Merged JSR-231 branch on to the main JOGL trunk. The main trunk now

contains the evolving JSR-231 Reference Implementation and the JSR-231
branch is permanently closed.


git-svn-id: file:///usr/local/projects/SUN/JOGL/git-svn/svn-server-sync/jogl/trunk@401 232f8b59-042b-4e1e-8c03-345bb8c30851

2 files changed, 797 insertions, 0 deletions

diff --git a/src/classes/com/sun/gluegen/ant/GlueGenTask.java b/src/classes/com/sun/gluegen/ant/GlueGenTask.java
new file mode 100644
index 000000000..b90009883
--- /dev/null
+++ b/src/classes/com/sun/gluegen/ant/GlueGenTask.java
@@ -0,0 +1,494 @@
+package com.sun.gluegen.ant;
+
+/*
+ * GlueGenTask.java
+ * Copyright (C) 2003 Rob Grzywinski ([email protected])
+ *
+ * Copying, distribution and use of this software in source and binary
+ * forms, with or without modification, is permitted provided that the
+ * following conditions are met:
+ *
+ * Distributions of source code must reproduce the copyright notice,
+ * this list of conditions and the following disclaimer in the source
+ * code header files; and Distributions of binary code must reproduce
+ * the copyright notice, this list of conditions and the following
+ * disclaimer in the documentation, Read me file, license file and/or
+ * other materials provided with the software distribution.
+ *
+ * The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
+ * holder may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS," WITHOUT A WARRANTY OF ANY
+ * KIND. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
+ * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, NON-INTERFERENCE, ACCURACY OF
+ * INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
+ * COPYRIGHT HOLDER, SUN AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL THE
+ * COPYRIGHT HOLDER, SUN OR SUN'S LICENSORS BE LIABLE FOR ANY LOST
+ * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
+ * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
+ * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
+ * INABILITY TO USE THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
+ * DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
+ * OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
+ * HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
+ * WARRANTY OF FITNESS FOR SUCH USES.
+ */
+
+import java.io.IOException;
+import java.util.Iterator;
+import java.util.LinkedList;
+import java.util.List;
+
+import org.apache.tools.ant.BuildException;
+import org.apache.tools.ant.DirectoryScanner;
+import org.apache.tools.ant.Project;
+import org.apache.tools.ant.Task;
+import org.apache.tools.ant.taskdefs.Execute;
+import org.apache.tools.ant.taskdefs.LogStreamHandler;
+import org.apache.tools.ant.types.CommandlineJava;
+import org.apache.tools.ant.types.DirSet;
+import org.apache.tools.ant.types.FileSet;
+import org.apache.tools.ant.types.Path;
+import org.apache.tools.ant.types.PatternSet;
+import org.apache.tools.ant.types.Reference;
+import org.apache.tools.ant.util.JavaEnvUtils;
+
+/**
+ * <p>An <a href="http://ant.apache.org">ANT</a> {@link org.apache.tools.ant.Task}
+ * for using {@link com.sun.gluegen.GlueGen}.</p>
+ * 
+ * <p>Usage:</p>
+ * <pre>
+    &lt;gluegen src="[source C file]" 
+                includes="[optional directory pattern of include files to include]"
+                excludes="[optional directory pattern of include files to exclude]"
+                includeRefid="[optional FileSet or DirSet for include files]"
+                literalInclude="[optional hack to get around FileSet / DirSet issues with different drives]"
+                emitter="[emitter class name]"
+                config="[configuration file]" /&gt;
+ * </pre> 
+ *
+ * @author Rob Grzywinski <a href="mailto:[email protected]">[email protected]</a>
+ */
+// FIXME:  blow out javadoc
+// NOTE:  this has not been exhaustively tested
+public class GlueGenTask extends Task
+{
+    /**
