diff --git a/pmd-eclipse/src/net/sourceforge/pmd/eclipse/builder/PMDBuilder.java b/pmd-eclipse/src/net/sourceforge/pmd/eclipse/builder/PMDBuilder.java
new file mode 100644
index 0000000000..0c113ab736
--- /dev/null
+++ b/pmd-eclipse/src/net/sourceforge/pmd/eclipse/builder/PMDBuilder.java
@@ -0,0 +1,114 @@
+package net.sourceforge.pmd.eclipse.builder;
+
+import java.util.Map;
+
+import net.sourceforge.pmd.eclipse.PMDConstants;
+import net.sourceforge.pmd.eclipse.PMDDeltaVisitor;
+import net.sourceforge.pmd.eclipse.PMDPlugin;
+import net.sourceforge.pmd.eclipse.PMDVisitor;
+import org.eclipse.core.resources.IProject;
+import org.eclipse.core.resources.IResourceDelta;
+import org.eclipse.core.resources.IResourceVisitor;
+import org.eclipse.core.resources.IncrementalProjectBuilder;
+import org.eclipse.core.runtime.CoreException;
+import org.eclipse.core.runtime.IProgressMonitor;
+
+/**
+ * Implements an incremental builder for PMD. Use PMDVisitor and PMDDeltaVisitor
+ * to process each file of the project.
+ * 
+ * @author Philippe Herlin
+ * @version $Revision$
+ * 
+ * $Log$
+ * Revision 1.1  2003/03/17 23:35:59  phherlin
+ * first version
+ * adding nature and incremental builder
+ *
+ */
+public class PMDBuilder extends IncrementalProjectBuilder {
+    public static final String PMD_BUILDER = "net.sourceforge.pmd.eclipse.pmdBuilder";
+
+    /**
+     * @see org.eclipse.core.internal.events.InternalBuilder#build(int, Map, IProgressMonitor)
+     */
+    protected IProject[] build(int kind, Map args, IProgressMonitor monitor) throws CoreException {
+        IProject[] result = null;
+
+        if (kind == AUTO_BUILD) {
+            result = buildAuto(args, monitor);
+        } else if (kind == FULL_BUILD) {
+            result = buildFull(args, monitor);
+        } else if (kind == INCREMENTAL_BUILD) {
+            result = buildIncremental(args, monitor);
+        }
+
+        return result;
+    }
+
+    /**
+     * Automatic build
+     * @param args build parameters
+     * @param monitor progress indicator
+     * @return IProject[] related projects list
+     * @throws CoreException
+     */
+    private IProject[] buildAuto(Map args, IProgressMonitor monitor) throws CoreException {
+        return buildIncremental(args, monitor);
+    }
+
+    /**
+     * Full build
+     * @param args build parameters
+     * @param monitor progress indicator
+     * @return IProject[] related projects list
+     * @throws CoreException
+     */
+    private IProject[] buildFull(Map args, IProgressMonitor monitor) throws CoreException {
+        IProject currentProject = getProject();
+        if (currentProject != null) {
+            processProjectFiles(currentProject, monitor);
+        }
+
+        return null;
+    }
+
+    /**
+     * Incremental build
+     * @param args build parameters
+     * @param monitor progress indicator
+     * @return IProject[] related projects list
+     * @throws CoreException
+     */
+    private IProject[] buildIncremental(Map args, IProgressMonitor monitor) throws CoreException {
+        IProject result[] = null;
+
+        IProject currentProject = getProject();
+        if (currentProject != null) {
+            IResourceDelta resourceDelta = getDelta(currentProject);
+            if (resourceDelta != null) {
+                monitor.beginTask(PMDPlugin.getDefault().getMessage(PMDConstants.MSGKEY_PMD_PROCESSING), IProgressMonitor.UNKNOWN);
+                PMDDeltaVisitor visitor = new PMDDeltaVisitor(monitor);
+                resourceDelta.accept(visitor);
+                monitor.done();
+            } else {
+                result = buildFull(args, monitor);
+            }
+        }
+
+        return result;
+    }
+
+    /**
+     * Process all files in the project
+     * @param project the project
