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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.Vector;
import org.apache.xerces.impl.Constants;
import org.apache.xerces.impl.xs.SubstitutionGroupHandler;
import org.apache.xerces.impl.xs.XMLSchemaException;
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.xni.QName;
/**
* XSAllCM implements XSCMValidator and handles <all>.
*
* @xerces.internal
*
* @author Pavani Mukthipudi, Sun Microsystems Inc.
* @version $Id: XSAllCM.java 1155073 2011-08-08 20:02:50Z knoaman $
*/
public class XSAllCM implements XSCMValidator {
//
// Constants
//
// start the content model: did not see any children
private static final short STATE_START = 0;
private static final short STATE_VALID = 1;
private static final short STATE_CHILD = 1;
//
// Data
//
private final XSElementDecl fAllElements[];
private final boolean fIsOptionalElement[];
private final boolean fHasOptionalContent;
private int fNumElements = 0;
private final short fSchemaVersion;
//
// Constructors
//
public XSAllCM (boolean hasOptionalContent, int size, short schemaVersion) {
fHasOptionalContent = hasOptionalContent;
fAllElements = new XSElementDecl[size];
fIsOptionalElement = new boolean[size];
fSchemaVersion = schemaVersion;
}
public void addElement (XSElementDecl element, boolean isOptional) {
fAllElements[fNumElements] = element;
fIsOptionalElement[fNumElements] = isOptional;
fNumElements++;
}
//
// XSCMValidator methods
//
/**
* This methods to be called on entering a first element whose type
* has this content model. It will return the initial state of the
* content model
*
* @return Start state of the content model
*/
public int[] startContentModel() {
int[] state = new int[fNumElements + 1];
for (int i = 0; i <= fNumElements; i++) {
state[i] = STATE_START;
}
return state;
}
// convinient method: when error occurs, to find a matching decl
// from the candidate elements.
Object findMatchingDecl(QName elementName, SubstitutionGroupHandler subGroupHandler) {
Object matchingDecl = null;
for (int i = 0; i < fNumElements; i++) {
matchingDecl = subGroupHandler.getMatchingElemDecl(elementName, fAllElements[i], fSchemaVersion/*Constants.SCHEMA_VERSION_1_0*/);
if (matchingDecl != null)
break;
}
return matchingDecl;
}
/**
* The method corresponds to one transition in the content model.
*
* @param elementName
* @param currentState Current state
* @return an element decl object
*/
public Object oneTransition (QName elementName, int[] currentState, SubstitutionGroupHandler subGroupHandler, XSElementDeclHelper eDeclHelper) {
// error state
if (currentState[0] < 0) {
currentState[0] = XSCMValidator.SUBSEQUENT_ERROR;
return findMatchingDecl(elementName, subGroupHandler);
}
// seen child
currentState[0] = STATE_CHILD;
Object matchingDecl = null;
for (int i = 0; i < fNumElements; i++) {
// we only try to look for a matching decl if we have not seen
// this element yet.
if (currentState[i+1] != STATE_START)
continue;
matchingDecl = subGroupHandler.getMatchingElemDecl(elementName, fAllElements[i], fSchemaVersion/*Constants.SCHEMA_VERSION_1_0*/);
if (matchingDecl != null) {
// found the decl, mark this element as "seen".
currentState[i+1] = STATE_VALID;
return matchingDecl;
}
}
// couldn't find the decl, change to error state.
currentState[0] = XSCMValidator.FIRST_ERROR;
return findMatchingDecl(elementName, subGroupHandler);
}
/**
* The method indicates the end of list of children
*
* @param currentState Current state of the content model
* @return true if the last state was a valid final state
*/
public boolean endContentModel (int[] currentState) {
int state = currentState[0];
if (state == XSCMValidator.FIRST_ERROR || state == XSCMValidator.SUBSEQUENT_ERROR) {
return false;
}
// If has minOccurs of zero and there are
// no children to validate, it is trivially valid
if (fHasOptionalContent && state == STATE_START) {
return true;
}
for (int i = 0; i < fNumElements; i++) {
// if one element is required, but not present, then error
if (!fIsOptionalElement[i] && currentState[i+1] == STATE_START)
return false;
}
return true;
}
/**
* check whether this content violates UPA constraint.
*
* @param subGroupHandler the substitution group handler
* @param xsConstraints the XML Schema Constraint checker
* @return true if this content model contains other or list wildcard
*/
public boolean checkUniqueParticleAttribution(SubstitutionGroupHandler subGroupHandler, XSConstraints xsConstraints) throws XMLSchemaException {
// check whether there is conflict between any two leaves
for (int i = 0; i < fNumElements; i++) {
for (int j = i+1; j < fNumElements; j++) {
if (xsConstraints.overlapUPA(fAllElements[i], fAllElements[j], subGroupHandler)) {
// REVISIT: do we want to report all errors? or just one?
throw new XMLSchemaException("cos-nonambig", new Object[]{fAllElements[i].toString(),
fAllElements[j].toString()});
}
}
}
return false;
}
/**
* Check which elements are valid to appear at this point. This method also
* works if the state is in error, in which case it returns what should
* have been seen.
*
* @param state the current state
* @return a Vector whose entries are instances of
* either XSWildcardDecl or XSElementDecl.
*/
public Vector whatCanGoHere(int[] state) {
Vector ret = new Vector();
for (int i = 0; i < fNumElements; i++) {
// we only try to look for a matching decl if we have not seen
// this element yet.
if (state[i+1] == STATE_START)
ret.addElement(fAllElements[i]);
}
return ret;
}
public int [] occurenceInfo(int[] state) {
return null;
}
public String getTermName(int termId) {
return null;
}
public boolean isCompactedForUPA() {
return false;
}
public XSElementDecl findMatchingElemDecl(QName elementName, SubstitutionGroupHandler subGroupHandler) {
for (int i = 1; i < fNumElements; i++) {
final XSElementDecl matchingDecl = subGroupHandler.getMatchingElemDecl(elementName, fAllElements[i], Constants.SCHEMA_VERSION_1_0);
if (matchingDecl != null) {
return matchingDecl;
}
}
return null;
}
} // class XSAllCM
