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/*
* 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.xerces.impl.xs.models;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.apache.xerces.impl.Constants;
import org.apache.xerces.impl.dv.xs.EqualityHelper;
import org.apache.xerces.impl.xs.SchemaGrammar;
import org.apache.xerces.impl.xs.SubstitutionGroupHandler;
import org.apache.xerces.impl.xs.XSConstraints;
import org.apache.xerces.impl.xs.XSElementDecl;
import org.apache.xerces.impl.xs.XSElementDeclHelper;
import org.apache.xerces.impl.xs.XSGrammarBucket;
import org.apache.xerces.impl.xs.XSOpenContentDecl;
import org.apache.xerces.impl.xs.XSWildcardDecl;
import org.apache.xerces.impl.xs.identity.IdentityConstraint;
import org.apache.xerces.impl.xs.util.XS11TypeHelper;
import org.apache.xerces.xni.QName;
import org.apache.xerces.xs.XSConstants;
import org.apache.xerces.xs.XSNamedMap;
// TODO: tests:
// * base all: (e, w?)?; derived all: (e)? w. Should be invalid
// * base all: (e/f, w); derived all: (e, w)
// * base: e|w(lax) + w(skip), derived: w(lax) + w(skip)
// Example test:
// Bad: base: ((a|b)&) derived: (a & b).
// derive allow a,b, base doesn't.
// Bad: base: ((ns1:a|ns2:b) & ns1:*) derived: (ns1:a & ns2:b).
// derive allow a,b, base doesn't.
// Good: base: ((ns1:a|ns2:b) & ns1:*? & ns2:*?) derived: (ns1:a & ns2:b).
// base: (a{2} & *), derived: (a & *)
/**
* @xerces.internal
*
* @version $Id: XS11CMRestriction.java 1446413 2013-02-15 00:37:09Z mukulg $
*/
public final class XS11CMRestriction implements XSElementDeclHelper {
private final SubstitutionGroupHandler sgh;
private final XSGrammarBucket gb;
private final CMBuilder cmb;
private final XSConstraints xsc;
// Content models to be checked
private XS11CM base, derived;
// Used when both base and derived are "all" groups
private XS11AllCM allb, alld;
// Used when base is "dfa" and derived is "all"
private XSDFACM dfab;
// Temporary QName object
private final QName qname = new QName();
// Pairs of matching states from base and derived.
private final List states = new ArrayList();
// A pair of matching states.
private StatePair pair = null;
// The following field represents a wildcard. It's typically a wildcad
// from the derived type. We keep subtract matching components in the base
// from this wildcard.
private short wType;
private final List wNSList = new ArrayList();
private final List wNSListTemp = new ArrayList();
// Disallowed name list
private final List wDNList = new ArrayList();
// ##sibling and ##defined
private boolean wDD, wDS;
// Allowed name list, used after subtracting a disallowed list.
private final List wANList = new ArrayList();
// List of QNames used for ##sibling and ##defined checking
private List globals;
private List siblingsB;
private List siblingsD;
// Element/wildcard decls in base and derived
private XSElementDecl eb, ed;
private XSWildcardDecl wb, wd;
// Current/next states in base and derived.
private int[] b, bn, d, dn;
// Index of the previously matched decl in base and derived, so that we
// know where to continue.
private final int[] indexb = new int[1], indexd = new int[1];
// Optimization. If an element declaration in derived is the same as an
// element declaration in base without using any substitution group, then
// we don't need to dig into the sub-groups. They will be the same.
private boolean matchedHead;
// Interface implemented by the content model classes
interface XS11CM extends XSCMValidator {
// Find the next possible element transition.
// "s" is the current state, "sn" is the next state after the transition,
// "index" has info about where to start looking, and stores the index
// of the new declaration if one is found, or -1.
// Returns the matching decl, or null.
public XSElementDecl nextElementTransition(int[] s, int[] sn, int[] index);
// Find the next possible wildcard transition, including open content.
public XSWildcardDecl nextWildcardTransition(int[] s, int[] sn, int[] index);
// Check whether a matched wildcard is an open content.
public boolean isOpenContent(XSWildcardDecl w);
// Check whether a QName is allowed by a wildcard in the content model.
// Need to check namespace, local name, ##sibling, and ##defined.
public boolean allowExpandedName(XSWildcardDecl wildcard,
QName name, SubstitutionGroupHandler sgh,
XSElementDeclHelper edh);
// Get the list of names known to the content model, for ##sibling.
public List getDefinedNames(SubstitutionGroupHandler sgh);
// Before putting a pair of states into the list, give the content
// model a chance to optimize. If a set of states can be folded into
// a single one, the content model can change the state int arrays
// to represent the one state. e.g. if both base and derived have
// the same element declaration with the same min/maxOccurs information,
// then we don't have to have many different states.
// Currently this is only implemented by DFA.
public void optimizeStates(XS11CM base, int[] b, int[] d, int indexb);
}
public XS11CMRestriction(XSCMValidator base, XSCMValidator derived,
SubstitutionGroupHandler sgh, XSGrammarBucket gb,
CMBuilder cmb, XSConstraints xsc) {
this.base = (XS11CM)base;
this.derived = (XS11CM)derived;
this.sgh = sgh;
this.gb = gb;
this.cmb = cmb;
this.xsc = xsc;
}
// Helper: add a pair of states to the list, if such pair is not already
// in the list.
private void addState() {
// Optimize the states when possible.
derived.optimizeStates(base, bn, dn, indexb[0]);
// Reuse the "pair" object
if (pair == null) {
pair = new StatePair(bn, dn);
}
else {
pair.set(bn, dn);
}
// Only add if the pair isn't already in the list
if (!states.contains(pair)) {
states.add(pair);
pair = null;
}
}
// Helper: copy a derived wildcard to fields of this class.
