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## org.biojava.bio.seq
Class CircularView

    java.lang.Object
      org.biojava.utils.Unchangeable
          org.biojava.bio.seq.impl.ViewSequence
              org.biojava.bio.seq.CircularView

All Implemented Interfaces:
  Serializable, Annotatable, FeatureHolder, RealizingFeatureHolder, Sequence, SymbolList, Changeable

    public class CircularView

extends ViewSequence

A circular view onto another Sequence object. The class allows for reinterpretation of locations and indices onto the sequence to allow for overlapping of the origin. The origin is assumed to be the first symbol. Future versions may support changing the origin.

In biojavax `RichSequences` intrinsicly know about circularity. No view is required. We strongly recommend using RichSequence if possible.

Since:
  1.1
Version:
  1.2
Author:
  Mark Schreiber
See Also:
  `RichSequence`, Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface org.biojava.bio.seq.FeatureHolder
`FeatureHolder.EmptyFeatureHolder`

Nested classes/interfaces inherited from interface org.biojava.bio.Annotatable
`Annotatable.AnnotationForwarder`

Nested classes/interfaces inherited from interface org.biojava.bio.seq.FeatureHolder
`FeatureHolder.EmptyFeatureHolder`

Field Summary

Fields inherited from interface org.biojava.bio.symbol.SymbolList
`EDIT, EMPTY_LIST`

Fields inherited from interface org.biojava.bio.seq.FeatureHolder
`EMPTY_FEATURE_HOLDER, FEATURES, SCHEMA`

Fields inherited from interface org.biojava.bio.Annotatable
`ANNOTATION`

Fields inherited from interface org.biojava.bio.seq.FeatureHolder
`EMPTY_FEATURE_HOLDER, FEATURES, SCHEMA`

Constructor Summary
`CircularView(Sequence seq)`
`CircularView(Sequence seq, FeatureRealizer fr)`

Method Summary
`Feature` | `createFeature(Feature.Template template)` Over rides ViewSequence to allow the use of locations that have coordinates outside of the sequence length (which are needed to describe locations that overlap the origin of a circular sequence).
`SymbolList` | `subList(int start, int end)` Over rides ViewSequence.
`String` | `subStr(int start, int end)` Over rides ViewSequence.
`Symbol` | `symbolAt(int index)` Over rides ViewSequence.

Methods inherited from class org.biojava.bio.seq.impl.ViewSequence
`containsFeature, countFeatures, edit, features, filter, filter, getAddedFeatures, getAlphabet, getAnnotation, getName, getSchema, getURN, iterator, length, realizeFeature, removeFeature, seqString, toList`

Methods inherited from class org.biojava.utils.Unchangeable
`addChangeListener, addChangeListener, addForwarder, getForwarders, getListeners, isUnchanging, removeChangeListener, removeChangeListener, removeForwarder`

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

Methods inherited from interface org.biojava.utils.Changeable
`addChangeListener, addChangeListener, isUnchanging, removeChangeListener, removeChangeListener`

Methods inherited from interface org.biojava.utils.Changeable
`addChangeListener, addChangeListener, isUnchanging, removeChangeListener, removeChangeListener`

Methods inherited from interface org.biojava.utils.Changeable
`addChangeListener, addChangeListener, isUnchanging, removeChangeListener, removeChangeListener`

Methods inherited from interface org.biojava.utils.Changeable
`addChangeListener, addChangeListener, isUnchanging, removeChangeListener, removeChangeListener`

Constructor Detail

### CircularView

    public CircularView(Sequence seq,
                        FeatureRealizer fr)

### CircularView

    public CircularView(Sequence seq)

Method Detail

### symbolAt

    public Symbol symbolAt(int index)

  Over rides ViewSequence. Allows any integer index, positive or negative to return a symbol via the equation `val = (val % length);` Note that base zero is the base immediately before base 1 which is of course the last base of the sequence.

  Specified by:
    `symbolAt` in interface `SymbolList`
  Overrides:
    `symbolAt` in class `ViewSequence`
  Parameters:
    `index` - the index of the `Symbol` requested.
  Returns:
    the `Symbol` specified by the `index.`

### subStr

    public String subStr(int start,
                         int end)

  Over rides ViewSequence. Allows any integer index, positive or negative to return a symbol via the equation `val = (val % length);`

  Will return a linear String which can, if nescessary, span the origin.

  Specified by:
    `subStr` in interface `SymbolList`
  Overrides:
    `subStr` in class `ViewSequence`
  Parameters:
    `start` - the index of the fist base
    `end` - the index of the last base
  Returns:
    a `String` representation of the tokenized `Symbol`s

### createFeature

    public Feature createFeature(Feature.Template template)
                          throws ChangeVetoException,
                                 BioException

  Over rides ViewSequence to allow the use of locations that have coordinates outside of the sequence length (which are needed to describe locations that overlap the origin of a circular sequence).

  Specified by:
    `createFeature` in interface `FeatureHolder`
  Overrides:
    `createFeature` in class `ViewSequence`
  Parameters:
    `template` - the template of the feature to be created.
  Returns:
    the feature created you can use the template of the returned feature to create another of the same type.
  Throws:
    `BioException` - if a non circular location is added that exceeds the 'boundaries' of the sequence.
    `ChangeVetoException` - if the sequence is locked.
  Since:
    1.2

### subList

    public SymbolList subList(int start,
                              int end)

  Over rides ViewSequence. Allows any integer index, positive or negative to return a symbol via the equation `index = ((index -1) % length)+1`

  Will return a linear SymbolList which can ,if nescessary, span the origin.

  Specified by:
    `subList` in interface `SymbolList`
  Overrides:
    `subList` in class `ViewSequence`
  Parameters:
    `start` - the first base of the sublist
    `end` - the last base of the sublist
  Returns:
    a `SymbolList` containing the `Symbols` from `start` to `end` inclusive

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