com.myjavatools.xml
Class BasicXmlData

java.lang.Object
  com.myjavatools.xml.BasicXmlData

All Implemented Interfaces:

XmlData

public class BasicXmlData

extends java.lang.Object

implements XmlData

Nested Class Summary

static class	BasicXmlData.Expression An abstract class that stores an expression used in XmlData search/filtering.
static class	BasicXmlData.Policy Class Policy defines three different casting policies.

Nested classes inherited from class com.myjavatools.xml.XmlData

XmlData.Condition

Field Summary

static java.lang.Class

XmlDataClass

Constructor Summary

BasicXmlData()
Default constructor.

BasicXmlData(java.io.File in)
Creates an instance from the data read from a file.

BasicXmlData(java.io.InputStream in)
Creates an instance from the data read from input stream.

BasicXmlData(java.lang.String type)
Creates an instance of BasicXmlData of specified type.

BasicXmlData(java.lang.String type, java.lang.String value)
Creates an instance of specified type and with the specified value.

BasicXmlData(java.lang.String type, java.lang.String value, org.xml.sax.AttributeList attributes)
Creates an instance of specified type, with the specified value, attributes that are listed in the provided AttributeList.

BasicXmlData(java.lang.String type, java.lang.String value, org.xml.sax.AttributeList attributes, BasicXmlData[] kids)
Creates an instance of specified type, with the specified value, attributes that are listed in the provided AttributeList, and the kids that are listed in the provided array of XmlData.

BasicXmlData(java.lang.String type, java.lang.String value, org.xml.sax.AttributeList attributes, java.util.Collection kids)
Creates an instance of specified type, with the specified value, attributes that are listed in the provided AttributeList, and the kids that are listed in the provided collection.

BasicXmlData(java.lang.String type, java.lang.String value, BasicXmlData[] kids)
Creates an instance of specified type, with the specified value and the kids that are listed in the provided array.

BasicXmlData(java.lang.String type, java.lang.String value, java.util.Collection kids)
Creates an instance of specified type, with the specified value and the kids that are listed in the provided collection.

BasicXmlData(java.lang.String type, java.lang.String value, java.util.Map attributes, java.util.Collection kids)
Creates an instance of specified type, with the specified value, attributes that are listed in the provided map (name -> value), and the kids that are listed in the provided collection.

BasicXmlData(java.lang.String type, java.lang.String value, java.util.Map attributes, java.util.Map byType)
Creates an instance of specified type, with the specified value, attributes that are listed in the provided Map (name -> value), and the kids that are listed in the provided Map, type->Collection.

BasicXmlData(java.lang.String type, java.lang.String value, java.lang.String[] attributes)
Creates an instance of specified type, with the specified value and the attributes that are listed in the provided array as name-value pairs.

BasicXmlData(java.lang.String type, java.lang.String value, java.lang.String[] attributes, BasicXmlData[] kids)
Creates an instance of BasicXmlData of specified type, with the specified value, attributes that are listed in the provided array as name-value pairs, and the kids that are listed in the provided array of XmlData.

BasicXmlData(java.lang.String type, java.lang.String value, java.lang.String[] attributes, java.util.Collection kids)
Creates an instance of specified type, with the specified value, attributes that are listed in the provided array as name-value pairs, and the kids that are listed in the provided collection.

BasicXmlData(java.net.URL url)
Creates an instance from the data read from URL.

BasicXmlData(XmlData org)
Creates an instance from another XmlData object (use clone() to get a real deep copy).

