/*
* Copyright 2005 The Apache Software Foundation.
*
* Licensed 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 com.sun.org.apache.xerces.internal.xpointer;
import com.sun.org.apache.xerces.internal.impl.Constants;
import com.sun.org.apache.xerces.internal.impl.dv.XSSimpleType;
import com.sun.org.apache.xerces.internal.util.SymbolTable;
import com.sun.org.apache.xerces.internal.xni.Augmentations;
import com.sun.org.apache.xerces.internal.xni.QName;
import com.sun.org.apache.xerces.internal.xni.XMLAttributes;
import com.sun.org.apache.xerces.internal.xni.XNIException;
import com.sun.org.apache.xerces.internal.xs.AttributePSVI;
import com.sun.org.apache.xerces.internal.xs.XSTypeDefinition;
/**
* <p>
* Implements the XPointerPart interface and handles processing of
* ShortHand Pointers. It identifies at most one element in the
* resource's information set; specifically, the first one (if any)
* in document order that has a matching NCName as an identifier.
* </p>
*
* @version $Id: ShortHandPointer.java,v 1.1.4.1 2005/09/08 05:25:44 sunithareddy Exp $
*
*/
class ShortHandPointer implements XPointerPart {
// The name of the ShortHand pointer
private String fShortHandPointer;
// The name of the ShortHand pointer
private boolean fIsFragmentResolved = false;
// SymbolTable
private SymbolTable fSymbolTable;
//
// Constructors
//
public ShortHandPointer() {
}
public ShortHandPointer(SymbolTable symbolTable) {
fSymbolTable = symbolTable;
}
/**
* The XPointerProcessor takes care of this. Simply set the ShortHand Pointer here.
*
* @see com.sun.org.apache.xerces.internal.xpointer.XPointerPart#parseXPointer(java.lang.String)
*/
public void parseXPointer(String part) throws XNIException {
fShortHandPointer = part;
// reset fIsFragmentResolved
fIsFragmentResolved = false;
}
/**
* Resolves the XPointer ShortHand pointer based on the rules defined in
* Section 3.2 of the XPointer Framework Recommendation.
* Note that in the current implementation only supports DTD determined ID's.
*
* @see com.sun.org.apache.xerces.internal.xpointer.XPointerPart#resolveXPointer(com.sun.org.apache.xerces.internal.xni.QName, com.sun.org.apache.xerces.internal.xni.XMLAttributes, com.sun.org.apache.xerces.internal.xni.Augmentations, int event)
*/
int fMatchingChildCount = 0;
public boolean resolveXPointer(QName element, XMLAttributes attributes,
Augmentations augs, int event) throws XNIException {
// reset fIsFragmentResolved
if (fMatchingChildCount == 0) {
fIsFragmentResolved = false;
}
// On startElement or emptyElement, if no matching elements or parent
// elements were found, check for a matching idenfitier.
if (event == XPointerPart.EVENT_ELEMENT_START) {
if (fMatchingChildCount == 0) {
fIsFragmentResolved = hasMatchingIdentifier(element, attributes, augs,
event);
}
if (fIsFragmentResolved) {
fMatchingChildCount++;
}
} else if (event == XPointerPart.EVENT_ELEMENT_EMPTY) {
if (fMatchingChildCount == 0) {
fIsFragmentResolved = hasMatchingIdentifier(element, attributes, augs,
event);
}
}
else {
// On endElement, decrease the matching child count if the child or
// its parent was resolved.
if (fIsFragmentResolved) {
fMatchingChildCount--;
}
}
return fIsFragmentResolved ;
}
/**
*
* @param element
* @param attributes
* @param augs
* @param event
* @return
* @throws XNIException
*/
private boolean hasMatchingIdentifier(QName element,
XMLAttributes attributes, Augmentations augs, int event)
throws XNIException {
String normalizedValue = null;
// The identifiers of an element are determined by the
// ShortHand Pointer as follows:
if (attributes != null) {
for (int i = 0; i < attributes.getLength(); i++) {
// 1. If an element information item has an attribute information item
// among its [attributes] that is a schema-determined ID, then it is
// identified by the value of that attribute information item's
// [schema normalized value] property;
normalizedValue = getSchemaDeterminedID(attributes, i);
if (normalizedValue != null) {
break;
}
// 2. If an element information item has an element information item among
// its [children] that is a schema-determined ID, then it is identified by
// the value of that element information item's [schema normalized value] property;
// ???
normalizedValue = getChildrenSchemaDeterminedID(attributes, i);
if (normalizedValue != null) {
break;
}
// 3. If an element information item has an attribute information item among
// its [attributes] that is a DTD-determined ID, then it is identified by the
// value of that attribute information item's [normalized value] property.
