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Java Source Code / Java Documentation » Library » Apache commons configuration 1.4 src » org.apache.commons.configuration.tree

Source Cross Reference Class Diagram Java Document (Java Doc)

java.lang .Object

org.apache.commons.configuration.tree .DefaultConfigurationKey

DefaultConfigurationKey

public class DefaultConfigurationKey (Code)

A simple class that supports creation of and iteration on configuration keys supported by a DefaultExpressionEngine object.

For key creation the class works similar to a StringBuffer: There are several appendXXXX() methods with which single parts of a key can be constructed. All these methods return a reference to the actual object so they can be written in a chain. When using this methods the exact syntax for keys need not be known.

This class also defines a specialized iterator for configuration keys. With such an iterator a key can be tokenized into its single parts. For each part it can be checked whether it has an associated index.

Instances of this class are always associated with an instance of DefaultExpressionEngine, from which the current delimiters are obtained. So key creation and parsing is specific to this associated expression engine.

since:
   1.3
author:
   Oliver Heger
version:
   $Id: DefaultConfigurationKey.java 439648 2006-09-02 20:42:10Z oheger $

Inner Class :public class KeyIterator implements Iterator,Cloneable

Constructor Summary
public	DefaultConfigurationKey(DefaultExpressionEngine engine) Creates a new instance of `DefaultConfigurationKey` and sets the associated expression engine.
public	DefaultConfigurationKey(DefaultExpressionEngine engine, String key) Creates a new instance of `DefaultConfigurationKey` and sets the associated expression engine and an initial key.

Method Summary
public DefaultConfigurationKey	append(String property, boolean escape) Appends the name of a property to this key.
public DefaultConfigurationKey	append(String property) Appends the name of a property to this key.
public DefaultConfigurationKey	appendAttribute(String attr) Appends an attribute to this configuration key.
public DefaultConfigurationKey	appendIndex(int index) Appends an index to this configuration key.
public String	attributeName(String key) Extracts the name of the attribute from the given attribute key.
public String	constructAttributeKey(String key) Decorates the given key so that it represents an attribute.
public boolean	equals(Object c) Checks if two `ConfigurationKey` objects are equal.
public DefaultExpressionEngine	getExpressionEngine() Returns the associated default expression engine.
public int	hashCode() Returns the hash code for this object.
public boolean	isAttributeKey(String key) Tests if the specified key represents an attribute according to the current expression engine.
public KeyIterator	iterator() Returns an iterator for iterating over the single components of this configuration key.
public int	length() Returns the actual length of this configuration key.
public void	setExpressionEngine(DefaultExpressionEngine expressionEngine) Sets the associated expression engine.
public void	setLength(int len) Sets the new length of this configuration key.
public String	toString() Returns a string representation of this object.
public String	trim(String key) Removes delimiters at the beginning and the end of the specified key.
public String	trimLeft(String key) Removes leading property delimiters from the specified key.
public String	trimRight(String key) Removes trailing property delimiters from the specified key.

Constructor Detail

DefaultConfigurationKey
public DefaultConfigurationKey(DefaultExpressionEngine engine)(Code)
	Creates a new instance of `DefaultConfigurationKey` and sets the associated expression engine. Parameters: engine - the expression engine

DefaultConfigurationKey
public DefaultConfigurationKey(DefaultExpressionEngine engine, String key)(Code)
	Creates a new instance of `DefaultConfigurationKey` and sets the associated expression engine and an initial key. Parameters: engine - the expression engine Parameters: key - the key to be wrapped

Method Detail

append
public DefaultConfigurationKey append(String property, boolean escape)(Code)
	Appends the name of a property to this key. If necessary, a property delimiter will be added. If the boolean argument is set to true, property delimiters contained in the property name will be escaped. Parameters: property - the name of the property to be added Parameters: escape - a flag if property delimiters in the passed in property nameshould be escaped a reference to this object

append
public DefaultConfigurationKey append(String property)(Code)
	Appends the name of a property to this key. If necessary, a property delimiter will be added. Property delimiters in the given string will not be escaped. Parameters: property - the name of the property to be added a reference to this object

appendAttribute
public DefaultConfigurationKey appendAttribute(String attr)(Code)
	Appends an attribute to this configuration key. Parameters: attr - the name of the attribute to be appended a reference to this object

appendIndex
public DefaultConfigurationKey appendIndex(int index)(Code)
	Appends an index to this configuration key. Parameters: index - the index to be appended a reference to this object

attributeName
public String attributeName(String key)(Code)
	Extracts the name of the attribute from the given attribute key. This method removes the attribute markers - if any - from the specified key. Parameters: key - the attribute key the name of the corresponding attribute

constructAttributeKey
public String constructAttributeKey(String key)(Code)
	Decorates the given key so that it represents an attribute. Adds special start and end markers. The passed in string will be modified only if does not already represent an attribute. Parameters: key - the key to be decorated the decorated attribute key

equals
public boolean equals(Object c)(Code)
	Checks if two `ConfigurationKey` objects are equal. The method can be called with strings or other objects, too. Parameters: c - the object to compare a flag if both objects are equal

getExpressionEngine
public DefaultExpressionEngine getExpressionEngine()(Code)
	Returns the associated default expression engine. the associated expression engine

hashCode
public int hashCode()(Code)
	Returns the hash code for this object. the hash code

isAttributeKey
public boolean isAttributeKey(String key)(Code)
	Tests if the specified key represents an attribute according to the current expression engine. Parameters: key - the key to be checked true if this is an attribute key, false otherwise

iterator
public KeyIterator iterator()(Code)
	Returns an iterator for iterating over the single components of this configuration key. an iterator for this key

length
public int length()(Code)
	Returns the actual length of this configuration key. the length of this key

setExpressionEngine
public void setExpressionEngine(DefaultExpressionEngine expressionEngine)(Code)
	Sets the associated expression engine. Parameters: expressionEngine - the expression engine (must not be null)

setLength
public void setLength(int len)(Code)
	Sets the new length of this configuration key. With this method it is possible to truncate the key, e.g. to return to a state prior calling some `append()` methods. The semantic is the same as the `setLength()` method of `StringBuffer`. Parameters: len - the new length of the key

toString
public String toString()(Code)
	Returns a string representation of this object. This is the configuration key as a plain string. a string for this object

trim
public String trim(String key)(Code)
	Removes delimiters at the beginning and the end of the specified key. Parameters: key - the key the key with removed property delimiters

trimLeft
public String trimLeft(String key)(Code)
	Removes leading property delimiters from the specified key. Parameters: key - the key the key with removed leading property delimiters

trimRight
public String trimRight(String key)(Code)
	Removes trailing property delimiters from the specified key. Parameters: key - the key the key with removed trailing property delimiters

Methods inherited from java.lang.Object

native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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