com.google.gwt.core.linker

Class CrossSiteIframeLinker

java.lang.Object

com.google.gwt.core.ext.Linker

com.google.gwt.core.ext.linker.AbstractLinker

com.google.gwt.core.ext.linker.impl.SelectionScriptLinker

com.google.gwt.core.linker.CrossSiteIframeLinker

Direct Known Subclasses:

DirectInstallLinker

@LinkerOrder(value=PRIMARY)
 @Shardable
public class CrossSiteIframeLinker
extends com.google.gwt.core.ext.linker.impl.SelectionScriptLinker

This linker uses an iframe to hold the code and a script tag to download the code. It can download code cross-site, because it uses a script tag to download it and because it never uses XHR. The iframe, meanwhile, makes it trivial to install additional code as the app runs.

Field Summary

Fields inherited from class com.google.gwt.core.ext.linker.impl.SelectionScriptLinker

COMPUTE_SCRIPT_BASE_JS, FRAGMENT_EXTENSION, FRAGMENT_SUBDIR, permutationsUtil, PROCESS_METAS_JS, USE_SOURCE_MAPS_PROPERTY

Constructor Summary

Constructors

Constructor and Description
CrossSiteIframeLinker()

Method Summary

Modifier and Type	Method and Description
protected java.lang.String	fillSelectionScriptTemplate(java.lang.StringBuffer ss, TreeLogger logger, LinkerContext context, ArtifactSet artifacts, CompilationResult result) Generate a selection script.
protected boolean	getBooleanConfigurationProperty(LinkerContext context, java.lang.String name, boolean def)
protected java.lang.String	getCompilationExtension(TreeLogger logger, LinkerContext context)
protected java.lang.String	getDeferredFragmentSuffix2(TreeLogger logger, LinkerContext context, int fragment, java.lang.String strongName) Returns the suffix at the end of a JavaScript fragment other than the initial fragment.
java.lang.String	getDescription() Returns a human-readable String describing the Linker.
protected java.lang.String	getHostedFilename()
protected java.lang.String	getHostedFilenameFull(LinkerContext context)
protected java.lang.String	getJsComputeScriptBase(LinkerContext context) Returns the name of the ComputeScriptBase script.
protected java.lang.String	getJsComputeUrlForResource(LinkerContext context) Returns the name of the UrlForResource script.
protected java.lang.String	getJsDevModeRedirectHook(LinkerContext context) Returns a JavaScript fragment that starts Super Dev Mode, if enabled.
protected java.lang.String	getJsDevModeRedirectHookPermitted(LinkerContext context) Returns a JavaScript expression that determines whether Super Dev Mode may be turned on for the current page.
protected java.lang.String	getJsDevModeUrlValidation(LinkerContext context) Returns a JavaScript fragment that validates "devModeUrl"—the URL that Super Dev Mode's JavaScript is loaded from—before it's used.
protected java.lang.String	getJsInstallLocation(LinkerContext context) Returns the name of the JsInstallLocation script.
protected java.lang.String	getJsInstallScript(LinkerContext context) Returns the name of the JsInstallScript script.
protected java.lang.String	getJsIsBodyLoaded(LinkerContext context) Returns the name of the JsIsBodyLoaded script.
protected java.lang.String	getJsLoadExternalStylesheets(LinkerContext context) Returns the name of the JsLoadExternalStylesheets script.
protected java.lang.String	getJsModuleFunctionErrorCatch(LinkerContext context) Returns the name of the JsModuleFunctionErrorCatch script.
protected java.lang.String	getJsPermutations(LinkerContext context) Returns the name of the JsPermutations script.
protected java.lang.String	getJsProcessMetas(LinkerContext context) Returns the name of the JsProcessMetas script.
protected java.lang.String	getJsProperties(LinkerContext context) Returns the name of the JsProperties script.
protected java.lang.String	getJsRunAsync(LinkerContext context) Returns the name of the JsRunAsync script.
protected java.lang.String	getJsWaitForBodyLoaded(LinkerContext context) Returns the name of the JsWaitForBodyLoaded script.
protected java.lang.String	getModulePrefix(TreeLogger logger, LinkerContext context, java.lang.String strongName) Compute the beginning of a JavaScript file that will hold the main module implementation.
protected java.lang.String	getModuleSuffix2(TreeLogger logger, LinkerContext context, java.lang.String strongName) Returns the suffix for the initial JavaScript fragment.
protected java.lang.String	getScriptChunkSeparator(TreeLogger logger, LinkerContext context) Some subclasses support "chunking" of the primary fragment.
protected java.lang.String	getSelectionScriptTemplate(TreeLogger logger, LinkerContext context)
protected java.lang.String	getSourceMapUrl(LinkerContext context, java.lang.String strongName, int fragmentId) Returns the sourcemap URL that will be put in the comment at the end of a JavaScript fragment, or null if the comment should be omitted.
protected java.lang.String	getStringConfigurationProperty(LinkerContext context, java.lang.String name, java.lang.String def)
protected void	includeJs(java.lang.StringBuffer selectionScript, TreeLogger logger, java.lang.String jsSource, java.lang.String templateVar)
protected void	maybeAddHostedModeFile(TreeLogger logger, LinkerContext context, ArtifactSet artifacts, CompilationResult result) Add the Development Mode file to the artifact set.
protected void	maybeOutputPropertyMap(TreeLogger logger, LinkerContext context, ArtifactSet toReturn)
protected boolean	shouldIncludeBootstrapInPrimaryFragment(LinkerContext context)
protected boolean	shouldInstallCode(LinkerContext context) Determines the strategy for installing JavaScript code into the iframe.
protected boolean	shouldUseSelfForWindowAndDocument(LinkerContext context) Returns whether to use "self" for $wnd and $doc references.
protected java.lang.String	wrapDeferredFragment(TreeLogger logger, LinkerContext context, int fragment, java.lang.String js, ArtifactSet artifacts)
protected java.lang.String	wrapPrimaryFragment(TreeLogger logger, LinkerContext context, java.lang.String script, ArtifactSet artifacts, CompilationResult result)

