src.java.com.ctc.wstx.dtd.DTDSubsetImpl Maven / Gradle / Ivy
/* Woodstox XML processor
*
* Copyright (c) 2004- Tatu Saloranta, [email protected]
*
* Licensed under the License specified in file LICENSE, included with
* the source code.
* You may not use this file except in compliance with the License.
*
* 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.ctc.wstx.dtd;
import java.text.MessageFormat;
import java.util.*;
import javax.xml.stream.Location;
import javax.xml.stream.XMLStreamException;
import org.codehaus.stax2.validation.*;
import com.ctc.wstx.compat.JdkFeatures;
import com.ctc.wstx.cfg.ErrorConsts;
import com.ctc.wstx.ent.NotationDecl;
import com.ctc.wstx.exc.WstxParsingException;
import com.ctc.wstx.sr.InputProblemReporter;
import com.ctc.wstx.util.DataUtil;
/**
* The default implementation of {@link DTDSubset}
*/
public final class DTDSubsetImpl
extends DTDSubset
{
/**
* Whether this subset is cachable. Only those external
* subsets that do not refer to PEs defined by internal subsets (or
* GEs via default attribute value expansion) are cachable.
*/
final boolean mIsCachable;
/**
* Whether this subset has full validation information; and
* consequently whether it will do actual validation, or just allow
* access to type information, notations, entities, and add default
* attribute values.
*/
final boolean mFullyValidating;
/**
* Flag that indicates whether any of the elements declarared
* has any attribute default values for namespace pseudo-attributes.
*/
final boolean mHasNsDefaults;
/*
//////////////////////////////////////////////////////
// Entity information
//////////////////////////////////////////////////////
*/
/**
* Map (name-to-EntityDecl) of general entity declarations (internal,
* external) for this DTD subset.
*/
final HashMap mGeneralEntities;
/**
* Lazily instantiated List that contains all notations from
* {@link #mGeneralEntities} (preferably in their declaration order; depends
* on whether platform, ie. JDK version, has insertion-ordered
* Maps available), used by DTD event Objects.
*/
volatile transient List mGeneralEntityList = null;
/**
* Set of names of general entities references by this subset. Note that
* only those GEs that are referenced by default attribute value
* definitions count, since GEs in text content are only expanded
* when reading documents, but attribute default values are expanded
* when reading DTD subset itself.
*
* Needed
* for determinining if external subset materially depends on definitions
* from internal subset; if so, such subset is not cachable.
* This also
* means that information is not stored for non-cachable instance.
*/
final Set mRefdGEs;
// // // Parameter entity info:
/**
* Map (name-to-WEntityDeclaration) that contains all parameter entities
* defined by this subset. May be empty if such information will not be
* needed for use; for example, external subset's definitions are needed,
* nor are combined DTD set's.
*/
final HashMap mDefinedPEs;
/**
* Set of names of parameter entities references by this subset. Needed
* when determinining if external subset materially depends on definitions
* from internal subset, which is needed to know when caching external
* subsets.
*
* Needed
* for determinining if external subset materially depends on definitions
* from internal subset; if so, such subset is not cachable.
* This also
* means that information is not stored for non-cachable instance.
*/
final Set mRefdPEs;
/*
//////////////////////////////////////////////////////
// Notation definitions:
//////////////////////////////////////////////////////
*/
/**
* Map (name-to-NotationDecl) that this subset has defined.
*/
final HashMap mNotations;
/**
* Lazily instantiated List that contains all notations from
* {@link #mNotations} (preferably in their declaration order; depends
* on whether platform, ie. JDK version, has insertion-ordered
* Maps available), used by DTD event Objects.
*/
transient List mNotationList = null;
/*
//////////////////////////////////////////////////////
// Element definitions:
//////////////////////////////////////////////////////
*/
final HashMap mElements;
/*
//////////////////////////////////////////////////////
// Life-cycle
//////////////////////////////////////////////////////
*/
private DTDSubsetImpl(boolean cachable,
HashMap genEnt, Set refdGEs,
HashMap paramEnt, Set peRefs,
HashMap notations, HashMap elements,
boolean fullyValidating)
{
mIsCachable = cachable;
mGeneralEntities = genEnt;
mRefdGEs = refdGEs;
mDefinedPEs = paramEnt;
mRefdPEs = peRefs;
mNotations = notations;
mElements = elements;
mFullyValidating = fullyValidating;
boolean anyNsDefs = false;
if (elements != null) {
Iterator it = elements.values().iterator();
while (it.hasNext()) {
DTDElement elem = (DTDElement) it.next();
if (elem.hasNsDefaults()) {
anyNsDefs = true;
break;
}
}
}
mHasNsDefaults = anyNsDefs;
}
public static DTDSubsetImpl constructInstance(boolean cachable,
HashMap genEnt, Set refdGEs,
HashMap paramEnt, Set refdPEs,
HashMap notations, HashMap elements,
boolean fullyValidating)
{
return new DTDSubsetImpl(cachable, genEnt, refdGEs,
paramEnt, refdPEs,
notations, elements,
fullyValidating);
}
/**
* Method that will combine definitions from internal and external subsets,
* producing a single DTD set.