+     * <p>The {@link com.sun.gluegen.GlueGen} classname.</p>
+     */
+    private static final String GLUE_GEN = "com.sun.gluegen.GlueGen";
+    
+    // =========================================================================
+    /**
+     * <p>The {@link org.apache.tools.ant.types.CommandlineJava} that is used
+     * to execute {@link com.sun.gluegen.GlueGen}.</p>
+     */
+    private CommandlineJava gluegenCommandline;
+
+    // =========================================================================
+    /**
+     * <p>The name of the emitter class.</p>
+     */
+    private String emitter;
+
+    /**
+     * <p>The configuration file name.</p>
+     */
+    private String configuration;
+    
+    /**
+     * <p>The name of the source C file that is to be parsed.</p>
+     */
+    private String sourceFile;
+    
+    /**
+     * <p>The {@link org.apache.tools.ant.types.FileSet} of includes.</p>
+     */
+    private FileSet includeSet = new FileSet();
+    
+    /**
+     * <p>Because a {@link org.apache.tools.ant.types.FileSet} will include
+     * everything in its base directory if it is left untouched, the <code>includeSet</code>
+     * must only be added to the set of includes if it has been <i>explicitly</i>
+     * set.</p>
+     */
+    private boolean usedIncludeSet = false; // by default it is not used 
+    
+    /**
+     * <p>The set of include sets.  This allows includes to be added in multiple
+     * fashions.</p>
+     */
+    // FIXME:  rename to listXXXX
+    private List setOfIncludeSets = new LinkedList();
+
+    /**
+     * <p>A single literal directory to include.  This is to get around the
+     * fact that neither {@link org.apache.tools.ant.types.FileSet} nor
+     * {@link org.apache.tools.ant.types.DirSet} can handle multiple drives in
+     * a sane manner.  If <code>null</code> then it has not been specified.</p>
+     */
+    private String literalInclude;
+    
+    // =========================================================================
+    /**
+     * <p>Create and add the VM and classname to {@link org.apache.tools.ant.types.CommandlineJava}.</p>
+     */
+    public GlueGenTask()
+    {
+        // create the CommandlineJava that will be used to call GlueGen
+        gluegenCommandline = new CommandlineJava();
+        
+        // set the VM and classname in the commandline
+        gluegenCommandline.setVm(JavaEnvUtils.getJreExecutable("java"));
+        gluegenCommandline.setClassname(GLUE_GEN);
+        // gluegenCommandline.createVmArgument().setValue("-verbose:class");
+    }
+
+    // =========================================================================
+    // ANT getters and setters
+    /**
+     * <p>Set the emitter class name.  This is called by ANT.</p>
+     * 
+     * @param  emitter the name of the emitter class
+     */
+    public void setEmitter(String emitter)
+    {
+        log( ("Setting emitter class name to: " + emitter), Project.MSG_VERBOSE);
+        this.emitter = emitter;
+    }
+
+    /**
+     * <p>Set the configuration file name.  This is called by ANT.</p>
+     * 
+     * @param  configuration the name of the configuration file
+     */
+    public void setConfig(String configuration)
+    {
+        log( ("Setting configuration file name to: " + configuration), 
+              Project.MSG_VERBOSE);
+        this.configuration = configuration;
+    }
+
+    /**
+     * <p>Set the source C file that is to be parsed.  This is called by ANT.</p>
+     * 
+     * @param  sourceFile the name of the source file
+     */
+    public void setSrc(String sourceFile)
+    {
+        log( ("Setting source file name to: " + sourceFile), Project.MSG_VERBOSE);
+        this.sourceFile = sourceFile;
+    }
+
+    /**
+     * <p>Set a single literal include directory.  See the <code>literalInclude</code>
+     * javadoc for more information.</p>
+     * 
+     * @param  directory the directory to include
+     */