Methods inherited from class com.google.gwt.core.ext.linker.impl.SelectionScriptLinker

charsPerChunk, doEmitCompilation, emitSelectionInformation, emitSelectionScript, generateDeferredFragment, generatePrimaryFragment, generatePrimaryFragmentString, generateSelectionScript, generateSelectionScript, getDeferredFragmentPrefix, getFragmentSubdir, getModulePrefix, link, link, readFileToStringBuffer, replaceAll, splitPrimaryJavaScript, supportsDevModeInJunit

Methods inherited from class com.google.gwt.core.ext.linker.AbstractLinker

emitBytes, emitBytes, emitInputStream, emitInputStream, emitString, emitString, emitWithStrongName, emitWithStrongName

Methods inherited from class com.google.gwt.core.ext.Linker

isShardable, relink

Methods inherited from class java.lang.Object

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

Constructor Detail

CrossSiteIframeLinker

public CrossSiteIframeLinker()

Method Detail

getDescription

public java.lang.String getDescription()

Description copied from class: Linker

Returns a human-readable String describing the Linker.

Specified by:

getDescription in class Linker

fillSelectionScriptTemplate

protected java.lang.String fillSelectionScriptTemplate(java.lang.StringBuffer ss,
                                                       TreeLogger logger,
                                                       LinkerContext context,
                                                       ArtifactSet artifacts,
                                                       CompilationResult result)
                                                throws UnableToCompleteException

Description copied from class: com.google.gwt.core.ext.linker.impl.SelectionScriptLinker

Generate a selection script. The selection information should previously have been scanned using PermutationsUtil.setupPermutationsMap(ArtifactSet).

Overrides:

fillSelectionScriptTemplate in class com.google.gwt.core.ext.linker.impl.SelectionScriptLinker

Throws:

UnableToCompleteException

getBooleanConfigurationProperty

protected boolean getBooleanConfigurationProperty(LinkerContext context,
                                                  java.lang.String name,
                                                  boolean def)

getCompilationExtension

protected java.lang.String getCompilationExtension(TreeLogger logger,
                                                   LinkerContext context)

Specified by:

getCompilationExtension in class com.google.gwt.core.ext.linker.impl.SelectionScriptLinker

getDeferredFragmentSuffix2

protected java.lang.String getDeferredFragmentSuffix2(TreeLogger logger,
                                                      LinkerContext context,
                                                      int fragment,
                                                      java.lang.String strongName)

Description copied from class: com.google.gwt.core.ext.linker.impl.SelectionScriptLinker

Returns the suffix at the end of a JavaScript fragment other than the initial fragment.

Overrides:

getDeferredFragmentSuffix2 in class com.google.gwt.core.ext.linker.impl.SelectionScriptLinker

getHostedFilename

protected java.lang.String getHostedFilename()

Overrides:

getHostedFilename in class com.google.gwt.core.ext.linker.impl.SelectionScriptLinker

getHostedFilenameFull

protected java.lang.String getHostedFilenameFull(LinkerContext context)

getJsComputeScriptBase

protected java.lang.String getJsComputeScriptBase(LinkerContext context)

Returns the name of the ComputeScriptBase script. By default, returns "com/google/gwt/core/ext/linker/impl/computeScriptBase.js".