private void copyDerivedWildcard() {
wType = wd.fType;
wDD = wd.fDisallowedDefined;
wDS = wd.fDisallowedSibling;
wNSList.clear();
if (wType == XSWildcardDecl.NSCONSTRAINT_ANY) {
// "any" is the same as "not" + empty namespace list.
wType = XSWildcardDecl.NSCONSTRAINT_NOT;
}
else {
int size = wd.fNamespaceList == null ? 0 : wd.fNamespaceList.length;
for (int i = 0; i < size; i++) {
wNSList.add(wd.fNamespaceList[i]);
}
}
// Copy disallowed name list
// Don't clear, because the list is pre-populated with element names
int size = wd.fDisallowedNamesList == null ? 0 : wd.fDisallowedNamesList.length;
for (int i = 0; i < size; i++) {
wDNList.add(wd.fDisallowedNamesList[i].uri);
wDNList.add(wd.fDisallowedNamesList[i].localpart);
}
// Allowed name list starts as empty
wANList.clear();
}
// Helper: add a name to the "allowed" list
private void addAN(String ns, String name) {
// Only add if it's allowed by the current wildcard
if (!allowNS(ns)) {
return;
}
// Only add if the name is not in the disallowed name list.
for (int i = 0; i < wDNList.size();) {
if (wDNList.get(i++) == ns && wDNList.get(i++) == name) {
return;
}
}
// Only add if the name is allowed by the wildcard in terms of
// ##sibling and ##defined.
qname.uri = ns;
qname.localpart = name;
if (!derived.allowExpandedName(wd, qname, sgh, this)) {
return;
}
// The name is allowed, add it.
wANList.add(ns);
wANList.add(name);
}
// Helper: check whether a namespace name is allowed by the wildcard
private boolean allowNS(String ns) {
return wType == XSWildcardDecl.NSCONSTRAINT_ANY ||
wType == XSWildcardDecl.NSCONSTRAINT_NOT && !wNSList.contains(ns) ||
wType == XSWildcardDecl.NSCONSTRAINT_LIST && wNSList.contains(ns);
}
// Helper: check whether a name is allowed by the current wildcard
private boolean allowName(String ns, String name) {
// Check namespace first
if (!allowNS(ns)) {
return false;
}
// Whether the name is in the disallowed list
for (int i = 0; i < wDNList.size(); i+=2) {
if (ns == wDNList.get(i) && name == wDNList.get(i+1)) {
return false;
}
}
// Whether the name is in the allowed list
for (int i = 0; i < wANList.size(); i+=2) {
if (ns == wANList.get(i) && name == wANList.get(i+1)) {
return true;
}
}
// Additional ##sibling and ##defined checks
qname.uri = ns;
qname.localpart = name;
return derived.allowExpandedName(wd, qname, sgh, this);
}
// Helper: whether the current wildcard is empty: allows nothing
private boolean emptyWildcard() {
// Only when the list of namespace and the list of allowed names are
// both empty.
return wType == XSWildcardDecl.NSCONSTRAINT_LIST &&
wNSList.size() == 0 && wANList.size() == 0;
}
// Helper: get all defined elements. For ##defined.
private void getGlobalElements() {
globals = new ArrayList();
SchemaGrammar[] sgs = gb.getGrammars();
for (int i = 0; i < sgs.length; i++) {
addGlobals(sgs[i]);
}
}
// Helper: get all defined elements in a given namespace. For ##defined.
private void addGlobals(SchemaGrammar g) {
XSNamedMap map = g.getComponents(XSConstants.ELEMENT_DECLARATION);
for (int i = 0; i < map.getLength(); i++) {
XSElementDecl e = (XSElementDecl)map.item(i);
globals.add(e.fTargetNamespace);
globals.add(e.fName);
}
}
// Helper: get all known names in the base content model. For ##sibling.
private void getBaseSiblings() {
siblingsB = base.getDefinedNames(sgh);
}
// Helper: get all known names in the derived content model. For ##sibling.
private void getDerivedSiblings() {
siblingsD = derived.getDefinedNames(sgh);
}
// Helper: get a global element declaration with the specified name.
public XSElementDecl getGlobalElementDecl(QName name) {
SchemaGrammar sg = gb.getGrammar(name.uri);
return sg != null ? sg.getGlobalElementDecl(name.localpart) : null;
}
// Entry point: check the content models passed in to the constructor.
public boolean check() {
// Initialize the states. Needs this before the "derived is all" check,
// because these state arrays are always needed.
b = base.startContentModel();
bn = base.startContentModel();
d = derived.startContentModel();
dn = derived.startContentModel();
// If derived is all, then we may be able to do better than treating
// it as a DFA.
if (derived instanceof XS11AllCM) {
alld = (XS11AllCM)derived;
// True: valid; False: invalid; null: need further checking
Boolean res = checkAllDerived();
if (res != null) {
return res.booleanValue();
}
}
// Helper list to gather all names that can't match the wildcard
// in derived, because the wildcard is weaker than the elements.
List excludedElementsCopy = new ArrayList();
// For every state in derived, find the corresponding states in base.
// For each pair of corresponding states, make sure all transitions
// allowed by derived are also allowed by base. The target states
// are also treated as "corresponding states". Continue for all such
// pairs. When derived is at a final state, the corresponding state
// for base must also be a final state.
// Handling the list of state pairs as a list, not a stack.
// Otherwise we may pop a pair off the stack, but latter find the same
// pair, but there is no way to know we've already seen that pair.
