Package com.android.utils

Class XmlUtils

java.lang.Object

com.android.utils.XmlUtils

public class XmlUtils
extends java.lang.Object

XML Utilities

Field Summary

Fields

Modifier and Type	Field	Description
static char	NS_SEPARATOR	Separator for xml namespace and localname
static java.lang.String	XML_COMMENT_BEGIN
static java.lang.String	XML_COMMENT_END
static java.lang.String	XML_PROLOG

Constructor Summary

Constructors

Constructor	Description
XmlUtils()

Method Summary

Modifier and Type	Method	Description
static void	appendXmlAttributeValue(java.lang.StringBuilder sb, java.lang.String attrValue)	Appends text to the given StringBuilder and escapes it as required for a DOM attribute node.
static void	appendXmlTextValue(java.lang.StringBuilder sb, java.lang.String textValue)	Appends text to the given StringBuilder and escapes it as required for a DOM text node.
static java.lang.String	formatFloatAttribute(double value)	Format the given floating value into an XML string, omitting decimals if 0
static java.lang.String	fromXmlAttributeValue(java.lang.String escapedAttrValue)	Converts the given XML-attribute-safe value to a java string
static java.io.Reader	getUtfReader(java.io.File file)	Returns a character reader for the given file, which must be a UTF encoded file.
static boolean	hasElementChildren(org.w3c.dom.Node node)	Returns true if the given node has one or more element children
static java.lang.String	lookupNamespacePrefix(org.w3c.dom.Node node, java.lang.String nsUri)	Returns the namespace prefix matching the requested namespace URI.
static java.lang.String	lookupNamespacePrefix(org.w3c.dom.Node node, java.lang.String nsUri, boolean create)	Returns the namespace prefix matching the requested namespace URI.
static java.lang.String	lookupNamespacePrefix(org.w3c.dom.Node node, java.lang.String nsUri, java.lang.String defaultPrefix, boolean create)	Returns the namespace prefix matching the requested namespace URI.
static org.w3c.dom.Document	parseDocument(java.lang.String xml, boolean namespaceAware)	Parses the given XML string as a DOM document, using the JDK parser.
static org.w3c.dom.Document	parseDocumentSilently(java.lang.String xml, boolean namespaceAware)	Parses the given XML string as a DOM document, using the JDK parser.
static org.w3c.dom.Document	parseUtfXmlFile(java.io.File file, boolean namespaceAware)	Parses the given UTF file as a DOM document, using the JDK parser.
static java.lang.String	stripBom(java.lang.String xml)	Strips out a leading UTF byte order mark, if present
static java.lang.String	toXml(org.w3c.dom.Node node)	Dump an XML tree to string.
static java.lang.String	toXmlAttributeValue(java.lang.String attrValue)	Converts the given attribute value to an XML-attribute-safe value, meaning that single and double quotes are replaced with their corresponding XML entities.
static java.lang.String	toXmlTextValue(java.lang.String textValue)	Converts the given attribute value to an XML-text-safe value, meaning that less than and ampersand characters are escaped.

Methods inherited from class java.lang.Object

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

Field Detail

XML_COMMENT_BEGIN

public static final java.lang.String XML_COMMENT_BEGIN

See Also:

Constant Field Values

XML_COMMENT_END

public static final java.lang.String XML_COMMENT_END

See Also:

Constant Field Values

XML_PROLOG

public static final java.lang.String XML_PROLOG

See Also:

Constant Field Values

NS_SEPARATOR

public static final char NS_SEPARATOR

Separator for xml namespace and localname

See Also:

Constant Field Values

Constructor Detail

XmlUtils

public XmlUtils()

Method Detail

lookupNamespacePrefix

@NonNull
public static java.lang.String lookupNamespacePrefix(@NonNull
                                                     org.w3c.dom.Node node,
                                                     @NonNull
                                                     java.lang.String nsUri)

Returns the namespace prefix matching the requested namespace URI. If no such declaration is found, returns the default "android" prefix for the Android URI, and "app" for other URI's. By default the app namespace will be created. If this is not desirable, call lookupNamespacePrefix(Node, String, boolean) instead.

Parameters:

node - The current node. Must not be null.

nsUri - The namespace URI of which the prefix is to be found, e.g. SdkConstants.ANDROID_URI

Returns:

The first prefix declared or the default "android" prefix (or "app" for non-Android URIs)

lookupNamespacePrefix

@NonNull
public static java.lang.String lookupNamespacePrefix(@NonNull
                                                     org.w3c.dom.Node node,
                                                     @NonNull
                                                     java.lang.String nsUri,
                                                     boolean create)

Returns the namespace prefix matching the requested namespace URI. If no such declaration is found, returns the default "android" prefix for the Android URI, and "app" for other URI's.

Parameters:

node - The current node. Must not be null.

nsUri - The namespace URI of which the prefix is to be found, e.g. SdkConstants.ANDROID_URI

create - whether the namespace declaration should be created, if necessary

Returns:

The first prefix declared or the default "android" prefix (or "app" for non-Android URIs)

lookupNamespacePrefix

public static java.lang.String lookupNamespacePrefix(@Nullable
                                                     org.w3c.dom.Node node,
                                                     @Nullable
                                                     java.lang.String nsUri,
                                                     @Nullable
                                                     java.lang.String defaultPrefix,
                                                     boolean create)

Returns the namespace prefix matching the requested namespace URI. If no such declaration is found, returns the default "android" prefix.