Parameters:

context - a LinkerContext

getJsComputeUrlForResource

protected java.lang.String getJsComputeUrlForResource(LinkerContext context)

Returns the name of the UrlForResource script. By default, returns "com/google/gwt/core/ext/linker/impl/computeUrlForResource.js".

Parameters:

context - a LinkerContext

getJsDevModeRedirectHook

protected java.lang.String getJsDevModeRedirectHook(LinkerContext context)

Returns a JavaScript fragment that starts Super Dev Mode, if enabled. (May return either the JavaScript itself or the name of a Java resource ending with ".js".)

getJsDevModeUrlValidation

protected java.lang.String getJsDevModeUrlValidation(LinkerContext context)

Returns a JavaScript fragment that validates "devModeUrl"—the URL that Super Dev Mode's JavaScript is loaded from—before it's used. The variable may be modified to change what what URL is loaded, or it maybe be set to "" to disable completely. (May return either the JavaScript itself or the name of a Java resource ending with ".js".)

getJsDevModeRedirectHookPermitted

protected java.lang.String getJsDevModeRedirectHookPermitted(LinkerContext context)

Returns a JavaScript expression that determines whether Super Dev Mode may be turned on for the current page. (May return either the JavaScript itself or the name of a Java resource ending with ".js".)

The default implementation allows Super Dev Mode only on http: and file: pages. It could be overridden to implement a blacklist or whitelist of hostnames where Super Dev Mode may run. As a safety precaution, it's recommended to return false for https and for the hostnames in URL's visited by end users.

If you override this method to allow https, it probably won't work anyway because browsers often disallow loading JavaScript from http URL's into https pages. To make it work, you will also have to find a way to run the code server using https.

getJsInstallLocation

protected java.lang.String getJsInstallLocation(LinkerContext context)

Returns the name of the JsInstallLocation script. By default, returns "com/google/gwt/core/ext/linker/impl/installLocationIframe.js".

Parameters:

context - a LinkerContext

getJsInstallScript

protected java.lang.String getJsInstallScript(LinkerContext context)

Returns the name of the JsInstallScript script. The default is chosen based on the value of shouldInstallCode(com.google.gwt.core.ext.LinkerContext).

If you override this, verify that shouldInstallCode(com.google.gwt.core.ext.LinkerContext) is set consistently or fragment loading won't work.

getJsIsBodyLoaded

protected java.lang.String getJsIsBodyLoaded(LinkerContext context)

Returns the name of the JsIsBodyLoaded script. By default, returns "com/google/gwt/core/ext/linker/impl/isBodyLoaded.js".

Parameters:

context - a LinkerContext

getJsLoadExternalStylesheets

protected java.lang.String getJsLoadExternalStylesheets(LinkerContext context)

Returns the name of the JsLoadExternalStylesheets script. By default, returns "com/google/gwt/core/ext/linker/impl/loadExternalStylesheets.js".

Parameters:

context - a LinkerContext

getJsModuleFunctionErrorCatch

protected java.lang.String getJsModuleFunctionErrorCatch(LinkerContext context)

Returns the name of the JsModuleFunctionErrorCatch script. By default returns null. This script executes if there's an error loading the module function or executing it. The error will be available under a local variable named "moduleError". If non-null, the module function and the call to the module function will be placed in a try/catch block.

Parameters:

context - a LinkerContext

getJsPermutations

protected java.lang.String getJsPermutations(LinkerContext context)

Returns the name of the JsPermutations script. By default, returns "com/google/gwt/core/ext/linker/impl/permutations.js".

Parameters:

context - a LinkerContext

getJsProcessMetas

protected java.lang.String getJsProcessMetas(LinkerContext context)

Returns the name of the JsProcessMetas script. By default, returns "com/google/gwt/core/ext/linker/impl/processMetas.js".

Parameters:

context - a LinkerContext

getJsProperties

protected java.lang.String getJsProperties(LinkerContext context)

Returns the name of the JsProperties script. By default, returns "com/google/gwt/core/ext/linker/impl/properties.js".

Parameters:

context - a LinkerContext

getJsRunAsync

protected java.lang.String getJsRunAsync(LinkerContext context)

Returns the name of the JsRunAsync script. By default, returns "com/google/gwt/core/ext/linker/impl/runAsync.js".

Parameters:

context - a LinkerContext

getJsWaitForBodyLoaded

protected java.lang.String getJsWaitForBodyLoaded(LinkerContext context)

Returns the name of the JsWaitForBodyLoaded script. By default, returns "com/google/gwt/core/ext/linker/impl/waitForBodyLoaded.js".

