package org.biojava.bio.program.tagvalue; import org.biojava.utils.ParserException; /** * Partician multiple values for a tag into their own tag groups. * *
With tag-value files, it is not uncommon for information about logical * blocks of data to be encoded in the values as well as tags of the document. * For example, in swissprot entries, the comment block may be punctuated by * lines that clearly seperate one logical comment from another, but there may * be no change in the pattern of tags to indicate this. Some fields, such as * alternate names in Enzyme, are a ist of values but some of the values are * longer than a single line. Each value is terminated with a period ".", but * again there is no way from the tags to know the logical grouping.
* *This class provides callbacks to allow event streams to be re-written * so that they contain this information. A single CC tag with multiple values * can be re-written as multiple CC tags with values for each logical comment. * This is done by presenting each value to an instance of Agregator.Observer * that indicates if the current value signals the end of a logcal block. *
* * @since 1.4 * @author Matthew Pocock */ public class MultiTagger extends SimpleTagValueWrapper { private final BoundaryFinder observer; // state // boolean inTag; boolean seenValues; Object tag; public MultiTagger(TagValueListener listener, BoundaryFinder observer) { super(listener); this.observer = observer; } public BoundaryFinder getBoundaryFinder() { return observer; } public void startTag(Object tag) throws ParserException { this.tag = tag; inTag = false; seenValues = false; } public void value(TagValueContext ctxt, Object value) throws ParserException { seenValues = true; if(observer.isBoundaryStart(value)) { if(inTag) { super.endTag(); } super.startTag(tag); if(!observer.dropBoundaryValues()) { super.value(ctxt, value); } inTag = true; } else if(observer.isBoundaryEnd(value)) { if(!inTag) { super.startTag(tag); } if(!observer.dropBoundaryValues()) { super.value(ctxt, value); } super.endTag(); inTag = false; } else { if(!inTag) { super.startTag(tag); inTag = true; } super.value(ctxt, value); } } public void endTag() throws ParserException { if(inTag) { super.endTag(); } else if(!seenValues) { // bounary condition where there are no values associated with a tag super.startTag(tag); super.endTag(); } inTag = false; seenValues = false; } }