// An attribute information item is a DTD-determined ID if and only if it has
// a [type definition] property whose value is equal to ID.
normalizedValue = getDTDDeterminedID(attributes, i);
if (normalizedValue != null) {
break;
}
// 4. No externally determined ID's
}
}
if (normalizedValue != null
&& normalizedValue.equals(fShortHandPointer)) {
return true;
}
return false;
}
/**
* Rerturns the DTD determine-ID
*
* @param attributes
* @param index
* @return String
* @throws XNIException
*/
public String getDTDDeterminedID(XMLAttributes attributes, int index)
throws XNIException {
if (attributes.getType(index).equals("ID")) {
return attributes.getValue(index);
}
return null;
}
/**
* Returns the schema-determined-ID.
*
*
* @param attributes
* @param index
* @return A String containing the schema-determined ID.
* @throws XNIException
*/
public String getSchemaDeterminedID(XMLAttributes attributes, int index)
throws XNIException {
Augmentations augs = attributes.getAugmentations(index);
AttributePSVI attrPSVI = (AttributePSVI) augs
.getItem(Constants.ATTRIBUTE_PSVI);
if (attrPSVI != null) {
// An element or attribute information item is a schema-determined
// ID if and only if one of the following is true:]
// 1. It has a [member type definition] or [type definition] property
// whose value in turn has [name] equal to ID and [target namespace]
// equal to http://www.w3.org/2001/XMLSchema;
// 2. It has a [base type definition] whose value has that [name] and [target namespace];
// 3. It has a [base type definition] whose value has a [base type definition]
// whose value has that [name] and [target namespace], and so on following
// the [base type definition] property recursively;
XSTypeDefinition typeDef = attrPSVI.getMemberTypeDefinition();
if (typeDef != null) {
typeDef = attrPSVI.getTypeDefinition();
}
//
if (typeDef != null && ((XSSimpleType) typeDef).isIDType()) {
return attrPSVI.getSchemaNormalizedValue();
}
// 4 & 5 NA
}
return null;
}
/**
* Not quite sure how this can be correctly implemented.
*
* @param attributes
* @param index
* @return String - We return null since we currenly do not supprt this.
* @throws XNIException
*/
public String getChildrenSchemaDeterminedID(XMLAttributes attributes,
int index) throws XNIException {
return null;
}
/**
*
* @see com.sun.org.apache.xerces.internal.xpointer.XPointerPart#isFragmentResolved()
*/
public boolean isFragmentResolved() {
return fIsFragmentResolved;
}
/**
*
* @see com.sun.org.apache.xerces.internal.xpointer.XPointerPart#isChildFragmentResolved()
*/
public boolean isChildFragmentResolved() {
return fIsFragmentResolved & ( fMatchingChildCount > 0);
}
/**
* Returns the name of the ShortHand pointer
*
* @see com.sun.org.apache.xerces.internal.xpointer.XPointerPart#getSchemeName()
*/
public String getSchemeName() {
return fShortHandPointer;
}
/**
* @see com.sun.org.apache.xerces.internal.xpointer.XPointerPart#getSchemeData()
*/
public String getSchemeData() {
return null;
}
/**
* @see com.sun.org.apache.xerces.internal.xpointer.XPointerPart#setSchemeName(java.lang.String)
*/
public void setSchemeName(String schemeName) {
fShortHandPointer = schemeName;
}
/**
* @see com.sun.org.apache.xerces.internal.xpointer.XPointerPart#setSchemeData(java.lang.String)
*/
public void setSchemeData(String schemeData) {
// NA
}
} |