*/
public DTDSubset combineWithExternalSubset(InputProblemReporter rep, DTDSubset extSubset)
throws XMLStreamException
{
/* First let's see if we can just reuse GE Map used by int or ext
* subset; (if only one has contents), or if not, combine them.
*/
HashMap ge1 = getGeneralEntityMap();
HashMap ge2 = extSubset.getGeneralEntityMap();
if (ge1 == null || ge1.isEmpty()) {
ge1 = ge2;
} else {
if (ge2 != null && !ge2.isEmpty()) {
/* Internal subset Objects are never shared or reused (and by
* extension, neither are objects they contain), so we can just
* modify GE map if necessary
*/
combineMaps(ge1, ge2);
}
}
// Ok, then, let's combine notations similarly
HashMap n1 = getNotationMap();
HashMap n2 = extSubset.getNotationMap();
if (n1 == null || n1.isEmpty()) {
n1 = n2;
} else {
if (n2 != null && !n2.isEmpty()) {
/* First; let's make sure there are no colliding notation
* definitions: it's an error to try to redefine notations.
*/
checkNotations(n1, n2);
/* Internal subset Objects are never shared or reused (and by
* extension, neither are objects they contain), so we can just
* modify notation map if necessary
*/
combineMaps(n1, n2);
}
}
// And finally elements, rather similarly:
HashMap e1 = getElementMap();
HashMap e2 = extSubset.getElementMap();
if (e1 == null || e1.isEmpty()) {
e1 = e2;
} else {
if (e2 != null && !e2.isEmpty()) {
/* Internal subset Objects are never shared or reused (and by
* extension, neither are objects they contain), so we can just
* modify element map if necessary
*/
combineElements(rep, e1, e2);
}
}
/* Combos are not cachable, and because of that, there's no point
* in storing any PE info either.
*/
return constructInstance(false, ge1, null, null, null, n1, e1,
mFullyValidating);
}
/*
//////////////////////////////////////////////////////
// XMLValidationSchema implementation
//////////////////////////////////////////////////////
*/
public XMLValidator createValidator(ValidationContext ctxt)
throws XMLStreamException
{
if (mFullyValidating) {
return new DTDValidator(this, ctxt, mHasNsDefaults,
getElementMap(), getGeneralEntityMap());
}
return new DTDTypingNonValidator(this, ctxt, mHasNsDefaults,
getElementMap(), getGeneralEntityMap());
}
/*
//////////////////////////////////////////////////////
// DTDValidationSchema implementation
//////////////////////////////////////////////////////
*/
public int getEntityCount() {
return (mGeneralEntities == null) ? 0 : mGeneralEntities.size();
}
public int getNotationCount() {
return (mNotations == null) ? 0 : mNotations.size();
}
/*
//////////////////////////////////////////////////////
// Woodstox-specific public API
//////////////////////////////////////////////////////
*/
public boolean isCachable() {
return mIsCachable;
}
public HashMap getGeneralEntityMap() {
return mGeneralEntities;
}
public List getGeneralEntityList()
{
List l = mGeneralEntityList;
if (l == null) {
if (mGeneralEntities == null || mGeneralEntities.size() == 0) {
l = JdkFeatures.getInstance().getEmptyList();
} else {
l = Collections.unmodifiableList(new ArrayList(mGeneralEntities.values()));
}
mGeneralEntityList = l;
}
return l;
}
public HashMap getParameterEntityMap() {
return mDefinedPEs;
}
public HashMap getNotationMap() {
return mNotations;
}
public synchronized List getNotationList()
{
List l = mNotationList;
if (l == null) {
if (mNotations == null || mNotations.size() == 0) {
l = JdkFeatures.getInstance().getEmptyList();
} else {
l = Collections.unmodifiableList(new ArrayList(mNotations.values()));
}
mNotationList = l;
}
return l;
}
public HashMap getElementMap() {
return mElements;
}
/**
* Method used in determining whether cached external subset instance
* can be used with specified internal subset. If ext. subset references
* any parameter/general entities int subset (re-)defines, it can not;
* otherwise it can be used.
*
* @return True if this (external) subset refers to a parameter entity
* defined in passed-in internal subset.
