/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.uima.resource.metadata.impl;
import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.io.Writer;
import java.lang.reflect.Array;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.apache.uima.UIMARuntimeException;
import org.apache.uima.UIMA_IllegalArgumentException;
import org.apache.uima.UIMA_UnsupportedOperationException;
import org.apache.uima.internal.util.XMLUtils;
import org.apache.uima.resource.metadata.MetaDataObject;
import org.apache.uima.util.InvalidXMLException;
import org.apache.uima.util.NameClassPair;
import org.apache.uima.util.XMLParser;
import org.apache.uima.util.XMLSerializer;
import org.apache.uima.util.XMLizable;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.Attributes;
import org.xml.sax.ContentHandler;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.AttributesImpl;
/**
* Abstract base class for all MetaDataObjects in the reference implementation. Provides basic
* support for getting and setting property values given their names, by storing all attribute
* values in a HashMap keyed on attribute name.
* <p>
* Also provides the ability to write objects to XML and build objects from their DOM
* representation, as required to implement the {@link XMLizable} interface, which is a
* superinterface of {@link MetaDataObject}. In future versions, this could be replaced by a
* non-proprietary XML binding solution such as JAXB or EMF.
* <p>
*
* The implementation for getting and setting property values uses the JavaBeans introspection API.
* Therefore subclasses of this class must be valid JavaBeans and either use the standard naming
* conventions for getters and setters or else provide a BeanInfo class. See <a
* href="http://java.sun.com/docs/books/tutorial/javabeans/"> The Java Beans Tutorial</a> for more
* information.
*
*
*/
public abstract class MetaDataObject_impl implements MetaDataObject {
static final long serialVersionUID = 5876728533863334480L;
private static String PROP_NAME_SOURCE_URL = "sourceUrl";
private static final Attributes EMPTY_ATTRIBUTES = new AttributesImpl();
private transient PropertyDescriptor[] mPropertyDescriptors = null;
private transient URL mSourceUrl;
/**
* Creates a new <code>MetaDataObject_impl</code> with null attribute values
*/
public MetaDataObject_impl() {
}
/**
* Returns a list of <code>NameClassPair</code> objects indicating the attributes of this object
* and the Classes of the attributes' values. For primitive types, the wrapper classes will be
* returned (e.g. <code>java.lang.Integer</code> instead of int).
*
* @see org.apache.uima.resource.MetaDataObject#listAttributes()
*/
public List listAttributes() {
try {
PropertyDescriptor[] props = getPropertyDescriptors();
List resultList = new ArrayList(props.length);
for (int i = 0; i < props.length; i++) {
// only list properties with read and write methods,
// and don't include the SourceUrl property, which is for
// internal bookkeeping and shouldn't affect object equality
if (props[i].getReadMethod() != null && props[i].getWriteMethod() != null
&& !props[i].getName().equals(PROP_NAME_SOURCE_URL)) {
String propName = props[i].getName();
Class propClass = props[i].getPropertyType();
// translate primitive types (int, boolean, etc.) to wrapper classes
if (propClass.isPrimitive()) {
propClass = getWrapperClass(propClass);
}
resultList.add(new NameClassPair(propName, propClass.getName()));
}
}
return resultList;
} catch (IntrospectionException e) {
throw new UIMARuntimeException(e);
}
}
/**
* @see org.apache.uima.resource.MetaDataObject#getAttributeValue(String)
*/
public Object getAttributeValue(String aName) {
try {
PropertyDescriptor[] props = getPropertyDescriptors();
for (int i = 0; i < props.length; i++) {
if (props[i].getName().equals(aName)) {
Method reader = props[i].getReadMethod();
if (reader != null) {
return reader.invoke(this, new Object[0]);
}
}
}
return null;
} catch (Exception e) {
throw new UIMARuntimeException(e);
}
}
/**
* Gets the Class of the given attribue's value. For primitive types, the wrapper classes will be
* returned (e.g. <code>java.lang.Integer</code> instead of int).
*
* @param aName
* name of an attribute
*
* @return Class of value that may be assigned to the named attribute. Returns <code>null</code>
* if there is no attribute with the given name.
*/
public Class getAttributeClass(String aName) {
try {
List attrList = listAttributes();
Iterator it = attrList.iterator();
while (it.hasNext()) {
NameClassPair ncp = (NameClassPair) it.next();
if (ncp.getName().equals(aName)) {
return Class.forName(ncp.getClassName());
}
}
return null;
} catch (Exception e) {
throw new UIMARuntimeException(e);
}
}
/**
* Returns whether this object is modifiable. MetaDataObjects are modifiable by default.
