/*
* 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.identity;
import org.apache.xerces.impl.xpath.XPathException;
import org.apache.xerces.util.SymbolTable;
import org.apache.xerces.util.XMLChar;
import org.apache.xerces.xni.NamespaceContext;
import org.apache.xerces.xni.QName;
import org.apache.xerces.xni.XMLAttributes;
import org.apache.xerces.xs.ShortList;
import org.apache.xerces.xs.XSTypeDefinition;
/**
* Schema identity constraint selector.
*
* @xerces.internal
*
* @author Andy Clark, IBM
* @version $Id: Selector.java 572110 2007-09-02 19:04:44Z mrglavas $
*/
public class Selector {
//
// Data
//
/** XPath. */
protected final Selector.XPath fXPath;
/** Identity constraint. */
protected final IdentityConstraint fIdentityConstraint;
// the Identity constraint we're the matcher for. Only
// used for selectors!
protected IdentityConstraint fIDConstraint;
//
// Constructors
//
/** Constructs a selector. */
public Selector(Selector.XPath xpath,
IdentityConstraint identityConstraint) {
fXPath = xpath;
fIdentityConstraint = identityConstraint;
} // <init>(Selector.XPath,IdentityConstraint)
//
// Public methods
//
/** Returns the selector XPath. */
public org.apache.xerces.impl.xpath.XPath getXPath() {
return fXPath;
} // getXPath():org.apache.xerces.v1.schema.identity.XPath
/** Returns the identity constraint. */
public IdentityConstraint getIDConstraint() {
return fIdentityConstraint;
} // getIDConstraint():IdentityConstraint
// factory method
/** Creates a selector matcher.
* @param activator The activator for this selector's fields.
* @param initialDepth The depth in the document at which this matcher began its life;
* used in correctly handling recursive elements.
*/
public XPathMatcher createMatcher(FieldActivator activator, int initialDepth) {
return new Selector.Matcher(fXPath, activator, initialDepth);
} // createMatcher(FieldActivator):XPathMatcher
//
// Object methods
//
/** Returns a string representation of this object. */
public String toString() {
return fXPath.toString();
} // toString():String
//
// Classes
//
/**
* Schema identity constraint selector XPath expression.
*
* @author Andy Clark, IBM
* @version $Id: Selector.java 572110 2007-09-02 19:04:44Z mrglavas $
*/
public static class XPath
extends org.apache.xerces.impl.xpath.XPath {
//
// Constructors
//
/** Constructs a selector XPath expression. */
public XPath(String xpath, SymbolTable symbolTable,
NamespaceContext context) throws XPathException {
super(normalize(xpath), symbolTable, context);
// verify that an attribute is not selected
for (int i=0;i<fLocationPaths.length;i++) {
org.apache.xerces.impl.xpath.XPath.Axis axis =
fLocationPaths[i].steps[fLocationPaths[i].steps.length-1].axis;
if (axis.type == XPath.Axis.ATTRIBUTE) {
throw new XPathException("c-selector-xpath");
}
}
} // <init>(String,SymbolTable,NamespacesScope)
private static String normalize(String xpath) {
// NOTE: We have to prefix the selector XPath with "./" in
// order to handle selectors such as "." that select
// the element container because the fields could be
// relative to that element. -Ac
// Unless xpath starts with a descendant node -Achille Fokoue
// ... or a '.' or a '/' - NG
// And we also need to prefix exprs to the right of | with ./ - NG
StringBuffer modifiedXPath = new StringBuffer(xpath.length()+5);
int unionIndex = -1;
do {
if(!(XMLChar.trim(xpath).startsWith("/") || XMLChar.trim(xpath).startsWith("."))) {
modifiedXPath.append("./");
}
unionIndex = xpath.indexOf('|');
if(unionIndex == -1) {
modifiedXPath.append(xpath);
break;
}
modifiedXPath.append(xpath.substring(0,unionIndex+1));
xpath = xpath.substring(unionIndex+1, xpath.length());
} while(true);
return modifiedXPath.toString();
}
} // class Selector.XPath
/**
* Selector matcher.
*
* @author Andy Clark, IBM
*/
public class Matcher
extends XPathMatcher {
//
// Data
//
/** Field activator. */
protected final FieldActivator fFieldActivator;
/** Initial depth in the document at which this matcher was created. */
protected final int fInitialDepth;
/** Element depth. */
protected int fElementDepth;
/** Depth at match. */
protected int fMatchedDepth;
//
// Constructors
//
/** Constructs a selector matcher. */
public Matcher(Selector.XPath xpath, FieldActivator activator,
int initialDepth) {
super(xpath);
fFieldActivator = activator;
fInitialDepth = initialDepth;
} // <init>(Selector.XPath,FieldActivator)
//
// XMLDocumentFragmentHandler methods
//
public void startDocumentFragment(){
super.startDocumentFragment();
fElementDepth = 0;
fMatchedDepth = -1;
} // startDocumentFragment()
/**
* The start of an element. If the document specifies the start element
* by using an empty tag, then the startElement method will immediately
* be followed by the endElement method, with no intervening methods.
*
* @param element The name of the element.
* @param attributes The element attributes.
*
*/
public void startElement(QName element, XMLAttributes attributes) {
super.startElement(element, attributes);
fElementDepth++;
// activate the fields, if selector is matched
//int matched = isMatched();
if (isMatched()) {
/* (fMatchedDepth == -1 && ((matched & MATCHED) == MATCHED)) ||
((matched & MATCHED_DESCENDANT) == MATCHED_DESCENDANT)) { */
fMatchedDepth = fElementDepth;
fFieldActivator.startValueScopeFor(fIdentityConstraint, fInitialDepth);
int count = fIdentityConstraint.getFieldCount();
for (int i = 0; i < count; i++) {
Field field = fIdentityConstraint.getFieldAt(i);
XPathMatcher matcher = fFieldActivator.activateField(field, fInitialDepth);
matcher.startElement(element, attributes);
}
}
} // startElement(QName,XMLAttrList,int)
public void endElement(QName element, XSTypeDefinition type, boolean nillable, Object actualValue, short valueType, ShortList itemValueType) {
super.endElement(element, type, nillable, actualValue, valueType, itemValueType);
if (fElementDepth-- == fMatchedDepth) {
fMatchedDepth = -1;
fFieldActivator.endValueScopeFor(fIdentityConstraint, fInitialDepth);
}
}
/** Returns the identity constraint. */
public IdentityConstraint getIdentityConstraint() {
return fIdentityConstraint;
} // getIdentityConstraint():IdentityConstraint
/** get the initial depth at which this selector matched. */
public int getInitialDepth() {
return fInitialDepth;
} // getInitialDepth(): int
} // class Matcher
} // class Selector
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