jhm 2003/12/09 08:46:50
Modified: xdocs faq.xml
docs faq.html
Log:
How to use propertyvalues as name for properties
Revision Changes Path
1.44 +81 -63 ant/xdocs/faq.xml
Index: faq.xml
===================================================================
RCS file: /home/cvs/ant/xdocs/faq.xml,v
retrieving revision 1.43
retrieving revision 1.44
diff -u -r1.43 -r1.44
--- faq.xml 13 Oct 2003 15:29:52 -0000 1.43
+++ faq.xml 9 Dec 2003 16:46:50 -0000 1.44
@@ -11,7 +11,7 @@
<question>Where do I find the latest version of this
document?</question>
<answer>
- <p>The latest version can always be found at Ant's homepage
+ <p>The latest version can always be found at Ant's homepage
<a
href="http://ant.apache.org/faq.html";>http://ant.apache.org/faq.html</a>.</p>
</answer>
</faq>
@@ -19,12 +19,12 @@
<faq id="adding-faqs">
<question>How can I contribute to this FAQ?</question>
<answer>
- <p>The page you are looking it is generated from
+ <p>The page you are looking it is generated from
<a
href="http://cvs.apache.org/viewcvs.cgi/~checkout~/ant/xdocs/faq.xml";>this</a>
document. If you want to add a new question, please submit
a patch against this document to one of Ant's mailing lists;
hopefully, the structure is self-explanatory.</p>
-
+
<p>If you don't know how to create a patch, see the patches
section of <a
href="http://jakarta.apache.org/site/source.html";>this
page</a>.</p>
@@ -36,7 +36,7 @@
FAQ?</question>
<answer>
- <p>We use
+ <p>We use
<a href="http://jakarta.apache.org/velocity/anakia.html";>Anakia</a>
to render the HTML version from the original XML file.</p>
@@ -73,8 +73,8 @@
<p>According to Ant's original author, James Duncan
Davidson, the name is an acronym for "Another Neat
Tool".</p>
-
- <p>Later explanations go along the lines of "ants
+
+ <p>Later explanations go along the lines of "ants
do an extremely good job at building things", or
"ants are very small and can carry a weight dozens of times
their own" - describing what Ant is intended to
@@ -320,7 +320,7 @@
<source><![CDATA[
shell-prompt> m4 foo.m4 > foo
]]></source>
-
+
<p>and try to translate it into</p>
<source><![CDATA[
@@ -334,7 +334,7 @@
<p>This will not do what you expect. The output redirection is
performed by your shell, not the command itself, so this
should read:</p>
-
+
<source><![CDATA[
<exec executable="/bin/sh">
<arg value="-c" />
@@ -398,7 +398,7 @@
<p>To see how this works, assume you have three properties:
<code>prop1</code>, <code>prop2</code>, and <code>prop3</code>.
