com.vaadin.terminal.gwt.server
Class JsonPaintTarget

java.lang.Object
  com.vaadin.terminal.gwt.server.JsonPaintTarget

All Implemented Interfaces:

PaintTarget, Serializable

public class JsonPaintTarget
extends Object
implements PaintTarget

User Interface Description Language Target. TODO document better: role of this class, UIDL format, attributes, variables, etc.

Since:

5.0

Version:

6.8.18

Author:

Vaadin Ltd.

See Also:

Serialized Form

Constructor Summary

JsonPaintTarget(AbstractCommunicationManager manager, PrintWriter outWriter, boolean cachingRequired)
Creates a new XMLPrintWriter, without automatic line flushing.

Method Summary

void	addAttribute(String name, boolean value) Adds a boolean attribute to component.
void	addAttribute(String name, double value) Adds a double attribute to component.
void	addAttribute(String name, float value) Adds a float attribute to component.
void	addAttribute(String name, int value) Adds a integer attribute to component.
void	addAttribute(String name, long value) Adds a long attribute to component.
void	addAttribute(String name, Map<?,?> value) TODO
void	addAttribute(String name, Object[] values)
void	addAttribute(String name, Paintable value) Adds a Paintable type attribute.
void	addAttribute(String name, Resource value) Adds a resource attribute to component.
void	addAttribute(String name, String value) Adds a string attribute to component.
void	addCharacterData(String text) Adds CDATA node to target UIDL-tree.
void	addSection(String sectionTagName, String sectionData) Prints the single text section.
void	addText(String str) Prints XML-escaped text.
void	addUIDL(String xml) Adds XML directly to UIDL.
void	addUploadStreamVariable(VariableOwner owner, String name) Adds a upload stream type variable.
void	addVariable(VariableOwner owner, String name, boolean value) Adds a boolean type variable.
void	addVariable(VariableOwner owner, String name, double value) Adds a double type variable.
void	addVariable(VariableOwner owner, String name, float value) Adds a float type variable.
void	addVariable(VariableOwner owner, String name, int value) Adds a int type variable.
void	addVariable(VariableOwner owner, String name, long value) Adds a long type variable.
void	addVariable(VariableOwner owner, String name, Paintable value) Adds a Paintable type variable.
void	addVariable(VariableOwner owner, String name, StreamVariable value) Adds details about StreamVariable to the UIDL stream.
void	addVariable(VariableOwner owner, String name, String value) Adds a string type variable.
void	addVariable(VariableOwner owner, String name, String[] value) Adds a string array type variable.
void	addXMLSection(String sectionTagName, String sectionData, String namespace) Adds XML section with namespace.
void	close() Closes the paint target.
void	endTag(String tagName) Prints the element end tag.
static String	escapeJSON(String s) Escapes the given string so it can safely be used as a JSON string.
static String	escapeXML(String xml) Substitutes the XML sensitive characters with predefined XML entities.
String	getPaintIdentifier(Paintable paintable)
String	getTag(Paintable paintable)
String	getUIDL() Gets the UIDL already printed to stream.
Set<Object>	getUsedResources()
boolean	isFullRepaint()
boolean	needsToBePainted(Paintable p) Method to check if paintable is already painted into this target.
void	paintReference(Paintable paintable, String referenceName) Deprecated.
boolean	startTag(Paintable paintable, String tagName) Prints element start tag of a paintable section.
void	startTag(String tagName) Prints element start tag.
void	startTag(String tagName, boolean isChildNode) Prints the element start tag.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

JsonPaintTarget

public JsonPaintTarget(AbstractCommunicationManager manager,
                       PrintWriter outWriter,
                       boolean cachingRequired)
                throws PaintException

Creates a new XMLPrintWriter, without automatic line flushing.

Parameters:

variableMap -

manager -

outWriter - A character-output stream.

cachingRequired - true if this is not a full repaint, i.e. caches are to be used.

Throws:

PaintException - if the paint operation failed.

Method Detail

startTag

public void startTag(String tagName)
              throws PaintException

Description copied from interface: PaintTarget

Prints element start tag.