// the number of processed state pairs.
int pos = 0;
// initialize the unprocessed set: put initial states in it
StatePair p = new StatePair(b, d);
states.add(p);
// while there is unprocessed pair
while (pos < states.size()) {
StatePair sp = (StatePair)states.get(pos++);
sp.getStates(b, d);
// for all possible element edges
excludedElementsCopy.clear();
indexd[0] = -1;
while ((ed = derived.nextElementTransition(d, dn, indexd)) != null) {
// Add them to the "can't match wildcard name" list
excludedElementsCopy.add(ed.fTargetNamespace);
excludedElementsCopy.add(ed.fName);
if (ed.getScope() == XSConstants.SCOPE_GLOBAL) {
XSElementDecl[] eds = sgh.getSubstitutionGroup(ed, Constants.SCHEMA_VERSION_1_1);
for (int j = 0; j < eds.length; j++) {
excludedElementsCopy.add(eds[j].fTargetNamespace);
excludedElementsCopy.add(eds[j].fName);
}
}
// Make sure this element is allowed by the base
if (!matchElementInBase()) {
return false;
}
}
// for all possible wildcard edges
indexd[0] = -1;
while ((wd = derived.nextWildcardTransition(d, dn, indexd)) != null) {
// Put all the stronger element names in the disallowed list
wDNList.clear();
wDNList.addAll(excludedElementsCopy);
// And make sure the wildcard is allowed by the base
if (!matchWildcardInBase()) {
return false;
}
}
}
// We processed all state pairs. Now check final states.
return checkFinalStates();
}
// for an element and all elements in its sub group, check whether
// there are matching edges in the base.
private boolean matchElementInBase() {
matchedHead = false;
// Look for an element decl in the base
if (!findElementInBase()) {
// There is a route in the derived, but no matching
// route in the base. not a valid restriction.
return false;
}
// put this pair in the unprocessed states, if it's not there
addState();
// Same element decl as derived, no need to look at sub-group.
if (matchedHead) {
return true;
}
// get all sub group elements
XSElementDecl[] eds = sgh.getSubstitutionGroup(ed, Constants.SCHEMA_VERSION_1_1);
for (int i = 0; i < eds.length; i++) {
ed = eds[i];
// check whether there is a matching edge
if (!findElementInBase()) {
// if not, there is a route in the derived, but no matching
// route in the base. not a valid restriction.
return false;
}
// put this pair in the unprocessed states, if it's not there
addState();
}
return true;
}
// find the matching next state in the base
private boolean findElementInBase() {
// for all edges in the base that leaves the base state
// check whether it's an edge matching the base edge.
// if it is, return the next state.
indexb[0] = -1;
while ((eb = base.nextElementTransition(b, bn, indexb)) != null) {
// Base element edge, check whether it matches the derived element
if (matchElementWithBaseElement()) {
// If name matches, check type, nil, fixed etc.
return checkEERestriction();
}
}
// No matching element edge, try wildcards.
indexb[0] = -1;
while ((wb = base.nextWildcardTransition(b, bn, indexb)) != null) {
// Base wildcard edge, check whether it matches the derived element
qname.uri = ed.fTargetNamespace;
qname.localpart = ed.fName;
if (base.allowExpandedName(wb, qname, sgh, this)) {
// If name matches, check whether there is a matching global.
return checkEWRestriction();
}
}
return false;
}
// whether 2 element edges match
private boolean matchElementWithBaseElement() {
if (eb.getName() == ed.getName() && eb.getNamespace() == ed.getNamespace()) {
// The elements match without using sub-groups. Remember this fact
// so that we know we don't need to check sub-groups.
matchedHead = eb == ed;
return true;
}
// if the name doesn't match, try its sub group elements
XSElementDecl[] ebs = sgh.getSubstitutionGroup(eb, Constants.SCHEMA_VERSION_1_1);
for (int i = 0; i < ebs.length; i++) {
if (ebs[i].getName() == ed.getName() &&
ebs[i].getNamespace() == ed.getNamespace()) {
eb = ebs[i];
return true;
}
}
return false;
}
private boolean checkEERestriction() {
if (eb == ed) {
return true;
}
// 4.1 Either G.{nillable} = true or S.{nillable} = false.
if (!eb.getNillable() && ed.getNillable()) {
return false;
}
// 4.2 Either G has no {value constraint}, or it is not fixed,
// or S has a fixed {value constraint} with an equal value.
if (eb.getConstraintType() == XSConstants.VC_FIXED) {
// derived one has to have a fixed value
if (ed.getConstraintType() != XSConstants.VC_FIXED) {
return false;
}
// The 2 values must have the same primitive kind and actual value.
// equals() checks both equality and identity.
if (!EqualityHelper.isEqual(eb.fDefault, ed.fDefault, Constants.SCHEMA_VERSION_1_1)) {
return false;
}
}
// 4.3 S.{identity-constraint definitions} is a superset of G.{identity-constraint definitions}.
if (!checkIDConstraintRestriction(ed, eb)) {
return false;
}
// 4.4 S disallows a superset of the substitutions that G does.
if ((ed.fBlock & eb.fBlock) != eb.fBlock) {
return false;
}
// 4.5 S's declared {type definition} is ·validly substitutable as
// a restriction· for G's declared {type definition}.
if (!xsc.checkTypeDerivationOk(ed.fType, eb.fType,
(short)(XSConstants.DERIVATION_EXTENSION|XSConstants.DERIVATION_LIST|XSConstants.DERIVATION_UNION))) {
return false;
}
// 4.6 S.{type table} and G.{type table} either are both absent or
// are both present and equivalent.