- You want to test that <code>prop1</code> and <code>prop2</code>
+ You want to test that <code>prop1</code> and <code>prop2</code>
are set, and that <code>prop3</code> is not. If the condition
holds true you want to echo "yes".</p>
@@ -470,8 +470,8 @@
<p>Because testing for a literal <code>${property}</code> string
isn't all that readable or easy to understand,
- post-1.4.1 Ant introduces the <code><isset></code> element
- to the <code><condition></code> task.</p>
+ post-1.4.1 Ant introduces the <code><isset></code> element
+ to the <code><condition></code> task.</p>
<p>Here is the previous example done using
<code><isset></code>:</p>
@@ -501,7 +501,7 @@
details.</p>
</answer>
</faq>
-
+
<faq id="encoding">
<question>How can I include national characters like German
umlauts in my build file?</question>
@@ -510,7 +510,7 @@
<p>You need to tell the XML parser which character encoding
your build file uses, this is done inside the <a
href="http://www.w3.org/TR/2000/REC-xml-20001006#sec-prolog-dtd";>XML
- declaration</a>.</p>
+ declaration</a>.</p>
<p>By default the parser assumes you are using the UTF-8
encoding instead of your platform's default. For most Western
@@ -540,6 +540,24 @@
necessary.</p>
</answer>
</faq>
+
+ <faq id="propertyvalue-as-name-for-property">
+ <question>How can I do something like <code><property name="prop"
+ value="${${anotherprop}}"/></code> (double expanding the
property)?</question>
+
+ <answer>
+ <p>Without any external help you can not.</p>
+ <p>With <script/>, which needs external libraries, you can
do</p>
+ <source><![CDATA[
+<script language="javascript">
+ propname = project.getProperty("anotherprop");
+ project.setNewProperty("prop", propname);
+</script>
+]]></source>
+ <p>With AntContrib (external task library) you can do <code>
+ <propertycopy name="prop" from="${anotherprop}"/></code>.</p>
+ </answer>
+ </faq>
</faqsection>
<faqsection title="It doesn't work (as expected)">
@@ -593,7 +611,7 @@
<p>Here's what you probably did:</p>
- <source><![CDATA[
+ <source><![CDATA[
<delete>
<fileset dir="${build.src}" includes="**/vssver.scc"/>
</delete>
@@ -601,13 +619,13 @@
<p>You need to switch off the default exclusions,
and it will work:</p>
- <source><![CDATA[
+ <source><![CDATA[
<delete>
<fileset dir="${build.src}" includes="**/vssver.scc"
defaultexcludes="no"/>
</delete>
]]></source>
-
+
<p>For a complete listing of the patterns that are excluded
by default, see <a href="manual/dirtasks.html#defaultexcludes">the
user
manual</a>.</p>
@@ -617,34 +635,34 @@
<faq id="stop-dependency">
<question>I have a target I want to skip if a property is set,
- so I have <code>unless="property"</code> as an attribute
- of the target, but all the targets this target
+ so I have <code>unless="property"</code> as an attribute
+ of the target, but all the targets this target
depends on are still executed. Why?</question>
<answer>
<p>The list of dependencies is generated by Ant before any of the
- targets are run. This allows dependent targets, such as an
- <code>init</code> target, to set properties that can control the
- execution of the targets higher in the dependency graph. This
- is a good thing.</p>
+ targets are run. This allows dependent targets, such as an
+ <code>init</code> target, to set properties that can control the
+ execution of the targets higher in the dependency graph. This
+ is a good thing.</p>
<p>However, when your dependencies break down the
higher-level task
- into several smaller steps, this behaviour becomes
+ into several smaller steps, this behaviour becomes
counter-intuitive. There are a couple of solutions available:
</p>
<ol>
<li>Put the same condition on each of the dependent targets.</li>
-
+
<li>Execute the steps using <code><antcall></code>,
instead of specifying them inside the <code>depends</code>
attribute.</li>
</ol>
-
+
</answer>
</faq>
-
+
<faq id="include-order">
