com.vaadin.server.PaintTarget Maven / Gradle / Ivy
/*
* Vaadin Framework 7
*
* Copyright (C) 2000-2024 Vaadin Ltd
*
* This program is available under Vaadin Commercial License and Service Terms.
*
* See for the full
* license.
*/
package com.vaadin.server;
import java.io.Serializable;
import java.util.Map;
import com.vaadin.server.StreamVariable.StreamingStartEvent;
import com.vaadin.ui.Component;
/**
* This interface defines the methods for painting XML to the UIDL stream.
*
* @author Vaadin Ltd.
* @since 3.0
*/
public interface PaintTarget extends Serializable {
/**
* Prints single XMLsection.
*
* Prints full XML section. The section data is escaped from XML tags and
* surrounded by XML start and end-tags.
*
* @param sectionTagName
* the name of the tag.
* @param sectionData
* the scetion data.
* @throws PaintException
* if the paint operation failed.
*/
public void addSection(String sectionTagName, String sectionData)
throws PaintException;
/**
* Result of starting to paint a Component (
* {@link PaintTarget#startPaintable(Component, String)}).
*
* @since 7.0
*/
public enum PaintStatus {
/**
* Painting started, addVariable() and addAttribute() etc. methods may
* be called.
*/
PAINTING,
/**
* A previously unpainted or painted {@link Component} has been queued
* be created/update later in a separate change in the same set of
* changes.
*/
CACHED
}
/**
* Prints element start tag of a paintable section. Starts a paintable
* section using the given tag. The PaintTarget may implement a caching
* scheme, that checks the paintable has actually changed or can a cached
* version be used instead. This method should call the startTag method.
*
* If the {@link Component} is found in cache and this function returns true
* it may omit the content and close the tag, in which case cached content
* should be used.
*
*
* This method may also add only a reference to the paintable and queue the
* paintable to be painted separately.
*
*
* Each paintable being painted should be closed by a matching
* {@link #endPaintable(Component)} regardless of the {@link PaintStatus}
* returned.
*
*
* @param paintable
* the paintable to start.
* @param tag
* the name of the start tag.
* @return {@link PaintStatus} - ready to paint or already cached on the
* client (also used for sub paintables that are painted later
* separately)
* @throws PaintException
* if the paint operation failed.
* @see #startTag(String)
* @since 7.0 (previously using startTag(Paintable, String))
*/
public PaintStatus startPaintable(Component paintable, String tag)
throws PaintException;
/**
* Prints paintable element end tag.
*
* Calls to {@link #startPaintable(Component, String)}should be matched by
* {@link #endPaintable(Component)}. If the parent tag is closed before
* every child tag is closed a PaintException is raised.
*
* @param paintable
* the paintable to close.
* @throws PaintException
* if the paint operation failed.
* @since 7.0 (previously using engTag(String))
*/
public void endPaintable(Component paintable) throws PaintException;
/**
* Prints element start tag.
*
*
* Todo:
* Checking of input values
*
*
* @param tagName
* the name of the start tag.
* @throws PaintException
* if the paint operation failed.
*/
public void startTag(String tagName) throws PaintException;
/**
* Prints element end tag.
*
* If the parent tag is closed before every child tag is closed an
* PaintException is raised.
*
* @param tagName
* the name of the end tag.
* @throws PaintException
* if the paint operation failed.
*/
public void endTag(String tagName) throws PaintException;
/**
* Adds a boolean attribute to component. Atributes must be added before any
* content is written.
*
* @param name
* the Attribute name.
* @param value
* the Attribute value.
*
* @throws PaintException
* if the paint operation failed.
*/
public void addAttribute(String name, boolean value) throws PaintException;
/**
* Adds a integer attribute to component. Atributes must be added before any
* content is written.
*
* @param name
* the Attribute name.
* @param value
* the Attribute value.
*
* @throws PaintException
* if the paint operation failed.
*/
public void addAttribute(String name, int value) throws PaintException;
/**
* Adds a resource attribute to component. Atributes must be added before
* any content is written.
*
* @param name
* the Attribute name
* @param value
* the Attribute value
*
* @throws PaintException
* if the paint operation failed.
*/
public void addAttribute(String name, Resource value) throws PaintException;
/**
* Adds details about {@link StreamVariable} to the UIDL stream. Eg. in web
* terminals Receivers are typically rendered for the client side as URLs,
* where the client side implementation can do an http post request.
*
* The urls in UIDL message may use Vaadin specific protocol. Before
* actually using the urls on the client side, they should be passed via
* {@link com.vaadin.client.ApplicationConnection#translateVaadinUri(String)}.
*
* Note that in current terminal implementation StreamVariables are cleaned
* from the terminal only when:
*
* - a StreamVariable with same name replaces an old one
*
- the variable owner is no more attached
*
- the developer signals this by calling
* {@link StreamingStartEvent#disposeStreamVariable()}
*
* Most commonly a component developer can just ignore this issue, but with
* strict memory requirements and lots of StreamVariables implementations
* that reserve a lot of memory this may be a critical issue.
*
* @param owner
* the ReceiverOwner that can track the progress of streaming to
* the given StreamVariable
* @param name
* an identifying name for the StreamVariable
* @param value
* the StreamVariable to paint
*
* @throws PaintException
* if the paint operation failed.
*/
public void addVariable(VariableOwner owner, String name,
StreamVariable value) throws PaintException;
/**
* Adds a long attribute to component. Atributes must be added before any
* content is written.
*
* @param name
* the Attribute name.
* @param value
* the Attribute value.
*
* @throws PaintException
* if the paint operation failed.
