groovy.lang

## Class GString

- java.lang.Object
- - groovy.lang.GroovyObjectSupport
  - - groovy.lang.GString

- All Implemented Interfaces:
    Buildable, GroovyObject, Writable, Serializable, CharSequence, Comparable
  Direct Known Subclasses:
    GStringImpl

      public abstract class GString
      extends GroovyObjectSupport
      implements Comparable, CharSequence, Writable, Buildable, Serializable

  Represents a String which contains embedded values such as "hello there ${user} how are you?" which can be evaluated lazily. Advanced users can iterate over the text and values to perform special processing, such as for performing SQL operations, the values can be substituted for ? and the actual value objects can be bound to a JDBC statement. The lovely name of this class was suggested by Jules Gosnell and was such a good idea, I couldn't resist :)
  Version:
    $Revision: 20589 $
  Author:
    James Strachan
  See Also:
    Serialized Form

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static GString` | `EMPTY` A GString containing a single empty String and no values.

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `GString(Object values)`
    `GString(Object[] values)`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `build(GroovyObject builder)`
    `char` | `charAt(int index)`
    `int` | `compareTo(Object that)`
    `boolean` | `equals(GString that)`
    `boolean` | `equals(Object that)`
    `abstract String[]` | `getStrings()`
    `Object` | `getValue(int idx)`
    `int` | `getValueCount()`
    `Object[]` | `getValues()`
    `int` | `hashCode()`
    `Object` | `invokeMethod(String name, Object args)` Overloaded to implement duck typing for Strings so that any method that can't be evaluated on this object will be forwarded to the toString() object instead.
    `int` | `length()`
    `Pattern` | `negate()` Turns a String into a regular expression pattern
    `GString` | `plus(GString that)`
    `GString` | `plus(String that)`
    `CharSequence` | `subSequence(int start, int end)`
    `String` | `toString()`
    `Writer` | `writeTo(Writer out)` Writes this object to the given writer.

    - ### Methods inherited from class groovy.lang.GroovyObjectSupport

      `getMetaClass, getProperty, setMetaClass, setProperty`

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

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

- - ### Field Detail

    - #### EMPTY

          public static final GString EMPTY

      A GString containing a single empty String and no values.

  - ### Constructor Detail

    - #### GString

          public GString(Object values)

    - #### GString

          public GString(Object[] values)

  - ### Method Detail

    - #### getStrings

          public abstract String[] getStrings()

    - #### invokeMethod

          public Object invokeMethod(String name,
                            Object args)

      Overloaded to implement duck typing for Strings so that any method that can't be evaluated on this object will be forwarded to the toString() object instead.
      Specified by:
        `invokeMethod` in interface `GroovyObject`
      Overrides:
        `invokeMethod` in class `GroovyObjectSupport`
      Parameters:
        `name` - the name of the method to call
        `args` - the arguments to use for the method call
      Returns:
        the result of invoking the method

    - #### getValues

          public Object[] getValues()

    - #### plus

          public GString plus(GString that)

    - #### plus

          public GString plus(String that)

    - #### getValueCount

          public int getValueCount()

    - #### getValue

          public Object getValue(int idx)

    - #### toString

          public String toString()

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

    - #### writeTo

          public Writer writeTo(Writer out)
                         throws IOException

      Description copied from interface: `Writable`

      Writes this object to the given writer.

      This is used to defer content creation until the point when it is streamed to the output destination. Oftentimes, content will be defined but not necessarily created (as is may be the case with a Closure definition.) In that case, the output is then 'deferred' to the point when it is serialized to the writer. This class may be used whenever an object should be responsible for creating its own textual representation, but creating the entire output as a single String would be inefficient (such as outputting a multi-gigabyte XML document.)

      Specified by:
        `writeTo` in interface `Writable`
      Parameters:
        `out` - the Writer to which this Writable should output its data.
      Returns:
        the Writer that was passed
      Throws:
        `IOException` - if an error occurred while outputting data to the writer

    - #### build

          public void build(GroovyObject builder)

      Specified by:
        `build` in interface `Buildable`

    - #### equals

          public boolean equals(Object that)

      Overrides:
        `equals` in class `Object`

    - #### equals

          public boolean equals(GString that)

    - #### hashCode

          public int hashCode()

      Overrides:
        `hashCode` in class `Object`

    - #### compareTo

          public int compareTo(Object that)

      Specified by:
        `compareTo` in interface `Comparable`

    - #### charAt

          public char charAt(int index)

      Specified by:
        `charAt` in interface `CharSequence`

    - #### length

          public int length()

      Specified by:
        `length` in interface `CharSequence`

    - #### subSequence

          public CharSequence subSequence(int start,
                                 int end)

      Specified by:
        `subSequence` in interface `CharSequence`

    - #### negate

          public Pattern negate()

      Turns a String into a regular expression pattern
      Returns:
        the regular expression pattern