if (XS11TypeHelper.isTypeTablesComparable(eb.getTypeAlternatives(), ed.getTypeAlternatives()) && !xsc.isTypeTablesEquivalent(eb, ed)) {
return false;
}
return true;
}
private boolean checkIDConstraintRestriction(XSElementDecl derivedElemDecl,
XSElementDecl baseElemDecl) {
IdentityConstraint[] idcd = derivedElemDecl.getIDConstraints();
IdentityConstraint[] idcb = baseElemDecl.getIDConstraints();
int sizeb = idcb == null ? 0 : idcb.length;
int sized = idcd == null ? 0 : idcd.length;
// For each IDC in the base, look for the same IDC in derived
for (int b = 0; b < sizeb; b++) {
int d = 0;
for (; d < sized; d++) {
if (idcb[b] == idcd[d]) {
break;
}
}
// Didn't find a match, error.
if (d == idcd.length) {
return false;
}
}
return true;
}
// whether 2 edges match
private boolean checkEWRestriction() {
// 1 G is skip.
if (wb.getProcessContents() == XSWildcardDecl.PC_SKIP) {
return true;
}
qname.uri = ed.fTargetNamespace;
qname.localpart = ed.fName;
eb = getGlobalElementDecl(qname);
if (eb == null) {
// 2 G is lax and S is not skip.
return wb.getProcessContents() == XSWildcardDecl.PC_LAX;
}
else {
// 4 G and S are both Element Declarations and all of the following are true:
return checkEERestriction();
}
}
private boolean matchWildcardInBase() {
// For each wildcard in derived, subtract stronger elements first,
// then look for matches in base, in the order of element, wildcard,
// then open content.
// Copy the derived wildcard into fields of this class, so that we can
// start subtract parts that have matches in the base.
// The strong elements are already stored in the "disallowed list"
// before this method is called.
copyDerivedWildcard();
// If this wildcard is the open content, also need to subtract all
// wildcard edges, because open content is weaker than the wildcards.
if (derived.isOpenContent(wd)) {
int[] idx = new int[1];
idx[0] = -1;
XSWildcardDecl wd1;
// Subtract all wildcard edges. Stop if the wildcard becomes empty
while (!emptyWildcard() && (wd1 = derived.nextWildcardTransition(d, dn, idx)) != null) {
if (wd1 != wd) {
subtractWildcard(wd1, true);
}
}
}
// Go through all base element transitions
indexb[0] = -1;
while ((eb = base.nextElementTransition(b, bn, indexb)) != null) {
// True: good match; False: bad match; null: no match
Boolean res = checkWERestriction();
if (res != null) {
if (!res.booleanValue()) {
return false;
}
else {
// The base element name is added to the disallow list
// in checkWERestriction();
// Add good match to the state pair list
addState();
}
}
// Also attempt to match sub-group members in base. Same process.
if (eb.getScope() == XSConstants.SCOPE_GLOBAL) {
XSElementDecl[] ebs = sgh.getSubstitutionGroup(eb, Constants.SCHEMA_VERSION_1_1);
for (int j = 0; j < ebs.length; j++) {
this.eb = ebs[j];
res = checkWERestriction();
if (res != null) {
if (!res.booleanValue()) {
return false;
}
else {
addState();
}
}
}
}
}
// Now go through all base wildcard transitions
indexb[0] = -1;
while (!emptyWildcard() && (wb = base.nextWildcardTransition(b, bn, indexb)) != null) {
// Returns whether there was any overlap that got subtracted
if (subtractWildcard(wb, false)) {
// If there was overlap (match), check "process contents"
if (wd.weakerProcessContents(wb)) {
return false;
}
// Add good match to the state pair list
addState();
}
}
// The emtire wildcard must have been matched. If there's anything left,
// it's allowed by derived but not base. Error.
if (!emptyWildcard()) {
return false;
}
return true;
}
// Base element and derived wildcard.
// True: good match; False: bad match; null: no match
private Boolean checkWERestriction() {
// Whether element name is allowed by the wildcard
if (!allowName(eb.fTargetNamespace, eb.fName)) {
return null;
}
// Skip wildcard in derived can't restrict element in base.
if (wd.fProcessContents == XSWildcardDecl.PC_SKIP) {
return Boolean.FALSE;
}
// Must be able to find a global decl. Otherwise wildcard in derived
// can't restrict element in base.
ed = getGlobalElementDecl(qname);
if (ed == null) {
return Boolean.FALSE;
}
// The global element decl must match the base element
if (ed != eb && !checkEERestriction()) {
return Boolean.FALSE;
}
// Good match. Subtract the name from the wildcard.
wDNList.add(eb.fTargetNamespace);
wDNList.add(eb.fName);
return Boolean.TRUE;
}
// Subtract the specified wildcard from the wildcard in this class.
// Returns whether the 2 wildcards had any overlap.
private boolean subtractWildcard(XSWildcardDecl wc, boolean isDerived) {
boolean changed = false;
// Because of UPA, it's not possible to add a name to the allowed list
// when subtracting a wildcard, then remove that same name when
// subtracting another wildcard, except for when the second wildcard
// is the open content. So only need to clear the allowed list
// when subtracting the open content.
// Also because open content is the last wildcard to subtract, all
// allowed names must be allowed by the base open content. If there is
// a name that's not allowed, we can return quickly, leaving this
// wildcard as non-empty, which will cause an error later.
if (!isDerived && base.isOpenContent(wc) && wANList.size() > 0) {
for (int i = 0; i < wANList.size();) {
qname.uri = (String)wANList.get(i++);
qname.localpart = (String)wANList.get(i++);
// A name allowed by derived wildcard but not by base open
// content. Quick return and detect the error later.
if (!base.allowExpandedName(wc, qname, sgh, this)) {
return false;
}
}
// All allowed names have base matches. Clear them.
wANList.clear();
changed = true;
}
// First add "disallowedNames" in "sub" to the allowed list.
