org.apache.karaf.util
Class Properties

java.lang.Object
  java.util.AbstractMap<java.lang.String,java.lang.String>
      org.apache.karaf.util.Properties

All Implemented Interfaces:

java.util.Map<java.lang.String,java.lang.String>

public class Properties
extends java.util.AbstractMap<java.lang.String,java.lang.String>

Enhancement of the standard Properties managing the maintain of comments, etc.

Author:

gnodet, jbonofre

Nested Class Summary

protected static class	Properties.Layout TODO
static class	Properties.PropertiesReader This class is used to read properties lines.
static class	Properties.PropertiesWriter This class is used to write properties lines.

Nested classes/interfaces inherited from class java.util.AbstractMap

java.util.AbstractMap.SimpleEntry<K,V>, java.util.AbstractMap.SimpleImmutableEntry<K,V>

Nested classes/interfaces inherited from interface java.util.Map

java.util.Map.Entry<K,V>

Constructor Summary

Properties()

Properties(java.io.File location)

Method Summary

void	clear()
static boolean	contains(char[] array, char valueToFind) Checks if the value is in the given array.
java.util.Set<java.util.Map.Entry<java.lang.String,java.lang.String>>	entrySet()
protected static java.lang.String	escapeJava(java.lang.String str) Escapes the characters in a String using Java String rules.
java.util.List<java.lang.String>	getFooter() Return the comment footer.
java.util.List<java.lang.String>	getHeader() Return the comment header.
protected static java.lang.String	hex(char ch) Returns an upper case hexadecimal String for the given character.
void	load(java.io.File location)
void	load(java.io.InputStream is)
void	load(java.io.Reader reader)
void	load(java.net.URL location)
protected void	loadLayout(java.io.Reader in) Reads a properties file and stores its internal structure.
static void	performSubstitution(java.util.Map<java.lang.String,java.lang.String> properties) Perform substitution on a property set
java.lang.String	put(java.lang.String key, java.lang.String value)
java.lang.String	remove(java.lang.Object key)
void	save()
void	save(java.io.File location)
void	save(java.io.OutputStream os)
void	save(java.io.Writer writer)
protected void	saveLayout(java.io.Writer out) Writes the properties file to the given writer, preserving as much of its structure as possible.
void	setFooter(java.util.List<java.lang.String> footer) Set the comment footer.
void	setHeader(java.util.List<java.lang.String> header) Set the comment header.
static java.lang.String	substVars(java.lang.String val, java.lang.String currentKey, java.util.Map<java.lang.String,java.lang.String> cycleMap, java.util.Map<java.lang.String,java.lang.String> configProps) This method performs property variable substitution on the specified value.
protected static java.lang.String	unescapeJava(java.lang.String str) Unescapes any Java literals found in the String to a Writer.

Methods inherited from class java.util.AbstractMap

clone, containsKey, containsValue, equals, get, hashCode, isEmpty, keySet, putAll, size, toString, values

Methods inherited from class java.lang.Object

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

Constructor Detail

Properties

public Properties()

Properties

public Properties(java.io.File location)
           throws java.io.IOException

Throws:

java.io.IOException

Method Detail

load

public void load(java.io.File location)
          throws java.io.IOException

Throws:

java.io.IOException

load

public void load(java.net.URL location)
          throws java.io.IOException

Throws:

java.io.IOException

load

public void load(java.io.InputStream is)
          throws java.io.IOException

Throws:

java.io.IOException

load

public void load(java.io.Reader reader)
          throws java.io.IOException

Throws:

java.io.IOException

save

public void save()
          throws java.io.IOException

Throws:

java.io.IOException

save

public void save(java.io.File location)
          throws java.io.IOException

Throws:

java.io.IOException

save

public void save(java.io.OutputStream os)
          throws java.io.IOException

Throws:

java.io.IOException

save

public void save(java.io.Writer writer)
          throws java.io.IOException

Throws:

java.io.IOException

entrySet

public java.util.Set<java.util.Map.Entry<java.lang.String,java.lang.String>> entrySet()

Specified by:

entrySet in interface java.util.Map<java.lang.String,java.lang.String>

Specified by:

entrySet in class java.util.AbstractMap<java.lang.String,java.lang.String>

put

public java.lang.String put(java.lang.String key,
                            java.lang.String value)