Method Summary

XmlData	addKid(XmlData kid) Adds a kid to the set of kids.
void	addKids(java.util.Collection kids) Adds all XmlData elements from given Collection to the set of kids, skipping elements that are not XmlData.
XmlData	cast(java.util.Map typemap, BasicXmlData.Policy policy) Casts XmlData and its kids, recursively, to specified classes, according to the typemap.
XmlData	cast(java.lang.String packageName, BasicXmlData.Policy policy) Casts XmlData and its kids, recursively, to classes in specified package.
boolean	castKids(java.lang.String type, java.lang.Class clazz) Casts kids of specified type to a specified class (actually replacing them with the new instances).
java.lang.Object	clone() Clones of XmlData, same thing as deepCopy.
XmlData	deepCopy() Deep copy of XmlData.
boolean	equals(java.lang.Object o) Compares the specified object with this XmlData for equality.
java.util.Collection	getAllKids() Gets a collection of all kids of XmlData.
java.lang.String	getAttribute(java.lang.String name) Gets the value of a specified attribute.
java.lang.String	getAttribute(java.lang.String name, java.lang.String defaultValue) Gets the value of a specified attribute; if there is none, returns default value.
java.util.Map	getAttributes() Gets a Map of attributes.
java.lang.String	getId() Gets the id of XmlData, which is the value of attribute "id".
XmlData	getKid(java.lang.String type) Gets a kid of specified type, if any.
XmlData	getKid(java.lang.String type, java.lang.String id) Gets a kid having specified type and specified id.
XmlData	getKid(java.lang.String type, java.lang.String attribute, java.lang.String value) Gets a kid of specified type that has an attribute with a specified value.
int	getKidCount(java.lang.String type) Gets the number of kids of specified type.
java.util.Collection	getKids(java.lang.String type) Gets a Collection of kids of specified type.
java.lang.String	getKidValue(java.lang.String type) Gets the value of a kid of specified type, if any.
java.lang.String	getName() Gets the name of XmlData, which is the value of attribute "name".
java.lang.String	getType() Gets XmlData type, which is just a String.
java.lang.String	getValue() Gets a value of XmlData, which is just a String.
XmlData	getXmlContent() Gets the contents of this XmlData (that is, itself).
void	removeKid(XmlData kid) Removes a kid from the set of kids.
java.util.Collection	removeKids(java.lang.String type) Removes all kids of given type.
boolean	satisfies(java.lang.String expression) Checks whether this XmlData node satisfies given expression (presented as string).
boolean	satisfies(XmlData.Condition condition) Checks whether this XmlData node satisfies given condition.
void	save(java.io.File file) Saves XmlData to a file.
void	save(java.io.OutputStream os) Saves XmlData to an output stream.
void	save(java.lang.String filename) Saves XmlData to a file.
XmlData	selectTree(java.lang.String expression) Selects a subtree from XmlData, that is, the tree of those nodes that satisfy a condition.
XmlData	selectTree(XmlData.Condition condition) Selects a subtree from XmlData, that is, the tree of those nodes that satisfy a condition.
void	setAttribute(java.lang.String name, java.lang.String value) Sets an attribute value.
void	setAttributes(org.xml.sax.AttributeList attributes) Sets attributes from an AttributeList.
void	setAttributes(java.util.Map attributes) Sets attributes from a Map.
void	setAttributes(java.lang.String[] attributes) Sets attributes from an array of name-value pairs.
XmlData	setValue(java.lang.String v) Sets the value of XmlData.
void	setXmlContent(XmlData org) Sets the contents from another XmlData.
void	trim() Tries to trim the set of kids, so that there are no spare slots left.

Methods inherited from class java.lang.Object

getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

XmlDataClass

public static final java.lang.Class XmlDataClass

Constructor Detail

BasicXmlData

public BasicXmlData()

Default constructor.

Creates an empty instance.

BasicXmlData

public BasicXmlData(java.lang.String type)

Creates an instance of BasicXmlData of specified type.

Parameters:

type - the type of data, an arbitrary identifier string.

BasicXmlData

public BasicXmlData(java.lang.String type,
                    java.lang.String value)

Creates an instance of specified type and with the specified value.

Parameters:

type - the type of data, an arbitrary identifier string.

value - the value of data, any string.