+    public void setLiteralInclude(String directory)
+    {
+        this.literalInclude = directory;
+    }
+
+    /**
+     * <p>Add an include file to the list.  This is called by ANT for a nested
+     * element.</p>
+     * 
+     * @return {@link org.apache.tools.ant.types.PatternSet.NameEntry}
+     */
+    public PatternSet.NameEntry createInclude()
+    {
+        usedIncludeSet = true;
+        return includeSet.createInclude();
+    }
+
+    /**
+     * <p>Add an include file to the list.  This is called by ANT for a nested
+     * element.</p>
+     * 
+     * @return {@link org.apache.tools.ant.types.PatternSet.NameEntry}
+     */
+    public PatternSet.NameEntry createIncludesFile()
+    {
+        usedIncludeSet = true;
+        return includeSet.createIncludesFile();
+    }
+
+    /**
+     * <p>Set the set of include patterns.  Patterns may be separated by a comma
+     * or a space.  This is called by ANT.</p>
+     *
+     * @param  includes the string containing the include patterns
+     */
+    public void setIncludes(String includes)
+    {
+        usedIncludeSet = true;
+        includeSet.setIncludes(includes);
+    }
+
+    /**
+     * <p>Add an include file to the list that is to be exluded.  This is called 
+     * by ANT for a nested element.</p>
+     * 
+     * @return {@link org.apache.tools.ant.types.PatternSet.NameEntry}
+     */
+    public PatternSet.NameEntry createExclude()
+    {
+        usedIncludeSet = true;
+        return includeSet.createExclude();
+    }
+
+    /**
+     * <p>Add an exclude file to the list.  This is called by ANT for a nested
+     * element.</p>
+     * 
+     * @return {@link org.apache.tools.ant.types.PatternSet.NameEntry}
+     */
+    public PatternSet.NameEntry createExcludesFile()
+    {
+        usedIncludeSet = true;
+        return includeSet.createExcludesFile();
+    }
+
+    /**
+     * <p>Set the set of exclude patterns.  Patterns may be separated by a comma
+     * or a space.  This is called by ANT.</p>
+     *
+     * @param  includes the string containing the exclude patterns
+     */
+    public void setExcludes(String excludes)
+    {
+        usedIncludeSet = true;
+        includeSet.setExcludes(excludes);
+    }
+
+    /**
+     * <p>Set a {@link org.apache.tools.ant.types.Reference} to simplify adding
+     * of complex sets of files to include.  This is called by ANT.</p>?
+     * 
+     * @param  reference a <code>Reference</code> to a {@link org.apache.tools.ant.types.FileSet}
+     *         or {@link org.apache.tools.ant.types.DirSet}
+     * @throws BuildException if the specified <code>Reference</code> is not
+     *         either a <code>FileSet</code> or <code>DirSet</code>
+     */
+    public void setIncludeRefid(Reference reference) 
+    {
+        // ensure that the referenced object is either a FileSet or DirSet
+        final Object referencedObject = reference.getReferencedObject(getProject());
+        if( !( (referencedObject instanceof FileSet) || 
+               (referencedObject instanceof DirSet)) )
+        {               
+            throw new BuildException("Only FileSets or DirSets are allowed as an include refid.");
+        }
+
+        // add the referenced object to the set of include sets
+        setOfIncludeSets.add(referencedObject); 
+    }
+
+    /**
+     * <p>Add a nested {@link org.apache.tools.ant.types.DirSet} to specify
+     * the files to include.  This is called by ANT.</p>
+     * 
+     * @param  dirset the <code>DirSet</code> to be added
+     */
+    public void addDirset(DirSet dirset)
+    {
+        setOfIncludeSets.add(dirset);
+    }
+
+    /**
+     * <p>Add an optional classpath that defines the location of {@link com.sun.gluegen.GlueGen}
+     * and <code>GlueGen</code>'s dependencies.</p>
+     * 
+     * @returns {@link org.apache.tools.ant.types.Path}
+     */
+     public Path createClasspath()
+     {
