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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 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; } }





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