Example:

new BasicXmlData("example", "This is an example").save(filename)
will result in the following output:

<?xml version="1.0" encoding="UTF-8"?>
<example>This is an example</example>
 

BasicXmlData

public BasicXmlData(java.lang.String type,
                    java.lang.String value,
                    java.util.Collection kids)

Creates an instance of specified type, with the specified value and the kids that are listed in the provided collection.

Parameters:

type - the type of data, an arbitrary identifier string.

value - the value of data, any string.

kids - a Collection of XmlData that attach themselves as kids to the instance being created

Example:

new BasicXmlData("example", "This is an example", Arrays.asList(new BasicXmlData[] {new BasicXmlData("subexample", "This is a kid of example")}).save(filename)
will result in the following output:

<?xml version="1.0" encoding="UTF-8"?>
<example>
  <subexample>This is a kid of example</subexample>This is an example</example>
 

BasicXmlData

public BasicXmlData(java.lang.String type,
                    java.lang.String value,
                    BasicXmlData[] kids)

Creates an instance of specified type, with the specified value and the kids that are listed in the provided array.

Parameters:

type - the type of data, an arbitrary identifier string.

value - the value of data, any string.

kids - an array of XmlData that attach themselves as kids to the instance being created

Example:

new BasicXmlData("example", "This is an example", new BasicXmlData[] {new BasicXmlData("subexample", "This is a kid of example")}).save(filename)
will result in the following output:

<?xml version="1.0" encoding="UTF-8"?>
<example>
  <subexample>This is a kid of example</subexample>This is an example</example>
 

BasicXmlData

public BasicXmlData(java.lang.String type,
                    java.lang.String value,
                    java.lang.String[] attributes)

Creates an instance of specified type, with the specified value and the attributes that are listed in the provided array as name-value pairs.

Parameters:

type - the type of data, an arbitrary identifier string.

value - the value of data, any string.

attributes - an String array of name-value pairs

Example:

new BasicXmlData("example", "This is an example", new String[] {"id", "0123dx", "name", "Whittman"}).save(filename)
will result in the following output:

<?xml version="1.0" encoding="UTF-8"?>
<example id="0123dx" name="Whittman">This is an example</example>
 

BasicXmlData

public BasicXmlData(java.lang.String type,
                    java.lang.String value,
                    java.lang.String[] attributes,
                    java.util.Collection kids)

Creates an instance of specified type, with the specified value, attributes that are listed in the provided array as name-value pairs, and the kids that are listed in the provided collection.

Parameters:

type - the type of data, an arbitrary identifier string.

value - the value of data, any string.

attributes - an String array of name-value pairs

kids - a Collection of XmlData that attach themselves as kids to the instance being created

Example:

new BasicXmlData("example", "This is an example", new String[] {"id", "007", "name", "Bond"}, Arrays.asList(new BasicXmlData[] {new BasicXmlData("subexample", "This is a kid of example")}).save(filename)
will result in the following output:

<?xml version="1.0" encoding="UTF-8"?>
<example id="007" name="Bond">
  <subexample>This is a kid of example</subexample>This is an example</example>
 

BasicXmlData

public BasicXmlData(java.lang.String type,
                    java.lang.String value,
                    java.lang.String[] attributes,
                    BasicXmlData[] kids)

Creates an instance of BasicXmlData of specified type, with the specified value, attributes that are listed in the provided array as name-value pairs, and the kids that are listed in the provided array of XmlData.

Parameters:

type - the type of data, an arbitrary identifier string.

value - the value of data, any string.

attributes - an String array of name-value pairs

kids - an array of XmlData that attach themselves as kids to the instance being created

Example:

new BasicXmlData("example", "This is an example", new String[] {"id", "007", "name", "Bond"}, new BasicXmlData[] {new BasicXmlData("subexample", "This is a kid of example")}).save(filename)
will result in the following output:

<?xml version="1.0" encoding="UTF-8"?>
<example id="007" name="Bond">
  <subexample>This is a kid of example</subexample>This is an example</example>
 

BasicXmlData

public BasicXmlData(java.lang.String type,
                    java.lang.String value,
                    org.xml.sax.AttributeList attributes)

Creates an instance of specified type, with the specified value, attributes that are listed in the provided AttributeList.

