DynamicSectionOutputBuffer.java

public class DynamicSectionOutputBuffer implements IOutputBuffer {

	private final StringBuilder buffer = new StringBuilder();
	
	@Override
	public void printdyn(Object o) {
		buffer.append(o);
	}
	
	@Override
	public String toString() {
		return buffer.toString();
	}
	
	
	// We don't need to provide a sensible implementation for the remaining methods
	
	@Override
	public void chop(int numberOfCharacters) {
		// TODO Auto-generated method stub

	}

	@Override
	public void print(Object o) {
		// TODO Auto-generated method stub

	}

	@Override
	public void println() {
		// TODO Auto-generated method stub

	}

	@Override
	public void println(Object o) {
		// TODO Auto-generated method stub

	}

	@Override
	public void prinx(Object o) {
		// TODO Auto-generated method stub

	}

	@Override
	public String getSpaces(int howMany) {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public void setContentType(String name) throws EglRuntimeException {
		// TODO Auto-generated method stub

	}

	@Override
	public String preserve(String id, boolean enabled, String contents)
			throws EglRuntimeException {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public String preserve(String startComment, String endComment, String id,
			boolean enabled, String contents) throws EglRuntimeException {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public String startPreserve(String id, boolean enabled)
			throws EglRuntimeException {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public String startPreserve(String startComment, String endComment,
			String id, boolean enabled) throws EglRuntimeException {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public String stopPreserve() throws EglRuntimeException {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public void stop() throws EglStoppedException {
		// TODO Auto-generated method stub

	}

	@Override
	public int getCurrentLineNumber() {
		// TODO Auto-generated method stub
		return 0;
	}

	@Override
	public int getCurrentColumnNumber() {
		// TODO Auto-generated method stub
		return 0;
	}

	@Override
	public int getOffset() {
		// TODO Auto-generated method stub
		return 0;
	}

	@Override
	public void formatWith(Formatter formatter) {
		// TODO Auto-generated method stub

	}
}

GenerationRule.java

public class GenerationRule {
  
  public void generateAll(IEglContext context, EglTemplateFactory templateFactory, EgxModule module) throws EolRuntimeException {
      	...
      
      	// Store the original OutputBufferFactory so that we can restore it later
	IOutputBufferFactory originalOutputBufferFactory = templateFactory.getContext().getOutputBufferFactory();
			
	// Create our own OutputBufferFactory
	templateFactory.getContext().setOutputBufferFactory(new IOutputBufferFactory() {
				
	// This is the method that EGL now calls to obtain a new IOutputBuffer
	@Override
	public IOutputBuffer create() {
		// Instead of creating the normal EGL OutputBuffer, we create our own
		// implementation of IOutputBuffer which only captures the text emitted
		// by dynamic sections.
		return new DynamicSectionOutputBuffer();
		}
	});
			
	// Create a template that we can use to compute a signature
	EglTemplate signatureTemplate = templateFactory.load(template);
			
	// If present, add the source parameter in the EGX rule to the EGL template
	if (sourceParameter != null) {
		signatureTemplate.populate(sourceParameter.getName(), o);
	}
			
	// Add any parameters specified in the EGX rule to the EGL template
	for (Object key : parameters.keySet()) {
		signatureTemplate.populate(key + "", parameters.get(key));
	}
			
	// Obtain the output from appending only the dynamic sections to the buffer
	String dynamicSectionText = signatureTemplate.process();
	System.err.println(dynamicSectionText);
			
	// Restore the original OutputBufferFactory so that any new templates will
	// use the default EGL OutputBuffer rather than our special OutputBuffer
	templateFactory.getContext().setOutputBufferFactory(originalOutputBufferFactory);
      
      ....
    }
    
}