Example usage for javax.tools FileObject openWriter

Introduction

In this page you can find the example usage for javax.tools FileObject openWriter.

Prototype

Writer openWriter() throws IOException;

Source Link

Document

Returns a Writer for this file object.

Usage

From source file:uniol.apt.compiler.AbstractServiceProcessor.java

/**
 * Function that writes a resource list into the class output directory.
 * Existing entries are preserved. This means that this function only ever adds new entries.
 * @param resourceName Name of the file in which the resource list should be saved.
 * @param entries Entries that should be added to the list.
 * @throws IOException In case I/O errors occur.
 *//*from  w  w w .j  ava2 s  .  c  om*/
protected void writeResourceList(String resourceName, Collection<String> entries) throws IOException {
    entries = new TreeSet<>(entries);

    // read already listed services
    try {
        FileObject fo = this.filer.getResource(StandardLocation.CLASS_OUTPUT, "", resourceName);
        try (InputStream is = fo.openInputStream()) {
            LineIterator lIter = IOUtils.lineIterator(is, "UTF-8");
            while (lIter.hasNext()) {
                String entry = lIter.next();
                entries.add(entry);
            }
        }
    } catch (IOException ex) {
        /* It's ok if the resource can't get found; we only skip reading it */
    }

    // write new list
    FileObject fo = this.filer.createResource(StandardLocation.CLASS_OUTPUT, "", resourceName);
    Writer writer = fo.openWriter();
    for (String entry : entries) {
        writer.append(entry + "\n");
    }
    writer.close();
}

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