+         return gluegenCommandline.createClasspath(project).createPath();
+     }
+
+    // =========================================================================
+    /**
+     * <p>Run the task.  This involves validating the set attributes, creating
+     * the command line to be executed and finally executing the command.</p>
+     * 
+     * @see  org.apache.tools.ant.Task#execute()
+     */
+    public void execute() 
+        throws BuildException 
+    {
+        // validate that all of the required attributes have been set
+        validateAttributes();
+        
+        // TODO:  add logic to determine if the generated file needs to be
+        //        regenerated
+        
+        // add the attributes to the CommandlineJava
+        addAttributes();
+
+        log(gluegenCommandline.describeCommand(), Project.MSG_VERBOSE);
+        
+        // execute the command and throw on error
+        final int error = execute(gluegenCommandline.getCommandline());
+        if(error == 1)
+            throw new BuildException( ("GlueGen returned: " + error), location);
+    }
+
+    /**
+     * <p>Ensure that the user specified all required arguments.</p>
+     * 
+     * @throws BuildException if there are required arguments that are not 
+     *         present or not valid
+     */
+    private void validateAttributes() 
+        throws BuildException
+    {
+        // validate that the emitter class is set
+        if(!isValid(emitter))
+            throw new BuildException("Invalid emitter class name: " + emitter);
+
+        // validate that the configuration file is set
+        if(!isValid(configuration))
+            throw new BuildException("Invalid configuration file name: " + configuration);
+            
+        // validate that the source file is set
+        if(!isValid(sourceFile))
+            throw new BuildException("Invalid source file name: " + sourceFile);
+            
+        // CHECK:  do there need to be includes to be valid?
+    }
+
+    /**
+     * <p>Is the specified string valid?  A valid string is non-<code>null</code>
+     * and has a non-zero length.</p>
+     * 
+     * @param  string the string to be tested for validity
+     * @return <code>true</code> if the string is valid.  <code>false</code>
+     *         otherwise. 
+     */
+    private boolean isValid(String string)
+    {
+        // check for null
+        if(string == null)
+            return false;
+            
+        // ensure that the string has a non-zero length
+        // NOTE:  must trim() to remove leading and trailing whitespace
+        if(string.trim().length() < 1)
+            return false;
+            
+        // the string is valid
+        return true;
+    }
+
+    /**
+     * <p>Add all of the attributes to the command line.  They have already
+     * been validated.</p>
+     */
+    private void addAttributes()
+        throws BuildException
+    {
+        // NOTE:  GlueGen uses concatenated flag / value rather than two 
+        //        separate arguments
+        
+        // add the emitter class name
+        gluegenCommandline.createArgument().setValue("-E" + emitter);
+        
+        // add the configuration file name
+        gluegenCommandline.createArgument().setValue("-C" + configuration);
+        
+        // add the includedSet to the setOfIncludeSets to simplify processing
+        // all types of include sets ONLY if it has been set.
+        // NOTE:  see the usedIncludeSet member javadoc for more info 
+        // NOTE:  references and nested DirSets have already been added to the
+        //        set of include sets
+        if(usedIncludeSet)
+        {
+            includeSet.setDir(getProject().getBaseDir()); // NOTE:  the base dir must be set
+            setOfIncludeSets.add(includeSet);
+        }
+        
+        // iterate over all include sets and add their directories to the 
+        // list of included directories.
