| /******************************************************************************* |
| * Copyright (c) 2009, 2010 Mukul Gandhi, 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: |
| * Mukul Gandhi - initial API and implementation |
| * Mukul Gandhi - bug 280798 - PsychoPath support for JDK 1.4 |
| *******************************************************************************/ |
| |
| package org.eclipse.wst.xml.xpath2.processor.internal.function; |
| |
| import java.util.ArrayList; |
| import java.util.Collection; |
| |
| import javax.xml.XMLConstants; |
| |
| import org.eclipse.wst.xml.xpath2.api.EvaluationContext; |
| import org.eclipse.wst.xml.xpath2.api.ResultBuffer; |
| import org.eclipse.wst.xml.xpath2.api.ResultSequence; |
| import org.eclipse.wst.xml.xpath2.api.StaticContext; |
| import org.eclipse.wst.xml.xpath2.processor.DynamicError; |
| import org.eclipse.wst.xml.xpath2.processor.internal.SeqType; |
| import org.eclipse.wst.xml.xpath2.processor.internal.types.QName; |
| import org.eclipse.wst.xml.xpath2.processor.internal.types.XSNCName; |
| |
| /** |
| * Returns an xs:NCName representing the prefix for $arg. If $arg is the empty |
| * sequence, or $arg has no prefix, an empty sequence is returned. |
| */ |
| public class FnPrefixFromQName extends Function { |
| private static Collection _expected_args = null; |
| |
| /** |
| * Constructor for FnPrefixFromQName |
| */ |
| public FnPrefixFromQName() { |
| super(new QName("prefix-from-QName"), 1); |
| } |
| |
| /** |
| * Evaluate arguments. |
| * |
| * @param args |
| * argument expressions. |
| * @throws DynamicError |
| * Dynamic error. |
| * @return Result of evaluation. |
| */ |
| public ResultSequence evaluate(Collection args, EvaluationContext ec) { |
| return prefix(args, ec.getStaticContext()); |
| } |
| |
| /** |
| * Prefix-from-QName operation. |
| * |
| * @param args |
| * Result from the expressions evaluation. |
| * @throws DynamicError |
| * Dynamic error. |
| * @return Result of fn:prefix-from-QName operation. |
| */ |
| public static ResultSequence prefix(Collection args, StaticContext sc) throws DynamicError { |
| |
| Collection cargs = Function.convert_arguments(args, expected_args()); |
| |
| // get arg |
| ResultSequence arg1 = (ResultSequence) cargs.iterator().next(); |
| |
| if (arg1.empty()) |
| return ResultBuffer.EMPTY; |
| |
| QName qname = (QName) arg1.first(); |
| |
| String prefix = qname.prefix(); |
| |
| if (prefix != null) { |
| if (! XMLConstants.NULL_NS_URI.equals(sc.getNamespaceContext().getNamespaceURI(prefix))) { |
| return new XSNCName(prefix); |
| } else { |
| throw DynamicError.invalidPrefix(); |
| } |
| } |
| return ResultBuffer.EMPTY; |
| } |
| |
| /** |
| * 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 QName(), SeqType.OCC_QMARK); |
| _expected_args.add(arg); |
| } |
| |
| return _expected_args; |
| } |
| } |