<question>In my <code><fileset></code>, I've put in an
<code><exclude></code> of all files followed by an
@@ -662,14 +680,14 @@
elements only apply to the file list produced by the
<code><include></code> elements.</p>
- <p>To get the files you want, focus on just the
- <code><include></code> patterns that would be necessary
- to get them. If you find you need to trim the list that the
- <code><include></code> elements produce, then use
- <code><exclude></code> elements.</p>
+ <p>To get the files you want, focus on just the
+ <code><include></code> patterns that would be necessary
+ to get them. If you find you need to trim the list that the
+ <code><include></code> elements produce, then use
+ <code><exclude></code> elements.</p>
</answer>
</faq>
-
+
<faq id="properties-not-trimmed">
<question><code>ant</code> failed to build my program via javac
even when I put the needed jars in an external
@@ -718,7 +736,7 @@
<faq id="integration">
<question>Is Ant supported by my IDE/Editor?</question>
<answer>
- <p>See the <a href="external.html#IDE and Editor
Integration">section
+ <p>See the <a href="external.html#IDE and Editor Integration">section
on IDE integration</a> on our External Tools and Tasks page.</p>
</answer>
</faq>
@@ -740,10 +758,10 @@
<source><![CDATA[
# Detect (X)Emacs compile mode
-if [ "$EMACS" = "t" ] ; then
- ANT_ARGS="$ANT_ARGS -emacs"
- ANT_OPTS="$ANT_OPTS -Dbuild.compiler.emacs=true"
-fi
+if [ "$EMACS" = "t" ] ; then
+ ANT_ARGS="$ANT_ARGS -emacs"
+ ANT_OPTS="$ANT_OPTS -Dbuild.compiler.emacs=true"
+fi
]]></source>
<p>Alternatively, you can add the following snippet to your
@@ -753,10 +771,10 @@
<source><![CDATA[
(require 'compile)
(setq compilation-error-regexp-alist
- (append (list
+ (append (list
;; works for jikes
'("^\\s-*\\[[^]]*\\]\\s-*\\(.+\\):\\([0-9]+\\):\\([0-9]+\\):[0-9]+:[0-9]+:" 1 2
3)
- ;; works for javac
+ ;; works for javac
'("^\\s-*\\[[^]]*\\]\\s-*\\(.+\\):\\([0-9]+\\):" 1 2))
compilation-error-regexp-alist))
]]></source>
@@ -774,16 +792,16 @@
#
$|=1;
while(<STDIN>) {
- if (s/^(\s+)\[(\w+)\]//) {
- if ($2 ne $last) {
- print "$1\[$2\]";
- $s = ' ' x length($2);
- } else {
- print "$1 $s ";
- };
- $last = $2;
- };
- print;
+ if (s/^(\s+)\[(\w+)\]//) {
+ if ($2 ne $last) {
+ print "$1\[$2\]";
+ $s = ' ' x length($2);
+ } else {
+ print "$1 $s ";
+ };
+ $last = $2;
+ };
+ print;
};
]]></source>
@@ -805,7 +823,7 @@
<ul>
<li>It doesn't know about required attributes. Only
manual tweaking of this file can help here.</li>
-
+
<li>It is not complete - if you add new tasks via
<code><taskdef></code> it won't know about it. See
<a href="http://www.sdv.fr/pages/casa/html/ant-dtd.en.html";>this
@@ -911,7 +929,7 @@
BuildListener that sends out an email
in the buildFinished() method. Will Glozer
<[EMAIL PROTECTED]> has written such a listener based
- on <a href="http://java.sun.com/products/javamail/";>JavaMail</a>.
+ on <a href="http://java.sun.com/products/javamail/";>JavaMail</a>.
The source is:</p>
<source><![CDATA[
@@ -954,13 +972,13 @@
public void buildFinished(BuildEvent e) {
Throwable th = e.getException();
String status = (th != null) ? "failed" : "succeeded";
-
+
try {
String key = "build." + status;
if (props.getProperty(key +
".notify").equalsIgnoreCase("false")) {
return;
}
-
+
Session session = Session.getDefaultInstance(props, null);
MimeMessage message = new MimeMessage(session);
@@ -971,7 +989,7 @@
BufferedReader br = new BufferedReader(new FileReader(
props.getProperty("build.log")));
StringWriter sw = new StringWriter();
-
+
String line = br.readLine();
while (line != null) {
sw.write(line);
@@ -979,10 +997,10 @@
line = br.readLine();
}
br.close();
-
+
message.setText(sw.toString(), "UTF-8");
sw.close();
-
+
Transport transport = session.getTransport();
transport.connect();
transport.send(message);
@@ -1018,14 +1036,14 @@
public void targetFinished(BuildEvent e) {
}