// All disallowed names in the "sub" wildcard are added as allowed names
// if they are allowed by this wildcard.
int count = wc.fDisallowedNamesList == null ? 0 : wc.fDisallowedNamesList.length;
for (int i = 0; i < count; i++) {
addAN(wc.fDisallowedNamesList[i].uri, wc.fDisallowedNamesList[i].localpart);
}
// If "sub" wildcard has ##defined, and this doesn't, add all global
// element names to the allowed list, if this wildcard allows them.
if (wc.fDisallowedDefined && !wDD) {
if (globals == null) {
getGlobalElements();
}
for (int i = 0; i < globals.size();) {
String ns = (String)globals.get(i++);
String name = (String)globals.get(i++);
if (wc.allowNamespace(ns)) {
addAN(ns, name);
}
}
}
// If "sub" wildcard has ##sibling
if (wc.fDisallowedSibling) {
if (!isDerived) {
// Add all names known to the base to the allowed list
if (siblingsB == null) {
getBaseSiblings();
}
for (int i = 0; i < siblingsB.size();) {
String ns = (String)siblingsB.get(i++);
String name = (String)siblingsB.get(i++);
if (wc.allowNamespace(ns)) {
addAN(ns, name);
}
}
}
else if (!wDS){
// If "sub" is also from derived, don't need to subtract
// if this wildcard also has ##sibling. Otherwise add all
// known names in derived to the allowed list
if (siblingsD == null) {
getDerivedSiblings();
}
for (int i = 0; i < siblingsD.size();) {
String ns = (String)siblingsD.get(i++);
String name = (String)siblingsD.get(i++);
if (wc.allowNamespace(ns)) {
addAN(ns, name);
}
}
}
}
// Now deal with namespace. "sub" is any, remove all namespaces.
if (wc.getConstraintType() == XSWildcardDecl.NSCONSTRAINT_ANY) {
wType = XSWildcardDecl.NSCONSTRAINT_LIST;
wNSList.clear();
return true;
}
if (wc.getConstraintType() == XSWildcardDecl.NSCONSTRAINT_NOT) {
// both "sub" and this are "not". Only keep namespaces in "sub"'s
// "not" list but not in my "not" list.
if (wType == XSWildcardDecl.NSCONSTRAINT_NOT) {
wType = XSWildcardDecl.NSCONSTRAINT_LIST;
wNSListTemp.clear();
for (int i = 0; i < wc.fNamespaceList.length; i++) {
if (!wNSList.contains(wc.fNamespaceList[i])) {
wNSListTemp.add(wc.fNamespaceList[i]);
}
}
wNSList.clear();
wNSList.addAll(wNSListTemp);
return true;
}
// This is "list" and "sub" is "not". Only namespaces in "sub"'s
// "not" list and also in my "yes" list.
wNSListTemp.clear();
for (int i = 0; i < wc.fNamespaceList.length; i++) {
if (wNSList.contains(wc.fNamespaceList[i])) {
wNSListTemp.add(wc.fNamespaceList[i]);
}
}
// No namespace was removed.
if (wNSList.size() == wNSListTemp.size()) {
return changed;
}
// Some namespaces were removed.
wNSList.clear();
wNSList.addAll(wNSListTemp);
return true;
}
if (wType == XSWildcardDecl.NSCONSTRAINT_NOT) {
// "sub" is list, this is "not". Add "sub"'s list to my "not" list.
for (int i = 0; i < wc.fNamespaceList.length; i++) {
if (!wNSList.contains(wc.fNamespaceList[i])) {
wNSList.add(wc.fNamespaceList[i]);
changed = true;
}
}
}
else {
// Both are lists. Remove "sub"'s list from my list.
for (int i = 0; i < wc.fNamespaceList.length; i++) {
if (wNSList.remove(wc.fNamespaceList[i])) {
changed = true;
}
}
}
return changed;
}
// For each pair of matching states, if derived is final, base must be final.
private boolean checkFinalStates() {
for (int i = 0 ; i < states.size(); i++) {
StatePair sp = (StatePair)states.get(i);
sp.getStates(b, d);
if (derived.endContentModel(d) && !base.endContentModel(b)) {
return false;
}
}
return true;
}
// A pair of base/derived states.
private static class StatePair {
private final int[] states;
public StatePair(int[] b, int[] d) {
this.states = new int[b.length + d.length];
System.arraycopy(b, 0, states, 0, b.length);
System.arraycopy(d, 0, states, states.length - d.length, d.length);
}
private void set(int[] b, int[] d) {
System.arraycopy(b, 0, states, 0, b.length);
System.arraycopy(d, 0, states, states.length - d.length, d.length);
}
private void getStates(int[] b, int[] d) {
System.arraycopy(states, 0, b, 0, b.length);
System.arraycopy(states, states.length - d.length, d, 0, d.length);
}
// Equal objects must have same hash code
public int hashCode() {
int res = 0;
for (int i = 0; i < states.length; i++) {
res = res * 7 + states[i];
}
return res;
}
// it equals to another object if and only if they both have the same
// base and derived states
public boolean equals(Object o) {
if (!(o instanceof StatePair))
return false;
StatePair sp = (StatePair)o;
return Arrays.equals(states, sp.states);
}
}
// Optimization for when derived is "all", to avoid turning it into DFA
private Boolean checkAllDerived() {
// Derived is "all"; base is empty
if (base instanceof XSEmptyCM) {
Boolean ret = checkAllEmpty();
if (ret != null) {
return ret;
}
// Base must be an empty with open content. It's turned into an
// all with open content. Fall through.