*
* @see org.apache.uima.resource.MetaDataObject#isModifiable()
*/
public boolean isModifiable() {
return true;
}
/**
* @see org.apache.uima.resource.MetaDataObject#setAttributeValue(String, Object)
*/
public void setAttributeValue(String aName, Object aValue) {
try {
PropertyDescriptor[] props = getPropertyDescriptors();
for (int i = 0; i < props.length; i++) {
if (props[i].getName().equals(aName)) {
Method writer = props[i].getWriteMethod();
if (writer != null) {
try {
writer.invoke(this, new Object[] { aValue });
} catch (IllegalArgumentException e) {
throw new UIMA_IllegalArgumentException(
UIMA_IllegalArgumentException.METADATA_ATTRIBUTE_TYPE_MISMATCH, new Object[] {
aValue, aName }, e);
}
} else {
throw new UIMA_UnsupportedOperationException(
UIMA_UnsupportedOperationException.NOT_MODIFIABLE, new Object[] { aName,
this.getClass().getName() });
}
}
}
} catch (UIMA_IllegalArgumentException e) {
throw e;
} catch (Exception e) {
throw new UIMARuntimeException(e);
}
}
/**
* Gets the relative path base used to resolve imports. This is equal to the sourceUrl of this
* object, if known (i.e. if the object was parsed from an XML file or if setSourceUrl was
* explicitly called). If the source URL is not known, the value of the user.dir System property
* is returned.
*
* @return the base URL for resolving relative paths in this object
*/
public URL getRelativePathBase() {
if (mSourceUrl != null) {
return mSourceUrl;
} else {
try {
return new File(System.getProperty("user.dir")).toURL();
} catch (MalformedURLException e) {
try {
return new URL("file:/");
} catch (MalformedURLException e1) {
// assert false;
return null;
}
}
}
}
/**
* Gets the URL from which this object was parsed. When this object is parsed from an XML file,
* this is set by the parser to the URL of the source file XML file. If the object has been
* created by some other method, the source URL will not be known, and this method will return
* null.
* <p>
* This setting is used to resolve imports and is also included in exception messages to indicate
* the source of the problem.
*
* @return the source URL from which this object was parsed
*/
public URL getSourceUrl() {
return mSourceUrl;
}
/**
* If the sourceURL of this object is non-null, returns its string representation. If it is null,
* returns "<unknown>". Useful for error messages.
*
* @return the source URL as a string, or "<unknown>"
*/
public String getSourceUrlString() {
return mSourceUrl != null ? mSourceUrl.toString() : "<unknown>";
}
/**
* Sets the source URL of this object, only if that URL is currently set to null. This is used
* internally to update null relative base paths before doing import resolution, without
* overriding user-specified settings.
*
* @param aUrl
* the location of the XML file from which this object was parsed
*/
public void setSourceUrlIfNull(URL aUrl) {
if (mSourceUrl == null) {
setSourceUrl(aUrl);
}
}
/**
* Sets the URL from which this object was parsed. Typically only the XML parser sets this. This
* recursively sets the source URL of all descendants of this object.
*
* @param aUrl
* the location of the XML file from which this object was parsed
*/
public void setSourceUrl(URL aUrl) {
mSourceUrl = aUrl;
// set recursively on subobjects
List attrs = listAttributes();
Iterator i = attrs.iterator();
while (i.hasNext()) {
String attrName = ((NameClassPair) i.next()).getName();
Object val = getAttributeValue(attrName);
if (val instanceof MetaDataObject_impl) {
((MetaDataObject_impl) val).setSourceUrl(aUrl);
} else if (val != null && val.getClass().isArray()) {
int len = Array.getLength(val);
for (int j = 0; j < len; j++) {
Object arrayElem = Array.get(val, j);
if (arrayElem instanceof MetaDataObject_impl) {
((MetaDataObject_impl) arrayElem).setSourceUrl(aUrl);
}
}
} else if (val instanceof Map) {
Iterator valIter = ((Map) val).values().iterator();
while (valIter.hasNext()) {
Object mapVal = valIter.next();
if (mapVal instanceof MetaDataObject_impl) {
((MetaDataObject_impl) mapVal).setSourceUrl(aUrl);
}
}
}
}
}
/**
* @see org.apache.uima.resource.MetaDataObject#clone()
*/
public Object clone() {
// System.out.println("MetaDataObject_impl: clone");
MetaDataObject_impl clone = null;
try {
// do the default cloning
clone = (MetaDataObject_impl) super.clone();
} catch (CloneNotSupportedException e) {
// assert false : "All MetaDataObjects are Cloneable";
throw new UIMARuntimeException(e);
}
// now clone all values that are MetaDataObjects
List attrs = listAttributes();
Iterator i = attrs.iterator();
while (i.hasNext()) {
String attrName = ((NameClassPair) i.next()).getName();
Object val = getAttributeValue(attrName);
if (val instanceof MetaDataObject) {
Object clonedVal = ((MetaDataObject) val).clone();
clone.setAttributeValue(attrName, clonedVal);
} else if (val != null && val.getClass().isArray()) {
// clone the array, and clone any MetaDataObjects in the array
Class componentType = val.getClass().getComponentType();
int length = Array.getLength(val);
Object arrayClone = Array.newInstance(componentType, length);
for (int j = 0; j < length; j++) {
Object component = Array.get(val, j);
if (component instanceof MetaDataObject) {
component = ((MetaDataObject) component).clone();
}
Array.set(arrayClone, j, component);
}
clone.setAttributeValue(attrName, arrayClone);
}
}
return clone;
}
/**
* Dump this metadata object's attributes and values to a String. This is useful for debugging.
