使用Eclipse中的Ant将在运行时生成的文件夹添加为源文件夹

Question

I am using the following bunch of softwares:

1. Ant 1.7.1
2. Eclipse Helios
3. Java 1.6
4. Apache thrift 0.8.0

I am using Thrift to generate java source code in Ant using the following code block:

<exec executable="thrift-0.8.0.exe" osfamily="windows">
    <arg value="-out" />
    <arg value="java/src" />
    <arg value="--gen" />
    <arg value="java" />
    <arg file="Sample.thrift" />
</exec>

So, now I want to add the generated src folder automatically to the classpath of the project in Eclipse using Ant so that it is shown as a source folder when I open the project in Eclipse.

NOTE: I understand that the classpath for a project is present in the .classpath file and adding a classpathentry to it would solve my issue. But I want Eclipse to do that instead of me doing it in the .classpath file manually.

Further, I also had a look at the Ant-Eclipse project and found an Ant task to create a new Eclipse Java project and display its src folder as a source folder. But I don't want a dependency on an external library.

<project name="test" default="eclipse" basedir=".">
    <target name="eclipse">
        <taskdef name="eclipse" classname="prantl.ant.eclipse.EclipseTask" />
        <eclipse>
            <project />
            <classpath>
                <source path="src" />
                <output path="bin" />
            </classpath>
        </eclipse>
    </target>
</project>

Is there a way to do this in the already existing Ant library in Eclipse?

Thanks a lot!

Answer 1

The eclipse .classpath file is an XML document, so adding a source folder in there involves editing XML. Unfortunately, Ant doesn't have any built-in facilities for manipulating XML in any meaningful way. I've used xmltask for editing .classpath and .project files myself, but that's an external library you said you don't really want.

All is not lost, however - Ant supports running scripts , including Groovy, which treats XML as a first-class citizen . I wish I could say I had enough experience with Groovy to give you more than some links, but what you're after looks very doable with some calls to appendNode() .

Answer 2

If you really don't want to depend on anything external then you could consider using an XSLT stylesheet to edit the .classpath file (which is XML).

add-dir.xsl

<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
  <xsl:param name="pathToAdd" />

  <xsl:strip-space elements="*" />
  <xsl:output method="xml" indent="yes" />

  <xsl:template match="@* | node()">
    <xsl:copy>
      <xsl:apply-templates select="@* | node()" />
    </xsl:copy>
  </xsl:template>

  <xsl:template match="classpath">
    <xsl:copy>
      <xsl:apply-templates select="@* | node()" />
      <!-- don't add a 2nd copy of the classpathentry if one already exists -->
      <xsl:if test="not(classpathentry[@kind = 'src'][@path = $pathToAdd])">
        <classpathentry kind="src" path="{$pathToAdd}" />
      </xsl:if>
    </xsl:copy>
  </xsl:template>
</xsl:stylesheet>

build.xml

<xslt in=".classpath" out=".classpath.edited" style="add-dir.xsl">
  <param name="pathToAdd" expression="java/src" />
</xslt>
<move file=".classpath.edited" tofile=".classpath" overwrite="yes" />