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package com.modulus.qbar.core;
import java.io.Serializable;
import java.util.Map;
import java.util.Set;
/**
* Class is the very root of all the interpreter classes.
* a QBNamespace is anything that has the ability to store variables
* including QBObjects and Functions.
*
* @author jrahm
*
*/
public class QBNamespace implements Serializable{
/**
*
*/
private static final long serialVersionUID = -102581163781603724L;
private QBNamespace superNamespace;
private String name = super.toString();
// The map this namespace delegates,
// This map can be of different types
// like a HashTable.
private Map<String, QBObject> map;
/**
* Creates a new QBNamespace with the map <code>map</code>
* @param map
*/
public QBNamespace( Map<String, QBObject> map ){
this( map, null );
}
public QBNamespace( Map<String, QBObject> map, QBNamespace sup){
this.map = map;
this.superNamespace = sup;
}
/**
* Sets the object with the name <code>name</code>
* to the specific <code>QBObject obj</code>
*
* @param name the name of the variable to set
* @param obj the object to set that name equal to.
*/
public void set(String name, QBObject obj){
this.map.put(name, obj);
}
/**
* Returns the object that is referenced by the
* string <code>name</code> from this Namespace
*
* @param name the name of the object to retrieve
* @return the object referenced as <code>name</code>
*/
public QBObject get(String name){
// System.out.println("THIS: " + this);
QBObject obj = this.map.get(name);
if(obj == null && superNamespace != null)
obj = superNamespace.get(name);
if(obj == null)
throw new RuntimeException("The variable: " + name + " does not exist in the current namespace. " + this);
return obj;
}
/**
* Returns the object that is referenced by the
* string <code>name</code> from this Namespace
*
* This version of the function will not error
* if the object is not found
*
* @param name the name of the object to retrieve
* @return the object referenced as <code>name</code>
*/
public QBObject getNoError(String name){
QBObject obj = this.map.get(name);
if(obj == null && superNamespace != null)
obj = superNamespace.getNoError(name);
return obj;
}
public QBNamespace getSuper(){
return this.superNamespace;
}
public void setSuper( QBNamespace sup ){
this.superNamespace = sup;
}
public String toString2(){
StringBuffer buf = new StringBuffer();
for( String key : this.map.keySet() ){
buf.append(key + ":\t");
buf.append( this.get(key) + "\n");
}
return buf.toString();
}
public Set<String> getKeySet(){
return map.keySet();
}
public boolean hasKey( String key ){
return map.containsKey(key);
}
public QBObject hardGet(String[] args){
QBNamespace cur = this;
for(int i = 0;i < args.length - 1;i ++)
cur = cur.get(args[i]);
return cur.get(args[args.length - 1]);
}
public void hardSet(String[] args, QBObject obj){
QBNamespace cur = this;
for(int i = 0;i < args.length - 1;i ++)
cur = cur.get(args[i]);
cur.set(args[args.length - 1], obj);
}
/**
* Incorporates two namespaces and
* makes them clients to one and other,
* so that if something is added to one,
* then it is added to the other.
*
* @param other the other namespace
*/
public void incoporate( QBNamespace other ){
load( other );
// make the other one your bitch
other.map = this.map;
}
/**
* Same as incorporates, except that in this case,
* the two namespaces remain sovereign and do not
* become clients.
*
* @param other the other namespace
*/
public void load( QBNamespace other ){
for (String key : other.getKeySet() ){
this.set(key, other.get(key));
}
}
}
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