GWTRecompileCheck.java

package edu.washington.cs.oneswarm.ant;

import java.io.File;
import java.text.ParsePosition;
import java.text.SimpleDateFormat;
import java.util.Date;

import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.Task;

public class GWTRecompileCheck extends Task {

    String directory = null;
    String basedir = "";
    String lastBuilt = null;
    boolean done = false;

    @Override
    public void execute() throws BuildException {

        if (directory == null) {
            throw new BuildException("Directory not specified.");
        }

        if (lastBuilt == null) {
            log("No prior built record, building...");
            doBuild(null);
            return;
        }

        // If the OSMessages.java file is missing, we definitely need to
        // recompile.
        File osMessages = new File(
                basedir
                        + "oneswarm_gwt_ui/src/edu/washington/cs/oneswarm/ui/gwt/client/i18n/OSMessages.java");
        if (osMessages.exists() == false) {
            log("OSMessages.java not found at: " + osMessages.getAbsolutePath() + " ... rebuilding");
            doBuild(null);
            return;
        }

        File dirFile = new File(basedir + directory);
        if (dirFile.isDirectory() == false) {
            throw new BuildException("Provided GWT source root is not a directory!");
        }

        log("Scanning directory: " + directory + " for changes since " + lastBuilt);

        Date last = new SimpleDateFormat("MM/dd/yyyy HH:mm").parse(lastBuilt, new ParsePosition(0));

        recursiveScan(new File(basedir
                + "oneswarm_gwt_ui/src/edu/washington/cs/oneswarm/ui/gwt/OneSwarmGWT.gwt.xml"),
                last);
        recursiveScan(dirFile, last);
    }

    private void recursiveScan(File f, Date thresh) {

        log(f.getAbsolutePath(), Project.MSG_DEBUG);

        if (f.isFile()
                && (f.getName().endsWith(".java") || f.getName().endsWith(".properties") || f
                        .getName().endsWith(".xml"))) {
            if (thresh.before(new Date(f.lastModified()))) {
                doBuild(f);
            }
        }

        if (!done && f.isDirectory()) {

            if (f.getName().startsWith(".svn")) {
                return;
            }

            for (File kid : f.listFiles()) {
                recursiveScan(kid, thresh);

                if (done) {
                    break;
                }
            }
        }
    }

    private void doBuild(File f) {
        getProject().setProperty("gwt.recompile", "true");
        done = true;
        log("Performing build");
        if (f != null) {
            log(f.getName() + " modified " + (new Date(f.lastModified())));
        }
    }

    public void setDirectory(String directory) {
        this.directory = directory;
    }

    public void setBaseDir(String basedir) {
        this.basedir = basedir;
    }

    public void setLastBuild(String lastBuilt) {
        if (lastBuilt.startsWith("${")) {
            return;
        }
        this.lastBuilt = lastBuilt;
    }
}