nz.ac.auckland.ptjava.internal.builder.BuildDeltaVisitor.java Source code

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Here is the source code for nz.ac.auckland.ptjava.internal.builder.BuildDeltaVisitor.java

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/*
 * Copyright (C) 2010 Christopher Chong, Oliver Sinnen and others.
 * 
 * This program is free software; you can redistribute it and/or modify 
 * it under the terms of the GNU General Public License as published by 
 * the Free Software Foundation; either version 3 of the License, or 
 * (at your option) any later version.
 * 
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License 
 * along with this program; if not, see <http://www.gnu.org/licenses>.
 * 
 * Additional permission under GNU GPL version 3 section 7
 * 
 * If you modify this Program, or any covered work, by linking or 
 * combining it with Eclipse (or a modified version of that library), 
 * containing parts covered by the terms of the Eclipse Public License - v1.0, 
 * the licensors of this Program grant you additional permission to 
 * convey the resulting work. {Corresponding Source for a non-source form 
 * of such a combination shall include the source code for the parts 
 * of Eclipse used as well as that of the covered work.}
 * 
 */
package nz.ac.auckland.ptjava.internal.builder;

import nz.ac.auckland.ptjava.builder.MarkerManager;
import nz.ac.auckland.ptjava.builder.PTJavaFileBuilder;

import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.IResourceDelta;
import org.eclipse.core.resources.IResourceDeltaVisitor;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jdt.core.JavaCore;

/**
 * The visitor for incremental project builds. Instances of this can be used to 
 * visit all files that have been modified since the last save.
 *
 */
public class BuildDeltaVisitor implements IResourceDeltaVisitor {
    /**
     * The Constructor. Currently does nothing.
     */
    public BuildDeltaVisitor() {

    }

    /**
     * Visits each resource node in the delta tree, starting at the workspace root.
     * If the node in the tree is a .ptjava file, invokes {@link PTJavaFileBuilder#invokeCompiler(String, IResource)}
     * on the file.
     * 
     * Does not visit the Java output location (default: bin/) if such a location is specified in the Java Project 
     * by {@link IJavaProject#getOutputLocation()}.
     * 
     */
    @Override
    public boolean visit(IResourceDelta delta) throws CoreException {

        //  get the resource this change represented
        IResource resource = delta.getResource();

        String relPath = resource.getFullPath().toString();

        int index = relPath.lastIndexOf('/');
        if (index == -1) {
            return false;
        }
        relPath = relPath.substring(0, index);

        //  After removing the last '/', we should be left with a path like:
        //  "/project_name" or "/project_name/bin", depending on whether the User wanted 
        //  separate src and bin folders or not.
        //  Test if we have the first, or second case
        if (relPath.lastIndexOf('/') > 0) {
            //  latter case
            IJavaProject javaProj = JavaCore.create(resource.getProject());
            if (javaProj == null) {
                return false;
            }
            String outputPath = javaProj.getOutputLocation().toString();

            //  .ptjava files tend to get created in the bin directory when
            //  Java builder is invoked.
            //  we don't want to build anything in the bin directory, or subdirectories
            if (relPath.equals(outputPath)) {
                return false;
            }
        }

        //  find the absolute file path to the resource
        //  this way, files can be built even if they are not in workspace directory
        String fullPath = resource.getLocationURI().getPath();

        if (fullPath.endsWith(".ptjava")) {
            //  delete the resource markers
            MarkerManager.getInstance().deletePTJavaMarkers(resource);

            //  invoke the compiler
            PTJavaFileBuilder.invokeCompiler(fullPath, delta.getResource());
        }
        //  return true to visit children as well
        return true;
    }
}