}
if (base instanceof XS11AllCM) {
// Both are "all"
allb = (XS11AllCM)base;
// True: valid; False; invalid: null: check further
Boolean ret = checkAllAll();
// Even thought checkAllAll() didn't give a definitive answer, it
// may have simplified the content models. Use the new ones.
if (ret == null) {
base = allb;
derived = alld;
// Treating the all derived as DFA. Check whether that'll
// consume too much memory.
cmb.testOccurrences(alld.calOccurs());
}
return ret;
}
else { // if (base instanceof XSDFACM)
// Derived is "all"; base is DFA
dfab = (XSDFACM)base;
// True: valid; False; invalid: null: check further
Boolean ret = checkAllDFA();
// Even thought checkAllDFA() didn't give a definitive answer, it
// may have simplified the content models. Use the new ones.
if (ret == null) {
base = dfab;
derived = alld;
// Treating the all derived as DFA. Check whether that'll
// consume too much memory.
cmb.testOccurrences(alld.calOccurs());
}
return ret;
}
}
private Boolean checkAllEmpty() {
// If base (empty) has an open content, turn it into an "all".
int[] idx = new int[]{-1};
if (base.nextWildcardTransition(b, bn, idx) != null) {
base = new XS11AllCM(false, 0, null, ((XSEmptyCM)base).getOpenContent());
return null;
}
// Base allows nothing. Derived must be empty too.
return Boolean.valueOf(derived.nextElementTransition(d, dn, idx) == null &&
derived.nextWildcardTransition(d, dn, idx) == null);
}
// Optimize for the common case where base has elements and derived has
// same-named elements. Try to reduce occurrence from derive, or remove
// the elements entirely. Don't try too hard for wildcards.
private Boolean checkAllAll() {
if (allb.getOpenContent() != null &&
allb.getOpenContent().fMode == XSOpenContentDecl.MODE_SUFFIX &&
alld.getOpenContent() != null &&
alld.getOpenContent().fMode == XSOpenContentDecl.MODE_INTERLEAVE) {
// Base (e)+suffix, derived (e)+interleave. If we remove "e", we
// may think the derivation is OK. Don't optimize. Fall back.
return null;
}
if (siblingsD == null) {
getDerivedSiblings();
}
// TODO
// List excludedUnboundedElementsCopy = new ArrayList();
// indexd[0] = -1;
// while ((ed = derived.nextElementTransition(d, dn, indexd)) != null) {
// if (alld.isUnbounded(indexd[0])) {
// excludedUnboundedElementsCopy.add(ed.fTargetNamespace);
// excludedUnboundedElementsCopy.add(ed.fName);
// }
// if (ed.getScope() == XSConstants.SCOPE_GLOBAL) {
// XSElementDecl[] eds = sgh.getSubstitutionGroup(ed, Constants.SCHEMA_VERSION_1_1);
// for (int i = 0; i < eds.length; i++) {
// if (alld.isUnbounded(indexd[0])) {
// excludedUnboundedElementsCopy.add(ed.fTargetNamespace);
// excludedUnboundedElementsCopy.add(ed.fName);
// }
// }
// }
// }
if (alld.hasOptionalContent()) {
if (!checkOptionalContent()) {
return Boolean.FALSE;
}
}
else if (allb.hasOptionalContent()) {
// base: (a&)? derived: (a?&) should be OK.
// Not easy to detect; fall back
return null;
}
// We've dealt with open content and optional content mismatches.
// Now we can start reducing element occurrences. Ideally to 0.
// The following scenario is safe to be reduced. Not sure about others.
// 1. A base element B matches one or more derived elements
// 2. B doesn't match any of the derived wildcards
// 3. B matches the entirety of the derived elements. As a consequence,
// the derived elements don't match any other base element.
// 4.1 B matches exactly one derived element, or
// 4.2 B has big enough maxOccurs for all derived elements.
// Then we can remove the base element and all the derived ones.
// #2 is so that we don't need to worry about
// base: ((ns1:a|ns2:b) & ns2:*) derived (ns1:a & ns2:*)
// #3 is so that we don't need to worry about
// base: ((a|b) & c) derived (a & (b|c))
// #4 is so that we don't need to worry about
// base: ((a|b) & *) derived (a & b & *)
// but this is OK: (a & *) derived (a{2} & *)
// We don't need to worry about if derived elements also match base
// wildcard, because the wildcard is weaker and the derived element
// always matches the base element (which has sufficient maxOccurs).
// TODO: we may be able to do more, but element-element should be the
// common case. May want to consider wildcard-element and
// wildcard-wildcard, but need to take into account elements that may
// have made the wildcards weaker.
// e.g. reduce wildcards? open content?
// e.g. base (wc*&) derived (e1&e2...) optimize
// For each derived element, -1: initial; -2: no matching base element;
// >= 0 index of matching base element
int[] matchD = derived.startContentModel();
// For each base element: 0: not used; < 0: can't be used;
// > 0: number of derived elements that match this base element
int[] usedB = base.startContentModel();
indexd[0] = -1;
while ((ed = derived.nextElementTransition(d, dn, indexd)) != null) {
// For each derived element, try to find matching base elements.
