if (type == TYPE_FLOAT) return floatValue;
else if (type == TYPE_BYTE) return byteValue;
else if (type == TYPE_DATE) return ((Date)obj).getTime();
else throw new ClassCastException( "getDouble cannot be called for type "+type.toString());
}
/**
* Get the boolean value.
* @return The boolean value.
* @exception A ClassCastException is thrown if this Value has incompatible type.
*
*/
public boolean getBoolean() {
if (type == TYPE_BOOLEAN) return boolValue;
else throw new ClassCastException( "getBoolean cannot be called for type "+type.toString());
}
/**
* Get the byte value.
* @return The byte value.
* @exception A ClassCastException is thrown if this Value has incompatible type.
*
*/
public byte getByte() {
if (type == TYPE_BYTE) return byteValue;
else throw new ClassCastException( "getByte cannot be called for type "+type.toString());
}
/**
* Get the char value.
* @return The char value.
* @exception A ClassCastException is thrown if this Value has incompatible type.
*
*/
public char getChar() {
if (type == TYPE_CHAR) return charValue;
else throw new ClassCastException( "getChar cannot be called for type "+type.toString());
}
/**
* Get the String value.
* @return The String representation of the internal value.
*
*/
public String getString() {
if (type == TYPE_STRING) return (String)obj;
else if (type == TYPE_INTEGER) return String.valueOf(intValue);
else if (type == TYPE_SHORT) return String.valueOf(shortValue);
else if (type == TYPE_LONG) return String.valueOf(longValue);
else if (type == TYPE_FLOAT) return String.valueOf(floatValue);
else if (type == TYPE_DOUBLE) return String.valueOf(doubleValue);
else if (type == TYPE_BOOLEAN) return String.valueOf(boolValue);
else if (type == TYPE_BYTE) return String.valueOf(byteValue);
else if (type == TYPE_CHAR) return String.valueOf(charValue);
else if (type == TYPE_DATE) return ((Date)obj).toString();
else return obj != null ? obj.toString(): "null";
}
/**
* Get the Date value.
* @return The Date value.
* @exception A ClassCastException is thrown if this Value has incompatible type.
*
*/
public Date getDate() {
if (type == TYPE_DATE) return (Date)obj;
else throw new ClassCastException( "getDate cannot be called for type "+type.toString());
}
/**
* Get the Object value.
* @return The Object value.
*
*/
public Object getObject() {
if (obj != null) return obj;
else if (type == TYPE_INTEGER) return new Integer(intValue);
else if (type == TYPE_SHORT) return new Short(shortValue);
else if (type == TYPE_LONG) return new Long(longValue);
else if (type == TYPE_FLOAT) return new Float(floatValue);
else if (type == TYPE_DOUBLE) return new Double(doubleValue);
else if (type == TYPE_BOOLEAN) return new Boolean(boolValue);
else if (type == TYPE_BYTE) return new Byte(byteValue);
else if (type == TYPE_CHAR) return new Character(charValue);
else return null;
}
/**
* Get the String value.
* @return The String representation of the internal value.
*
*/
public String toString() {
return getString();
}
/**
* Returns an external representation of this value
*/
public String toExternal() {
// FIXME, does not work for arrays...
return type.getName()+":"+getString();
}
/**
* Set to value from the external respresentation
*/
public Value fromExternal(String external) throws IllegalArgumentException {
String[] part = external.split(":", 2);
if (part.length != 2)
throw new IllegalArgumentException(getClass()+": External '"+external+
"'does not contain ':' to separate type from value.");
if (part[0].equals(TYPE_STRING.getName())) {
return set(part[1]);
} else if (part[0].equals(TYPE_SHORT.getName())) {
return set(Short.parseShort(part[1]));
} else if (part[0].equals(TYPE_LONG.getName())) {
return set(Long.parseLong(part[1]));
} else if (part[0].equals(TYPE_FLOAT.getName())) {
return set(Float.parseFloat(part[1]));
} else if (part[0].equals(TYPE_DOUBLE.getName())) {
return set(Double.parseDouble(part[1]));
} else if (part[0].equals(TYPE_BOOLEAN.getName())) {
return set(Boolean.getBoolean(part[1]));
} else if (part[0].equals(TYPE_BYTE.getName())) {
return set(Byte.parseByte(part[1]));
} else if (part[0].equals(TYPE_CHAR.getName())) {
return set(part[1].charAt(0));
} else if (part[0].equals(TYPE_INTEGER.getName())) {
return set(Integer.parseInt(part[1]));
} else if (part[0].equals(TYPE_DATE.getName())) {
try {
return set(new SimpleDateFormat().parse(part[1]));
} catch (ParseException e) {
throw new IllegalArgumentException(e.getMessage());
}
} else if (part[0].equals(Object.class.getName()) && part[1].equals("null")) {
return set((Object)null);
} else {
// FIXME will not work for arrays, which are encoded as "[Lpackagename.classname;"
try {
Class cls = Class.forName(part[0]);
Constructor ctor = cls.getDeclaredConstructor(new Class[] { String.class });
ctor.setAccessible(true);
return set(ctor.newInstance(new Object[] { part[1] }));
} catch (Exception e) {
throw new IllegalArgumentException(getClass()+": Cannot reconstruct value from type: "+part[0]+", "
+"and value "+part[1]+", due to "+e.getMessage());
}
}
}
}
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