| /******************************************************************************* |
| * Copyright (c) 2005, 2010 Andrea Bittau, University College London, and others |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * Andrea Bittau - initial API and implementation from the PsychoPath XPath 2.0 |
| * Jesper Steen Moller - bug 281159 - fix document loading and resolving URIs |
| * Mukul Gandhi - bug 280798 - PsychoPath support for JDK 1.4 |
| *******************************************************************************/ |
| |
| package org.eclipse.wst.xml.xpath2.processor.internal.function; |
| |
| import org.eclipse.wst.xml.xpath2.processor.DynamicContext; |
| import org.eclipse.wst.xml.xpath2.processor.DynamicError; |
| import org.eclipse.wst.xml.xpath2.processor.ResultSequence; |
| import org.eclipse.wst.xml.xpath2.processor.ResultSequenceFactory; |
| import org.eclipse.wst.xml.xpath2.processor.internal.SeqType; |
| import org.eclipse.wst.xml.xpath2.processor.internal.types.DocType; |
| import org.eclipse.wst.xml.xpath2.processor.internal.types.QName; |
| import org.eclipse.wst.xml.xpath2.processor.internal.types.XSString; |
| import org.w3c.dom.Document; |
| |
| import java.net.URI; |
| import java.net.URISyntaxException; |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.Map; |
| |
| /** |
| * Summary: This function takes an xs:string as argument and returns a sequence |
| * of nodes obtained by interpreting $arg as an xs:anyURI and resolving it |
| * according to the mapping specified in Available collections described in |
| * Section C.2 Dynamic Context Components. If Available collections provides a |
| * mapping from this string to a sequence of nodes, the function returns that |
| * sequence. If Available collections maps the string to an empty sequence, |
| * then the function returns an empty sequence. If Available collections |
| * provides no mapping for the string, an error is raised [err:FODC0004]. If |
| * $arg is not specified, the function returns the sequence of the nodes in the |
| * default collection in the dynamic context. See Section C.2 Dynamic Context |
| * ComponentsXP. If the value of the default collection is undefined an error |
| * is raised [err:FODC0002]. |
| * |
| * If the $arg is a relative xs:anyURI, it is resolved against the value of the |
| * base-URI property from the static context. If $arg is not a valid xs:anyURI, |
| * an error is raised [err:FODC0004]. |
| * |
| * If $arg is the empty sequence, the function behaves as if it had been called |
| * without an argument. See above. |
| * |
| * By default, this function is ·stable·. This means that repeated calls on the |
| * function with the same argument will return the same result. However, for |
| * performance reasons, implementations may provide a user option to evaluate |
| * the function without a guarantee of stability. The manner in which any such |
| * option is provided is ·implementation-defined·. If the user has not selected |
| * such an option, a call to this function must either return a stable result or |
| * must raise an error: [err:FODC0003]. |
| */ |
| public class FnCollection extends Function { |
| private static Collection _expected_args = null; |
| |
| public static final String DEFAULT_COLLECTION_URI = "http://www.w3.org/2005/xpath-functions/collection/default"; |
| |
| /** |
| * Constructor for FnDoc. |
| */ |
| public FnCollection() { |
| super(new QName("collection"), 0, 1); |
| } |
| |
| /** |
| * Evaluate arguments. |
| * |
| * @param args |
| * argument expressions. |
| * @throws DynamicError |
| * Dynamic error. |
| * @return Result of evaluation. |
| */ |
| public ResultSequence evaluate(Collection args) throws DynamicError { |
| return collection(args, dynamic_context()); |
| } |
| |
| /** |
| * Doc operation. |
| * |
| * @param args |
| * Result from the expressions evaluation. |
| * @param dc |
| * Result of dynamic context operation. |
| * @throws DynamicError |
| * Dynamic error. |
| * @return Result of fn:doc operation. |
| */ |
| public static ResultSequence collection(Collection args, DynamicContext dc) |
| throws DynamicError { |
| Collection cargs = Function.convert_arguments(args, expected_args()); |
| |
| // get args |
| Iterator argiter = cargs.iterator(); |
| ResultSequence arg1 = null; |
| ResultSequence rs = ResultSequenceFactory.create_new(); |
| if (argiter.hasNext()) { |
| arg1 = (ResultSequence) argiter.next(); |
| } else { |
| return getCollection(DEFAULT_COLLECTION_URI, dc); |
| } |
| |
| |
| if (arg1.empty()) |
| return ResultSequenceFactory.create_new(); |
| |
| String uri = ((XSString) arg1.first()).value(); |
| |
| |
| try { |
| new URI(uri); |
| } catch (URISyntaxException ex) { |
| throw DynamicError.doc_not_found(null); |
| } |
| |
| if (uri.indexOf(":") < 0) { |
| throw DynamicError.invalidCollectionArgument(); |
| } |
| |
| |
| URI resolved = dc.resolve_uri(uri); |
| if (resolved == null) |
| throw DynamicError.invalid_doc(null); |
| |
| rs = getCollection(uri, dc); |
| if (rs.empty()) |
| throw DynamicError.doc_not_found(null); |
| |
| return rs; |
| } |
| |
| /** |
| * Obtain a list of expected arguments. |
| * |
| * @return Result of operation. |
| */ |
| public synchronized static Collection expected_args() { |
| if (_expected_args == null) { |
| _expected_args = new ArrayList(); |
| SeqType arg = new SeqType(new XSString(), SeqType.OCC_QMARK); |
| _expected_args.add(arg); |
| } |
| |
| return _expected_args; |
| } |
| |
| private static ResultSequence getCollection(String uri, DynamicContext dc) { |
| ResultSequence rs = ResultSequenceFactory.create_new(); |
| Map collectionMap = dc.get_collections(); |
| List docList = (List)collectionMap.get(uri); |
| for (int i = 0; i < docList.size(); i++) { |
| Document doc = (Document)docList.get(i); |
| rs.add(new DocType(doc)); |
| } |
| return rs; |
| |
| } |
| } |