Parameters:

type - the type of data, an arbitrary identifier string.

value - the value of data, any string.

attributes - an AttributeList (@see org.xml.sax.AttributeList)

BasicXmlData

public BasicXmlData(java.lang.String type,
                    java.lang.String value,
                    org.xml.sax.AttributeList attributes,
                    java.util.Collection kids)

Creates an instance of specified type, with the specified value, attributes that are listed in the provided AttributeList, and the kids that are listed in the provided collection.

Parameters:

type - the type of data, an arbitrary identifier string.

value - the value of data, any string.

attributes - an AttributeList (@see org.xml.sax.AttributeList)

kids - a Collection of XmlData that attach themselves as kids to the instance being created

BasicXmlData

public BasicXmlData(java.lang.String type,
                    java.lang.String value,
                    org.xml.sax.AttributeList attributes,
                    BasicXmlData[] kids)

Creates an instance of specified type, with the specified value, attributes that are listed in the provided AttributeList, and the kids that are listed in the provided array of XmlData.

Parameters:

type - the type of data, an arbitrary identifier string.

value - the value of data, any string.

attributes - an AttributeList (@see org.xml.sax.AttributeList)

kids - an array of XmlData that attach themselves as kids to the instance being created

BasicXmlData

public BasicXmlData(java.lang.String type,
                    java.lang.String value,
                    java.util.Map attributes,
                    java.util.Collection kids)

Creates an instance of specified type, with the specified value, attributes that are listed in the provided map (name -> value), and the kids that are listed in the provided collection.

Parameters:

type - the type of data, an arbitrary identifier string.

value - the value of data, any string.

attributes - a Map that maps attributes names to values

kids - a Collection of XmlData that attach themselves as kids to the instance being created

BasicXmlData

public BasicXmlData(java.lang.String type,
                    java.lang.String value,
                    java.util.Map attributes,
                    java.util.Map byType)

Creates an instance of specified type, with the specified value, attributes that are listed in the provided Map (name -> value), and the kids that are listed in the provided Map, type->Collection.

Parameters:

type - the type of data, an arbitrary identifier string.

value - the value of data, any string.

attributes - a Map that maps attributes names to values.

byType - a Map that maps types to collections of XmlData kids.

Example:

Map attr = new HashMap();
 Map byType = new HashMap();
 byType.put("subexample", Arrays.asList(new Object[] {new BasicXmlData("subexample", "This is a kid of example")}));
 byType.put("feature", Arrays.asList(new Object[] {new BasicXmlData("feature", null, new String[] {"name", "arity", "value", "3"})}));
 attr.put("id", "008");
 attr.put("name", "Dumb");
 new BasicXmlData("example", "This is an example", attr, byType).save(filename)
 

will result in the following output:

<?xml version="1.0" encoding="UTF-8"?>
<example id="008" name="Dumb">
  <subexample>This is a kid of example</subexample>
  <feature name="arity" value="3">This is an example</example>
 

BasicXmlData

public BasicXmlData(XmlData org)

Creates an instance from another XmlData object (use clone() to get a real deep copy).

Parameters:

org - original XmlData

BasicXmlData

public BasicXmlData(java.io.InputStream in)
             throws java.io.IOException,
                    java.lang.InstantiationException

Creates an instance from the data read from input stream.

Parameters:

in - input stream

Throws:

java.io.IOException

java.lang.InstantiationiException

java.lang.InstantiationException

BasicXmlData

public BasicXmlData(java.io.File in)
             throws java.io.IOException,
                    java.lang.InstantiationException

Creates an instance from the data read from a file.

Parameters:

in - file containing XML data

Throws:

java.io.IOException

java.lang.InstantiationiException

java.lang.InstantiationException

BasicXmlData

public BasicXmlData(java.net.URL url)
             throws java.io.IOException,
                    java.lang.InstantiationException

Creates an instance from the data read from URL.