Specified by:

put in interface java.util.Map<java.lang.String,java.lang.String>

Overrides:

put in class java.util.AbstractMap<java.lang.String,java.lang.String>

remove

public java.lang.String remove(java.lang.Object key)

Specified by:

remove in interface java.util.Map<java.lang.String,java.lang.String>

Overrides:

remove in class java.util.AbstractMap<java.lang.String,java.lang.String>

clear

public void clear()

Specified by:

clear in interface java.util.Map<java.lang.String,java.lang.String>

Overrides:

clear in class java.util.AbstractMap<java.lang.String,java.lang.String>

getHeader

public java.util.List<java.lang.String> getHeader()

Return the comment header.

Returns:

the comment header

setHeader

public void setHeader(java.util.List<java.lang.String> header)

Set the comment header.

Parameters:

header - the header to use

getFooter

public java.util.List<java.lang.String> getFooter()

Return the comment footer.

Returns:

the comment footer

setFooter

public void setFooter(java.util.List<java.lang.String> footer)

Set the comment footer.

Parameters:

footer - the footer to use

loadLayout

protected void loadLayout(java.io.Reader in)
                   throws java.io.IOException

Reads a properties file and stores its internal structure. The found properties will be added to the associated configuration object.

Parameters:

in - the reader to the properties file

Throws:

java.io.IOException - if an error occurs

saveLayout

protected void saveLayout(java.io.Writer out)
                   throws java.io.IOException

Writes the properties file to the given writer, preserving as much of its structure as possible.

Parameters:

out - the writer

Throws:

java.io.IOException - if an error occurs

unescapeJava

protected static java.lang.String unescapeJava(java.lang.String str)

Unescapes any Java literals found in the String to a Writer.

This is a slightly modified version of the StringEscapeUtils.unescapeJava() function in commons-lang that doesn't drop escaped separators (i.e '\,').

Parameters:

str - the String to unescape, may be null

Returns:

the processed string

Throws:

java.lang.IllegalArgumentException - if the Writer is null

escapeJava

protected static java.lang.String escapeJava(java.lang.String str)

Escapes the characters in a String using Java String rules.

Deals correctly with quotes and control-chars (tab, backslash, cr, ff, etc.)

So a tab becomes the characters '\\' and 't'.

The only difference between Java strings and JavaScript strings is that in JavaScript, a single quote must be escaped.

Example:

 input string: He didn't say, "Stop!"
 output string: He didn't say, \"Stop!\"
 

Parameters:

str - String to escape values in, may be null

Returns:

String with escaped values, null if null string input

hex

protected static java.lang.String hex(char ch)

Returns an upper case hexadecimal String for the given character.

Parameters:

ch - The character to convert.

Returns:

An upper case hexadecimal String

contains

public static boolean contains(char[] array,
                               char valueToFind)

Checks if the value is in the given array.

The method returns false if a null array is passed in.

Parameters:

array - the array to search through

valueToFind - the value to find

Returns:

true if the array contains the object

performSubstitution

public static void performSubstitution(java.util.Map<java.lang.String,java.lang.String> properties)

Perform substitution on a property set

Parameters:

properties - the property set to perform substitution on

substVars

public static java.lang.String substVars(java.lang.String val,
                                         java.lang.String currentKey,
                                         java.util.Map<java.lang.String,java.lang.String> cycleMap,
                                         java.util.Map<java.lang.String,java.lang.String> configProps)
                                  throws java.lang.IllegalArgumentException

This method performs property variable substitution on the specified value. If the specified value contains the syntax ${<prop-name>}, where <prop-name> refers to either a configuration property or a system property, then the corresponding property value is substituted for the variable placeholder. Multiple variable placeholders may exist in the specified value as well as nested variable placeholders, which are substituted from inner most to outer most. Configuration properties override system properties.

Parameters:

val - The string on which to perform property substitution.

currentKey - The key of the property being evaluated used to detect cycles.

cycleMap - Map of variable references used to detect nested cycles.

configProps - Set of configuration properties.

Returns:

The value of the specified string after system property substitution.

Throws:

java.lang.IllegalArgumentException - If there was a syntax error in the property placeholder syntax or a recursive variable reference.