javax.faces.context.PartialResponseWriter Maven / Gradle / Ivy
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package javax.faces.context;
import java.io.IOException;
import java.util.Map;
import javax.faces.render.ResponseStateManager;
/**
* PartialResponseWriter
* decorates an existing ResponseWriter
to support the
* generation of a partial response suitable for Ajax operations.
* In addition to the markup generation methods inherited from
* javax.faces.context.ResponseWriter
, this class provides
* methods for constructing the standard partial response elements.
*
* @since 2.0
*/
public class PartialResponseWriter extends ResponseWriterWrapper {
// True when we need to close a changes tag
//
private boolean inChanges = false;
// True when we need to close a before insert tag
//
private boolean inInsertBefore = false;
// True when we need to close afer insert tag
//
private boolean inInsertAfter = false;
// True when we need to close an update tag
//
private boolean inUpdate = false;
ResponseWriter writer;
/**
* Reserved ID value to indicate
* entire ViewRoot.
*
* @since 2.0
*/
public static final String RENDER_ALL_MARKER = "javax.faces.ViewRoot";
/**
* Reserved ID value to indicate
* serialized ViewState.
*
* @since 2.0
*/
public static final String VIEW_STATE_MARKER = ResponseStateManager.VIEW_STATE_PARAM;
/**
* Create a PartialResponseWriter
.
*
* @param writer The writer to wrap.
* @since 2.0
*/
public PartialResponseWriter(ResponseWriter writer) {
this.writer = writer;
}
/**
* Return the wrapped
* {@link ResponseWriter} instance.
*
* @see ResponseWriterWrapper#getWrapped()
* @since 2.0
*/
public ResponseWriter getWrapped() {
return writer;
}
/**
* Write the start of a partial response.
*
* @throws IOException if an input/output error occurs
* @since 2.0
*/
public void startDocument() throws IOException {
ResponseWriter writer = getWrapped();
String encoding = writer.getCharacterEncoding( );
if( encoding == null ) {
encoding = "utf-8";
}
writer.writePreamble("\n");
writer.startElement("partial-response", null);
FacesContext ctx = FacesContext.getCurrentInstance();
if (null != ctx && null != ctx.getViewRoot()) {
String id = ctx.getViewRoot().getContainerClientId(ctx);
writer.writeAttribute("id", id, "id");
}
}
/**
* Write the end of a partial response.
*
* @throws IOException if an input/output error occurs
* @since 2.0
*/
public void endDocument() throws IOException {
endChangesIfNecessary();
ResponseWriter writer = getWrapped();
/*
* Because during a