- public void taskStarted(BuildEvent e) {
+ public void taskStarted(BuildEvent e) {
}
public void taskFinished(BuildEvent e) {
}
}
]]></source>
-
+
<p>With a <code>monitor.properties</code> like this:</p>
<source><![CDATA[
@@ -1049,13 +1067,13 @@
<p><code>monitor.properties</code> should be placed right next
to your compiled <code>BuildMonitor.class</code>. To use it,
invoke Ant like:</p>
-
+
<source><![CDATA[
ant -listener BuildMonitor -logfile build.log
]]></source>
<p>Make sure that <code>mail.jar</code> from JavaMail and
- <code>activation.jar</code> from the
+ <code>activation.jar</code> from the
<a
href="http://java.sun.com/products/javabeans/glasgow/jaf.html";>Java
Beans Activation Framework</a> are in your
<code>CLASSPATH</code>.</p>
@@ -1084,7 +1102,7 @@
results for properties that were specified on the Ant command
line.</p>
</answer>
</faq>
-
+
</faqsection>
<faqsection title="Known Problems">
@@ -1119,7 +1137,7 @@
<faq id="delegating-classloader">
<question><style> or <junit> ignores my
<classpath></question>
-
+
<answer>
<p>These tasks don't ignore your classpath setting, you
are facing a common problem with delegating classloaders.</p>
@@ -1318,4 +1336,4 @@
</faqsection>
-</document>
+</document>
\ No newline at end of file
1.87 +66 -47 ant/docs/faq.html
Index: faq.html
===================================================================
RCS file: /home/cvs/ant/docs/faq.html,v
retrieving revision 1.86
retrieving revision 1.87
diff -u -r1.86 -r1.87
--- faq.html 2 Dec 2003 11:51:11 -0000 1.86
+++ faq.html 9 Dec 2003 16:46:50 -0000 1.87
@@ -240,6 +240,10 @@
How do I use <code>jar</code>'s <code>M</code> switch?
I don't want a MANIFEST.
</a></li>
+ <li><a href="#propertyvalue-as-name-for-property">
+ How can I do something like <code><property name="prop"
+ value="${${anotherprop}}"/></code> (double expanding the property)?
+ </a></li>
</ul>
<h4 class="toc">It doesn't work (as expected)</h4>
<ul>
@@ -254,8 +258,8 @@
</a></li>
<li><a href="#stop-dependency">
I have a target I want to skip if a property is set,
- so I have <code>unless="property"</code> as an attribute
- of the target, but all the targets this target
+ so I have <code>unless="property"</code> as an attribute
+ of the target, but all the targets this target
depends on are still executed. Why?
</a></li>
<li><a href="#include-order">
@@ -340,13 +344,13 @@
Where do I find the latest version of this
document?
</p>
- <p>The latest version can always be found at Ant's
homepage
+ <p>The latest version can always be found at Ant's homepage
<a
href="http://ant.apache.org/faq.html";>http://ant.apache.org/faq.html</a>.</p>
<p class="faq">
<a name="adding-faqs"></a>
How can I contribute to this FAQ?
</p>
- <p>The page you are looking it is generated from
+ <p>The page you are looking it is generated from
<a
href="http://cvs.apache.org/viewcvs.cgi/~checkout~/ant/xdocs/faq.xml";>this</a>
document. If you want to add a new question, please submit
a patch against this document to one of Ant's mailing lists;
@@ -359,7 +363,7 @@
How do you create the HTML version of this
FAQ?
</p>
- <p>We use
+ <p>We use
<a href="http://jakarta.apache.org/velocity/anakia.html";>Anakia</a>
to render the HTML version from the original XML file.</p>
<p>The Velocity stylesheets used to process the XML
files can
@@ -386,7 +390,7 @@
<p>According to Ant's original author, James Duncan
Davidson, the name is an acronym for "Another Neat
Tool".</p>
- <p>Later explanations go along the lines of "ants
+ <p>Later explanations go along the lines of "ants
do an extremely good job at building things", or
"ants are very small and can carry a weight dozens of times
their own" - describing what Ant is intended to
@@ -747,7 +751,7 @@
to determine the specific state you want to test for.</p>
<p>To see how this works, assume you have three
properties:
<code>prop1</code>, <code>prop2</code>, and <code>prop3</code>.
