From 746f3241ec5ba8ba58402f04868286d6a4882ae0 Mon Sep 17 00:00:00 2001 From: Nick Burch Date: Wed, 14 Apr 2010 14:01:38 +0000 Subject: [PATCH] Remove readme about java 1.4 vs 1.5, as we've ditched java 1.4 support git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@933958 13f79535-47bb-0310-9956-ffa450edef68 --- src/ooxml/README.interfaces | 44 ------------------------------------- 1 file changed, 44 deletions(-) delete mode 100644 src/ooxml/README.interfaces diff --git a/src/ooxml/README.interfaces b/src/ooxml/README.interfaces deleted file mode 100644 index 0b9e0bea3c..0000000000 --- a/src/ooxml/README.interfaces +++ /dev/null @@ -1,44 +0,0 @@ - Fun with Interfaces - ------------------- - -Let us consider a simple case - - public Interface IFoo {} - public Interface IBar { - public IFoo getFoo(); - } - - public class RealFoo implements IFoo {} - public class RealBar implements IBar { - public RealFoo getFoo() { return new RealFoo(); } - } - -Looks ok, doesn't it? If you access RealBar directly, you get back a -RealFoo. If you access RealBar via the IBar interface, you get back a -IFoo object instead. All looks good. - -Only snag - this doesn't work with any JDK older than 1.5. If you're on -JDK 1.3 or JDK 1.4, you will get a compile time error about incompatible -return signatures. - - -At the moment, we're still committed to having the core of POI work on -JDK 1.3 / JDK 1.4. If you want the OOXML support, then you need to move -to JDK 1.5. This allows us a sort of work-around for the problems: - -JDK 1.3 / JDK 1.4: - You can't use the OOXML stuff anyway, so you probably don't care about - the new interfaces - So, have the existing code (hssf) compile against dummy interfaces, which - don't actually provide any methods - You can't then use the interfaces, but you probably didn't want to anyway - These live in src/ooxml/interfaces-jdk14 - -JDK 1.5: - Compile the existing code (hssf) against full interfaces. Users can still - use the concrete HSSF classes if they want, or if they use the interfaces, - their code will work with the ooxml support too - Need to change any methods that take a concrete object (eg HSSFCell) to - take the interface (eg Cell), and cast, otherwise they're not compatible - with the interface contract (which specifies Cell not HSSFCell). - These live in src/ooxml/interfaces-jdk15