netbeans.apache.org/src/content/wiki/DevFaqOpenReadOnly.asciidoc

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= DevFaqOpenReadOnly
:jbake-type: wiki
:jbake-tags: wiki, devfaq, needsreview
:jbake-status: published
:keywords: Apache NetBeans wiki DevFaqOpenReadOnly
:description: Apache NetBeans wiki DevFaqOpenReadOnly
:toc: left
:toc-title:
:syntax: true

=== How can I open a file in the editor in read-only mode?

You will need to make a special file editor which refuses to take a write lock:

[source,java]
----

public final class ROEditor extends DataEditorSupport {
    private ROEditor(DataObject d) {
        super(d, new E(d));
    }
    public ROEditor(FileObject fo) throws DataObjectNotFoundException {
        this(DataObject.find(fo));
    }
    private static final class E extends DataEditorSupport.Env {
        public E(DataObject d) {
            super(d);
        }
        protected FileObject getFile() {
            return getDataObject().getPrimaryFile();
        }
        protected FileLock takeLock() throws IOException {
            throw new IOException("No way!");
        }
    }
}
----

Demo of usage:

[source,java]
----

JFileChooser jfc = new JFileChooser();
if (jfc.showOpenDialog(null) != JFileChooser.APPROVE_OPTION) {
    return;
}
File f = jfc.getSelectedFile();
FileObject fo = FileUtil.toFileObject(f);
try {
    new ROEditor(fo).open();
} catch (DataObjectNotFoundException e) {
    e.printStackTrace();
}
----

Applies to: NetBeans 4.0 and newer

=== Apache Migration Information

The content in this page was kindly donated by Oracle Corp. to the
Apache Software Foundation.

This page was exported from link:http://wiki.netbeans.org/DevFaqOpenReadOnly[http://wiki.netbeans.org/DevFaqOpenReadOnly] , 
that was last modified by NetBeans user Vstejskal 
on 2010-06-16T13:28:46Z.


*NOTE:* This document was automatically converted to the AsciiDoc format on 2018-02-07, and needs to be reviewed.