*/
public String toString() {
StringBuffer buf = new StringBuffer();
buf.append(getClass().getName()).append(": \n");
List attrList = listAttributes();
Iterator i = attrList.iterator();
while (i.hasNext()) {
NameClassPair ncp = (NameClassPair) i.next();
buf.append(ncp.getName() + " = ");
Object val = getAttributeValue(ncp.getName());
if (val == null)
buf.append("NULL");
else if (val instanceof Object[]) {
Object[] array = (Object[]) val;
buf.append("Array{");
for (int j = 0; j < array.length; j++) {
buf.append(j).append(": ").append(array[j].toString()).append("\n");
}
buf.append("}\n");
} else
buf.append(val.toString());
buf.append("\n");
}
return buf.toString();
}
/**
* Determines if this object is equal to another. Two MetaDataObjects are equivalent if they share
* the same attributes and the same values for those attributes.
*
* @param aObj
* object with which to compare this object
*
* @return true if and only if this object is equal to <code>aObj</code>
*/
public boolean equals(Object aObj) {
if (!(aObj instanceof MetaDataObject)) {
return false;
}
MetaDataObject mdo = (MetaDataObject) aObj;
// get the attributes (and classes) for the two objects
List theseAttrs = this.listAttributes();
List thoseAttrs = mdo.listAttributes();
// attribute lists must be same length
if (theseAttrs.size() != thoseAttrs.size()) {
return false;
}
// iterate through all attributes in this object
Iterator i = theseAttrs.iterator();
while (i.hasNext()) {
NameClassPair ncp = (NameClassPair) i.next();
// other object must contain this attribute
if (!thoseAttrs.contains(ncp)) {
return false;
}
// get values and test equivalency
Object val1 = this.getAttributeValue(ncp.getName());
Object val2 = mdo.getAttributeValue(ncp.getName());
if (val1 == null) {
if (val2 != null)
return false;
} else if (val1 instanceof Object[]) {
if (!(val2 instanceof Object[]))
return false;
if (!Arrays.equals((Object[]) val1, (Object[]) val2))
return false;
} else if (val1 instanceof Map) // only need this to handle Maps w/ array vals
{
if (!(val2 instanceof Map))
return false;
Set entrySet1 = ((Map) val1).entrySet();
Iterator it = entrySet1.iterator();
while (it.hasNext()) {
Map.Entry entry = (Map.Entry) it.next();
Object subval1 = ((Map) val1).get(entry.getKey());
Object subval2 = ((Map) val2).get(entry.getKey());
if (subval1 == null) {
if (subval2 != null)
return false;
} else if (subval1 instanceof Object[]) {
if (!(subval2 instanceof Object[]))
return false;
if (!Arrays.equals((Object[]) subval1, (Object[]) subval2))
return false;
} else
return subval1.equals(subval2);
}
} else {
if (!val1.equals(val2))
return false;
}
}
// if we get this far, objects are equal
return true;
}
/**
* Gets the hash code for this object. The hash codes of two NameClassPairs <code>x</code> and
* </code>y</code> must be equal if <code>x.equals(y)</code> returns true;
*
* @return the hash code for this object
*/
public int hashCode() {
int hashCode = 0;
// add the hash codes of all attributes
List attrs = listAttributes();
Iterator i = attrs.iterator();
while (i.hasNext()) {
String attrName = ((NameClassPair) i.next()).getName();
Object val = getAttributeValue(attrName);
if (val != null) {
if (val instanceof Object[]) {
Object[] arr = (Object[]) val;
for (int j = 0; j < arr.length; j++) {
if (arr[j] != null) {
hashCode += arr[j].hashCode();
}
}
} else if (val instanceof Map) // only need to do this to handle Maps w/ array vals
{
Set entrySet = ((Map) val).entrySet();
Iterator it = entrySet.iterator();
while (it.hasNext()) {
Map.Entry entry = (Map.Entry) it.next();
hashCode += entry.getKey().hashCode();
Object subval = entry.getValue();
if (subval instanceof Object[]) {
Object[] arr = (Object[]) subval;
for (int j = 0; j < arr.length; j++) {
if (arr[j] != null) {
hashCode += arr[j].hashCode();
}
}
} else {
hashCode += subval.hashCode();
}
}
} else {
hashCode += val.hashCode();
}
}
}
return hashCode;
}
/**
* Writes out this object's XML representation.
*
* @param aWriter
* a Writer to which the XML string will be written
*/
public void toXML(Writer aWriter) throws SAXException, IOException {
XMLSerializer sax2xml = new XMLSerializer(aWriter);
ContentHandler contentHandler = sax2xml.getContentHandler();
contentHandler.startDocument();
toXML(sax2xml.getContentHandler(), true);
contentHandler.endDocument();
}
/**
* Writes out this object's XML representation.
