Application: gvSIG desktop

package org.gvsig.expressionevaluator.impl;

import org.gvsig.expressionevaluator.ExpressionEvaluatorLocator;

import org.gvsig.expressionevaluator.SymbolTable;

import org.gvsig.expressionevaluator.spi.AbstractSymbolTable;

/**

 *

 * @author jjdelcerro

 */

public class InmutableSymbolTable 

        extends AbstractSymbolTable

        implements SymbolTable {

    private boolean locked;

    public InmutableSymbolTable() {

        this.locked = false;

        this.init();

    }

    private void init() {

        DefaultExpressionEvaluatorManager manager = (DefaultExpressionEvaluatorManager) ExpressionEvaluatorLocator.getManager();

        manager.populateSymbolTable(this);

        this.locked = true;

    }

    @Override

    public boolean addSymbolTable(SymbolTable symbolTable) {

        if( this.locked ) {

            throw new UnsupportedOperationException();

        }

        return super.addSymbolTable(symbolTable); 

    }

    @Override

    public boolean removeSymbolTable(SymbolTable symbolTable) {

        throw new UnsupportedOperationException();

    }

}