*/
public boolean isReusableWith(DTDSubset intSubset)
{
Set refdPEs = mRefdPEs;
if (refdPEs != null && refdPEs.size() > 0) {
HashMap intPEs = intSubset.getParameterEntityMap();
if (intPEs != null && intPEs.size() > 0) {
if (DataUtil.anyValuesInCommon(refdPEs, intPEs.keySet())) {
return false;
}
}
}
Set refdGEs = mRefdGEs;
if (refdGEs != null && refdGEs.size() > 0) {
HashMap intGEs = intSubset.getGeneralEntityMap();
if (intGEs != null && intGEs.size() > 0) {
if (DataUtil.anyValuesInCommon(refdGEs, intGEs.keySet())) {
return false;
}
}
}
return true; // yep, no dependencies overridden
}
/*
//////////////////////////////////////////////////////
// Overridden default methods:
//////////////////////////////////////////////////////
*/
public String toString() {
StringBuffer sb = new StringBuffer();
sb.append("[DTDSubset: ");
int count = getEntityCount();
sb.append(count);
sb.append(" general entities");
sb.append(']');
return sb.toString();
}
/*
//////////////////////////////////////////////////////
// Convenience methods used by other classes
//////////////////////////////////////////////////////
*/
public static void throwNotationException(NotationDecl oldDecl, NotationDecl newDecl)
throws XMLStreamException
{
throw new WstxParsingException
(MessageFormat.format(ErrorConsts.ERR_DTD_NOTATION_REDEFD,
new Object[] {
newDecl.getName(),
oldDecl.getLocation().toString()}),
newDecl.getLocation());
}
public static void throwElementException(DTDElement oldElem, Location loc)
throws XMLStreamException
{
throw new WstxParsingException
(MessageFormat.format(ErrorConsts.ERR_DTD_ELEM_REDEFD,
new Object[] {
oldElem.getDisplayName(),
oldElem.getLocation().toString() }),
loc);
}
/*
//////////////////////////////////////////////////////
// Internal methods
//////////////////////////////////////////////////////
*/
/**
*
* Note: The first Map argument WILL be modified; second one
* not. Caller needs to ensure this is acceptable.
*/
private static void combineMaps(HashMap m1, HashMap m2)
{
Iterator it = m2.entrySet().iterator();
while (it.hasNext()) {
Map.Entry me = (Map.Entry) it.next();
Object key = me.getKey();
/* Int. subset has precedence, but let's guess most of
* the time there are no collisions:
*/
Object old = m1.put(key, me.getValue());
// Oops, got value! Let's put it back
if (old != null) {
m1.put(key, old);
}
}
}
/**
* Method that will try to merge in elements defined in the external
* subset, into internal subset; it will also check for redeclarations
* when doing this, as it's invalid to redeclare elements. Care has to
* be taken to only check actual redeclarations: placeholders should
* not cause problems.
*/
private void combineElements(InputProblemReporter rep, HashMap intElems, HashMap extElems)
throws XMLStreamException
{
Iterator it = extElems.entrySet().iterator();
while (it.hasNext()) {
Map.Entry me = (Map.Entry) it.next();
Object key = me.getKey();
Object extVal = me.getValue();
Object oldVal = intElems.get(key);
// If there was no old value, can just merge new one in and continue
if (oldVal == null) {
intElems.put(key, extVal);
continue;
}
DTDElement extElem = (DTDElement) extVal;
DTDElement intElem = (DTDElement) oldVal;
// Which one is defined (if either)?
if (extElem.isDefined()) { // one from the ext subset
if (intElem.isDefined()) { // but both can't be; that's an error
throwElementException(intElem, extElem.getLocation());
} else {
/* Note: can/should not modify the external element (by
* for example adding attributes); external element may
* be cached and shared... so, need to do the reverse,
* define the one from internal subset.
*/
intElem.defineFrom(rep, extElem, mFullyValidating);
}
} else {
if (!intElem.isDefined()) {
/* ??? Should we warn about neither of them being really
* declared?
*/
rep.reportProblem(ErrorConsts.WT_ENT_DECL,
ErrorConsts.W_UNDEFINED_ELEM,
extElem.getDisplayName(), null,
intElem.getLocation());
} else {
intElem.mergeMissingAttributesFrom(rep, extElem, mFullyValidating);
}
}
}
}
private static void checkNotations(HashMap fromInt, HashMap fromExt)
throws XMLStreamException
{
/* Since it's external subset that would try to redefine things
* defined in internal subset, let's traverse definitions in
* the ext. subset first (even though that may not be the fastest
* way), so that we have a chance of catching the first problem
* (As long as Maps iterate in insertion order).
*/
Iterator it = fromExt.entrySet().iterator();
while (it.hasNext()) {
Map.Entry en = (Map.Entry) it.next();
if (fromInt.containsKey(en.getKey())) {
throwNotationException((NotationDecl) fromInt.get(en.getKey()),
(NotationDecl) en.getValue());
}
}
}
}