org.apache.tools.ant.taskdefs
Class XmlProperty

java.lang.Object
  |
  +--org.apache.tools.ant.ProjectComponent
        |
        +--org.apache.tools.ant.Task
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              +--org.apache.tools.ant.taskdefs.XmlProperty

public class XmlProperty

extends Task

Loads property values from a valid XML file, generating the property names from the file's element and attribute names.

Example:

   <root-tag myattr="true">
     <inner-tag someattr="val">Text</inner-tag>
     <a2><a3><a4>false</a4></a3></a2>
     <x>x1</x>
     <x>x2</x>
   </root-tag>

this generates the following properties:

  root-tag(myattr)=true
  root-tag.inner-tag=Text
  root-tag.inner-tag(someattr)=val
  root-tag.a2.a3.a4=false
  root-tag.x=x1,x2
 

The collapseAttributes property of this task can be set to true (the default is false) which will instead result in the following properties (note the difference in names of properties corresponding to XML attributes):

  root-tag.myattr=true
  root-tag.inner-tag=Text
  root-tag.inner-tag.someattr=val
  root-tag.a2.a3.a4=false
  root-tag.x=x1,x2
 

Optionally, to more closely mirror the abilities of the Property task, a selected set of attributes can be treated specially. To enable this behavior, the "semanticAttributes" property of this task must be set to true (it defaults to false). If this attribute is specified, the following attributes take on special meaning (setting this to true implicitly sets collapseAttributes to true as well):

• value: Identifies a text value for a property.
• location: Identifies a file location for a property.
• id: Sets an id for a property
• refid: Sets a property to the value of another property based upon the provided id
• pathid: Defines a path rather than a property with the given id.

For example, with keepRoot = false, the following properties file:

 <root-tag>
   <build>
   <build folder="build">
     <classes id="build.classes" location="${build.folder}/classes"/>
     <reference refid="build.classes"/>
   </build>
   <compile>
     <classpath pathid="compile.classpath">
       <pathelement location="${build.classes}"/>
     </classpath>
   </compile>
   <run-time>
     <jars>*.jar</jars>
     <classpath pathid="run-time.classpath">
       <path refid="compile.classpath"/>
       <pathelement path="${run-time.jars}"/>
     </classpath>
   </run-time>
 </root-tag>
 

is equivalent to the following entries in a build file:

 <property name="build" location="build"/>
 <property name="build.classes" location="${build.location}/classes"/>
 <property name="build.reference" refid="build.classes"/>

 <property name="run-time.jars" value="*.jar/>

 <classpath id="compile.classpath">
   <pathelement location="${build.classes}"/>
 </classpath>

 <classpath id="run-time.classpath">
   <path refid="compile.classpath"/>
   <pathelement path="${run-time.jars}"/>
 </classpath>
 

This task requires the following attributes:

• file: The name of the file to load.

This task supports the following attributes:

• prefix: Optionally specify a prefix applied to all properties loaded. Defaults to an empty string.
• keepRoot: Indicate whether the root xml element is kept as part of property name. Defaults to true.
• validate: Indicate whether the xml file is validated. Defaults to false.
• collapseAttributes: Indicate whether attributes are stored in property names with parens or with period delimiters. Defaults to false, meaning properties are stored with parens (i.e., foo(attr)).
• semanticAttributes: Indicate whether attributes named "location", "value", "refid" and "path" are interpreted as ant properties. Defaults to false.
• rootDirectory: Indicate the directory to use as the root directory for resolving location properties. Defaults to the directory of the project using the task.
• includeSemanticAttribute: Indicate whether to include the semantic attribute ("location" or "value") as part of the property name. Defaults to false.

Field Summary

Fields inherited from class org.apache.tools.ant.Task

description, location, target, taskName, taskType, wrapper

Fields inherited from class org.apache.tools.ant.ProjectComponent

project

Constructor Summary

XmlProperty()
Constructor.

