Package 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:

org.apache.metamodel.convert.HasReadTypeConverters, org.apache.metamodel.DataContext

public class XmlSaxDataContext
extends org.apache.metamodel.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

Fields

Modifier and Type	Field	Description
static String	COLUMN_NAME_ROW_ID

Fields inherited from class org.apache.metamodel.QueryPostprocessDataContext

INFORMATION_SCHEMA_NAME, SYSTEM_PROPERTY_CREATE_DEFAULT_TABLE_ALIAS

Constructor Summary

Constructors

Constructor	Description
XmlSaxDataContext(File file, XmlSaxTableDef... tableDefs)
XmlSaxDataContext(Supplier<InputSource> inputSourceRef, Collection<XmlSaxTableDef> tableDefs)	Constructs an XML DataContext based on SAX parsing.
XmlSaxDataContext(Supplier<InputSource> inputSourceRef, XmlSaxTableDef... tableDefs)
XmlSaxDataContext(org.apache.metamodel.util.Resource resource, Collection<XmlSaxTableDef> tableDefs)
XmlSaxDataContext(org.apache.metamodel.util.Resource resource, XmlSaxTableDef... tableDefs)

Method Summary

Modifier and Type	Method	Description
protected org.apache.metamodel.schema.Schema	getMainSchema()
protected String	getMainSchemaName()
protected org.apache.metamodel.data.DataSet	materializeMainSchemaTable(org.apache.metamodel.schema.Table table, List<org.apache.metamodel.schema.Column> columns, int maxRows)

Methods inherited from class org.apache.metamodel.QueryPostprocessDataContext

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

Methods inherited from class org.apache.metamodel.AbstractDataContext

compileQuery, executeQuery, executeQuery, getColumnByQualifiedLabel, getDefaultSchema, getSchemaByName, getSchemaNames, getSchemas, getTableByQualifiedLabel, isQualifiedPathDelim, onSchemaCacheRefreshed, 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(Supplier<InputSource> inputSourceRef,
                         Collection<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 - a collection of table definitions, which provide instructions as to the xpaths to apply to the document.

See Also:

XmlSaxTableDef

XmlSaxDataContext

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

XmlSaxDataContext

public XmlSaxDataContext(org.apache.metamodel.util.Resource resource,
                         XmlSaxTableDef... tableDefs)

XmlSaxDataContext

public XmlSaxDataContext(org.apache.metamodel.util.Resource resource,
                         Collection<XmlSaxTableDef> tableDefs)

XmlSaxDataContext

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

Method Detail

getMainSchema

protected org.apache.metamodel.schema.Schema getMainSchema()
                                                    throws org.apache.metamodel.MetaModelException

Specified by:

getMainSchema in class org.apache.metamodel.QueryPostprocessDataContext

Throws:

org.apache.metamodel.MetaModelException

getMainSchemaName

protected String getMainSchemaName()
                            throws org.apache.metamodel.MetaModelException

Specified by:

getMainSchemaName in class org.apache.metamodel.QueryPostprocessDataContext

Throws:

org.apache.metamodel.MetaModelException

materializeMainSchemaTable

protected org.apache.metamodel.data.DataSet materializeMainSchemaTable(org.apache.metamodel.schema.Table table,
                                                                       List<org.apache.metamodel.schema.Column> columns,
                                                                       int maxRows)

Specified by:

materializeMainSchemaTable in class org.apache.metamodel.QueryPostprocessDataContext