*
* @param aOutputStream
* an OutputStream to which the XML string will be written
*/
public void toXML(OutputStream aOutputStream) throws SAXException, IOException {
XMLSerializer sax2xml = new XMLSerializer(aOutputStream);
ContentHandler contentHandler = sax2xml.getContentHandler();
contentHandler.startDocument();
toXML(sax2xml.getContentHandler(), true);
contentHandler.endDocument();
}
/**
* @see org.apache.uima.util.XMLizable#toXML(java.net.ContentHandler)
*/
public void toXML(ContentHandler aContentHandler) throws SAXException {
toXML(aContentHandler, false);
}
/**
* @see org.apache.uima.util.XMLizable#toXML(org.xml.sax.ContentHandler, boolean)
*/
public void toXML(ContentHandler aContentHandler, boolean aWriteDefaultNamespaceAttribute)
throws SAXException {
XmlizationInfo inf = getXmlizationInfo();
// write the element's start tag
// get attributes (can be provided by subclasses)
AttributesImpl attrs = getXMLAttributes();
// add default namespace attr if desired
if (aWriteDefaultNamespaceAttribute) {
if (inf.namespace != null) {
attrs.addAttribute("", "xmlns", "xmlns", null, inf.namespace);
}
}
// start element
aContentHandler.startElement(inf.namespace, inf.elementTagName, inf.elementTagName, attrs);
// write child elements
for (int i = 0; i < inf.propertyInfo.length; i++) {
PropertyXmlInfo propInf = inf.propertyInfo[i];
writePropertyAsElement(propInf, inf.namespace, aContentHandler);
}
// end element
aContentHandler.endElement(inf.namespace, inf.elementTagName, inf.elementTagName);
}
/**
* Called by the {@link toXML(Writer,String)} method to get the XML attributes that will be
* written as part of the element's tag. By default this method returns an empty Attributes
* object. Subclasses may override it in order to write attributes to the XML.
*
* @return an object defining the attributes to be written to the XML
*/
protected AttributesImpl getXMLAttributes() {
return new AttributesImpl();
}
/**
* To be implemented by subclasses to return information describing how to represent this object
* in XML.
*
* @return information defining this object's XML representation
*/
protected abstract XmlizationInfo getXmlizationInfo();
/**
* Looks in this class's XmlizationInfo for a property with the given XML element name.
*
* @param aXmlElementName
* the unqualified name of an XML element
*
* @return information on the property that corresponds to the given element name,
* <code>null</code> if none.
*/
protected PropertyXmlInfo getPropertyXmlInfo(String aXmlElementName) {
PropertyXmlInfo[] inf = getXmlizationInfo().propertyInfo;
for (int i = 0; i < inf.length; i++) {
if (aXmlElementName.equals(inf[i].xmlElementName))
return inf[i];
}
return null;
}
/**
* Utility method used to write a property out as an XML element.
*
* @param aPropInfo
* information on how to represent the property in XML
* @param aNamespace
* XML namespace URI for this object
* @param aContentHandler
* content handler to which this object will send events that describe its XML
* representation
*/
protected void writePropertyAsElement(PropertyXmlInfo aPropInfo, String aNamespace,
ContentHandler aContentHandler) throws SAXException {
// get value of property
Object val = getAttributeValue(aPropInfo.propertyName);
// if null or empty array, check to see if we're supposed to omit it
if (aPropInfo.omitIfNull
&& (val == null || (val.getClass().isArray() && ((Object[]) val).length == 0)))
return;
// if XML element name was supplied, write a tag
if (aPropInfo.xmlElementName != null) {
aContentHandler.startElement(aNamespace, aPropInfo.xmlElementName, aPropInfo.xmlElementName,
EMPTY_ATTRIBUTES);
}
// get class of property
Class propClass = getAttributeClass(aPropInfo.propertyName);
// if value is null then write nothing
if (val != null) {
// if value is an array then we have to treat that specially
if (val.getClass().isArray()) {
writeArrayPropertyAsElement(aPropInfo.propertyName, propClass, val,
aPropInfo.arrayElementTagName, aNamespace, aContentHandler);
} else {
// if value is an XMLizable object, call its toXML method
if (val instanceof XMLizable) {
((XMLizable) val).toXML(aContentHandler);
}
// else, if property's class is java.lang.Object, attempt to write
// it as a primitive
else if (propClass == Object.class) {
XMLUtils.writePrimitiveValue(val, aContentHandler);
} else {
// assume attribute's class is known (e.g. String, Integer), so it
// is not necessary to write the class name to the XML. Just write
// the string representation of the object
// XMLUtils.writeNormalizedString(val.toString(), aWriter, true);
String valStr = val.toString();
aContentHandler.characters(valStr.toCharArray(), 0, valStr.length());
}
}
}
// if XML element name was supplied, end the element that we started
if (aPropInfo.xmlElementName != null) {
aContentHandler.endElement(aNamespace, aPropInfo.xmlElementName, aPropInfo.xmlElementName);
}
}
/**
* Utility method used to write an array property out as an XML element.