 Todo:
 Checking of input values
 

Specified by:

startTag in interface PaintTarget

Parameters:

tagName - the name of the start tag.

Throws:

PaintException - if the paint operation failed.

startTag

public void startTag(String tagName,
                     boolean isChildNode)
              throws PaintException

Prints the element start tag.

   Todo:
    Checking of input values
 
 

Parameters:

tagName - the name of the start tag.

Throws:

PaintException - if the paint operation failed.

endTag

public void endTag(String tagName)
            throws PaintException

Prints the element end tag. If the parent tag is closed before every child tag is closed an PaintException is raised.

Specified by:

endTag in interface PaintTarget

Parameters:

tag - the name of the end tag.

Throws:

Paintexception - if the paint operation failed.

PaintException - if the paint operation failed.

escapeXML

public static String escapeXML(String xml)

Substitutes the XML sensitive characters with predefined XML entities.

Parameters:

xml - the String to be substituted.

Returns:

A new string instance where all occurrences of XML sensitive characters are substituted with entities.

escapeJSON

public static String escapeJSON(String s)

Escapes the given string so it can safely be used as a JSON string.

Parameters:

s - The string to escape

Returns:

Escaped version of the string

addText

public void addText(String str)
             throws PaintException

Prints XML-escaped text.

Specified by:

addText in interface PaintTarget

Parameters:

str -

Throws:

PaintException - if the paint operation failed.

addAttribute

public void addAttribute(String name,
                         boolean value)
                  throws PaintException

Description copied from interface: PaintTarget

Adds a boolean attribute to component. Atributes must be added before any content is written.

Specified by:

addAttribute in interface PaintTarget

Parameters:

name - the Attribute name.

value - the Attribute value.

Throws:

PaintException - if the paint operation failed.

addAttribute

public void addAttribute(String name,
                         Resource value)
                  throws PaintException

Description copied from interface: PaintTarget

Adds a resource attribute to component. Atributes must be added before any content is written.

Specified by:

addAttribute in interface PaintTarget

Parameters:

name - the Attribute name

value - the Attribute value

Throws:

PaintException - if the paint operation failed.

addAttribute

public void addAttribute(String name,
                         int value)
                  throws PaintException

Description copied from interface: PaintTarget

Adds a integer attribute to component. Atributes must be added before any content is written.

Specified by:

addAttribute in interface PaintTarget

Parameters:

name - the Attribute name.

value - the Attribute value.

Throws:

PaintException - if the paint operation failed.

addAttribute

public void addAttribute(String name,
                         long value)
                  throws PaintException

Description copied from interface: PaintTarget

Adds a long attribute to component. Atributes must be added before any content is written.

Specified by:

addAttribute in interface PaintTarget

Parameters:

name - the Attribute name.

value - the Attribute value.

Throws:

PaintException - if the paint operation failed.

addAttribute

public void addAttribute(String name,
                         float value)
                  throws PaintException

Description copied from interface: PaintTarget

Adds a float attribute to component. Atributes must be added before any content is written.

Specified by:

addAttribute in interface PaintTarget

Parameters:

name - the Attribute name.

value - the Attribute value.

Throws:

PaintException - if the paint operation failed.

addAttribute

public void addAttribute(String name,
                         double value)
                  throws PaintException

Description copied from interface: PaintTarget

Adds a double attribute to component. Atributes must be added before any content is written.

Specified by:

addAttribute in interface PaintTarget

Parameters:

name - the Attribute name.

value - the Attribute value.

Throws:

PaintException - if the paint operation failed.

addAttribute

public void addAttribute(String name,
                         String value)
                  throws PaintException

Description copied from interface: PaintTarget

Adds a string attribute to component. Atributes must be added before any content is written.

Specified by:

addAttribute in interface PaintTarget

Parameters:

name - the Boolean attribute name.

value - the Boolean attribute value.

