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package org.luaj.vm2;
/** Upvalue used with Closure formulation
*
* @see LuaClosure
* @see Prototype
*/
public final class UpValue {
LuaValue[] array; // initially the stack, becomes a holder
int index;
/**
* Create an upvalue relative to a stack
* @param stack the stack
* @param index the index on the stack for the upvalue
*/
public UpValue( LuaValue[] stack, int index) {
this.array = stack;
this.index = index;
}
public String toString() {
return index + "/" + array.length + " " + array[index];
}
/**
* Convert this upvalue to a Java String
* @return the Java String for this upvalue.
* @see LuaValue#tojstring()
*/
public String tojstring() {
return array[index].tojstring();
}
/**
* Get the value of the upvalue
* @return the {@link LuaValue} for this upvalue
*/
public final LuaValue getValue() {
return array[index];
}
/**
* Set the value of the upvalue
* @param value the {@link LuaValue} to set it to
*/
public final void setValue( LuaValue value ) {
array[index] = value;
}
/**
* Close this upvalue so it is no longer on the stack
*/
public final void close() {
LuaValue[] old = array;
array = new LuaValue[] { old[index] };
old[index] = null;
index = 0;
}
}