*/
public void addAttribute(String name, long value) throws PaintException;
/**
* Adds a float attribute to component. Atributes must be added before any
* content is written.
*
* @param name
* the Attribute name.
* @param value
* the Attribute value.
*
* @throws PaintException
* if the paint operation failed.
*/
public void addAttribute(String name, float value) throws PaintException;
/**
* Adds a double attribute to component. Atributes must be added before any
* content is written.
*
* @param name
* the Attribute name.
* @param value
* the Attribute value.
*
* @throws PaintException
* if the paint operation failed.
*/
public void addAttribute(String name, double value) throws PaintException;
/**
* Adds a string attribute to component. Atributes must be added before any
* content is written.
*
* @param name
* the Boolean attribute name.
* @param value
* the Boolean attribute value.
*
* @throws PaintException
* if the paint operation failed.
*/
public void addAttribute(String name, String value) throws PaintException;
/**
* TODO
*
* @param name
* @param value
* @throws PaintException
*/
public void addAttribute(String name, Map value)
throws PaintException;
/**
* Adds a Component type attribute. On client side the value will be a
* terminal specific reference to corresponding component on client side
* implementation.
*
* @param name
* the name of the attribute
* @param value
* the Component to be referenced on client side
* @throws PaintException
*/
public void addAttribute(String name, Component value)
throws PaintException;
/**
* Adds a string type variable.
*
* @param owner
* the Listener for variable changes.
* @param name
* the Variable name.
* @param value
* the Variable initial value.
*
* @throws PaintException
* if the paint operation failed.
*/
public void addVariable(VariableOwner owner, String name, String value)
throws PaintException;
/**
* Adds a int type variable.
*
* @param owner
* the Listener for variable changes.
* @param name
* the Variable name.
* @param value
* the Variable initial value.
*
* @throws PaintException
* if the paint operation failed.
*/
public void addVariable(VariableOwner owner, String name, int value)
throws PaintException;
/**
* Adds a long type variable.
*
* @param owner
* the Listener for variable changes.
* @param name
* the Variable name.
* @param value
* the Variable initial value.
*
* @throws PaintException
* if the paint operation failed.
*/
public void addVariable(VariableOwner owner, String name, long value)
throws PaintException;
/**
* Adds a float type variable.
*
* @param owner
* the Listener for variable changes.
* @param name
* the Variable name.
* @param value
* the Variable initial value.
*
* @throws PaintException
* if the paint operation failed.
*/
public void addVariable(VariableOwner owner, String name, float value)
throws PaintException;
/**
* Adds a double type variable.
*
* @param owner
* the Listener for variable changes.
* @param name
* the Variable name.
* @param value
* the Variable initial value.
*
* @throws PaintException
* if the paint operation failed.
*/
public void addVariable(VariableOwner owner, String name, double value)
throws PaintException;
/**
* Adds a boolean type variable.
*
* @param owner
* the Listener for variable changes.
* @param name
* the Variable name.
* @param value
* the Variable initial value.
*
* @throws PaintException
* if the paint operation failed.
*/
public void addVariable(VariableOwner owner, String name, boolean value)
throws PaintException;
/**
* Adds a string array type variable.
*
* @param owner
* the Listener for variable changes.
* @param name
* the Variable name.
* @param value
* the Variable initial value.
*
* @throws PaintException
* if the paint operation failed.
*/
public void addVariable(VariableOwner owner, String name, String[] value)
throws PaintException;
/**
* Adds a Component type variable. On client side the variable value will be
* a terminal specific reference to corresponding component on client side
* implementation. When updated from client side, terminal will map the
* client side component reference back to a corresponding server side
* reference.
*
* @param owner
* the Listener for variable changes
* @param name
* the name of the variable
* @param value
* the initial value of the variable
*
* @throws PaintException
* if the paint oparation fails
*/
public void addVariable(VariableOwner owner, String name, Component value)
throws PaintException;
/**
* Adds a upload stream type variable.
*
* @param owner
* the Listener for variable changes.
* @param name
* the Variable name.
*
* @throws PaintException
* if the paint operation failed.
*/
public void addUploadStreamVariable(VariableOwner owner, String name)
throws PaintException;
/**
* Prints single XML section.
*
* Prints full XML section. The section data must be XML and it is
* surrounded by XML start and end-tags.
*
*
* @param sectionTagName
* the tag name.
* @param sectionData
* the section data to be printed.
* @param namespace
* the namespace.
* @throws PaintException
* if the paint operation failed.
*/
public void addXMLSection(String sectionTagName, String sectionData,
String namespace) throws PaintException;
/**
* Adds UIDL directly. The UIDL must be valid in accordance with the
* UIDL.dtd
*
* @param uidl
* the UIDL to be added.
* @throws PaintException
* if the paint operation failed.
*/
public void addUIDL(java.lang.String uidl) throws PaintException;
/**
* Adds text node. All the contents of the text are XML-escaped.
*
* @param text
* the Text to add
* @throws PaintException
* if the paint operation failed.
*/
void addText(String text) throws PaintException;
/**
* Adds CDATA node to target UIDL-tree.
*
* @param text
* the Character data to add
* @throws PaintException
* if the paint operation failed.
* @since 3.1
*/
void addCharacterData(String text) throws PaintException;
public void addAttribute(String string, Object[] keys);
/**
* @return the "tag" string used in communication to present given
* {@link ClientConnector} type. Terminal may define how to present
* the connector.
*/
public String getTag(ClientConnector paintable);
/**
* @return true if a full repaint has been requested. E.g. refresh in a
* browser window or such.
*/
public boolean isFullRepaint();
}
© 2015 - 2025 Weber Informatics LLC | Privacy Policy