Throws:

PaintException - if the paint operation failed.

addAttribute

public void addAttribute(String name,
                         Paintable value)
                  throws PaintException

Description copied from interface: PaintTarget

Adds a Paintable type attribute. On client side the value will be a terminal specific reference to corresponding component on client side implementation.

Specified by:

addAttribute in interface PaintTarget

Parameters:

name - the name of the attribute

value - the Paintable to be referenced on client side

Throws:

PaintException

addAttribute

public void addAttribute(String name,
                         Map<?,?> value)
                  throws PaintException

Description copied from interface: PaintTarget

TODO

Specified by:

addAttribute in interface PaintTarget

Throws:

PaintException

addAttribute

public void addAttribute(String name,
                         Object[] values)

Specified by:

addAttribute in interface PaintTarget

addVariable

public void addVariable(VariableOwner owner,
                        String name,
                        String value)
                 throws PaintException

Description copied from interface: PaintTarget

Adds a string type variable.

Specified by:

addVariable in interface PaintTarget

Parameters:

owner - the Listener for variable changes.

name - the Variable name.

value - the Variable initial value.

Throws:

PaintException - if the paint operation failed.

addVariable

public void addVariable(VariableOwner owner,
                        String name,
                        Paintable value)
                 throws PaintException

Description copied from interface: PaintTarget

Adds a Paintable 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.

Specified by:

addVariable in interface PaintTarget

Parameters:

owner - the Listener for variable changes

name - the name of the variable

value - the initial value of the variable

Throws:

PaintException - if the paint oparation fails

addVariable

public void addVariable(VariableOwner owner,
                        String name,
                        int value)
                 throws PaintException

Description copied from interface: PaintTarget

Adds a int type variable.

Specified by:

addVariable in interface PaintTarget

Parameters:

owner - the Listener for variable changes.

name - the Variable name.

value - the Variable initial value.

Throws:

PaintException - if the paint operation failed.

addVariable

public void addVariable(VariableOwner owner,
                        String name,
                        long value)
                 throws PaintException

Description copied from interface: PaintTarget

Adds a long type variable.

Specified by:

addVariable in interface PaintTarget

Parameters:

owner - the Listener for variable changes.

name - the Variable name.

value - the Variable initial value.

Throws:

PaintException - if the paint operation failed.

addVariable

public void addVariable(VariableOwner owner,
                        String name,
                        float value)
                 throws PaintException

Description copied from interface: PaintTarget

Adds a float type variable.

Specified by:

addVariable in interface PaintTarget

Parameters:

owner - the Listener for variable changes.

name - the Variable name.

value - the Variable initial value.

Throws:

PaintException - if the paint operation failed.

addVariable

public void addVariable(VariableOwner owner,
                        String name,
                        double value)
                 throws PaintException

Description copied from interface: PaintTarget

Adds a double type variable.

Specified by:

addVariable in interface PaintTarget

Parameters:

owner - the Listener for variable changes.

name - the Variable name.

value - the Variable initial value.

Throws:

PaintException - if the paint operation failed.

addVariable

public void addVariable(VariableOwner owner,
                        String name,
                        boolean value)
                 throws PaintException

Description copied from interface: PaintTarget

Adds a boolean type variable.

Specified by:

addVariable in interface PaintTarget

Parameters:

owner - the Listener for variable changes.

name - the Variable name.

value - the Variable initial value.

Throws:

PaintException - if the paint operation failed.

addVariable

public void addVariable(VariableOwner owner,
                        String name,
                        String[] value)
                 throws PaintException

Description copied from interface: PaintTarget

Adds a string array type variable.

Specified by:

addVariable in interface PaintTarget

Parameters:

owner - the Listener for variable changes.

name - the Variable name.

value - the Variable initial value.

Throws:

PaintException - if the paint operation failed.

addUploadStreamVariable

public void addUploadStreamVariable(VariableOwner owner,
                                    String name)
                             throws PaintException

Adds a upload stream type variable. TODO not converted for JSON

Specified by:

addUploadStreamVariable in interface PaintTarget

Parameters:

owner - the Listener for variable changes.

name - the Variable name.

