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## org.biojava.bio.seq.impl
Class LazyFilterFeatureHolder

    java.lang.Object
      org.biojava.bio.seq.impl.LazyFilterFeatureHolder

All Implemented Interfaces:
  FeatureHolder, Changeable

    public class LazyFilterFeatureHolder

extends Object
implements FeatureHolder

FeatureHolder which lazily applies a specified filter to another FeatureHolder. This means that when you use a second filter to query the LazyFilterFeatureHolder, the underlying holder receives a single `filter` request with the two queries ANDed together.

Since:
  1.3
Author:
  Thomas Down

Nested Class Summary

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

Field Summary

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

Constructor Summary
`LazyFilterFeatureHolder(FeatureHolder fh, FeatureFilter ff)`

Method Summary
`void` | `addChangeListener(ChangeListener cl)` Add a listener that will be informed of all changes.
`void` | `addChangeListener(ChangeListener cl, ChangeType ct)` Add a listener that will be informed of changes of a given type.
`boolean` | `containsFeature(Feature f)` Check if the feature is present in this holder.
`int` | `countFeatures()` Count how many features are contained.
`Feature` | `createFeature(Feature.Template temp)` Create a new Feature, and add it to this FeatureHolder.
`Iterator` | `features()` Iterate over the features in no well defined order.
`FeatureHolder` | `filter(FeatureFilter ff)` Query this set of features using a supplied `FeatureFilter`.
`FeatureHolder` | `filter(FeatureFilter ff, boolean recurse)` Return a new FeatureHolder that contains all of the children of this one that passed the filter fc.
`protected ChangeSupport` | `getChangeSupport()`
`FeatureFilter` | `getSchema()` Return a schema-filter for this `FeatureHolder`.
`protected boolean` | `hasListeners()`
`boolean` | `isUnchanging(ChangeType ct)` A particular ChangeType can never be raised by this Changeable.
`void` | `removeChangeListener(ChangeListener cl)` Remove a listener that was interested in all types of changes.
`void` | `removeChangeListener(ChangeListener cl, ChangeType ct)` Remove a listener that was interested in a specific types of changes.
`void` | `removeFeature(Feature f)` Remove a feature from this FeatureHolder.

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

Constructor Detail

### LazyFilterFeatureHolder

    public LazyFilterFeatureHolder(FeatureHolder fh,
                                   FeatureFilter ff)

Method Detail

### features

    public Iterator features()

  Description copied from interface: `FeatureHolder`
  Iterate over the features in no well defined order.

  Specified by:
    `features` in interface `FeatureHolder`
  Returns:
    an Iterator

### countFeatures

    public int countFeatures()

  Description copied from interface: `FeatureHolder`
  Count how many features are contained.

  Specified by:
    `countFeatures` in interface `FeatureHolder`
  Returns:
    a positive integer or zero, equal to the number of features contained

### containsFeature

    public boolean containsFeature(Feature f)

  Description copied from interface: `FeatureHolder`
  Check if the feature is present in this holder.

  Specified by:
    `containsFeature` in interface `FeatureHolder`
  Parameters:
    `f` - the Feature to check
  Returns:
    true if f is in this set

### filter

    public FeatureHolder filter(FeatureFilter ff)

  Description copied from interface: `FeatureHolder`
  Query this set of features using a supplied `FeatureFilter`.

  Specified by:
    `filter` in interface `FeatureHolder`
  Parameters:
    `ff` - the `FeatureFilter` to apply.
  Returns:
    all features in this container which match `filter`.

### filter

    public FeatureHolder filter(FeatureFilter ff,
                                boolean recurse)

  Description copied from interface: `FeatureHolder`
  Return a new FeatureHolder that contains all of the children of this one that passed the filter fc. This method is scheduled for deprecation. Use the 1-arg filter instead.

