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## org.biojava.bio.program.tagvalue
Class TagDropper

    java.lang.Object
      org.biojava.bio.program.tagvalue.SimpleTagValueWrapper
          org.biojava.bio.program.tagvalue.TagDropper

All Implemented Interfaces:
  TagValueListener, TagValueWrapper

    public class TagDropper

extends SimpleTagValueWrapper

Silently drop all tags except those specified, and pass the rest onto a delegate.

Since:
  1.2
Author:
  Matthew Pocock

Constructor Summary
`TagDropper()`
`TagDropper(TagValueListener tvl)` Create a new TagDropper that will pass on all retained tags and values to tvl.

Method Summary
`void` | `addTag(Object tag)` Add a tag to retain.
`boolean` | `doRetain()` Find out if known tags are retained or dropped.
`void` | `endTag()` End the current tag.
`Set` | `getTags()` Get the complete set of tags that are currently recognized.
`void` | `removeTag(Object tag)` Remove a tag so that it will not be retained.
`void` | `setRetain(boolean retain)` Set wether known tags are to be retained or dropped.
`void` | `startTag(Object tag)` Start a new tag.
`void` | `value(TagValueContext ctxt, Object value)` A value has been seen.

Methods inherited from class org.biojava.bio.program.tagvalue.SimpleTagValueWrapper
`endRecord, getDelegate, setDelegate, startRecord`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### TagDropper

    public TagDropper()

### TagDropper

    public TagDropper(TagValueListener tvl)

  Create a new TagDropper that will pass on all retained tags and values to tvl. Initially, no tags will be retained.

  Parameters:
    `tvl` - the TagValueListener to inform of all surviving events

Method Detail

### addTag

    public void addTag(Object tag)

  Add a tag to retain.

  Parameters:
    `tag` - a tag that will be forwarded to the delegate

### removeTag

    public void removeTag(Object tag)

  Remove a tag so that it will not be retained.

  Parameters:
    `tag` - a tag that will not be forwarded to the delegate

### getTags

    public Set getTags()

  Get the complete set of tags that are currently recognized.

  Returns:
    the Set of known tags

### setRetain

    public void setRetain(boolean retain)

  Set wether known tags are to be retained or dropped.

  If retain is true, then all known tags will be passed on and all other tags will be discarded. If retain is true, then all known tags will be dropped and all others passed on.

  Parameters:
    `retain` - true if the tags are to be retained

### doRetain

    public boolean doRetain()

  Find out if known tags are retained or dropped.

  Returns:
    true if values are retained

### startTag

    public void startTag(Object tag)
                  throws ParserException

  Description copied from interface: `TagValueListener`
  Start a new tag.

  Specified by:
    `startTag` in interface `TagValueListener`
  Overrides:
    `startTag` in class `SimpleTagValueWrapper`
  Parameters:
    `tag` - the Object representing the new tag
  Throws:
    `ParserException` - if the tag could not be started

### endTag

    public void endTag()
                throws ParserException

  Description copied from interface: `TagValueListener`
  End the current tag.

  Specified by:
    `endTag` in interface `TagValueListener`
  Overrides:
    `endTag` in class `SimpleTagValueWrapper`
  Throws:
    `ParserException` - if the tag could not be ended

### value

    public void value(TagValueContext ctxt,
                      Object value)
               throws ParserException

  Description copied from interface: `TagValueListener`
  A value has been seen.

  Specified by:
    `value` in interface `TagValueListener`
  Overrides:
    `value` in class `SimpleTagValueWrapper`
  Parameters:
    `ctxt` - a TagValueContext that could be used to push a sub-document
    `value` - the value Object observed
  Throws:
    `ParserException` - if the value could not be processed

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