// Checking #1 and #3 above.
matchD[indexd[0]] = -1;
matchedHead = false;
if (!matchEE(matchD, usedB)) {
// Bad match, return the error immediately
return Boolean.FALSE;
}
if (!matchedHead) {
if (ed.getScope() == XSConstants.SCOPE_GLOBAL) {
XSElementDecl[] eds = sgh.getSubstitutionGroup(ed, Constants.SCHEMA_VERSION_1_1);
for (int i = 0; i < eds.length; i++) {
ed = eds[i];
if (!matchEE(matchD, usedB)) {
// Bad match, return the error immediately
return Boolean.FALSE;
}
}
}
}
}
// Match derived wildcards with base elements, to make sure #2 above
// is satisfied.
// The wildcards are weaker than elements. Remove element names.
wDNList.clear();
wDNList.addAll(siblingsD);
indexd[0] = -1;
while ((wd = derived.nextWildcardTransition(d, dn, indexd)) != null) {
if (!matchWE(usedB)) {
// Bad match, return the error immediately
return Boolean.FALSE;
}
}
// Now gather maxOccurs from derived to check for #4
// For each base element, take the sum of all matching derived elements.
int[] min = base.startContentModel(), max = base.startContentModel();
indexd[0] = -1;
while ((ed = derived.nextElementTransition(d, dn, indexd)) != null) {
indexb[0] = matchD[indexd[0]];
if (indexb[0] >= 0) {
alld.collectOccurs(min, max, indexb[0], indexd[0]);
}
}
// About to reduce min/maxOccurs. Make a copy of the content models.
allb = allb.copy();
alld = alld.copy();
// Check whether the base can accommodate the total of the derived.
if (!allb.removeAsBase(min, max, usedB)) {
// If the base has more minOccurs than sum of derived, then
// bad derivation. The minOccurs can't be satisfied by other
// components (i.e wildcards), because the wildcards can take
// names other than that of the base element.
return Boolean.FALSE;
}
// For those that pass #4, remove corresponding derived elements.
alld.removeAsDerived(max, usedB, matchD);
// Whatever is left will be handled by the default DFA path.
return null;
}
private boolean checkOptionalContent() {
// Called when derived has optional content (a & b)?, so allows empty.
// Need to make sure that
// 1. Base also allowed the empty sequence
// 2. If derived allows the first element to match the open content,
// leaving the "all" content as empty, then base doesn't match that
// element using an entry in the "all" content and require other
// things in the "all" content to also be present.
// Check #1: Make sure base also allows empty.
int totalMin = allb.totalMin();
if (!allb.hasOptionalContent() && totalMin != 0) {
return false;
}
// If derived doesn't have an open content, don't need to check #2.
XSOpenContentDecl oc = alld.getOpenContent();
wd = oc == null ? null : oc.fWildcard;
if (wd == null) {
return true;
}
// Calculate the effective open content for first element, by
// subtracting all elements/wildcards from the "all" content.
wDNList.clear();
wDNList.addAll(siblingsD);
copyDerivedWildcard();
int[] idx = new int[1];
idx[0] = -1;
XSWildcardDecl wd1;
while (!emptyWildcard() && (wd1 = derived.nextWildcardTransition(d, dn, idx)) != null) {
if (wd1 != wd) {
subtractWildcard(wd1, true);
}
}
// If the "first element" open content is empty, don't need #2.
if (emptyWildcard()) {
return true;
}
// Now "first element" open content is not empty, need to check whether
// it matches any element/wildcard in base "all" content. If it does,
// then the matching component must not have min>1 and all the other
// components must have min=0, to not impose more "required" elements.
indexb[0] = -1;
while ((eb = base.nextElementTransition(b, bn, indexb)) != null) {
int min = allb.min(indexb[0]);
if (allowName(eb.fTargetNamespace, eb.fName)) {
// This element matches the derived open content. Make sure
// no additional elements are required.
if (min > 1 || min < totalMin) {
return false;
}
// No need to check sub-group, as they have same "min".
continue;
}
if (eb.getScope() == XSConstants.SCOPE_GLOBAL) {
XSElementDecl[] ebs = sgh.getSubstitutionGroup(eb, Constants.SCHEMA_VERSION_1_1);
for (int j = 0; j < ebs.length; j++) {
this.eb = ebs[j];
if (allowName(eb.fTargetNamespace, eb.fName)) {
// This element matches the derived open content. Make
// sure no additional elements are required.
if (min > 1 || min < totalMin) {
return false;
}
break;
}
}
}
}
// Now match "first element" open content with base wildcards.
indexb[0] = -1;
while ((wb = base.nextWildcardTransition(b, bn, indexb)) != null) {
if (!base.isOpenContent(wb) && overlap()) {
int min = allb.min(indexb[0]);
// This wildcards matches the derived open content. Make
// sure no additional elements are required.
if (min > 1 || min < totalMin) {
return false;
}
}
}
// Now we are certain that when the derived optional "all" content
// is not used, the base do not have any required element.
return true;
}
private boolean overlap() {
// Check whether the derived open content wildcard overlaps with the
// base wildcard "wb".
// Overlap if names in the allowed list are allowed by "wb".
for (int i = 0; i < wANList.size();) {
qname.uri = (String)wANList.get(i++);
qname.localpart = (String)wANList.get(i++);
if (base.allowExpandedName(wb, qname, sgh, this)) {
return true;
}
}
// Overlap if namespaces overlap.
