org.apache.metamodel.xml
Class XmlSaxDataContext

java.lang.Object
  org.apache.metamodel.AbstractDataContext
      org.apache.metamodel.QueryPostprocessDataContext
          org.apache.metamodel.xml.XmlSaxDataContext

All Implemented Interfaces:

HasReadTypeConverters, DataContext

public class XmlSaxDataContext
extends QueryPostprocessDataContext

XML datacontext which uses SAX parsing for fast and memory effecient reading of XML files. The DataContext requires the user to specify a set of (simplified) XPaths to define which elements are row delimitors and which elements or attributes are value/column definitions.

Field Summary

static String

COLUMN_NAME_ROW_ID

Fields inherited from class org.apache.metamodel.QueryPostprocessDataContext

INFORMATION_SCHEMA_NAME

Constructor Summary

XmlSaxDataContext(File file, XmlSaxTableDef... tableDefs)

XmlSaxDataContext(Ref<InputSource> inputSourceRef, XmlSaxTableDef... tableDefs)
Constructs an XML DataContext based on SAX parsing.

XmlSaxDataContext(Resource resource, XmlSaxTableDef... tableDefs)

Method Summary

protected Schema	getMainSchema()
protected String	getMainSchemaName()
protected DataSet	materializeMainSchemaTable(Table table, Column[] columns, int maxRows)

Methods inherited from class org.apache.metamodel.QueryPostprocessDataContext

addConverter, executeCountQuery, executePrimaryKeyLookupQuery, executeQuery, getDefaultSchemaName, getMainSchemaInternal, getSchemaByNameInternal, getSchemaNamesInternal, isMainSchemaTable, materializeFromItem, materializeMainSchemaTable, materializeMainSchemaTable, materializeMainSchemaTable, materializeTable, materializeTable

Methods inherited from class org.apache.metamodel.AbstractDataContext

compileQuery, executeQuery, executeQuery, getColumnByQualifiedLabel, getDefaultSchema, getSchemaByName, getSchemaNames, getSchemas, getTableByQualifiedLabel, isQualifiedPathDelim, parseQuery, query, refreshSchemas

Methods inherited from class java.lang.Object

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

Field Detail

COLUMN_NAME_ROW_ID

public static final String COLUMN_NAME_ROW_ID

See Also:

Constant Field Values

Constructor Detail

XmlSaxDataContext

public XmlSaxDataContext(Ref<InputSource> inputSourceRef,
                         XmlSaxTableDef... tableDefs)

Constructs an XML DataContext based on SAX parsing.

Parameters:

inputSourceRef - a factory reference for the input source to read the XML from. The ref will be repeatedly called for each access to the file!

tableDefs - an array of table definitions, which provide instructions as to the xpaths to apply to the document.

See Also:

XmlSaxTableDef

XmlSaxDataContext

public XmlSaxDataContext(Resource resource,
                         XmlSaxTableDef... tableDefs)

XmlSaxDataContext

public XmlSaxDataContext(File file,
                         XmlSaxTableDef... tableDefs)

Method Detail

getMainSchema

protected Schema getMainSchema()
                        throws MetaModelException

Specified by:

getMainSchema in class QueryPostprocessDataContext

Throws:

MetaModelException

getMainSchemaName

protected String getMainSchemaName()
                            throws MetaModelException

Specified by:

getMainSchemaName in class QueryPostprocessDataContext

Throws:

MetaModelException

materializeMainSchemaTable

protected DataSet materializeMainSchemaTable(Table table,
                                             Column[] columns,
                                             int maxRows)

Specified by:

materializeMainSchemaTable in class QueryPostprocessDataContext