Coerce a ByteArrayInputStream to InputStream

Question

I have some code that does:

content = Java::byte[s].new
f = tar.read(content, 0, s)
content_stream = ByteArrayInputStream.new(content)

So far, so good

But when I try to use a method that only takes an InputStream, like so:

metadata = ImageMetadataReader.readMetadata(content_stream)

I get the following exception:

NameError: no method 'readMetadata' for arguments (java.io.ByteArrayInputStream) on Java::ComDrewImaging::ImageMetadataReader

I've tried using content_stream.to_java(java.io.InputStream) and that still generates the same error. Any ideas?

score 1 · Accepted Answer · answered May 16 '13 at 08:13

1

The single-argument readMetadata() takes a file; there is a two-argument that takes a *Buffered*InputStream and a boolean. You could wrap your ByteArrayInputStream in a BufferedInputStream and decide whether you want to 'waitForBytes', whatever that means...

answered May 16 '13 at 08:13

arcy

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The BufferedInputStream was the answer! I thought I was going crazy, but I was just looking at the wrong version of ImageMetadataReader.java - from master, not 2.6.4, which is the version I'm actually using. Thanks! – clee May 16 '13 at 08:21

score 0 · Answer 2 · answered May 16 '13 at 08:09

0

It's because readMetadata has 2 signatures, one with one argument: a java.io.File and a second which you try to use that takes 2 arguments a ByteArrayInputStream and a boolean. Try to replace your code with ImageMetadataReader.readMetadata(content_stream, false)

answered May 16 '13 at 08:09

gma

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15
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That gets me `NameError: no method 'readMetadata' for arguments (java.io.ByteArrayInputStream,org.jruby.RubyBoolean.False) on Java::ComDrewImaging::ImageMetadataReader` – clee May 16 '13 at 08:19

Coerce a ByteArrayInputStream to InputStream

2 Answers2