/*
* 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.dtd.models;
import org.apache.xerces.xni.QName;
import org.apache.xerces.impl.dtd.XMLContentSpec;
/**
* MixedContentModel is a derivative of the abstract content model base
* class that handles the special case of mixed model elements. If an element
* is mixed model, it has PCDATA as its first possible content, followed
* by an alternation of the possible children. The children cannot have any
* numeration or order, so it must look like this:
* <pre>
* <!ELEMENT Foo ((#PCDATA|a|b|c|)*)>
* </pre>
* So, all we have to do is to keep an array of the possible children and
* validate by just looking up each child being validated by looking it up
* in the list.
*
* @xerces.internal
*
* @version $Id: MixedContentModel.java 572057 2007-09-02 18:03:20Z mrglavas $
*/
public class MixedContentModel
implements ContentModelValidator {
//
// Data
//
/** The count of possible children that we have to deal with. */
private final int fCount;
/** The list of possible children that we have to accept. */
private final QName fChildren[];
/** The type of the children to support ANY. */
private final int fChildrenType[];
/* this is the EquivClassComparator object */
//private EquivClassComparator comparator = null;
/**
* True if mixed content model is ordered. DTD mixed content models
* are <em>always</em> unordered.
*/
private final boolean fOrdered;
//
// Constructors
//
/**
* Constructs a mixed content model.
*
* @param children The list of allowed children.
* @param type The list of the types of the children.
* @param offset The start offset position in the children.
* @param length The child count.
* @param ordered True if content must be ordered.
*/
public MixedContentModel(QName[] children, int[] type, int offset, int length , boolean ordered) {
// Make our own copy now, which is exactly the right size
fCount = length;
fChildren = new QName[fCount];
fChildrenType = new int[fCount];
for (int i = 0; i < fCount; i++) {
fChildren[i] = new QName(children[offset + i]);
fChildrenType[i] = type[offset + i];
}
fOrdered = ordered;
}
//
// ContentModelValidator methods
//
/**
* Check that the specified content is valid according to this
* content model. This method can also be called to do 'what if'
* testing of content models just to see if they would be valid.
* <p>
* A value of -1 in the children array indicates a PCDATA node. All other
* indexes will be positive and represent child elements. The count can be
* zero, since some elements have the EMPTY content model and that must be
* confirmed.
*
* @param children The children of this element. Each integer is an index within
* the <code>StringPool</code> of the child element name. An index
* of -1 is used to indicate an occurrence of non-whitespace character
* data.
* @param offset Offset into the array where the children starts.
* @param length The number of entries in the <code>children</code> array.
*
* @return The value -1 if fully valid, else the 0 based index of the child
* that first failed. If the value returned is equal to the number
* of children, then the specified children are valid but additional
* content is required to reach a valid ending state.
*
*/
public int validate(QName[] children, int offset, int length) {
// must match order
if (fOrdered) {
int inIndex = 0;
for (int outIndex = 0; outIndex < length; outIndex++) {
// ignore mixed text
final QName curChild = children[offset + outIndex];
if (curChild.localpart == null) {
continue;
}
// element must match
int type = fChildrenType[inIndex];
if (type == XMLContentSpec.CONTENTSPECNODE_LEAF) {
if (fChildren[inIndex].rawname != children[offset + outIndex].rawname) {
return outIndex;
}
}
else if (type == XMLContentSpec.CONTENTSPECNODE_ANY) {
String uri = fChildren[inIndex].uri;
if (uri != null && uri != children[outIndex].uri) {
return outIndex;
}
}
else if (type == XMLContentSpec.CONTENTSPECNODE_ANY_LOCAL) {
if (children[outIndex].uri != null) {
return outIndex;
}
}
else if (type == XMLContentSpec.CONTENTSPECNODE_ANY_OTHER) {
if (fChildren[inIndex].uri == children[outIndex].uri) {
return outIndex;
}
}
// advance index
inIndex++;
}
}
// can appear in any order
else {
for (int outIndex = 0; outIndex < length; outIndex++)
{
// Get the current child out of the source index
final QName curChild = children[offset + outIndex];
// If its PCDATA, then we just accept that
if (curChild.localpart == null)
continue;
// And try to find it in our list
int inIndex = 0;
for (; inIndex < fCount; inIndex++)
{
int type = fChildrenType[inIndex];
if (type == XMLContentSpec.CONTENTSPECNODE_LEAF) {
if (curChild.rawname == fChildren[inIndex].rawname) {
break;
}
}
else if (type == XMLContentSpec.CONTENTSPECNODE_ANY) {
String uri = fChildren[inIndex].uri;
if (uri == null || uri == children[outIndex].uri) {
break;
}
}
else if (type == XMLContentSpec.CONTENTSPECNODE_ANY_LOCAL) {
if (children[outIndex].uri == null) {
break;
}
}
else if (type == XMLContentSpec.CONTENTSPECNODE_ANY_OTHER) {
if (fChildren[inIndex].uri != children[outIndex].uri) {
break;
}
}
// REVISIT: What about checking for multiple ANY matches?
// The content model ambiguity *could* be checked
// by the caller before constructing the mixed
// content model.
}
// We did not find this one, so the validation failed
if (inIndex == fCount)
return outIndex;
}
}
// Everything seems to be in order, so return success
return -1;
} // validate
} // class MixedContentModel
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