+        final List includedDirectories = new LinkedList();
+        for(Iterator includes=setOfIncludeSets.iterator(); includes.hasNext(); )
+        {
+            // get the included set and based on its type add the directories
+            // to includedDirectories
+        	Object include = (Object)includes.next();
+            final String[] directoryDirs;
+            if(include instanceof FileSet)
+            {
+                final FileSet fileSet = (FileSet)include;
+                DirectoryScanner directoryScanner = fileSet.getDirectoryScanner(getProject());
+                directoryDirs = directoryScanner.getIncludedDirectories();
+            } else if(include instanceof DirSet)
+            {
+                final DirSet dirSet = (DirSet)include;
+                DirectoryScanner directoryScanner = dirSet.getDirectoryScanner(getProject());
+                directoryDirs = directoryScanner.getIncludedDirectories();
+            } else 
+            {
+                // NOTE:  this cannot occur as it is checked on setXXX() but
+                //        just to be pedantic this is here
+                throw new BuildException("Invalid included construct."); 
+            }
+        	
+            // add the directoryDirs to the includedDirectories
+            // TODO:  exclude any directory that is already in the list
+            for(int i=0; i<directoryDirs.length; i++)
+            {
+            	includedDirectories.add(directoryDirs[i]);
+            }
+        }
+        
+        // if literalInclude is valid then add it to the list of included
+        // directories
+        if(isValid(literalInclude))
+            includedDirectories.add(literalInclude); 
+        
+        // add the included directories to the command
+        for(Iterator includes=includedDirectories.iterator(); includes.hasNext(); )
+        {
+        	String directory = (String)includes.next();
+            gluegenCommandline.createArgument().setValue("-I" + directory);
+        }
+
+        // finally, add the source file
+        gluegenCommandline.createArgument().setValue(sourceFile);
+    }
+
+    /** 
+     * <p>Execute {@link com.sun.gluegen.GlueGen} in a forked JVM.</p>
+     * 
+     * @throws BuildException
+     */
+    private int execute(String[] command) 
+        throws BuildException
+    {
+        // create the object that will perform the command execution
+        Execute execute = new Execute(new LogStreamHandler(this, Project.MSG_INFO,
+                                                           Project.MSG_WARN), 
+                                      null);
+                                      
+        // set the project and command line
+        execute.setAntRun(project);
+        execute.setCommandline(command);
+        
+        // execute the command
+        try
+        {
+            return execute.execute();
+        } catch(IOException ioe)
+        {
+            throw new BuildException(ioe, location);
+        }
+    }
+}
diff --git a/src/classes/com/sun/gluegen/ant/StaticGLGenTask.java b/src/classes/com/sun/gluegen/ant/StaticGLGenTask.java
new file mode 100644
index 000000000..255ab8a1a
--- /dev/null
+++ b/src/classes/com/sun/gluegen/ant/StaticGLGenTask.java
@@ -0,0 +1,303 @@
+package com.sun.gluegen.ant;
+
+/*
+ * StaticGLGenTask.java
+ * Copyright (C) 2003 Rob Grzywinski ([email protected])
+ *
+ * Copying, distribution and use of this software in source and binary
+ * forms, with or without modification, is permitted provided that the
+ * following conditions are met:
+ *
+ * Distributions of source code must reproduce the copyright notice,
+ * this list of conditions and the following disclaimer in the source
+ * code header files; and Distributions of binary code must reproduce
+ * the copyright notice, this list of conditions and the following
+ * disclaimer in the documentation, Read me file, license file and/or
+ * other materials provided with the software distribution.
+ *
+ * The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
+ * holder may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS," WITHOUT A WARRANTY OF ANY
+ * KIND. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
+ * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, NON-INTERFERENCE, ACCURACY OF
+ * INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
+ * COPYRIGHT HOLDER, SUN AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL THE
+ * COPYRIGHT HOLDER, SUN OR SUN'S LICENSORS BE LIABLE FOR ANY LOST
+ * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
+ * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
+ * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
+ * INABILITY TO USE THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
+ * DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
+ * OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
+ * HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
+ * WARRANTY OF FITNESS FOR SUCH USES.
