OutputOperator.java

// Copyright 2001-2004, FreeHEP.
package org.freehep.postscript;

/**
 * Device Setup and Output Operators for PostScript Processor
 *
 * @author Mark Donszelmann
 * @version $Id: OutputOperator.java 8958 2006-09-12 23:37:43Z duns $
 */
public class OutputOperator extends PSOperator {
    
    public static Class[] operators = {
        ShowPage.class, CopyPage.class, 
        SetPageDevice.class, CurrentPageDevice.class, NullDevice.class
    };

    public boolean execute(OperandStack os) {
        throw new RuntimeException("Cannot execute class: "+getClass());
    }
}

class ShowPage extends OutputOperator {

    public boolean execute(OperandStack os) {
        Object showPage = os.execStack().pop();
        os.execStack().push(new InitGraphics());
        os.execStack().push(new ErasePage());
        os.execStack().push(showPage);
        return true;
    }
}

class CopyPage extends OutputOperator {

    public boolean execute(OperandStack os) {
        // no-op
        return true;
    }
}

class SetPageDevice extends OutputOperator {
    { operandTypes = new Class[] {PSDictionary.class}; }

    public boolean execute(OperandStack os) {
        // FIXME
        error(os, new Unimplemented());
        return true;
    }
}

class CurrentPageDevice extends OutputOperator {

    public boolean execute(OperandStack os) {
        // FIXME
        error(os, new Unimplemented());
        return true;
    }
}

class NullDevice extends OutputOperator {

    public boolean execute(OperandStack os) {
        // no-op
        return true;
    }
}