Package com.jcabi.xml

Class XMLDocument

  • All Implemented Interfaces:
    XML

    public final class XMLDocument
    extends Object
    implements XML
    Implementation of XML.

    Objects of this class are immutable and thread-safe.

    Since:
    0.1
    Suppressed Checkstyle violations:
    ClassDataAbstractionCoupling (500 lines), ClassFanOutComplexity (500 lines), AbbreviationAsWordInNameCheck (10 lines)
    • Constructor Detail

      • XMLDocument

        public XMLDocument​(String text)
        Public ctor, from XML as a text.

        The object is created with a default implementation of NamespaceContext, which already defines a number of namespaces, for convenience, including:

         xhtml: http://www.w3.org/1999/xhtml
         xs: http://www.w3.org/2001/XMLSchema
         xsi: http://www.w3.org/2001/XMLSchema-instance
         xsl: http://www.w3.org/1999/XSL/Transform
         svg: http://www.w3.org/2000/svg

        In future versions we will add more namespaces (submit a ticket if you need more of them defined here).

        Parameters:
        text - XML document body
      • XMLDocument

        public XMLDocument​(byte[] data)
        Public ctor, from XML as a text.

        The object is created with a default implementation of NamespaceContext, which already defines a number of namespaces, for convenience, including:

         xhtml: http://www.w3.org/1999/xhtml
         xs: http://www.w3.org/2001/XMLSchema
         xsi: http://www.w3.org/2001/XMLSchema-instance
         xsl: http://www.w3.org/1999/XSL/Transform
         svg: http://www.w3.org/2000/svg

        In future versions we will add more namespaces (submit a ticket if you need more of them defined here).

        Parameters:
        data - The XML body
      • XMLDocument

        public XMLDocument​(Node node)
        Public ctor, from a DOM node.

        The object is created with a default implementation of NamespaceContext, which already defines a number of namespaces, see XMLDocument(String).

        Parameters:
        node - DOM source
        Since:
        0.2
      • XMLDocument

        public XMLDocument​(Source source)
        Public ctor, from a source.

        The object is created with a default implementation of NamespaceContext, which already defines a number of namespaces, see XMLDocument(String).

        An IllegalArgumentException is thrown if the parameter passed is not in XML format.

        Parameters:
        source - Source of XML document
      • XMLDocument

        public XMLDocument​(InputStream stream)
                    throws IOException
        Public ctor, from input stream.

        The object is created with a default implementation of NamespaceContext, which already defines a number of namespaces, see XMLDocument(String).

        An IllegalArgumentException is thrown if the parameter passed is not in XML format.

        The provided input stream will be closed automatically after getting data from it.

        Parameters:
        stream - The input stream, which will be closed automatically
        Throws:
        IOException - In case of I/O problem
    • Method Detail

      • node

        public Node node()
        Description copied from interface: XML
        Retrieve DOM node, represented by this wrapper.
        Specified by:
        node in interface XML
        Returns:
        DOM node
      • xpath

        public List<String> xpath​(String query)
        Description copied from interface: XML
        Find and return text elements or attributes matched by XPath address.

        The XPath query should point to text elements or attributes in the XML document. If any nodes of different types (elements, comments, etc.) are found in result node list - a RuntimeException will be thrown.

        Alternatively, the XPath query can be a function or expression that returns a single value instead of pointing to a set of nodes. In this case, the result will be a List containing a single String, the content of which is the result of the evaluation. If the expression result is not a String, it will be converted to a String representation and returned as such. For example, a document containing three <a> elements, the input query "count(//a)", will return a singleton List with a single string value "3".

        This is a convenient method, which is used (according to our experience) in 95% of all cases. Usually you don't need to get anything else but a text value of some node or an attribute. And in most cases you are interested to get just the first value (use xpath(..).get(0)). But when/if you need to get more than just a plain text - use XML.nodes(String).

        The List returned will throw IndexOutOfBoundsException if you try to access a node which wasn't found by this XPath query.

        An IllegalArgumentException is thrown if the parameter passed is not a valid XPath expression.

        Specified by:
        xpath in interface XML
        Parameters:
        query - The XPath query
        Returns:
        The list of string values (texts) or single function result
      • registerNs

        public XML registerNs​(String prefix,
                              Object uri)
        Description copied from interface: XML
        Register additional namespace prefix for XPath.

        For example:

         String name = new XMLDocument("...")
           .registerNs("ns1", "http://example.com")
           .registerNs("foo", "http://example.com/foo")
           .xpath("/ns1:root/foo:name/text()")
           .get(0);
         

        A number of standard namespaces are registered by default in instances of XML. Their full list is in XMLDocument(String).

        If a namespace prefix is already registered an IllegalArgumentException will be thrown.

        Specified by:
        registerNs in interface XML
        Parameters:
        prefix - The XPath prefix to register
        uri - Namespace URI
        Returns:
        A new XML document, with this additional namespace registered
      • nodes

        public List<XML> nodes​(String query)
        Description copied from interface: XML
        Retrieve DOM nodes from the XML response.

        The List returned will throw IndexOutOfBoundsException if you try to access a node which wasn't found by this XPath query.

        An IllegalArgumentException is thrown if the parameter passed is not a valid XPath expression.

        Specified by:
        nodes in interface XML
        Parameters:
        query - The XPath query
        Returns:
        Collection of DOM nodes
      • merge

        public XML merge​(NamespaceContext ctx)
        Description copied from interface: XML
        Append this namespace context to the existing one.

        The existing context (inside this object) and the new one provided will be merged together. The existing context will be have higher priority.

        Specified by:
        merge in interface XML
        Parameters:
        ctx - The context to append
        Returns:
        A new XML document, with a merged context on board