Throws:

PaintException - if the paint operation failed.

addSection

public void addSection(String sectionTagName,
                       String sectionData)
                throws PaintException

Prints the single text section. Prints full text section. The section data is escaped

Specified by:

addSection in interface PaintTarget

Parameters:

sectionTagName - the name of the tag.

sectionData - the section data to be printed.

Throws:

PaintException - if the paint operation failed.

addUIDL

public void addUIDL(String xml)
             throws PaintException

Adds XML directly to UIDL.

Specified by:

addUIDL in interface PaintTarget

Parameters:

xml - the Xml to be added.

Throws:

PaintException - if the paint operation failed.

addXMLSection

public void addXMLSection(String sectionTagName,
                          String sectionData,
                          String namespace)
                   throws PaintException

Adds XML section with namespace.

Specified by:

addXMLSection in interface PaintTarget

Parameters:

sectionTagName - the name of the tag.

sectionData - the section data.

namespace - the namespace to be added.

Throws:

PaintException - if the paint operation failed.

See Also:

PaintTarget.addXMLSection(String, String, String)

getUIDL

public String getUIDL()

Gets the UIDL already printed to stream. Paint target must be closed before the getUIDL can be called.

Returns:

the UIDL.

close

public void close()
           throws PaintException

Closes the paint target. Paint target must be closed before the getUIDL can be called. Subsequent attempts to write to paint target. If the target was already closed, call to this function is ignored. will generate an exception.

Throws:

PaintException - if the paint operation failed.

startTag

public boolean startTag(Paintable paintable,
                        String tagName)
                 throws PaintException

Description copied from interface: PaintTarget

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 Paintable 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.

Specified by:

startTag in interface PaintTarget

Parameters:

paintable - the paintable to start.

tagName - the name of the start tag.

Returns:

true if paintable found in cache, false otherwise.

Throws:

PaintException - if the paint operation failed.

See Also:

PaintTarget.startTag(String)

paintReference

@Deprecated
public void paintReference(Paintable paintable,
                                      String referenceName)
                    throws PaintException

Deprecated.

Description copied from interface: PaintTarget

Paints a component reference as an attribute to current tag. This method is meant to enable component interactions on client side. With reference the client side component can communicate directly to other component. Note! This was experimental api and got replaced by PaintTarget.addAttribute(String, Paintable) and PaintTarget.addVariable(VariableOwner, String, Paintable).

Specified by:

paintReference in interface PaintTarget

Parameters:

paintable - the Paintable to reference

Throws:

PaintException

getPaintIdentifier

public String getPaintIdentifier(Paintable paintable)
                          throws PaintException

Throws:

PaintException

addCharacterData

public void addCharacterData(String text)
                      throws PaintException

Description copied from interface: PaintTarget

Adds CDATA node to target UIDL-tree.

Specified by:

addCharacterData in interface PaintTarget

Parameters:

text - the Character data to add

Throws:

PaintException - if the paint operation failed.

getUsedResources

public Set<Object> getUsedResources()

needsToBePainted

public boolean needsToBePainted(Paintable p)

Method to check if paintable is already painted into this target.

Parameters:

p -

Returns:

true if is not yet painted into this target and is connected to app

getTag

public String getTag(Paintable paintable)

Specified by:

getTag in interface PaintTarget

Returns:

the "tag" string used in communication to present given Paintable type. Terminal may define how to present paintable.

addVariable

public void addVariable(VariableOwner owner,
                        String name,
                        StreamVariable value)
                 throws PaintException

Description copied from interface: PaintTarget

Adds details about 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 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 StreamVariable.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.

Specified by:

addVariable in interface PaintTarget

Parameters:

owner - the ReceiverOwner that can track the progress of streaming to the given StreamVariable

name - an identifying name for the StreamVariable

value - the StreamVariable to paint

Throws:

PaintException - if the paint operation failed.

isFullRepaint

public boolean isFullRepaint()

Specified by:

isFullRepaint in interface PaintTarget

Returns:

true if a full repaint has been requested. E.g. refresh in a browser window or such.