Package groovy.lang

Class GString

All Implemented Interfaces:
Buildable, GroovyObject, Writable,, java.lang.CharSequence, java.lang.Comparable
Direct Known Subclasses:

public abstract class GString
extends GroovyObjectSupport
implements java.lang.Comparable, java.lang.CharSequence, Writable, Buildable,
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.

James Strachan: The lovely name of this class was suggested by Jules Gosnell and was such a good idea, I couldn't resist :)

See Also:
Serialized Form
  • Field Summary

    Modifier and Type Field Description
    static GString EMPTY
    A GString containing a single empty String and no values.
    static java.lang.Object[] EMPTY_OBJECT_ARRAY  
    static java.lang.String[] EMPTY_STRING_ARRAY  
  • Constructor Summary

    Constructor Description
    GString​(java.lang.Object values)  
    GString​(java.lang.Object[] values)  
  • Method Summary

    Modifier and Type Method Description
    void build​(GroovyObject builder)  
    char charAt​(int index)  
    int compareTo​(java.lang.Object that)  
    boolean equals​(GString that)  
    boolean equals​(java.lang.Object that)  
    byte[] getBytes()  
    byte[] getBytes​(java.lang.String charset)  
    abstract java.lang.String[] getStrings()  
    java.lang.Object getValue​(int idx)  
    int getValueCount()  
    java.lang.Object[] getValues()  
    int hashCode()  
    java.lang.Object invokeMethod​(java.lang.String name, java.lang.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()  
    java.util.regex.Pattern negate()
    Turns a String into a regular expression pattern
    GString plus​(GString that)  
    GString plus​(java.lang.String that)  
    java.lang.CharSequence subSequence​(int start, int end)  
    java.lang.String toString() writeTo​( out)
    Writes this object to the given writer.

    Methods inherited from class groovy.lang.GroovyObjectSupport

    getMetaClass, setMetaClass

    Methods inherited from class java.lang.Object

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

    Methods inherited from interface java.lang.CharSequence

    chars, codePoints, isEmpty

    Methods inherited from interface groovy.lang.GroovyObject

    getProperty, setProperty
  • Field Details


      public static final java.lang.String[] EMPTY_STRING_ARRAY

      public static final java.lang.Object[] EMPTY_OBJECT_ARRAY
    • EMPTY

      public static final GString EMPTY
      A GString containing a single empty String and no values.
  • Constructor Details

    • GString

      public GString​(java.lang.Object values)
    • GString

      public GString​(java.lang.Object[] values)
  • Method Details

    • getStrings

      public abstract java.lang.String[] getStrings()
    • invokeMethod

      public java.lang.Object invokeMethod​(java.lang.String name, java.lang.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
      name - the name of the method to call
      args - the arguments to use for the method call
      the result of invoking the method
    • getValues

      public java.lang.Object[] getValues()
    • plus

      public GString plus​(GString that)
    • plus

      public GString plus​(java.lang.String that)
    • getValueCount

      public int getValueCount()
    • getValue

      public java.lang.Object getValue​(int idx)
    • toString

      public java.lang.String toString()
      Specified by:
      toString in interface java.lang.CharSequence
      toString in class java.lang.Object
    • writeTo

      public writeTo​( out) throws
      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
      out - the Writer to which this Writable should output its data.
      the Writer that was passed
      Throws: - if an error occurred while outputting data to the writer
    • build

      public void build​(GroovyObject builder)
      Specified by:
      build in interface Buildable
    • hashCode

      public int hashCode()
      hashCode in class java.lang.Object
    • equals

      public boolean equals​(java.lang.Object that)
      equals in class java.lang.Object
    • equals

      public boolean equals​(GString that)
    • compareTo

      public int compareTo​(java.lang.Object that)
      Specified by:
      compareTo in interface java.lang.Comparable
    • charAt

      public char charAt​(int index)
      Specified by:
      charAt in interface java.lang.CharSequence
    • length

      public int length()
      Specified by:
      length in interface java.lang.CharSequence
    • subSequence

      public java.lang.CharSequence subSequence​(int start, int end)
      Specified by:
      subSequence in interface java.lang.CharSequence
    • negate

      public java.util.regex.Pattern negate()
      Turns a String into a regular expression pattern
      the regular expression pattern
    • getBytes

      public byte[] getBytes()
    • getBytes

      public byte[] getBytes​(java.lang.String charset) throws