source: trunk/org/expeditee/simple/Variables.java@ 4

package org.expeditee.simple;

import java.util.ArrayList;

import org.expeditee.gui.FrameGraphics;

public abstract class Variables<T extends SVariable<?>> {

        protected ArrayList<T> list_;

        public Variables() {
                list_ = new ArrayList<T>();
        }

        public int size() {
                return list_.size();
        }

        public void clear() {
                list_.clear();
        }

        public void display() {
                for (T v : list_) {
                        FrameGraphics.DisplayMessage(v.getName() + ": " + v.stringValue());
                }
        }

        public T getVariable(String name) throws Exception {
                for (T v : list_) {
                        if (v.getName().equalsIgnoreCase(name)) {
                                return v;
                        }
                }
                throw new VariableNotFoundException(name + " is not an existing "
                                + getType());
        }

        /**
         * Sets the value of variable1 to value of variable2. If variable1 doesnt
         * exist then it is created.
         * 
         * @param variableToSet-
         *            the variable whos value will be modified.
         * @param variableWithNewValue-
         *            the variable to get the new value from.
         */
        public void set(String variableToSet, String variableWithNewValue)
                        throws Exception {
                // If the variables are the same then do nothing
                if (variableToSet.equalsIgnoreCase(variableWithNewValue))
                        return;

                T toGetValueFrom = getVariable(variableWithNewValue);
                T toSet = null;
                try {
                        toSet = getVariable(variableToSet);
                } catch (Exception e) {
                        // if the variable to be set doesnt exist and exception is
                        // thrown So it will be added
                        add(variableToSet, toGetValueFrom);
                        return;
                }
                toSet.setValue(toGetValueFrom);
        }

        public abstract void add(String name, T value) throws Exception;

        protected abstract String getType();
}