Parameters:

context - a LinkerContext

getModulePrefix

protected java.lang.String getModulePrefix(TreeLogger logger,
                                           LinkerContext context,
                                           java.lang.String strongName)
                                    throws UnableToCompleteException

Description copied from class: com.google.gwt.core.ext.linker.impl.SelectionScriptLinker

Compute the beginning of a JavaScript file that will hold the main module implementation.

Specified by:

getModulePrefix in class com.google.gwt.core.ext.linker.impl.SelectionScriptLinker

Throws:

UnableToCompleteException

getModuleSuffix2

protected java.lang.String getModuleSuffix2(TreeLogger logger,
                                            LinkerContext context,
                                            java.lang.String strongName)

Description copied from class: com.google.gwt.core.ext.linker.impl.SelectionScriptLinker

Returns the suffix for the initial JavaScript fragment.

Overrides:

getModuleSuffix2 in class com.google.gwt.core.ext.linker.impl.SelectionScriptLinker

getScriptChunkSeparator

protected java.lang.String getScriptChunkSeparator(TreeLogger logger,
                                                   LinkerContext context)

Description copied from class: com.google.gwt.core.ext.linker.impl.SelectionScriptLinker

Some subclasses support "chunking" of the primary fragment. If chunking will be supported, this function should be overridden to return the string which should be inserted between each chunk.

Overrides:

getScriptChunkSeparator in class com.google.gwt.core.ext.linker.impl.SelectionScriptLinker

getSelectionScriptTemplate

protected java.lang.String getSelectionScriptTemplate(TreeLogger logger,
                                                      LinkerContext context)

Specified by:

getSelectionScriptTemplate in class com.google.gwt.core.ext.linker.impl.SelectionScriptLinker

getSourceMapUrl

protected java.lang.String getSourceMapUrl(LinkerContext context,
                                           java.lang.String strongName,
                                           int fragmentId)

Returns the sourcemap URL that will be put in the comment at the end of a JavaScript fragment, or null if the comment should be omitted. The default implementation uses the includeSourceMapUrl config property.

getStringConfigurationProperty

protected java.lang.String getStringConfigurationProperty(LinkerContext context,
                                                          java.lang.String name,
                                                          java.lang.String def)

includeJs

protected void includeJs(java.lang.StringBuffer selectionScript,
                         TreeLogger logger,
                         java.lang.String jsSource,
                         java.lang.String templateVar)
                  throws UnableToCompleteException

Throws:

UnableToCompleteException

maybeAddHostedModeFile

protected void maybeAddHostedModeFile(TreeLogger logger,
                                      LinkerContext context,
                                      ArtifactSet artifacts,
                                      CompilationResult result)
                               throws UnableToCompleteException

Description copied from class: com.google.gwt.core.ext.linker.impl.SelectionScriptLinker

Add the Development Mode file to the artifact set.

Overrides:

maybeAddHostedModeFile in class com.google.gwt.core.ext.linker.impl.SelectionScriptLinker

Throws:

UnableToCompleteException

maybeOutputPropertyMap

protected void maybeOutputPropertyMap(TreeLogger logger,
                                      LinkerContext context,
                                      ArtifactSet toReturn)

Overrides:

maybeOutputPropertyMap in class com.google.gwt.core.ext.linker.impl.SelectionScriptLinker

shouldIncludeBootstrapInPrimaryFragment

protected boolean shouldIncludeBootstrapInPrimaryFragment(LinkerContext context)

shouldInstallCode

protected boolean shouldInstallCode(LinkerContext context)

Determines the strategy for installing JavaScript code into the iframe. If set to false, a <script> tag pointing to the js file is added directly to the iframe. Otherwise, GWT downloads the JavaScript code as a list of strings and then adds it to the iframe.

shouldUseSelfForWindowAndDocument

protected boolean shouldUseSelfForWindowAndDocument(LinkerContext context)

Returns whether to use "self" for $wnd and $doc references. Defaults to false. Useful for worker threads.

wrapDeferredFragment

protected java.lang.String wrapDeferredFragment(TreeLogger logger,
                                                LinkerContext context,
                                                int fragment,
                                                java.lang.String js,
                                                ArtifactSet artifacts)

Overrides:

wrapDeferredFragment in class com.google.gwt.core.ext.linker.impl.SelectionScriptLinker

wrapPrimaryFragment

protected java.lang.String wrapPrimaryFragment(TreeLogger logger,
                                               LinkerContext context,
                                               java.lang.String script,
                                               ArtifactSet artifacts,
                                               CompilationResult result)
                                        throws UnableToCompleteException

Overrides:

wrapPrimaryFragment in class com.google.gwt.core.ext.linker.impl.SelectionScriptLinker

Throws:

UnableToCompleteException