org.apache.lucene.analysis.tokenattributes

## Class CharTermAttributeImpl

- java.lang.Object
- - org.apache.lucene.util.AttributeImpl
  - - org.apache.lucene.analysis.tokenattributes.CharTermAttributeImpl

- All Implemented Interfaces:
    Appendable, CharSequence, Cloneable, CharTermAttribute, TermToBytesRefAttribute, Attribute
  Direct Known Subclasses:
    PackedTokenAttributeImpl

      public class CharTermAttributeImpl
      extends AttributeImpl
      implements CharTermAttribute, TermToBytesRefAttribute, Cloneable

  Default implementation of `CharTermAttribute`.

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `protected BytesRefBuilder` | `builder` May be used by subclasses to convert to different charsets / encodings for implementing `getBytesRef()`.

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `CharTermAttributeImpl()` Initialize this attribute with empty term text

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `CharTermAttribute` | `append(char c)`
    `CharTermAttribute` | `append(CharSequence csq)`
    `CharTermAttribute` | `append(CharSequence csq, int start, int end)`
    `CharTermAttribute` | `append(CharTermAttribute ta)` Appends the contents of the other `CharTermAttribute` to this character sequence.
    `CharTermAttribute` | `append(String s)` Appends the specified `String` to this character sequence.
    `CharTermAttribute` | `append(StringBuilder s)` Appends the specified `StringBuilder` to this character sequence.
    `char[]` | `buffer()` Returns the internal termBuffer character array which you can then directly alter.
    `char` | `charAt(int index)`
    `void` | `clear()` Clears the values in this AttributeImpl and resets it to its default value.
    `CharTermAttributeImpl` | `clone()` In most cases the clone is, and should be, deep in order to be able to properly capture the state of all attributes.
    `void` | `copyBuffer(char[] buffer, int offset, int length)` Copies the contents of buffer, starting at offset for length characters, into the termBuffer array.
    `void` | `copyTo(AttributeImpl target)` Copies the values from this Attribute into the passed-in target attribute.
    `boolean` | `equals(Object other)`
    `BytesRef` | `getBytesRef()` Retrieve this attribute's BytesRef.
    `int` | `hashCode()`
    `int` | `length()`
    `void` | `reflectWith(AttributeReflector reflector)` This method is for introspection of attributes, it should simply add the key/values this attribute holds to the given `AttributeReflector`.
    `char[]` | `resizeBuffer(int newSize)` Grows the termBuffer to at least size newSize, preserving the existing content.
    `CharTermAttribute` | `setEmpty()` Sets the length of the termBuffer to zero.
    `CharTermAttribute` | `setLength(int length)` Set number of valid characters (length of the term) in the termBuffer array.
    `CharSequence` | `subSequence(int start, int end)`
    `String` | `toString()` Returns solely the term text as specified by the `CharSequence` interface.

    - ### Methods inherited from class org.apache.lucene.util.AttributeImpl

      `end, reflectAsString`

    - ### Methods inherited from class java.lang.Object

      `finalize, getClass, notify, notifyAll, wait, wait, wait`

    - ### Methods inherited from interface java.lang.CharSequence

      `chars, codePoints`

- - ### Field Detail

    - #### builder

          protected BytesRefBuilder builder

      May be used by subclasses to convert to different charsets / encodings for implementing `getBytesRef()`.

  - ### Constructor Detail

    - #### CharTermAttributeImpl

          public CharTermAttributeImpl()

      Initialize this attribute with empty term text

  - ### Method Detail

    - #### copyBuffer

          public final void copyBuffer(char[] buffer,
                                       int offset,
                                       int length)

      Description copied from interface: `CharTermAttribute`
      Copies the contents of buffer, starting at offset for length characters, into the termBuffer array.
      Specified by:
        `copyBuffer` in interface `CharTermAttribute`
      Parameters:
        `buffer` - the buffer to copy
        `offset` - the index in the buffer of the first character to copy
        `length` - the number of characters to copy

    - #### buffer

          public final char[] buffer()

      Description copied from interface: `CharTermAttribute`
      Returns the internal termBuffer character array which you can then directly alter. If the array is too small for your token, use `CharTermAttribute.resizeBuffer(int)` to increase it. After altering the buffer be sure to call `CharTermAttribute.setLength(int)` to record the number of valid characters that were placed into the termBuffer.

      NOTE: The returned buffer may be larger than the valid `CharSequence.length()`.

      Specified by:
        `buffer` in interface `CharTermAttribute`

    - #### resizeBuffer

          public final char[] resizeBuffer(int newSize)

      Description copied from interface: `CharTermAttribute`
      Grows the termBuffer to at least size newSize, preserving the existing content.
      Specified by:
        `resizeBuffer` in interface `CharTermAttribute`
      Parameters:
        `newSize` - minimum size of the new termBuffer
      Returns:
        newly created termBuffer with `length >= newSize`

    - #### setLength

          public final CharTermAttribute setLength(int length)

      Description copied from interface: `CharTermAttribute`
      Set number of valid characters (length of the term) in the termBuffer array. Use this to truncate the termBuffer or to synchronize with external manipulation of the termBuffer. Note: to grow the size of the array, use `CharTermAttribute.resizeBuffer(int)` first.
      Specified by:
        `setLength` in interface `CharTermAttribute`
      Parameters:
        `length` - the truncated length