+ */
+
+import java.io.IOException;
+
+import org.apache.tools.ant.BuildException;
+import org.apache.tools.ant.DirectoryScanner;
+import org.apache.tools.ant.Project;
+import org.apache.tools.ant.Task;
+import org.apache.tools.ant.taskdefs.Execute;
+import org.apache.tools.ant.taskdefs.LogStreamHandler;
+import org.apache.tools.ant.types.CommandlineJava;
+import org.apache.tools.ant.types.FileSet;
+import org.apache.tools.ant.types.Path;
+import org.apache.tools.ant.types.PatternSet;
+import org.apache.tools.ant.util.JavaEnvUtils;
+
+/**
+ * <p>An <a href="http://ant.apache.org">ANT</a> {@link org.apache.tools.ant.Task}
+ * for using {@link com.sun.gluegen.opengl.BuildStaticGLInfo}.</p>
+ * 
+ * <p>Usage:</p>
+ * <pre>
+    &lt;staticglgen package="[generated files package]" 
+                    headers="[file pattern of GL headers]"
+                    outputdir="[directory to output the generated files]" /&gt;
+ * </pre> 
+ *
+ * @author Rob Grzywinski <a href="mailto:[email protected]">[email protected]</a>
+ */
+// FIXME:  blow out javadoc
+public class StaticGLGenTask extends Task
+{
+    /**
+     * <p>The {@link com.sun.gluegen.opengl.BuildStaticGLInfo} classname.</p>
+     */
+    private static final String GL_GEN = "com.sun.gluegen.opengl.BuildStaticGLInfo";
+    
+    // =========================================================================
+    /**
+     * <p>The {@link org.apache.tools.ant.types.CommandlineJava} that is used
+     * to execute {@link com.sun.gluegen.opengl.BuildStaticGLInfo}.</p>
+     */
+    private CommandlineJava glgenCommandline;
+
+    // =========================================================================
+    /**
+     * <p>The package name for the generated files.</p>
+     */
+    private String packageName;
+
+    /**
+     * <p>The output directory.</p>
+     */
+    private String outputDirectory;
+    
+    /**
+     * <p>The {@link org.apache.tools.ant.types.FileSet} of GL headers.</p>
+     */
+    private FileSet headerSet = new FileSet();
+    
+    // =========================================================================
+    /**
+     * <p>Create and add the VM and classname to {@link org.apache.tools.ant.types.CommandlineJava}.</p>
+     */
+    public StaticGLGenTask()
+    {
+        // create the CommandlineJava that will be used to call BuildStaticGLInfo
+        glgenCommandline = new CommandlineJava();
+        
+        // set the VM and classname in the commandline
+        glgenCommandline.setVm(JavaEnvUtils.getJreExecutable("java"));
+        glgenCommandline.setClassname(GL_GEN);
+    }
+
+    // =========================================================================
+    // ANT getters and setters
+    /**
+     * <p>Set the package name for the generated files.  This is called by ANT.</p>
+     * 
+     * @param  packageName the name of the package for the generated files
+     */
+    public void setPackage(String packageName)
+    {
+        log( ("Setting package name to: " + packageName), Project.MSG_VERBOSE);
+        this.packageName = packageName;
+    }
+
+    /**
+     * <p>Set the output directory.  This is called by ANT.</p>
+     * 
+     * @param  directory the output directory
+     */
+    public void setOutputDir(String directory)
+    {
+        log( ("Setting output directory to: " + directory), 
+              Project.MSG_VERBOSE);
+        this.outputDirectory = directory;
+    }
+
+    /**
+     * <p>Add a header file to the list.  This is called by ANT for a nested
+     * element.</p>
+     * 
+     * @return {@link org.apache.tools.ant.types.PatternSet.NameEntry}
+     */
+    public PatternSet.NameEntry createHeader()
+    {
+        return headerSet.createInclude();
+    }
+
+    /**
+     * <p>Add a header file to the list.  This is called by ANT for a nested
+     * element.</p>
+     * 
+     * @return {@link org.apache.tools.ant.types.PatternSet.NameEntry}
+     */
+    public PatternSet.NameEntry createHeadersFile()
+    {
+        return headerSet.createIncludesFile();
+    }
+
+    /**
+     * <p>Set the set of header patterns.  Patterns may be separated by a comma
+     * or a space.  This is called by ANT.</p>
+     *
+     * @param  headers the string containing the header patterns
+     */
+    public void setHeaders(String headers)
+    {
+        headerSet.setIncludes(headers);
+    }
+
+    /**
+     * <p>Add an optional classpath that defines the location of {@link com.sun.gluegen.opengl.BuildStaticGLInfo}