Parameters:

url - url pointing to XML data

Throws:

java.io.IOException

java.lang.InstantiationiException

java.lang.InstantiationException

Method Detail

setXmlContent

public void setXmlContent(XmlData org)

Sets the contents from another XmlData.

Specified by:

setXmlContent in interface XmlData

Parameters:

org - original XmlData

getXmlContent

public XmlData getXmlContent()

Gets the contents of this XmlData (that is, itself).

Specified by:

getXmlContent in interface XmlData

Returns:

itself

deepCopy

public XmlData deepCopy()

Deep copy of XmlData.

Returns:

deep copy of itself

clone

public java.lang.Object clone()

Clones of XmlData, same thing as deepCopy.

Specified by:

clone in interface XmlData

Returns:

deep copy of itself

equals

public boolean equals(java.lang.Object o)

Compares the specified object with this XmlData for equality. Returns true if the given object is also a XmlData, and the two XmlData represent the same data. More formally, two XmlDatas t1 and t2 represent the same data if t1.type.equals(t2.type) and t1.value.equals(t2.value) and t1.getAttributes.equals(t2.attributes()) and t1.getAllKids().equals(t2.getAllKids()).

Parameters:

o - object to be compared for equality with this XmlData.

Returns:

true if the specified object is equal to this XmlData.

Example:

<?xml version="1.0" encoding="UTF-8"?>
 <example a1="v1" a2="v2">
   <sub1 ax="vx" ay="vy"/>
   <sub2 aa="va" ab="vb"/>
 </example>
 

and

<?xml version="1.0" encoding="UTF-8"?>
 <example a2="v2" a1="v1">
   <sub2 ab="vb" aa="va"/>
   <sub1 ay="vy" ax="vx"/>
 </example>
 

are equal.

save

public void save(java.lang.String filename)
          throws java.io.IOException

Saves XmlData to a file.

Parameters:

filename - name of the file to write to

Throws:

java.io.IOException

save

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

Saves XmlData to a file.

Parameters:

file - file to write to

Throws:

java.io.IOException

save

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

Saves XmlData to an output stream.

Parameters:

os - output stream to write to

Throws:

java.io.IOException

setAttribute

public void setAttribute(java.lang.String name,
                         java.lang.String value)

Sets an attribute value.

Specified by:

setAttribute in interface XmlData

Parameters:

name - attribute name

value - attribute value

setAttributes

public void setAttributes(java.lang.String[] attributes)

Sets attributes from an array of name-value pairs.

Specified by:

setAttributes in interface XmlData

Parameters:

attributes - a String array consisting of name-value pairs.

setAttributes

public void setAttributes(java.util.Map attributes)

Sets attributes from a Map.

Specified by:

setAttributes in interface XmlData

Parameters:

attributes - a Map, name -> value.

setAttributes

public void setAttributes(org.xml.sax.AttributeList attributes)

Sets attributes from an AttributeList.

Specified by:

setAttributes in interface XmlData

Parameters:

attributes - AttributeList

getAttributes

public java.util.Map getAttributes()

Gets a Map of attributes.

Specified by:

getAttributes in interface XmlData

Returns:

a Map that maps attribute names to attribute values, all Strings

getType

public java.lang.String getType()

Gets XmlData type, which is just a String.

Specified by:

getType in interface XmlData

Returns:

the type string

getValue

public java.lang.String getValue()

Gets a value of XmlData, which is just a String.

Specified by:

getValue in interface XmlData

Returns:

the value

setValue

public XmlData setValue(java.lang.String v)

Sets the value of XmlData.

Specified by:

setValue in interface XmlData

Parameters:

v - new value for XmlData

Returns:

itself

getAttribute

public java.lang.String getAttribute(java.lang.String name)

Gets the value of a specified attribute.

Specified by:

getAttribute in interface XmlData

Parameters:

name - attribute name

Returns:

attribute value

getAttribute

public java.lang.String getAttribute(java.lang.String name,
                                     java.lang.String defaultValue)

Gets the value of a specified attribute; if there is none, returns default value.

