Convert Narya (most of the way) over to a Maven Ant task based build. The

ActionScript bits remain belligerent, but the Java stuff is mostly shipshape.


git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@6222 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/main/java/com/threerings/presents/tools/GenTask.java

@@ -0,0 +1,163 @@
+//
+// $Id$
+//
+// Narya library - tools for developing networked games
+// Copyright (C) 2002-2010 Three Rings Design, Inc., All Rights Reserved
+// http://code.google.com/p/narya/
+//
+// This library is free software; you can redistribute it and/or modify it
+// under the terms of the GNU Lesser General Public License as published
+// by the Free Software Foundation; either version 2.1 of the License, or
+// (at your option) any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+package com.threerings.presents.tools;
+
+import java.util.List;
+import java.util.Map;
+
+import java.io.File;
+import java.io.InputStreamReader;
+
+import org.apache.tools.ant.AntClassLoader;
+import org.apache.tools.ant.BuildException;
+import org.apache.tools.ant.DirectoryScanner;
+import org.apache.tools.ant.Task;
+import org.apache.tools.ant.types.FileSet;
+import org.apache.tools.ant.types.Reference;
+import org.apache.tools.ant.util.ClasspathUtils;
+
+import com.google.common.collect.Maps;
+import com.google.common.collect.Lists;
+
+import com.samskivert.mustache.Mustache;
+
+public abstract class GenTask extends Task
+{
+    /**
+     * Adds a nested <fileset> element which enumerates service declaration source files.
+     */
+    public void addFileset (FileSet set)
+    {
+        _filesets.add(set);
+    }
+
+    /**
+     * Configures to output extra information when generating code.
+     */
+    public void setVerbose (boolean verbose)
+    {
+        _verbose = verbose;
+    }
+
+    /** Configures our classpath which we'll use to load service classes. */
+    public void setClasspathref (Reference pathref)
+    {
+        _cloader = ClasspathUtils.getClassLoaderForPath(getProject(), pathref);
+
+        // set the parent of the classloader to be the classloader used to load this task, rather
+        // than the classloader used to load Ant, so that we have access to Narya classes like
+        // TransportHint
+        ((AntClassLoader)_cloader).setParent(getClass().getClassLoader());
+    }
+
+    /**
+     * Performs the actual work of the task.
+     */
+    @Override
+    public void execute ()
+    {
+        for (FileSet fs : _filesets) {
+            DirectoryScanner ds = fs.getDirectoryScanner(getProject());
+            File fromDir = fs.getDir(getProject());
+            String[] srcFiles = ds.getIncludedFiles();
+            for (String srcFile : srcFiles) {
+                File source = new File(fromDir, srcFile);
+                try {
+                    processClass(source, loadClass(source));
+                } catch (Exception e) {
+                    throw new BuildException(e);
+                }
+            }
+        }
+    }
+
+    /**
+     * Merges the specified template using the supplied mapping of keys to objects.
+     *
+     * @param data a series of key, value pairs where the keys must be strings and the values can
+     * be any object.
+     */
+    protected String mergeTemplate (String template, Object... data)
+        throws Exception
+    {
+        Map<String, Object> ctx = Maps.newHashMap();
+        for (int ii = 0; ii < data.length; ii += 2) {
+            ctx.put((String)data[ii], data[ii+1]);
+        }
+        return mergeTemplate(template, ctx);
+    }
+
+    /**
+     * Merges the specified template using the supplied mapping of string keys to objects.
+     *
+     * @return a string containing the merged text.
+     */
+    protected String mergeTemplate (String template, Map<String, Object> data)
+        throws Exception
+    {
+        return Mustache.compiler().escapeHTML(false).compile(new InputStreamReader(
+            getClass().getClassLoader().getResourceAsStream(template), "UTF-8")).execute(data);
+    }
+
+    /**
+     * Process a class found from the given source file that was on the filesets given to this
+     * task.
+     */
+    protected abstract void processClass (File source, Class<?> klass)
+        throws Exception;
+
+    protected Class<?> loadClass (File source)
+    {
+        // load up the file and determine it's package and classname
+        String name;
+        try {
+            name = GenUtil.readClassName(source);
+        } catch (Exception e) {
+            throw new BuildException("Failed to parse " + source + ": " + e.getMessage());
+        }
+        return loadClass(name);
+    }
+
+    protected Class<?> loadClass (String name)
+    {
+        if (_cloader == null) {
+            throw new BuildException("This task requires a 'classpathref' attribute " +
+                "to be set to the project's classpath.");
+        }
+        try {
+            return _cloader.loadClass(name);
+        } catch (ClassNotFoundException cnfe) {
+            throw new BuildException(
+                "Failed to load " + name + ".  Be sure to set the 'classpathref' attribute to a " +
+                "classpath that contains your project's presents classes.", cnfe);
+        }
+    }
+
+    /** A list of filesets that contain java source to be processed. */
+    protected List<FileSet> _filesets = Lists.newArrayList();
+
+    /** Show extra output if set. */
+    protected boolean _verbose;
+
+    /** Used to do our own classpath business. */
+    protected ClassLoader _cloader;
+}