    - #### setEmpty

          public final CharTermAttribute setEmpty()

      Description copied from interface: `CharTermAttribute`
      Sets the length of the termBuffer to zero. Use this method before appending contents using the `Appendable` interface.
      Specified by:
        `setEmpty` in interface `CharTermAttribute`

    - #### getBytesRef

          public BytesRef getBytesRef()

      Description copied from interface: `TermToBytesRefAttribute`
      Retrieve this attribute's BytesRef. The bytes are updated from the current term. The implementation may return a new instance or keep the previous one.
      Specified by:
        `getBytesRef` in interface `TermToBytesRefAttribute`
      Returns:
        a BytesRef to be indexed (only stays valid until token stream gets incremented)

    - #### length

          public final int length()

      Specified by:
        `length` in interface `CharSequence`

    - #### charAt

          public final char charAt(int index)

      Specified by:
        `charAt` in interface `CharSequence`

    - #### subSequence

          public final CharSequence subSequence(int start,
                                                int end)

      Specified by:
        `subSequence` in interface `CharSequence`

    - #### append

          public final CharTermAttribute append(CharSequence csq)

      Specified by:
        `append` in interface `Appendable`
      Specified by:
        `append` in interface `CharTermAttribute`

    - #### append

          public final CharTermAttribute append(CharSequence csq,
                                                int start,
                                                int end)

      Specified by:
        `append` in interface `Appendable`
      Specified by:
        `append` in interface `CharTermAttribute`

    - #### append

          public final CharTermAttribute append(char c)

      Specified by:
        `append` in interface `Appendable`
      Specified by:
        `append` in interface `CharTermAttribute`

    - #### append

          public final CharTermAttribute append(String s)

      Description copied from interface: `CharTermAttribute`
      Appends the specified `String` to this character sequence.

      The characters of the `String` argument are appended, in order, increasing the length of this sequence by the length of the argument. If argument is `null`, then the four characters `"null"` are appended.

      Specified by:
        `append` in interface `CharTermAttribute`

    - #### append

          public final CharTermAttribute append(StringBuilder s)

      Description copied from interface: `CharTermAttribute`
      Appends the specified `StringBuilder` to this character sequence.

      The characters of the `StringBuilder` argument are appended, in order, increasing the length of this sequence by the length of the argument. If argument is `null`, then the four characters `"null"` are appended.

      Specified by:
        `append` in interface `CharTermAttribute`

    - #### append

          public final CharTermAttribute append(CharTermAttribute ta)

      Description copied from interface: `CharTermAttribute`
      Appends the contents of the other `CharTermAttribute` to this character sequence.

      The characters of the `CharTermAttribute` argument are appended, in order, increasing the length of this sequence by the length of the argument. If argument is `null`, then the four characters `"null"` are appended.

      Specified by:
        `append` in interface `CharTermAttribute`

    - #### hashCode

          public int hashCode()

      Overrides:
        `hashCode` in class `Object`

    - #### clear

          public void clear()

      Description copied from class: `AttributeImpl`
      Clears the values in this AttributeImpl and resets it to its default value. If this implementation implements more than one Attribute interface it clears all.
      Specified by:
        `clear` in class `AttributeImpl`

    - #### clone

          public CharTermAttributeImpl clone()

      Description copied from class: `AttributeImpl`
      In most cases the clone is, and should be, deep in order to be able to properly capture the state of all attributes.
      Overrides:
        `clone` in class `AttributeImpl`

    - #### equals

          public boolean equals(Object other)

      Overrides:
        `equals` in class `Object`

    - #### toString

          public String toString()

      Returns solely the term text as specified by the `CharSequence` interface.

      This method changed the behavior with Lucene 3.1, before it returned a String representation of the whole term with all attributes. This affects especially the `Token` subclass.

      Specified by:
        `toString` in interface `CharSequence`
      Overrides:
        `toString` in class `Object`

    - #### reflectWith

          public void reflectWith(AttributeReflector reflector)

      Description copied from class: `AttributeImpl`
      This method is for introspection of attributes, it should simply add the key/values this attribute holds to the given `AttributeReflector`.

      Implementations look like this (e.g. for a combined attribute implementation):

             public void reflectWith(AttributeReflector reflector) {
               reflector.reflect(CharTermAttribute.class, "term", term());
               reflector.reflect(PositionIncrementAttribute.class, "positionIncrement", getPositionIncrement());
             }

      If you implement this method, make sure that for each invocation, the same set of `Attribute` interfaces and keys are passed to `AttributeReflector.reflect(java.lang.Class<? extends org.apache.lucene.util.Attribute>, java.lang.String, java.lang.Object)` in the same order, but possibly different values. So don't automatically exclude e.g. `null` properties!

      Specified by:
        `reflectWith` in class `AttributeImpl`
      See Also:
        `AttributeImpl.reflectAsString(boolean)`

    - #### copyTo

          public void copyTo(AttributeImpl target)

      Description copied from class: `AttributeImpl`
      Copies the values from this Attribute into the passed-in target attribute. The target implementation must support all the Attributes this implementation supports.
      Specified by:
        `copyTo` in class `AttributeImpl`

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