- You want to test that <code>prop1</code> and <code>prop2</code>
+ You want to test that <code>prop1</code> and <code>prop2</code>
are set, and that <code>prop3</code> is not. If the condition
holds true you want to echo "yes".</p>
<p>Here is the implementation in Ant 1.3 and
earlier:</p>
@@ -811,8 +815,8 @@
</ul>
<p>Because testing for a literal
<code>${property}</code> string
isn't all that readable or easy to understand,
- post-1.4.1 Ant introduces the <code><isset></code> element
- to the <code><condition></code> task.</p>
+ post-1.4.1 Ant introduces the <code><isset></code> element
+ to the <code><condition></code> task.</p>
<p>Here is the previous example done using
<code><isset></code>:</p>
<pre class="code">
@@ -866,6 +870,21 @@
<code><zip></code> uses your platforms default encoding.
Use the encoding attribute of <code><zip></code> if
necessary.</p>
+ <p class="faq">
+ <a name="propertyvalue-as-name-for-property"></a>
+ How can I do something like <code><property name="prop"
+ value="${${anotherprop}}"/></code> (double expanding the property)?
+ </p>
+ <p>Without any external help you can not.</p>
+ <p>With <script/>, which needs external
libraries, you can do</p>
+ <pre class="code">
+<script language="javascript">
+ propname = project.getProperty("anotherprop");
+ project.setNewProperty("prop", propname);
+</script>
+</pre>
+ <p>With AntContrib (external task library) you can
do <code>
+ <propertycopy name="prop" from="${anotherprop}"/></code>.</p>
<p class="faq">
<a name="always-recompiles"></a>
Why does Ant always recompile all my Java files?
@@ -924,23 +943,23 @@
<p class="faq">
<a name="stop-dependency"></a>
I have a target I want to skip if a property is set,
- so I have <code>unless="property"</code> as an attribute
- of the target, but all the targets this target
+ so I have <code>unless="property"</code> as an attribute
+ of the target, but all the targets this target
depends on are still executed. Why?
</p>
<p>The list of dependencies is generated by Ant before any
of the
- targets are run. This allows dependent targets, such as an
- <code>init</code> target, to set properties that can control the
- execution of the targets higher in the dependency graph. This
- is a good thing.</p>
+ targets are run. This allows dependent targets, such as an
+ <code>init</code> target, to set properties that can control the
+ execution of the targets higher in the dependency graph. This
+ is a good thing.</p>
<p>However, when your dependencies break down the
higher-level task
- into several smaller steps, this behaviour becomes
+ into several smaller steps, this behaviour becomes
counter-intuitive. There are a couple of solutions available:
</p>
<ol>
<li>Put the same condition on each of the dependent targets.</li>
-
+
<li>Execute the steps using <code><antcall></code>,
instead of specifying them inside the <code>depends</code>
attribute.</li>
@@ -962,10 +981,10 @@
elements only apply to the file list produced by the
<code><include></code> elements.</p>
<p>To get the files you want, focus on just the
- <code><include></code> patterns that would be necessary
- to get them. If you find you need to trim the list that the
- <code><include></code> elements produce, then use
- <code><exclude></code> elements.</p>
+ <code><include></code> patterns that would be necessary
+ to get them. If you find you need to trim the list that the
+ <code><include></code> elements produce, then use
+ <code><exclude></code> elements.</p>
<p class="faq">
<a name="properties-not-trimmed"></a>
<code>ant</code> failed to build my program via javac
@@ -1002,7 +1021,7 @@
<a name="integration"></a>
Is Ant supported by my IDE/Editor?