  Specified by:
    `filter` in interface `FeatureHolder`
  Parameters:
    `ff` - the FeatureFilter to apply
    `recurse` - true if all features-of-features should be scanned, and a single flat collection of features returned, or false if just immediate children should be filtered.

### createFeature

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

  Description copied from interface: `FeatureHolder`
  Create a new Feature, and add it to this FeatureHolder. This method will generally only work on Sequences, and on some Features which have been attached to Sequences.

  Specified by:
    `createFeature` in interface `FeatureHolder`
  Throws:
    `ChangeVetoException` - if this FeatureHolder does not support creation of new features, or if the change was vetoed
    `BioException` - if something went wrong during creating the feature

### removeFeature

    public void removeFeature(Feature f)
                       throws ChangeVetoException,
                              BioException

  Description copied from interface: `FeatureHolder`
  Remove a feature from this FeatureHolder.

  Specified by:
    `removeFeature` in interface `FeatureHolder`
  Throws:
    `ChangeVetoException` - if this FeatureHolder does not support feature removal or if the change was vetoed
    `BioException` - if there was an error removing the feature

### hasListeners

    protected boolean hasListeners()

### getChangeSupport

    protected ChangeSupport getChangeSupport()

### addChangeListener

    public final void addChangeListener(ChangeListener cl)

  Description copied from interface: `Changeable`
  Add a listener that will be informed of all changes.

  Specified by:
    `addChangeListener` in interface `Changeable`
  Parameters:
    `cl` - the ChangeListener to add

### addChangeListener

    public final void addChangeListener(ChangeListener cl,
                                        ChangeType ct)

  Description copied from interface: `Changeable`
  Add a listener that will be informed of changes of a given type.

  Specified by:
    `addChangeListener` in interface `Changeable`
  Parameters:
    `cl` - the ChangeListener
    `ct` - the ChangeType it is to be informed of

### removeChangeListener

    public final void removeChangeListener(ChangeListener cl)

  Description copied from interface: `Changeable`
  Remove a listener that was interested in all types of changes.

  Specified by:
    `removeChangeListener` in interface `Changeable`
  Parameters:
    `cl` - a ChangeListener to remove

### removeChangeListener

    public final void removeChangeListener(ChangeListener cl,
                                           ChangeType ct)

  Description copied from interface: `Changeable`
  Remove a listener that was interested in a specific types of changes.

  Specified by:
    `removeChangeListener` in interface `Changeable`
  Parameters:
    `cl` - a ChangeListener to remove
    `ct` - the ChangeType that it was interested in

### isUnchanging

    public boolean isUnchanging(ChangeType ct)

  Description copied from interface: `Changeable`

  A particular ChangeType can never be raised by this Changeable.

  If this returns true, then it is guaranteed that change events of this type (and all child types) can never under any circumstances be fired by this Changeable instance. If it returns false, that does not mean that this type of event will or even can be raised, but that it is worth registering listeners incase.

  Specified by:
    `isUnchanging` in interface `Changeable`
  Parameters:
    `ct` - the ChangeType to check
  Returns:
    true if ChangeEvents of this type are guaranteed to never be fired

### getSchema

    public FeatureFilter getSchema()

  Description copied from interface: `FeatureHolder`
  Return a schema-filter for this `FeatureHolder`. This is a filter which all `Feature`s immediately contained by this `FeatureHolder` will match. It need not directly match their child features, but it can (and should!) provide information about them using `FeatureFilter.OnlyChildren` filters. In cases where there is no feature hierarchy, this can be indicated by including `FeatureFilter.leaf` in the schema filter.

  For the truly non-informative case, it is possible to return `FeatureFilter.all`. However, it is almost always possible to provide slightly more information that this. For example, `Sequence` objects should, at a minimum, return `FeatureFilter.top_level`. `Feature` objects should, as a minimum, return `FeatureFilter.ByParent(new FeatureFilter.ByFeature(this))`.

  Specified by:
    `getSchema` in interface `FeatureHolder`
  Returns:
    the schema filter

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