*
* @param aPropName
* name of the attribute
* @param aPropClass
* class of the attribute
* @param aValue
* value (guaranteed to be an array and non-null)
* @param aArrayElementTagName
* name of tag to be assigned to each element of the array. May be <code>null</code>,
* in which case each element will be assigned a value appropriate to its class.
* @param aNamespace
* the XML namespace URI for this object
* @param aContentHandler
* the ContentHandler to which this object will write events that describe its XML
* representation
*/
protected void writeArrayPropertyAsElement(String aPropName, Class aPropClass, Object aValue,
String aArrayElementTagName, String aNamespace, ContentHandler aContentHandler)
throws SAXException {
// if aPropClass is generic Object, reader won't know whether to expect
// an array, so we tell it be writing an "array" element here.
if (aPropClass == Object.class) {
aContentHandler.startElement(aNamespace, "array", "array", EMPTY_ATTRIBUTES);
}
// iterate through elements of the array (at this point we don't allow
// nested arrays here
int len = ((Object[]) aValue).length;
for (int i = 0; i < len; i++) {
Object curElem = Array.get(aValue, i);
// if a particular array element tag has been specified, write it
if (aArrayElementTagName != null) {
aContentHandler.startElement(aNamespace, aArrayElementTagName, aArrayElementTagName,
EMPTY_ATTRIBUTES);
}
// if attribute's value is an XMLizable object, call its toXML method
if (curElem instanceof XMLizable) {
((XMLizable) curElem).toXML(aContentHandler);
}
// else, attempt to write it as a primitive
else {
if (aArrayElementTagName == null) {
// need to include the type, e.g. <string>
XMLUtils.writePrimitiveValue(curElem, aContentHandler);
} else {
// don't include the type - just write the value
String valStr = curElem.toString();
aContentHandler.characters(valStr.toCharArray(), 0, valStr.length());
}
}
// if we started an element, end it
if (aArrayElementTagName != null) {
aContentHandler.endElement(aNamespace, aArrayElementTagName, aArrayElementTagName);
}
}
// if we started an "Array" element, end it
if (aPropClass == Object.class) {
aContentHandler.endElement(aNamespace, "array", "array");
}
}
/**
* Utility method for writing to XML an property whose value is a <code>Map</code> with
* <code>String</code> keys and <code>XMLizable</code> values.
*
* @param aPropName
* name of the property to write to XML
* @param aXmlElementName
* name of the XML element for the property, <code>null</code> if none
* @param aKeyXmlAttributeName
* name of the XML attribute for the key
* @param aValueTagName
* XML element tag name to use for each entry in the Map
* @param aOmitIfNull
* if true, null or empty map will not be written at all, if false, null or empty map
* will be written as an empty element
* @param aNamespace
* namespace for this object
* @param aContentHandler
* ContentHandler to which this object will send events describing its XML representation
*/
protected void writeMapPropertyToXml(String aPropName, String aXmlElementName,
String aKeyXmlAttribute, String aValueTagName, boolean aOmitIfNull, String aNamespace,
ContentHandler aContentHandler) throws SAXException {
// get map
Map theMap = (Map) getAttributeValue(aPropName);
// if map is empty handle appropriately
if (theMap == null || theMap.isEmpty()) {
if (!aOmitIfNull && aXmlElementName != null) {
aContentHandler
.startElement(aNamespace, aXmlElementName, aXmlElementName, EMPTY_ATTRIBUTES);
aContentHandler.endElement(aNamespace, aXmlElementName, aXmlElementName);
}
} else {
// write start tag for attribute if desired
if (aXmlElementName != null) {
aContentHandler
.startElement(aNamespace, aXmlElementName, aXmlElementName, EMPTY_ATTRIBUTES);
}
// iterate over entries in the Map
Set entries = theMap.entrySet();
Iterator i = entries.iterator();
while (i.hasNext()) {
Map.Entry curEntry = (Map.Entry) i.next();
String key = (String) curEntry.getKey();
// write a tag for the value, with a "key" attribute
AttributesImpl attrs = new AttributesImpl();
attrs.addAttribute("", aKeyXmlAttribute, aKeyXmlAttribute, null, key); // are these nulls
// OK?
aContentHandler.startElement(aNamespace, aValueTagName, aValueTagName, attrs);
// write the value (must be XMLizable or an array of XMLizable)
Object val = curEntry.getValue();
if (val.getClass().isArray()) {
Object[] arr = (Object[]) val;
for (int j = 0; j < arr.length; j++) {
XMLizable elem = (XMLizable) arr[j];
elem.toXML(aContentHandler);
}
} else {
((XMLizable) val).toXML(aContentHandler);
}
// write end tag for the value
aContentHandler.endElement(aNamespace, aValueTagName, aValueTagName);
}
// if we wrote start tag for attribute, now write end tag
if (aXmlElementName != null) {
aContentHandler.endElement(aNamespace, aXmlElementName, aXmlElementName);
}
}
}
/**
* Initializes this object from its XML DOM representation. This method is typically called from
* the {@link XMLParser}.