</p>
- <p>See the <a href="external.html#IDE and Editor
Integration">section
+ <p>See the <a href="external.html#IDE and Editor
Integration">section
on IDE integration</a> on our External Tools and Tasks page.</p>
<p class="faq">
<a name="emacs-mode"></a>
@@ -1019,10 +1038,10 @@
<code>.antrc</code> (contributed by Ville Skytt�).</p>
<pre class="code">
# Detect (X)Emacs compile mode
-if [ "$EMACS" = "t" ] ; then
- ANT_ARGS="$ANT_ARGS -emacs"
- ANT_OPTS="$ANT_OPTS -Dbuild.compiler.emacs=true"
-fi
+if [ "$EMACS" = "t" ] ; then
+ ANT_ARGS="$ANT_ARGS -emacs"
+ ANT_OPTS="$ANT_OPTS -Dbuild.compiler.emacs=true"
+fi
</pre>
<p>Alternatively, you can add the following snippet
to your
<code>.emacs</code> to make Emacs understand Ant's
@@ -1030,10 +1049,10 @@
<pre class="code">
(require 'compile)
(setq compilation-error-regexp-alist
- (append (list
+ (append (list
;; works for jikes
'("^\\s-*\\[[^]]*\\]\\s-*\\(.+\\):\\([0-9]+\\):\\([0-9]+\\):[0-9]+:[0-9]+:"
1 2 3)
- ;; works for javac
+ ;; works for javac
'("^\\s-*\\[[^]]*\\]\\s-*\\(.+\\):\\([0-9]+\\):" 1 2))
compilation-error-regexp-alist))
</pre>
@@ -1049,16 +1068,16 @@
#
$|=1;
while(<STDIN>) {
- if (s/^(\s+)\[(\w+)\]//) {
- if ($2 ne $last) {
- print "$1\[$2\]";
- $s = ' ' x length($2);
- } else {
- print "$1 $s ";
- };
- $last = $2;
- };
- print;
+ if (s/^(\s+)\[(\w+)\]//) {
+ if ($2 ne $last) {
+ print "$1\[$2\]";
+ $s = ' ' x length($2);
+ } else {
+ print "$1 $s ";
+ };
+ $last = $2;
+ };
+ print;
};
</pre>
<p class="faq">
@@ -1072,7 +1091,7 @@
<ul>
<li>It doesn't know about required attributes. Only
manual tweaking of this file can help here.</li>
-
+
<li>It is not complete - if you add new tasks via
<code><taskdef></code> it won't know about it. See
<a href="http://www.sdv.fr/pages/casa/html/ant-dtd.en.html";>this
@@ -1162,7 +1181,7 @@
BuildListener that sends out an email
in the buildFinished() method. Will Glozer
<[EMAIL PROTECTED]> has written such a listener based
- on <a href="http://java.sun.com/products/javamail/";>JavaMail</a>.
+ on <a href="http://java.sun.com/products/javamail/";>JavaMail</a>.
The source is:</p>
<pre class="code">
import java.io.*;
@@ -1204,13 +1223,13 @@
public void buildFinished(BuildEvent e) {
Throwable th = e.getException();
String status = (th != null) ? "failed" :
"succeeded";
-
+
try {
String key = "build." + status;
if (props.getProperty(key +
".notify").equalsIgnoreCase("false")) {
return;
}
-
+
Session session = Session.getDefaultInstance(props, null);
MimeMessage message = new MimeMessage(session);
@@ -1221,7 +1240,7 @@
BufferedReader br = new BufferedReader(new FileReader(
props.getProperty("build.log")));
StringWriter sw = new StringWriter();
-
+
String line = br.readLine();
while (line != null) {
sw.write(line);
@@ -1229,10 +1248,10 @@
line = br.readLine();
}
br.close();
-
+
message.setText(sw.toString(), "UTF-8");
sw.close();
-
+
Transport transport = session.getTransport();
transport.connect();
transport.send(message);
@@ -1268,7 +1287,7 @@
public void targetFinished(BuildEvent e) {
}
- public void taskStarted(BuildEvent e) {
+ public void taskStarted(BuildEvent e) {
}
public void taskFinished(BuildEvent e) {
@@ -1300,7 +1319,7 @@
ant -listener BuildMonitor -logfile build.log
</pre>
<p>Make sure that <code>mail.jar</code> from
JavaMail and
- <code>activation.jar</code> from the
+ <code>activation.jar</code> from the
<a
href="http://java.sun.com/products/javabeans/glasgow/jaf.html";>Java
Beans Activation Framework</a> are in your
<code>CLASSPATH</code>.</p>
<p class="faq">
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