Specified by:

getAttribute in interface XmlData

Parameters:

name - attribute name

defaultValue -

Returns:

attribute value or defaultValue

getName

public java.lang.String getName()

Gets the name of XmlData, which is the value of attribute "name".

Same thing as getAttribute("name").

Specified by:

getName in interface XmlData

Returns:

the name string

getId

public java.lang.String getId()

Gets the id of XmlData, which is the value of attribute "id".

Same thing as getAttribute("id").

Specified by:

getId in interface XmlData

Returns:

the id string

getAllKids

public java.util.Collection getAllKids()

Gets a collection of all kids of XmlData. Normally you would not need it; retrieving kids by type is what one normally does, but you never know...

Specified by:

getAllKids in interface XmlData

Returns:

a Collection of XmlData that contains all kids

getKids

public java.util.Collection getKids(java.lang.String type)

Gets a Collection of kids of specified type.

Specified by:

getKids in interface XmlData

Parameters:

type - type of the kids to choose

Returns:

all kids that have specified type

getKidCount

public int getKidCount(java.lang.String type)

Gets the number of kids of specified type.

Specified by:

getKidCount in interface XmlData

Parameters:

type -

Returns:

the number of such kids

getKid

public XmlData getKid(java.lang.String type)

Gets a kid of specified type, if any.

Specified by:

getKid in interface XmlData

Parameters:

type - type of the kid to chose

Returns:

any kid that has this type or null if there is no such kid

getKidValue

public java.lang.String getKidValue(java.lang.String type)

Gets the value of a kid of specified type, if any.

Specified by:

getKidValue in interface XmlData

Parameters:

type -

Returns:

the value of a kid of specified type or null if there's none

getKid

public XmlData getKid(java.lang.String type,
                      java.lang.String attribute,
                      java.lang.String value)

Gets a kid of specified type that has an attribute with a specified value.

Specified by:

getKid in interface XmlData

Parameters:

type - type of the kid to choose

attribute - attribute name

value - attribute value

Returns:

such a kid, if found, or null otherwise

getKid

public XmlData getKid(java.lang.String type,
                      java.lang.String id)

Gets a kid having specified type and specified id.

Specified by:

getKid in interface XmlData

Parameters:

type - kid type

id - kid id

Returns:

a kid of specified type that has the value named "id" equal to id

addKid

public XmlData addKid(XmlData kid)

Adds a kid to the set of kids.

Specified by:

addKid in interface XmlData

Parameters:

kid - kid to add

Returns:

the kid

removeKid

public void removeKid(XmlData kid)

Removes a kid from the set of kids.

Specified by:

removeKid in interface XmlData

Parameters:

kid - kid to remove

addKids

public void addKids(java.util.Collection kids)

Adds all XmlData elements from given Collection to the set of kids, skipping elements that are not XmlData.

Specified by:

addKids in interface XmlData

Parameters:

kids -

removeKids

public java.util.Collection removeKids(java.lang.String type)

Removes all kids of given type.

Specified by:

removeKids in interface XmlData

Parameters:

type - type of kids to remove

Returns:

Collection of removed kids

castKids

public boolean castKids(java.lang.String type,
                        java.lang.Class clazz)

Casts kids of specified type to a specified class (actually replacing them with the new instances).

Parameters:

type - type of the kids to cast

clazz - class to cast to

Returns:

true in case of success, false if casting failed somehow To cast, the class has to have a constructor that takes XmlData as the only argument

cast

public XmlData cast(java.util.Map typemap,
                    BasicXmlData.Policy policy)
             throws java.lang.InstantiationException,
                    java.lang.NoSuchMethodException,
                    java.lang.reflect.InvocationTargetException,
                    java.lang.IllegalArgumentException,
                    java.lang.IllegalAccessException

Casts XmlData and its kids, recursively, to specified classes, according to the typemap.