*
* @param aElement
* the XML element that represents this object.
* @param aParser
* a reference to the UIMA <code>XMLParser</code>. The
* {@link XMLParser#buildObject(Element)} method can be used to construct sub-objects.
*
* @throws InvalidXMLException
* if the input XML element does not specify a valid object
*/
public final void buildFromXMLElement(Element aElement, XMLParser aParser)
throws InvalidXMLException {
buildFromXMLElement(aElement, aParser, new XMLParser.ParsingOptions(true));
}
/**
* Initializes this object from its XML DOM representation. This method is typically called from
* the {@link XMLParser}.
*
* @param aElement
* the XML element that represents this object.
* @param aParser
* a reference to the UIMA <code>XMLParser</code>. The
* {@link XMLParser#buildObject(Element)} method can be used to construct sub-objects.
* @param aOptions
* option settings
*
* @throws InvalidXMLException
* if the input XML element does not specify a valid object
*/
public void buildFromXMLElement(Element aElement, XMLParser aParser,
XMLParser.ParsingOptions aOptions) throws InvalidXMLException {
// check element type
if (!aElement.getTagName().equals(getXmlizationInfo().elementTagName))
throw new InvalidXMLException(InvalidXMLException.INVALID_ELEMENT_TYPE, new Object[] {
getXmlizationInfo().elementTagName, aElement.getTagName() });
// get child elements, each of which represents a property
List foundProperties = new ArrayList();
NodeList childNodes = aElement.getChildNodes();
for (int i = 0; i < childNodes.getLength(); i++) {
Node curNode = childNodes.item(i);
if (curNode instanceof Element) {
Element curElem = (Element) curNode;
String elemName = curElem.getTagName();
// look up this name in this class's XmlizationInfo
PropertyXmlInfo propXmlInfo = getPropertyXmlInfo(elemName);
if (propXmlInfo != null) {
// read the property's value from this element
readPropertyValueFromXMLElement(propXmlInfo, curElem, aParser, aOptions);
foundProperties.add(elemName);
} else {
// There is no property that matches the XML element.
// We have a couple of special cases to check before concluding that
// the XML is invalid.
// (1) if this class has only one property, we do not require
// specifying the property name as an XML element.
if (getXmlizationInfo().propertyInfo.length == 1) {
readPropertyValueFromXMLElement(getXmlizationInfo().propertyInfo[0], aElement, aParser,
aOptions);
} else {
// (2) if an object can be constructed from the unknown element,
// attempt to assign this object to any null-valued property
// that can accept it.
readUnknownPropertyValueFromXMLElement(curElem, aParser, aOptions, foundProperties);
}
}
}
}
}
/**
* Utility method to read an attribute's value from its DOM representation.
*
* @param aPropXmlInfo
* information about the property to read
* @param aElement
* DOM element to read from
* @param aParser
* parser to use to construct complex values
* @param aOptions
* option settings
*/
protected void readPropertyValueFromXMLElement(PropertyXmlInfo aPropXmlInfo, Element aElement,
XMLParser aParser, XMLParser.ParsingOptions aOptions) throws InvalidXMLException {
String propName = aPropXmlInfo.propertyName;
// get class of the property
Class propClass = getAttributeClass(propName);
// if we expect an array, treat that specially
if (propClass.isArray()) {
readArrayPropertyValueFromXMLElement(aPropXmlInfo, propClass, aElement, aParser, aOptions);
} else if (propClass == String.class) // special processing to handle env vars
{
String text = XMLUtils.getText(aElement, aOptions.expandEnvVarRefs);
setAttributeValue(propName, text);
} else {
// attempt to get the first child element, which represents the object
// that is the value of this attribute (there may not be one for a
// primitive type)
Element objElem = XMLUtils.getFirstChildElement(aElement);
if (objElem != null) {
// is it an array? (This can happen if aAttrClass is generic Object)
if (objElem.getTagName().equals("array")) {
readArrayPropertyValueFromXMLElement(aPropXmlInfo, Object.class, objElem, aParser,
aOptions);
} else {
setAttributeValue(propName, aParser.buildObjectOrPrimitive(objElem, aOptions));
}
} else {
// get text of the element and check for null
String text = XMLUtils.getText(aElement, aOptions.expandEnvVarRefs);
if (!text.equals("")) {
try {
// not null - attempt to construct an appropriate object from this String
// class must have a constructor that takes a String parameter
Constructor constructor = propClass.getConstructor(new Class[] { String.class });
// construct the object
Object val = constructor.newInstance(new Object[] { text });
setAttributeValue(propName, val);
} catch (Exception e) {
throw new InvalidXMLException(InvalidXMLException.UNKNOWN_ELEMENT,
new Object[] { aElement.getTagName() }, e);
}
}
}
}
}
/**
* Utility method to read an array property's value from its DOM representation.
