Filtering resources with different encodings - maven

Question

I have a maven project. In /src/main/resources/ I have two files foo.properties and bar.xml. The first is encoded in ISO-8859-1 and the second one in UTF-8.
Is there an easy way to get filtering for both files without breaking encoding?
As far as I see, I cannot specify an encoding in a <resource> block. It seems only possible to specify an encoding for the plugin itself, but this would lead in both files being filtered using the same encoding.
Ideally I would like to specify something like:
*.properties -> filter using ISO-8859-1
*.xml -> filter using UTF-8
*.pdf -> do not filter
anything else -> filter using default encoding
This doesn't feel like a very unusual situation, is there an easy way to configure this?

Answer 1

First i would suggest to put those resources which are iso based into a different directory like src/main/iso-resources and use something like this:
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<name>Resource Test</name>
<build>
<pluginManagement>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-resources-plugin</artifactId>
<configuration>
<nonFilteredFileExtensions>
<nonFilteredFileExtension>pdf</nonFilteredFileExtension>
</nonFilteredFileExtensions>
</configuration>
</plugin>
</plugins>
</pluginManagement>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-resources-plugin</artifactId>
<executions>
<execution>
<id>copy-iso-part</id>
<goals><goal>copy-resources</goal></goals>
<phase>process-resources</phase>
<configuration>
<encoding>ISO-8859-1</encoding>
<resources>
<resource>
<directory>src/main/iso-resources/</directory>
</resource>
</resources>
<outputDirectory>${project.build.outputDirectory}</outputDirectory>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>

Answer 2

If you don't want to keep your resources in separate directories you can also keep them in the default directory src/main/resources and play with exclusions.
The idea is:
file extensions that should not be filtered should be added to the default configuration using nonFilteredFileExtensions
let the default execution of the resources plugin process resources with the default encoding
exclude files that do no use this encoding from the build/resources configuration
for each additional encoding you want to handle, add an execution of goal "copy-resources" with explicit includes that selects only the targeted files
This example only handles .properties but you can easily generalize:
<resources>
<resource>
<directory>src/main/resources</directory>
<excludes>
<exclude>application*.properties</exclude>
</excludes>
<filtering>true</filtering>
</resource>
</resources>
...
<plugin>
<artifactId>maven-resources-plugin</artifactId>
<configuration>
<nonFilteredFileExtensions>
<nonFilteredFileExtension>pdf</nonFilteredFileExtension>
</nonFilteredFileExtensions>
</configuration>
<executions>
<execution>
<id>properties</id>
<phase>process-resources</phase>
<goals>
<goal>copy-resources</goal>
</goals>
<configuration>
<encoding>ISO-8859-1</encoding>
<resources>
<resource>
<directory>src/main/resources</directory>
<filtering>true</filtering>
<includes>
<include>application*.properties</include>
</includes>
</resource>
</resources>
<outputDirectory>${project.build.outputDirectory}</outputDirectory>
</configuration>
</execution>
</executions>
</plugin>