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

package org.expeditee.simple;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;

import org.expeditee.gui.Frame;
import org.expeditee.gui.FrameGraphics;
import org.expeditee.gui.FrameIO;

public class Context {
        private Primitives primitives_ = new Primitives();

        private Pointers pointers_ = new Pointers();

        public Primitives getPrimitives() {
                return primitives_;
        }

        public Pointers getPointers() {
                return pointers_;
        }

        public Context() {
        }

        public int size() {
                return primitives_.size() + pointers_.size();
        }

        public void clear() {
                primitives_.clear();
                pointers_.clear();
        }

        public void display() {
                if (size() == 0) {
                        FrameGraphics.ErrorMessage("No variables exist!");
                        return;
                }

                primitives_.display();
                pointers_.display();
        }

        /**
         * 
         * @param var1
         * @param var2
         * @return
         * @throws Exception
         *             if the variables could not be converted to the same type.
         */
        public boolean equalValues(String var1, String var2) throws Exception {
                if (Primitives.isPrimitive(var1) && Primitives.isPrimitive(var2)) {
                        return primitives_.equalValues(var1, var2);
                } else if (Pointers.isPointer(var1) && Pointers.isPointer(var2)) {
                        throw new UnsupportedOperationException(
                                        "Pointer comparison not yet implemented");
                }
                return false;
        }

        public void readFrame(String frameNameVar, String frameVar,
                        String successVar) throws Exception {
                // Get the values to be set
                String frameName = primitives_.getStringValue(frameNameVar);
                Frame currentFrame = FrameIO.LoadFrame(frameName);

                pointers_.setObject(frameVar, currentFrame);

                if (successVar != null) {
                        Boolean success = currentFrame != null;
                        primitives_.setValue(successVar, new SBoolean(success));
                }
        }

        public void createFrame(String framesetNameVar, String frameVar,
                        String successVar) throws Exception {
                // Get the values to be set
                String framesetName = primitives_.getStringValue(framesetNameVar);
                Frame currentFrame = FrameIO.CreateFrame(framesetName, "", null);
                pointers_.setObject(frameVar, currentFrame);

                if (successVar != null) {
                        Boolean success = currentFrame != null;
                        primitives_.setValue(successVar, new SBoolean(success));
                }
        }

        public void closeFrame(String frameVar, String successVar) throws Exception {
                // Get the values to be set
                Frame frame = (Frame) pointers_.getVariable(frameVar).getValue();
                String contents = FrameIO.SaveFrame(frame, false);

                if (successVar != null) {
                        Boolean success = contents != null;
                        primitives_.setValue(successVar, new SBoolean(success));
                }
        }

        public void closeWriteFile(String fileVar) throws Exception {
                BufferedWriter bw = (BufferedWriter) pointers_.getVariable(fileVar)
                                .getValue();
                bw.close();
        }

        public void writeFile(String fileVar, String text) throws Exception {
                BufferedWriter bw = (BufferedWriter) pointers_.getVariable(fileVar)
                                .getValue();
                bw.write(text);
        }

        public void openWriteFile(String fileNameVar, String fileVar)
                        throws Exception {
                openWriteFile(fileNameVar, fileVar, null);
        }

        public void openWriteFile(String fileNameVar, String fileVar,
                        String successVar) throws Exception {
                // Get the values to be set
                File filePath = new File(primitives_.getStringValue(fileNameVar));
                BufferedWriter currentFile = new BufferedWriter(
                                new FileWriter(filePath));

                pointers_.setObject(fileVar, currentFile);

                if (successVar != null) {
                        Boolean success = currentFile != null;
                        primitives_.setValue(successVar, new SBoolean(success));
                }
        }

        public boolean isDefined(String varName) {
                try {
                        if (Primitives.isPrimitive(varName)) {
                                getPrimitives().getVariable(varName);
                        } else {
                                getPointers().getVariable(varName);
                        }
                        return true;
                } catch (Exception e) {
                        return false;
                }
        }
}