+     * @param monitor a progress indicator
+     */
+    private void processProjectFiles(IProject project, IProgressMonitor monitor) throws CoreException {
+        monitor.beginTask(PMDPlugin.getDefault().getMessage(PMDConstants.MSGKEY_PMD_PROCESSING), IProgressMonitor.UNKNOWN);
+        IResourceVisitor visitor = new PMDVisitor(monitor);
+        project.accept(visitor);
+        monitor.done();
+    }
+
+}
diff --git a/pmd-eclipse/src/net/sourceforge/pmd/eclipse/builder/PMDNature.java b/pmd-eclipse/src/net/sourceforge/pmd/eclipse/builder/PMDNature.java
new file mode 100644
index 0000000000..ae1e1ffc14
--- /dev/null
+++ b/pmd-eclipse/src/net/sourceforge/pmd/eclipse/builder/PMDNature.java
@@ -0,0 +1,90 @@
+package net.sourceforge.pmd.eclipse.builder;
+
+import org.eclipse.core.resources.ICommand;
+import org.eclipse.core.resources.IProject;
+import org.eclipse.core.resources.IProjectDescription;
+import org.eclipse.core.resources.IProjectNature;
+import org.eclipse.core.runtime.CoreException;
+
+/**
+ * A project nature for PMD. Add a PMDBuilder to a project
+ * 
+ * @author Philippe Herlin
+ * @version $Revision$
+ * 
+ * $Log$
+ * Revision 1.1  2003/03/17 23:35:59  phherlin
+ * first version
+ * adding nature and incremental builder
+ *
+ */
+public class PMDNature implements IProjectNature {
+    public static final String PMD_NATURE = "net.sourceforge.pmd.eclipse.pmdNature";
+    private IProject project;
+
+    /**
+     * @see org.eclipse.core.resources.IProjectNature#configure()
+     */
+    public void configure() throws CoreException {
+        IProjectDescription description = project.getDescription();
+        ICommand[] commands = description.getBuildSpec();
+        if (!pmdBuilderFound(commands)) {
+            ICommand pmdBuilderCommand = description.newCommand();
+            pmdBuilderCommand.setBuilderName(PMDBuilder.PMD_BUILDER);
+            ICommand[] newCommands = new ICommand[commands.length + 1];
+            System.arraycopy(commands, 0, newCommands, 0, commands.length);
+            newCommands[commands.length] = pmdBuilderCommand;
+            description.setBuildSpec(newCommands);
+            project.setDescription(description, null);
+        }
+    }
+
+    /**
+     * @see org.eclipse.core.resources.IProjectNature#deconfigure()
+     */
+    public void deconfigure() throws CoreException {
+        IProjectDescription description = project.getDescription();
+        ICommand[] commands = description.getBuildSpec();
+        if (pmdBuilderFound(commands)) {
+            ICommand[] newCommands = new ICommand[commands.length - 1];
+            for (int i = 0, j = 0; i < commands.length; i++) {
+                if (!commands[i].getBuilderName().equals(PMDBuilder.PMD_BUILDER)) {
+                    newCommands[j++] = commands[i];
+                }
+            }
+            description.setBuildSpec(newCommands);
+            project.setDescription(description, null);
+        }
+    }
+
+    /**
+     * @see org.eclipse.core.resources.IProjectNature#getProject()
+     */
+    public IProject getProject() {
+        return project;
+    }
+
+    /**
+     * @see org.eclipse.core.resources.IProjectNature#setProject(IProject)
+     */
+    public void setProject(IProject project) {
+        this.project = project;
+    }
+
+    /**
+     * Check if PMD builder is allready in command list
+     * @param commands a command list
+     */
+    private boolean pmdBuilderFound(ICommand[] commands) {
+        boolean flFound = false;
+        for (int i = 0; i < commands.length; i++) {
+            if (commands[i].getBuilderName().equals(PMDBuilder.PMD_BUILDER)) {
+                flFound = true;
+                break;
+            }
+        }
+
+        return flFound;
+    }
+
+}