Take into account though, that you might not see all line breaks, as those could appear inside tags which you would not see in characters, but you could deduce those from the Locator information. By remembering the positions of the last event you could calculate the start position of the current one.
in addition to using the Locator information, which should give you a better picture of where in the document you actually are. You could start by doing some counting of your own in the characters(char, int, int) method of your ContentHandler by checking for line breaks, tabs etc. Just a quick warning from personal experience: Writing a wrapper around the InputStream you pass into the SAX parser is dangerous as you don't know when the SAX parser will report it's events based on what it has already read from the stream. involved, I guess this is too big of a project to post here, the implementation will also depend on your specific requirements. With all the potential encoding issues, Unicode characters etc. If you are after exact positions for tags, or want even more fine grained information about attributes, attribute content etc., you'd have to implement your own location provider.
#Where is the i button on the main interface sax and dotty driver#
Also, if you are dealing with multi-byte characters in your documents, e.g., Chinese or Japanese text, the position you get from the SAX driver is probably not what you want. So the short answer to the first part of your question is: No, the Locator does not provide information about the start location of a tag. For example, when lines contain combining character sequences, wide characters, surrogate pairs, or bi-directional text, the value may not correspond to the column in a text editor's display.Īccording to that specification, you will always get the position " of the first character after the text associated with the document event" based on best effort by the SAX driver. The return value from the method is intended only as an approximation for the sake of diagnostics it is not intended to provide sufficient information to edit the character content of the original XML document. To quote from the documentation of the getColumnNumber method (highlights added by me): Unfortunately, the Locator interface provided by the Java system library in the package does not allow for more detailed information about the documentation location by definition.
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