*
* @param aPropXmlInfo
* information about the property to read
* @param aPropClass
* class of the property's value
* @param aElement
* DOM element representing the entire array
* @param aParser
* parser to use to construct complex values
* @param aOptions
* option settings
*/
protected void readArrayPropertyValueFromXMLElement(PropertyXmlInfo aPropXmlInfo,
Class aPropClass, Element aElement, XMLParser aParser, XMLParser.ParsingOptions aOptions)
throws InvalidXMLException {
Constructor primitiveElementStringConstructor = null; // may be used to build objects from
// strings
// get all child nodes (note not all may be elements)
NodeList elems = aElement.getChildNodes();
int numChildren = elems.getLength();
// iterate through children, and for each element construct a value,
// adding it to a list
List valueList = new ArrayList();
for (int i = 0; i < numChildren; i++) {
Node curNode = elems.item(i);
if (curNode instanceof Element) {
Element curElem = (Element) curNode;
// does the PropertyXmlInfo specify the expected tag name?
if (aPropXmlInfo.arrayElementTagName != null) {
if (curElem.getTagName().equals(aPropXmlInfo.arrayElementTagName)) {
// get text of element
String elemText = XMLUtils.getText(curElem, aOptions.expandEnvVarRefs);
// create appropriate primitive value
try {
// must have a constructor that takes a String parameter
if (primitiveElementStringConstructor == null) {
primitiveElementStringConstructor = aPropClass.getComponentType().getConstructor(
new Class[] { String.class });
}
// construct the object and add to list
valueList.add(primitiveElementStringConstructor
.newInstance(new Object[] { elemText }));
} catch (Exception e) {
throw new InvalidXMLException(e);
}
} else
// element type does not match
throw new InvalidXMLException(InvalidXMLException.INVALID_ELEMENT_TYPE, new Object[] {
aPropXmlInfo.arrayElementTagName, curElem.getTagName() });
} else {
// array element type is not specified, try defaults
valueList.add(aParser.buildObjectOrPrimitive(curElem, aOptions));
}
}
}
// initialize an appropriate array of the same length as the valueList,
// and copy the values
Class componentType = Object.class;
if (!(aPropClass == Object.class)) {
componentType = aPropClass.getComponentType();
// verify that objects are of appropriate type
Iterator i = valueList.iterator();
while (i.hasNext()) {
Object curObj = i.next();
if (!componentType.isAssignableFrom(curObj.getClass())) {
throw new InvalidXMLException(InvalidXMLException.INVALID_CLASS, new Object[] {
componentType, curObj.getClass() });
}
}
} else {
// attribute class is generic object, so we don't know what type of
// array to create. Try to infer it from the values - if they are all
// of the same type, use that, else use Object[].
Iterator i = valueList.iterator();
while (i.hasNext()) {
Object curObj = i.next();
if (componentType == Object.class) {
componentType = curObj.getClass();
} else if (componentType != curObj.getClass()) {
componentType = Object.class;
break;
}
}
}
Object array = Array.newInstance(componentType, valueList.size());
valueList.toArray((Object[]) array);
// assign this array as the value of the attribute
setAttributeValue(aPropXmlInfo.propertyName, array);
}
/**
* Utility method that attempts to read a property value from an XML element even though it is not
* known to which property the value should be assigned. If an object can be constructed from the
* XML element, it will be assigned to any unasigned property that can accept it.
*
* @param aElement
* DOM element to read from
* @param aParser
* parser to use to construct complex values
* @param aKnownPropertyNames
* List of propertiees that we've already values for (these values will not be
* overwritten)
*
* @throws InvalidXMLException
* if no acceptable object is described by aElement
*/
protected void readUnknownPropertyValueFromXMLElement(Element aElement, XMLParser aParser,
XMLParser.ParsingOptions aOptions, List aKnownPropertyNames) throws InvalidXMLException {
boolean success = false;
try {
Object valueObj = aParser.buildObjectOrPrimitive(aElement, aOptions);
if (valueObj != null) {
// find a property that can accept this type, which we have not already
// read a value for
PropertyXmlInfo[] props = getXmlizationInfo().propertyInfo;
for (int i = 0; i < props.length; i++) {
String propName = props[i].propertyName;
Class propClass = getAttributeClass(propName);
if (propClass.isAssignableFrom(valueObj.getClass())) {
// check if we have already read a value for this attribute
if (!aKnownPropertyNames.contains(propName)) {
// set value
setAttributeValue(propName, valueObj);
success = true;
break;
}
} else if (propClass.isArray()
&& propClass.getComponentType().isAssignableFrom(valueObj.getClass())) {
// it's an array - get current value and append
Object curVal = getAttributeValue(propName);
int curLen = curVal == null ? 0 : Array.getLength(curVal);
Object newVal = Array.newInstance(propClass.getComponentType(), curLen + 1);
if (curLen > 0) {
System.arraycopy(curVal, 0, newVal, 0, curLen);
}
Array.set(newVal, curLen, valueObj);
// set value
setAttributeValue(propName, newVal);
success = true;
break;
}
}
}
} catch (Exception e) {
if (e instanceof InvalidXMLException) {
throw (InvalidXMLException) e;
} else {
throw new InvalidXMLException(e);
}
}
// throw exception if we did not succeed
if (!success) {
throw new InvalidXMLException(InvalidXMLException.UNKNOWN_ELEMENT, new Object[] { aElement
.getTagName() });
}
}
/**
* Utility method for reading from XML an attribute whose value is a <code>Map</code> with
* <code>String</code> keys and <code>XMLizable</code> values.