+     * and <code>BuildStaticGLInfo</code>'s dependencies.</p>
+     * 
+     * @returns {@link org.apache.tools.ant.types.Path}
+     */
+     public Path createClasspath()
+     {
+         return glgenCommandline.createClasspath(project).createPath();
+     }
+
+    // =========================================================================
+    /**
+     * <p>Run the task.  This involves validating the set attributes, creating
+     * the command line to be executed and finally executing the command.</p>
+     * 
+     * @see  org.apache.tools.ant.Task#execute()
+     */
+    public void execute() 
+        throws BuildException 
+    {
+        // validate that all of the required attributes have been set
+        validateAttributes();
+        
+        // TODO:  add logic to determine if the generated file needs to be
+        //        regenerated
+        
+        // add the attributes to the CommandlineJava
+        addAttributes();
+
+        log(glgenCommandline.describeCommand(), Project.MSG_VERBOSE);
+        
+        // execute the command and throw on error
+        final int error = execute(glgenCommandline.getCommandline());
+        if(error == 1)
+            throw new BuildException( ("BuildStaticGLInfo returned: " + error), location);
+    }
+
+    /**
+     * <p>Ensure that the user specified all required arguments.</p>
+     * 
+     * @throws BuildException if there are required arguments that are not 
+     *         present or not valid
+     */
+    private void validateAttributes() 
+        throws BuildException
+    {
+        // validate that the package name is set
+        if(!isValid(packageName))
+            throw new BuildException("Invalid package name: " + packageName);
+
+        // validate that the output directory is set
+        // TODO:  switch to file and ensure that it exists
+        if(!isValid(outputDirectory))
+            throw new BuildException("Invalid output directory name: " + outputDirectory);
+            
+        // TODO:  validate that there are headers set
+    }
+
+    /**
+     * <p>Is the specified string valid?  A valid string is non-<code>null</code>
+     * and has a non-zero length.</p>
+     * 
+     * @param  string the string to be tested for validity
+     * @return <code>true</code> if the string is valid.  <code>false</code>
+     *         otherwise. 
+     */
+    private boolean isValid(String string)
+    {
+        // check for null
+        if(string == null)
+            return false;
+            
+        // ensure that the string has a non-zero length
+        // NOTE:  must trim() to remove leading and trailing whitespace
+        if(string.trim().length() < 1)
+            return false;
+            
+        // the string is valid
+        return true;
+    }
+
+    /**
+     * <p>Add all of the attributes to the command line.  They have already
+     * been validated.</p>
+     */
+    private void addAttributes()
+    {
+        // add the package name
+        glgenCommandline.createArgument().setValue(packageName);
+        
+        // add the output directory name
+        glgenCommandline.createArgument().setValue(outputDirectory);
+        
+        // add the header -files- from the FileSet
+        headerSet.setDir(getProject().getBaseDir());
+        DirectoryScanner directoryScanner = headerSet.getDirectoryScanner(getProject());
+        String[] directoryFiles = directoryScanner.getIncludedFiles();
+        for(int i=0; i<directoryFiles.length; i++)
+        {
+            glgenCommandline.createArgument().setValue(directoryFiles[i]);
+        }
+    }
+
+    /** 
+     * <p>Execute {@link com.sun.gluegen.opengl.BuildStaticGLInfo} in a 
+     * forked JVM.</p>
+     * 
+     * @throws BuildException
+     */
+    private int execute(String[] command) 
+        throws BuildException
+    {
+        // create the object that will perform the command execution
+        Execute execute = new Execute(new LogStreamHandler(this, Project.MSG_INFO,
+                                                           Project.MSG_WARN), 
+                                      null);
+                                      
+        // set the project and command line
+        execute.setAntRun(project);
+        execute.setCommandline(command);
+        
+        // execute the command
+        try
+        {
+            return execute.execute();
+        } catch(IOException ioe)
+        {
+            throw new BuildException(ioe, location);
+        }
+    }
+}