Parameters:

node - The current node. Must not be null.

nsUri - The namespace URI of which the prefix is to be found, e.g. SdkConstants.ANDROID_URI

defaultPrefix - The default prefix (root) to use if the namespace is not found. If null, do not create a new namespace if this URI is not defined for the document.

create - whether the namespace declaration should be created, if necessary

Returns:

The first prefix declared or the provided prefix (possibly with a number appended to avoid conflicts with existing prefixes.

toXmlAttributeValue

@NonNull
public static java.lang.String toXmlAttributeValue(@NonNull
                                                   java.lang.String attrValue)

Converts the given attribute value to an XML-attribute-safe value, meaning that single and double quotes are replaced with their corresponding XML entities.

Parameters:

attrValue - the value to be escaped

Returns:

the escaped value

fromXmlAttributeValue

@NonNull
public static java.lang.String fromXmlAttributeValue(@NonNull
                                                     java.lang.String escapedAttrValue)

Converts the given XML-attribute-safe value to a java string

Parameters:

escapedAttrValue - the escaped value

Returns:

the unescaped value

toXmlTextValue

@NonNull
public static java.lang.String toXmlTextValue(@NonNull
                                              java.lang.String textValue)

Converts the given attribute value to an XML-text-safe value, meaning that less than and ampersand characters are escaped.

Parameters:

textValue - the text value to be escaped

Returns:

the escaped value

appendXmlAttributeValue

public static void appendXmlAttributeValue(@NonNull
                                           java.lang.StringBuilder sb,
                                           @NonNull
                                           java.lang.String attrValue)

Appends text to the given StringBuilder and escapes it as required for a DOM attribute node.

Parameters:

sb - the string builder

attrValue - the attribute value to be appended and escaped

appendXmlTextValue

public static void appendXmlTextValue(@NonNull
                                      java.lang.StringBuilder sb,
                                      @NonNull
                                      java.lang.String textValue)

Appends text to the given StringBuilder and escapes it as required for a DOM text node.

Parameters:

sb - the string builder

textValue - the text value to be appended and escaped

hasElementChildren

public static boolean hasElementChildren(@NonNull
                                         org.w3c.dom.Node node)

Returns true if the given node has one or more element children

Parameters:

node - the node to test for element children

Returns:

true if the node has one or more element children

getUtfReader

public static java.io.Reader getUtfReader(@NonNull
                                          java.io.File file)
                                   throws java.io.IOException

Returns a character reader for the given file, which must be a UTF encoded file.

The reader does not need to be closed by the caller (because the file is read in full in one shot and the resulting array is then wrapped in a byte array input stream, which does not need to be closed.)

Throws:

java.io.IOException

parseDocument

@NonNull
public static org.w3c.dom.Document parseDocument(@NonNull
                                                 java.lang.String xml,
                                                 boolean namespaceAware)
                                          throws javax.xml.parsers.ParserConfigurationException,
                                                 java.io.IOException,
                                                 org.xml.sax.SAXException

Parses the given XML string as a DOM document, using the JDK parser. The parser does not validate, and is optionally namespace aware.

Parameters:

xml - the XML content to be parsed (must be well formed)

namespaceAware - whether the parser is namespace aware

Returns:

the DOM document

Throws:

javax.xml.parsers.ParserConfigurationException

java.io.IOException

org.xml.sax.SAXException

parseUtfXmlFile

@NonNull
public static org.w3c.dom.Document parseUtfXmlFile(@NonNull
                                                   java.io.File file,
                                                   boolean namespaceAware)
                                            throws javax.xml.parsers.ParserConfigurationException,
                                                   java.io.IOException,
                                                   org.xml.sax.SAXException

Parses the given UTF file as a DOM document, using the JDK parser. The parser does not validate, and is optionally namespace aware.

Parameters:

file - the UTF encoded file to parse

namespaceAware - whether the parser is namespace aware

Returns:

the DOM document

Throws:

javax.xml.parsers.ParserConfigurationException

java.io.IOException

org.xml.sax.SAXException

stripBom

@NonNull
public static java.lang.String stripBom(@NonNull
                                        java.lang.String xml)

Strips out a leading UTF byte order mark, if present

parseDocumentSilently

@Nullable
public static org.w3c.dom.Document parseDocumentSilently(@NonNull
                                                         java.lang.String xml,
                                                         boolean namespaceAware)

Parses the given XML string as a DOM document, using the JDK parser. The parser does not validate, and is optionally namespace aware. Any parsing errors are silently ignored.

Parameters:

xml - the XML content to be parsed (must be well formed)

namespaceAware - whether the parser is namespace aware

Returns:

the DOM document, or null

toXml

public static java.lang.String toXml(org.w3c.dom.Node node)

Dump an XML tree to string. This does not perform any pretty printing. To perform pretty printing, use XmlPrettyPrinter.prettyPrint(node) in sdk-common.

formatFloatAttribute

public static java.lang.String formatFloatAttribute(double value)

Format the given floating value into an XML string, omitting decimals if 0

Parameters:

value - the value to be formatted

Returns:

the corresponding XML string for the value