*
* @param aPropName
* name of the property to read from XML
* @param aElement
* element to read from
* @param aKeyXmlAttribute
* XML attribute for the key
* @param aValueTagName
* XML element tag name for each entry in the map
* @param aParser
* parser to use to build sub-objects
* @param aOptions
* parsing option settings
* @param aValueIsArray
* true if the value of the map entires is an array. This method only supports
* homogeneous arrays.
*/
protected void readMapPropertyFromXml(String aPropName, Element aElement,
String aKeyXmlAttribute, String aValueTagName, XMLParser aParser,
XMLParser.ParsingOptions aOptions, boolean aValueIsArray) throws InvalidXMLException {
// get the Map to which we add entries (it should already exist)
Map theMap = (Map) getAttributeValue(aPropName);
// get all child nodes
NodeList childNodes = aElement.getChildNodes();
for (int i = 0; i < childNodes.getLength(); i++) {
Node curNode = childNodes.item(i);
if (curNode instanceof Element) {
Element curElem = (Element) curNode;
// check element tag name
if (!curElem.getTagName().equals(aValueTagName)) {
throw new InvalidXMLException(InvalidXMLException.INVALID_ELEMENT_TYPE, new Object[] {
aValueTagName, curElem.getTagName() });
}
// get the key attribute
String key = curElem.getAttribute(aKeyXmlAttribute);
if (key.equals("")) {
throw new InvalidXMLException(InvalidXMLException.REQUIRED_ATTRIBUTE_MISSING,
new Object[] { "key", aValueTagName });
}
// build value object
Object val = null;
if (!aValueIsArray) {
Element valElem = XMLUtils.getFirstChildElement(curElem);
if (valElem == null) {
throw new InvalidXMLException(InvalidXMLException.ELEMENT_NOT_FOUND, new Object[] {
"(any)", aValueTagName });
}
val = aParser.buildObject(valElem, aOptions);
} else // array
{
ArrayList vals = new ArrayList();
NodeList arrayNodes = curElem.getChildNodes();
for (int j = 0; j < arrayNodes.getLength(); j++) {
Node curArrayNode = arrayNodes.item(j);
if (curArrayNode instanceof Element) {
Element valElem = (Element) curArrayNode;
vals.add(aParser.buildObject(valElem));
}
}
if (!vals.isEmpty()) {
val = Array.newInstance(vals.get(0).getClass(), vals.size());
vals.toArray((Object[]) val);
}
}
// add object to the map
theMap.put(key, val);
}
}
}
/**
* Gets the wrapper class corresponding to the given primitive type. For example,
* <code>java.lang.Integer</code> is the wrapper class for the primitive type <code>int</code>.
*
* @param aPrimitiveType
* <code>Class</code> object representing a primitive type
*
* @return <code>Class</object> object representing the wrapper type for
* <code>PrimitiveType</code>. If <code>aPrimitiveType</code> is not
* a primitive type, it is itself returned.
*/
protected Class getWrapperClass(Class aPrimitiveType) {
if (Integer.TYPE.equals(aPrimitiveType))
return Integer.class;
else if (Short.TYPE.equals(aPrimitiveType))
return Short.class;
else if (Long.TYPE.equals(aPrimitiveType))
return Long.class;
else if (Byte.TYPE.equals(aPrimitiveType))
return Byte.class;
else if (Character.TYPE.equals(aPrimitiveType))
return Character.class;
else if (Float.TYPE.equals(aPrimitiveType))
return Float.class;
else if (Double.TYPE.equals(aPrimitiveType))
return Double.class;
else if (Boolean.TYPE.equals(aPrimitiveType))
return Boolean.class;
else
return aPrimitiveType;
}
/**
* Utility method that introspects this bean and returns a list of <code>PropertyDescriptor</code>s
* for its properties.
* <p>
* The JavaBeans introspector is used, with the IGNORE_ALL_BEANINFO flag. This saves on
* initialization time by preventing the introspector from searching for nonexistent BeanInfo
* classes for all the MetaDataObjects.
*
* @return the <code>PropertyDescriptors</code> for all properties introduced by subclasses of
* <code>MetaDataObject_impl</code>.
*
* @throw IntrospectionException if introspection fails
*/
protected PropertyDescriptor[] getPropertyDescriptors() throws IntrospectionException {
if (mPropertyDescriptors == null) {
mPropertyDescriptors = Introspector.getBeanInfo(this.getClass(),
Introspector.IGNORE_ALL_BEANINFO).getPropertyDescriptors();
}
return mPropertyDescriptors;
}
}