Method Summary

void	execute() Run the task.
protected boolean	getCollapseAttributes()
protected java.io.File	getFile()
protected boolean	getIncludeSementicAttribute()
protected boolean	getKeeproot()
protected java.lang.String	getPrefix()
protected java.io.File	getRootDirectory()
protected boolean	getSemanticAttributes()
protected boolean	getValidate()
void	init() Initializes the task.
java.lang.Object	processNode(org.w3c.dom.Node node, java.lang.String prefix, java.lang.Object container) Process the given node, adding any required attributes from this child node alone -- but not processing any children.
void	setCollapseAttributes(boolean collapseAttributes) flag to treat attributes as nested elements; optional, default false
void	setFile(java.io.File src) The XML file to parse; required.
void	setIncludeSemanticAttribute(boolean includeSemanticAttribute)
void	setKeeproot(boolean keepRoot) flag to include the xml root tag as a first value in the property name; optional, default is true
void	setPrefix(java.lang.String prefix) the prefix to prepend to each property
void	setRootDirectory(java.io.File rootDirectory)
void	setSemanticAttributes(boolean semanticAttributes)
void	setValidate(boolean validate) flag to validate the XML file; optional, default false

Methods inherited from class org.apache.tools.ant.Task

getDescription, getLocation, getOwningTarget, getRuntimeConfigurableWrapper, getTaskName, getTaskType, getWrapper, handleErrorFlush, handleErrorOutput, handleFlush, handleInput, handleOutput, isInvalid, log, log, maybeConfigure, perform, reconfigure, setDescription, setLocation, setOwningTarget, setRuntimeConfigurableWrapper, setTaskName, setTaskType

Methods inherited from class org.apache.tools.ant.ProjectComponent

getProject, setProject

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

XmlProperty

public XmlProperty()

Constructor.

Method Detail

init

public void init()

Initializes the task.

Overrides:

init in class Task

execute

public void execute()
             throws BuildException

Run the task.

Overrides:

execute in class Task

Throws:

BuildException - The exception raised during task execution.

To do:

validate the source file is valid before opening, print a better error message, add a verbose level log message listing the name of the file being loaded

processNode

public java.lang.Object processNode(org.w3c.dom.Node node,
                                    java.lang.String prefix,
                                    java.lang.Object container)

Process the given node, adding any required attributes from this child node alone -- but not processing any children.

Parameters:

node - the XML Node to parse

prefix - A string to prepend to any properties that get added by this node.

container - Optionally, an object that a parent node generated that this node might belong to. For example, this node could be within a node that generated a Path.

Returns:

the Object created by this node. Generally, this is either a String if this node resulted in setting an attribute, or a Path.

setFile

public void setFile(java.io.File src)

The XML file to parse; required.

Parameters:

src - the file to parse

setPrefix

public void setPrefix(java.lang.String prefix)

the prefix to prepend to each property

Parameters:

prefix - the prefix to prepend to each property

setKeeproot

public void setKeeproot(boolean keepRoot)

flag to include the xml root tag as a first value in the property name; optional, default is true

Parameters:

keepRoot - if true (default), include the xml root tag

setValidate

public void setValidate(boolean validate)

flag to validate the XML file; optional, default false

Parameters:

validate - if true validate the XML file, default false

setCollapseAttributes

public void setCollapseAttributes(boolean collapseAttributes)

flag to treat attributes as nested elements; optional, default false

Parameters:

collapseAttributes - if true treat attributes as nested elements

setSemanticAttributes

public void setSemanticAttributes(boolean semanticAttributes)

setRootDirectory

public void setRootDirectory(java.io.File rootDirectory)

setIncludeSemanticAttribute

public void setIncludeSemanticAttribute(boolean includeSemanticAttribute)

getFile

protected java.io.File getFile()

getPrefix

protected java.lang.String getPrefix()

getKeeproot

protected boolean getKeeproot()

getValidate

protected boolean getValidate()

getCollapseAttributes

protected boolean getCollapseAttributes()

getSemanticAttributes

protected boolean getSemanticAttributes()

getRootDirectory

protected java.io.File getRootDirectory()

getIncludeSementicAttribute

protected boolean getIncludeSementicAttribute()