XmlProperty (Apache Ant API)
Keywords: org.apache.tools.ant.taskdefs.XmlProperty class

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## org.apache.tools.ant.taskdefs
Class XmlProperty

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

All Implemented Interfaces:
  java.lang.Cloneable

    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
`target, taskName, taskType, wrapper`

Fields inherited from class org.apache.tools.ant.ProjectComponent
`description, location, project`

Constructor Summary
`XmlProperty()` Constructor.

Method Summary
`void` | `addConfigured(ResourceCollection a)` Set the source resource.
`void` | `addConfiguredXMLCatalog(XMLCatalog catalog)` add an XMLCatalog as a nested element; optional.
`void` | `execute()` Run the task.
`protected boolean` | `getCollapseAttributes()`
`java.lang.String` | `getDelimiter()` Get the current delimiter.
`protected org.xml.sax.EntityResolver` | `getEntityResolver()`
`protected java.io.File` | `getFile()`
`protected boolean` | `getIncludeSementicAttribute()`
`protected boolean` | `getKeeproot()`
`protected java.lang.String` | `getPrefix()`
`protected Resource` | `getResource()`
`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` | `setDelimiter(java.lang.String delimiter)` Sets a new delimiter.
`void` | `setFile(java.io.File src)` The XML file to parse; required.
`void` | `setIncludeSemanticAttribute(boolean includeSemanticAttribute)` Include the semantic attribute name as part of the property name.
`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)` The directory to use for resolving file references.
`void` | `setSemanticAttributes(boolean semanticAttributes)` Attribute to enable special handling of attributes - see ant manual.
`void` | `setSrcResource(Resource src)` The resource to pack; required.
`void` | `setValidate(boolean validate)` flag to validate the XML file; optional, default false
`protected boolean` | `supportsNonFileResources()` Whether this task can deal with non-file resources.

Methods inherited from class org.apache.tools.ant.Task
`bindToOwner, getOwningTarget, getRuntimeConfigurableWrapper, getTaskName, getTaskType, getWrapper, handleErrorFlush, handleErrorOutput, handleFlush, handleInput, handleOutput, isInvalid, log, log, log, log, maybeConfigure, perform, reconfigure, setOwningTarget, setRuntimeConfigurableWrapper, setTaskName, setTaskType`

Methods inherited from class org.apache.tools.ant.ProjectComponent
`clone, getDescription, getLocation, getProject, setDescription, setLocation, setProject`

Methods inherited from class java.lang.Object
`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`

### getEntityResolver

    protected org.xml.sax.EntityResolver getEntityResolver()

  Returns:
    the xmlCatalog as the entityresolver.

### 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

### setSrcResource

    public void setSrcResource(Resource src)

  The resource to pack; required.

  Parameters:
    `src` - resource to expand

### addConfigured

    public void addConfigured(ResourceCollection a)

  Set the source resource.

  Parameters:
    `a` - the resource to pack as a single element Resource collection.

### 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)

  Attribute to enable special handling of attributes - see ant manual.

  Parameters:
    `semanticAttributes` - if true enable the special handling.

### setRootDirectory

    public void setRootDirectory(java.io.File rootDirectory)

  The directory to use for resolving file references. Ignored if semanticAttributes is not set to true.

  Parameters:
    `rootDirectory` - the directory.

### setIncludeSemanticAttribute

    public void setIncludeSemanticAttribute(boolean includeSemanticAttribute)

  Include the semantic attribute name as part of the property name. Ignored if semanticAttributes is not set to true.

  Parameters:
    `includeSemanticAttribute` - if true include the sematic attribute name.

### addConfiguredXMLCatalog

    public void addConfiguredXMLCatalog(XMLCatalog catalog)

  add an XMLCatalog as a nested element; optional.

  Parameters:
    `catalog` - the XMLCatalog to use

### getFile

    protected java.io.File getFile()

  Returns:
    the file attribute.

### getResource

    protected Resource getResource()

  Returns:
    the resource.

### getPrefix

    protected java.lang.String getPrefix()

  Returns:
    the prefix attribute.

### getKeeproot

    protected boolean getKeeproot()

  Returns:
    the keeproot attribute.

### getValidate

    protected boolean getValidate()

  Returns:
    the validate attribute.

### getCollapseAttributes

    protected boolean getCollapseAttributes()

  Returns:
    the collapse attributes attribute.

### getSemanticAttributes

    protected boolean getSemanticAttributes()

  Returns:
    the semantic attributes attribute.

### getRootDirectory

    protected java.io.File getRootDirectory()

  Returns:
    the root directory attribute.

### getIncludeSementicAttribute

    protected boolean getIncludeSementicAttribute()

  Returns:
    the include semantic attribute.

### supportsNonFileResources

    protected boolean supportsNonFileResources()

  Whether this task can deal with non-file resources.

  This implementation returns true only if this task is <xmlproperty>. Any subclass of this class that also wants to support non-file resources needs to override this method. We need to do so for backwards compatibility reasons since we can't expect subclasses to support resources.

  Returns:
    true for this task.
  Since:
    Ant 1.7

### getDelimiter

    public java.lang.String getDelimiter()

  Get the current delimiter.

  Returns:
    delimiter

### setDelimiter

    public void setDelimiter(java.lang.String delimiter)

  Sets a new delimiter.

  Parameters:
    `delimiter` - new value
  Since:
    Ant 1.7.1

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