// Both are any/not. Always overlap.
if (wType == XSWildcardDecl.NSCONSTRAINT_ANY ||
wb.fType == XSWildcardDecl.NSCONSTRAINT_ANY ||
wType == XSWildcardDecl.NSCONSTRAINT_NOT &&
wb.fType == XSWildcardDecl.NSCONSTRAINT_NOT) {
return true;
}
// Both are lists. Overlap if the namespace lists overlap.
if (wType == XSWildcardDecl.NSCONSTRAINT_LIST &&
wb.fType == XSWildcardDecl.NSCONSTRAINT_LIST) {
for (int i = 0; i < wb.fNamespaceList.length; i++) {
if (wNSList.contains(wb.fNamespaceList[i])) {
return true;
}
}
return false;
}
// Derived is "not" and "wb" is list. Overlap if a namespace in "wb"
// list is not excluded from derived.
if (wType == XSWildcardDecl.NSCONSTRAINT_NOT) {
for (int i = 0; i < wb.fNamespaceList.length; i++) {
if (!wNSList.contains(wb.fNamespaceList[i])) {
return true;
}
}
return false;
}
// Derived is list and "wb" is "not". Overlap if a namespace in derived
// list is not excluded from "wb".
for (int i = 0; i < wNSList.size(); i++) {
String ns = (String)wNSList.get(i);
int j = 0;
for (; j < wb.fNamespaceList.length; j++) {
if (ns == null && wb.fNamespaceList[j] == null ||
ns != null && ns.equals(wb.fNamespaceList[j])) {
break;
}
}
// A namespace in "derived" is not excluded from "wb". Overlap.
if (j == wb.fNamespaceList.length) {
return true;
}
}
return false;
}
// Similar to findElementInBase, but need to handle the match/used arrays.
private boolean matchEE(int[] matchD, int[] usedB) {
// Look for a base element to match "ed"
int id = indexd[0];
indexb[0] = -1;
while ((eb = base.nextElementTransition(b, bn, indexb)) != null) {
int ib = indexb[0];
if (eb.getName() == ed.getName() && eb.getNamespace() == ed.getNamespace()) {
// If derived had a match before, e.g. its sub-group member
// matched an element before, and the head now also matches
// an element. Then make sure the 2 base element are the same,
// otherwise we break #3: same derived different base.
if (matchD[id] != -1 && matchD[id] != ib) {
// Mark both base elements as "not usable".
usedB[matchD[id]] = -1;
usedB[ib] = -1;
// This derived element isn't usable either. Return.
// But this is not an error, so return true.
return true;
}
// Need to make sure the base is usable.
if (usedB[ib] < 0) {
// Remember that the derived element had a match.
// In case this element matches a different base,
// then we know we need to mark that other base
// as not usable.
matchD[id] = ib;
return true;
}
// Record the match.
if (matchD[id] == -1) {
matchD[id] = ib;
// Remember how many matches the base element has.
// Only do so if this is the first match, so that we only
// count each base element once.
usedB[ib]++;
}
// Head match. No need to check sub-group members.
matchedHead = eb == ed;
// Must satisfy other element-element restriction requirements.
return checkEERestriction();
}
else {
// if the name doesn't match, try its sub group elements
XSElementDecl[] ebs = sgh.getSubstitutionGroup(eb, Constants.SCHEMA_VERSION_1_1);
for (int i = 0; i < ebs.length; i++) {
// found a name match, check properties of the decls
if (ebs[i].getName() == ed.getName() &&
ebs[i].getNamespace() == ed.getNamespace()) {
if (matchD[id] != -1 && matchD[id] != ib) {
// #3: Same derived matches multiple base.
// Mark both base elements as "not usable".
if (matchD[id] >= 0) {
usedB[matchD[id]] = -1;
}
usedB[ib] = -1;
// This derived element isn't usable either. Return.
// But this is not an error, so return true.
return true;
}
// Need to make sure the base is usable.
if (usedB[ib] < 0) {
// Remember that the derived element had a match.
// In case this element matches a different base,
// then we know we need to mark that other base
// as not usable.
matchD[id] = ib;
return true;
}
// Record the match. Also need to make sure the base is usable.
if (matchD[id] == -1) {
matchD[id] = ib;
// Remember how many matches the base element has.
// Only do so if this is the first match, so that we only
// count each base element once.
usedB[ib]++;
}
eb = ebs[i];
return checkEERestriction();
}
}
}
}
// Derived element has no match in base.
if (matchD[id] >= 0) {
// If this element had a match, then #3 is not satisfied.
// Mark the base as not usable.
usedB[matchD[id]] = -1;
}
// Remember the fact that this element had a no-match. If we find a
// match for it (its sub-group member) later, need to mark the matching
// base as not usable.
matchD[id] = -2;
return true;
}
// Similar to matchWildcardInBase, but only deal with base element,
// and need to handle the used array.
private boolean matchWE(int[] usedB) {
indexb[0] = -1;
while ((eb = base.nextElementTransition(b, bn, indexb)) != null) {
int ib = indexb[0];
// Only interested in base elements that had derived matches.
// Other elements will be handled when we fall back to DFA.
if (usedB[ib] <= 0) {
continue;
}
// True: good match; False: bad match; null: no match
Boolean res = checkWERestriction();
if (res != null) {
if (!res.booleanValue()) {
return false;
}
else {
// Same base element matches both element and wildcard
// in derived. Fallback to DFA.
usedB[ib] = -1;
return true;
}
}
// No match. Look at sub-group
if (eb.getScope() == XSConstants.SCOPE_GLOBAL) {
XSElementDecl[] ebs = sgh.getSubstitutionGroup(eb, Constants.SCHEMA_VERSION_1_1);
for (int i = 0; i < ebs.length; i++) {
this.eb = ebs[i];
res = checkWERestriction();
if (res != null) {
if (!res.booleanValue()) {
return false;
}
else {
// Same base element matches both element and wildcard
// in derived. Fallback to DFA.
usedB[ib] = -1;
return true;
}
}
}
}
}
return true;
}
private Boolean checkAllDFA() {
// Don't optimize for this case yet. It's a strange derivation to
// restrict a sequence/choice content model to an "all".
return null;
}
}
