groovy.lang

Class GString

java.lang.Object

groovy.lang.GroovyObjectSupport

groovy.lang.GString

All Implemented Interfaces:

Buildable, GroovyObject, Writable, java.io.Serializable, java.lang.CharSequence, java.lang.Comparable

Direct Known Subclasses:

GStringImpl

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

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.
static java.lang.Object[]	EMPTY_OBJECT_ARRAY
static java.lang.String[]	EMPTY_STRING_ARRAY

Constructor Summary

Constructors

Constructor and Description
GString(java.lang.Object values)
GString(java.lang.Object[] values)

Method Summary

Modifier and Type	Method and 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()
java.io.Writer	writeTo(java.io.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

Methods inherited from interface java.lang.CharSequence

chars, codePoints

Field Detail

EMPTY_STRING_ARRAY

public static final java.lang.String[] EMPTY_STRING_ARRAY

EMPTY_OBJECT_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 Detail

GString

public GString(java.lang.Object values)

GString

public GString(java.lang.Object[] values)

Method Detail

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

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 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

Overrides:

toString in class java.lang.Object

writeTo

public java.io.Writer writeTo(java.io.Writer out)
                       throws java.io.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:

java.io.IOException - 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()

Overrides:

hashCode in class java.lang.Object

equals

public boolean equals(java.lang.Object that)

Overrides:

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

Returns:

the regular expression pattern

getBytes

public byte[] getBytes()

getBytes

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

Throws:

java.io.UnsupportedEncodingException