com.sun.xml.xsom.SCD Maven / Gradle / Ivy
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
* If applicable, add the following below the License Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
* "Portions Copyright [year] [name of copyright owner]"
*
* Contributor(s):
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*/
package com.sun.xml.xsom;
import com.sun.xml.xsom.impl.scd.Iterators;
import com.sun.xml.xsom.impl.scd.ParseException;
import com.sun.xml.xsom.impl.scd.SCDImpl;
import com.sun.xml.xsom.impl.scd.SCDParser;
import com.sun.xml.xsom.impl.scd.Step;
import com.sun.xml.xsom.impl.scd.TokenMgrError;
import com.sun.xml.xsom.util.DeferedCollection;
import javax.xml.namespace.NamespaceContext;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
/**
* Schema Component Designator (SCD).
*
*
* SCD for schema is what XPath is for XML. SCD allows you to select a schema component(s)
* from a schema component(s).
*
*
* See XML Schema: Component Designators.
* This implementation is based on 03/29/2005 working draft.
*
* @author Kohsuke Kawaguchi
*/
public abstract class SCD {
/**
* Parses the string representation of SCD.
*
*
* This method involves parsing the path expression and preparing the in-memory
* structure, so this is useful when you plan to use the same SCD against
* different context node multiple times.
*
*
* If you want to evaluate SCD just once, use {@link XSComponent#select} methods.
*
* @param path
* the string representation of SCD, such as "/foo/bar".
* @param nsContext
* Its {@link NamespaceContext#getNamespaceURI(String)} is used
* to resolve prefixes in the SCD to the namespace URI.
*/
public static SCD create(String path, NamespaceContext nsContext) throws java.text.ParseException {
try {
SCDParser p = new SCDParser(path,nsContext);
List list = p.RelativeSchemaComponentPath();
return new SCDImpl(path,list.toArray(new Step[list.size()]));
} catch (TokenMgrError e) {
throw setCause(new java.text.ParseException(e.getMessage(), -1 ),e);
} catch (ParseException e) {
throw setCause(new java.text.ParseException(e.getMessage(), e.currentToken.beginColumn ),e);
}
}
private static java.text.ParseException setCause(java.text.ParseException e, Throwable x) {
e.initCause(x);
return e;
}
/**
* Evaluates the SCD against the given context node and
* returns the matched nodes.
*
* @return
* could be empty but never be null.
*/
public final Collection select(XSComponent contextNode) {
return new DeferedCollection(select(Iterators.singleton(contextNode)));
}
/**
* Evaluates the SCD against the whole schema and
* returns the matched nodes.
*
*
* This method is here because {@link XSSchemaSet}
* doesn't implement {@link XSComponent}.
*
* @return
* could be empty but never be null.
*/
public final Collection select(XSSchemaSet contextNode) {
return select(contextNode.getSchemas());
}
/**
* Evaluates the SCD against the given context node and
* returns the matched node.
*
* @return
* null if the SCD didn't match anything. If the SCD matched more than one node,
* the first one will be returned.
*/
public final XSComponent selectSingle(XSComponent contextNode) {
Iterator r = select(Iterators.singleton(contextNode));
if(r.hasNext()) return r.next();
return null;
}
/**
* Evaluates the SCD against the whole schema set and
* returns the matched node.
*
* @return
* null if the SCD didn't match anything. If the SCD matched more than one node,
* the first one will be returned.
*/
public final XSComponent selectSingle(XSSchemaSet contextNode) {
Iterator r = select(contextNode.iterateSchema());
if(r.hasNext()) return r.next();
return null;
}
/**
* Evaluates the SCD against the given set of context nodes and
* returns the matched nodes.
*
* @param contextNodes
* {@link XSComponent}s that represent the context node against
* which {@link SCD} is evaluated.
*
* @return
* could be empty but never be null.
*/
public abstract Iterator select(Iterator contextNodes);
/**
* Evaluates the SCD against the given set of context nodes and
* returns the matched nodes.
*
* @param contextNodes
* {@link XSComponent}s that represent the context node against
* which {@link SCD} is evaluated.
*
* @return
* could be empty but never be null.
*/
public final Collection select(Collection contextNodes) {
return new DeferedCollection(select(contextNodes.iterator()));
}
/**
* Returns the textual SCD representation as given to {@link SCD#create(String, NamespaceContext)}.
*/
public abstract String toString();
}