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Date: Wed, 9 Sep 2009 22:50:57 -0700 (PDT)
From: "haruhiko nishi (JIRA)" <jira@apache.org>
To: issues@commons.apache.org
Subject: [jira] Commented: (IO-218) Introduce new filter input stream with
 replacement facilities
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    [ https://issues.apache.org/jira/browse/IO-218?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12753434#action_12753434 ] 

haruhiko nishi commented on IO-218:
-----------------------------------

I've tried ReplaceFilterInputStream and got the following and got Exception. 

all I did was

 ReplaceFilterInputStream in=new ReplaceFilterInputStream(new FileInputStream("test.html"),map);
where map is 

map.put("yahoo".getBytes(),"google".getBytes());

then I get

Exception in thread "main" java.io.IOException: Push back buffer is full
	at java.io.PushbackInputStream.unread(PushbackInputStream.java:215)
	at jp.co.alibaba.util.template.reverse.groovy.ReplaceFilterInputStream.replaceWithExpand(ReplaceFilterInputStream.java:467)
	at jp.co.alibaba.util.template.reverse.groovy.ReplaceFilterInputStream.tryToReplace(ReplaceFilterInputStream.java:405)
	at jp.co.alibaba.util.template.reverse.groovy.ReplaceFilterInputStream.doRead(ReplaceFilterInputStream.java:340)
	at jp.co.alibaba.util.template.reverse.groovy.ReplaceFilterInputStream.read(ReplaceFilterInputStream.java:239)
	at TestMain.main(TestMain.java:30)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:90)

> Introduce new filter input stream with replacement facilities
> -------------------------------------------------------------
>
>                 Key: IO-218
>                 URL: https://issues.apache.org/jira/browse/IO-218
>             Project: Commons IO
>          Issue Type: Improvement
>          Components: Filters
>    Affects Versions: 1.4
>         Environment: all environments
>            Reporter: Denis Zhdanov
>             Fix For: 1.4, 2.0
>
>         Attachments: ReplaceFilterInputStream.java, ReplaceFilterInputStreamTest.java
>
>   Original Estimate: 120h
>  Remaining Estimate: 120h
>
> It seems convenient to have a FilterInputStream that allows to apply predefined repalcement rules against the read data. 
> For example we may want to configure the following replacements:
> {noformat}
> {1, } -> {7, 8}
> {1} -> {9}
> {3, 2} -> {}
> {noformat}
> and apply them to the input like
> {noformat}
> {4, 3, 2, 1, 2, 1, 3}
> {noformat}
> in order to get a result like
> {noformat}
> {4, 7, 8, 9, 3}
> {noformat}
> I created the class that allows to do that and attached it to this ticket. Unit test class at junit4 format is attached as well.
> So, the task is to review the provided classes, consider if it's worth to add them to commons-io distribution and perform the inclusion in the case of possible result.

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