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145 lines
4.7 KiB
Plaintext
145 lines
4.7 KiB
Plaintext
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Sources
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=======
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The sources are located in mozilla/java/dom.
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Subdirectories
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classes
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jni
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src
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tests
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contain Java sources, Java native methods implementation,
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native c++ code and Java DOM API tests respectively.
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Building
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========
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Requirenments:
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--------------
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Current mozilla build
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JDK1.2 or JDK1.3
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Perl 5 must be in your path
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JDKHOME environment variable set to your JDK dir
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CLASSPATH environment cvariable set to contain
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org.w3c.dom classes. The sources can be found at
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http://www.w3.org/TR/2000/CR-DOM-Level-2-20000307/java-binding.html
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and the binaries can be found at http://www.mozilla.org/projects/blackwood/webclient/bin/m3/dom2-20000307.jar
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Solaris specific
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----------------
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Add following directories to LD_LIBRARY_PATH environment variable:
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$MOZILLA_FIVE_HOME
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$JDKHOME/jre/lib/$HOSTTYPE/native_threads
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$JDKHOME/jre/lib/$HOSTTYPE/classic
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$JDKHOME/jre/lib/$HOSTTYPE/
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goto mozilla/java/dom directory and type "gmake"
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Windows NT specific
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-------------------
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To enable OJI usage set environment variable JAVA_DOM_OJI_ENABLE=1
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Add following directories to PATH environment variable:
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%MOZILLA_FIVE_HOME%
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%JDKHOME%\jre\bin\classic (only in case you don't use OJI)
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goto mozilla/java/dom directory and type "nmake /f makefile.win"
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Using the Java DOM API
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======================
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A Java component obtains a org.w3c.dom.Document by registering for
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Document load notifications. The Document is passed in along with the
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notifications. The preferred way for a Java component to register for
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Document load notifications is to register via the DOMAccessor class.
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However, this is possible only if OJI usage is enabled. This works
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on Windows NT platform.
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On Solaris currently the nsJavaDOM component instantiates its own JVM.
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When an OJI-compatible JVM is available, we will move over to using it.
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So, one has to apply two patches to
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mozilla/webshell/src/nsWebShell.cpp
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mozilla/java/dom/classes/org/mozilla/dom/DOMAccessor.java
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They can be found at mozilla/java/dom directory.
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The first one inits nsJavaDOM component and adds it as a
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document load observer listener.
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The second one registers a document load listener via DOMAccessor.
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Note:
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any class that implements the DocumentLoadListener interface may
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stand for GenericDocLoadListener.
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After applying a patch to nsWebShell.cpp edit
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mozilla/webshell/src/Makefile.in to add -DJAVA_DOM to the list of
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defines. Then do a gmake in this directory.
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After applying a patch to DOMAccessor.java go to mozilla/java/dom/classes
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and do a gmake. No changes in makefiles are needed.
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You can find examples of Java DOM API usage in
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mozilla/java/dom/classes/org/mozilla/dom/util
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mozilla/java/dom/tests/src/applets
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DOM2 events
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------------
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At the moment all DOM2 event-related interfaces are present
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however they are not fully implemented yet
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because Mozilla's core DOM does not support DOM2 events fully.
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Consequences:
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- some methods throws OperationUnsupportedException()
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The basic implementation architecture is following:
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- NodeImpl is extended to support EventTarget interface
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- for every addEventListener call special NativeDOMProxyListener object is
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created and is registered with Mozilla's DOM
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It's task is to propagate event notifications from Mozilla's DOM
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to target Java EventListener
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- In order to sucessfully unregister EventListeners we need to
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save association between java EventListener and corresponding
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NativeDOMProxyListener object. This is done by storing such
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associations Vector at NodeImpl
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- javaDOMEventsGlobals class is used much like javaDOMGlobals for caching
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(this code may be moved to javaDOMGlobals)
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NSPR Logging
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------------
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The NSPR Log module name is javadom. For instructions on how to enable
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logging, see dist/include/prlog.h
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Debug output
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------------
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The debug build of the Java DOM API creates the JVM with the verbose
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and the verboseGC options turned on, to help in debugging. It also
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creates two files in the current working directory, dom-java.txt and
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dom-cpp.txt, which are simple dumps of the DOM, as printed from C++
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and from Java. The two should be identical. The code to write these
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files is, essentially, my regression test. Feel free to add to it.
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Dependencies
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------------
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Currently tested on Solaris 7 only with Java 2 SDK 1.2.1. egcs-2.91.66,
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Sun Workshop C++ 4.2 and 5.0 have been know to compile this code
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fine. gcc-2.8.1 does *not* work. I have not used anything
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Java2-specific, and it works with JDK1.1.x too (I have been using JDK
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1.1.6 too).
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References
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----------
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I highly recommend reading Sheng Liang's new JNI book.
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