Parameters:

typemap - maps types to classes. Type is what XmlData considers a type: a string value of type property.

policy - one of the following: Policy.THROW_ON_ERROR (causes an exception in case of any error), Policy.KEEP_ON_ERROR (keeps nodes that cannot be cast), Policy.SKIP_ON_ERROR (ignores nodes that cannot be cast).

Returns:

a new instance of the class corresponding, via typemap, to the type of data.

Throws:

java.lang.InstantiationException

java.lang.NoSuchMethodException

java.lang.reflect.InvocationTargetException

java.lang.IllegalArgumentException

java.lang.IllegalAccessException - Exception are thrown only if policy is Policy.THROW_ON_ERROR

cast

public XmlData cast(java.lang.String packageName,
                    BasicXmlData.Policy policy)
             throws java.lang.InstantiationException,
                    java.lang.NoSuchMethodException,
                    java.lang.reflect.InvocationTargetException,
                    java.lang.IllegalArgumentException,
                    java.lang.IllegalAccessException,
                    java.lang.ClassNotFoundException

Casts XmlData and its kids, recursively, to classes in specified package.

Parameters:

packageName - the name of the package for casting. XmlData types are mapped to classes with the same name inside specified package. packageName can be null: then it is ignored.

policy - one of the following: Policy.THROW_ON_ERROR (causes an exception in case of any error), Policy.KEEP_ON_ERROR (keeps nodes that cannot be cast), Policy.SKIP_ON_ERROR (ignores nodes that cannot be cast).

Returns:

a new instance of the class which name is the type of the data

Throws:

java.lang.InstantiationException

java.lang.NoSuchMethodException

java.lang.reflect.InvocationTargetException

java.lang.IllegalArgumentException

java.lang.IllegalAccessException

java.lang.ClassNotFoundException - Exception are thrown only if policy is Policy.THROW_ON_ERROR

trim

public void trim()

Tries to trim the set of kids, so that there are no spare slots left.

This operation does not go deep, since it is assumed that you apply it in the process of building XmlData, and the kids are already trimmed.

satisfies

public boolean satisfies(XmlData.Condition condition)

Checks whether this XmlData node satisfies given condition.

Parameters:

condition -

Returns:

true if it does satisfy the condition, false otherwise. Any node satisfies an empty condition. This can look arguable, but you have to believe it, it comes from logic.

satisfies

public boolean satisfies(java.lang.String expression)

Checks whether this XmlData node satisfies given expression (presented as string).

the string is parsed first, and then the node is checked against the parsed expression.

Parameters:

expression -

Returns:

true if it does satisfy the expression, false otherwise. Note that if the expression is void or invalid, any node satisfies this expression.

selectTree

public XmlData selectTree(XmlData.Condition condition)

Selects a subtree from XmlData, that is, the tree of those nodes that satisfy a condition.

The node is included into the resulting tree iff it satisfies the condition; this filtering operation is applied recursively to its kids.

Specified by:

selectTree in interface XmlData

Parameters:

condition -

Returns:

XmlData containing only nodes that satisfy the filter

selectTree

public XmlData selectTree(java.lang.String expression)

Selects a subtree from XmlData, that is, the tree of those nodes that satisfy a condition.

The node is included into the resulting tree iff it satisfies the condition; this filtering operation is applied recursively to its kids.

Parameters:

expression - the string that contains a filtering expression

Returns:

XmlData containing only nodes that satisfy the expression

Example:

for the following data:

<?xml version="1.0" encoding="UTF-8"?>
 <example a1="v1" a2="v2">
   <sub1 ax="vx" ay="vy"/>
   <sub2 aa="va" ab="vb"/>
 </example>
 

selectTree("ax != \"vx\"") and
selectTree("a1 == \"v1\" || ab == \"vb\"")
will select the same subtree,

<?xml version="1.0" encoding="UTF-8"?>
 <example a1="v1" a2="v2">
   <sub2 aa="va" ab="vb"/>
 </example>