| /******************************************************************************* |
| * 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 |
| * Mukul Gandhi - bug 276134 - improvements to schema aware primitive type support |
| * for attribute/element nodes |
| * Jesper Steen Moeller - bug 285145 - implement full arity checking |
| * Mukul Gandhi - bug 280798 - PsychoPath support for JDK 1.4 |
| *******************************************************************************/ |
| |
| package org.eclipse.wst.xml.xpath2.processor.internal.function; |
| |
| import java.util.Collection; |
| import java.util.Iterator; |
| |
| import org.eclipse.wst.xml.xpath2.api.EvaluationContext; |
| import org.eclipse.wst.xml.xpath2.api.Item; |
| import org.eclipse.wst.xml.xpath2.api.ResultBuffer; |
| import org.eclipse.wst.xml.xpath2.api.ResultSequence; |
| import org.eclipse.wst.xml.xpath2.processor.internal.types.AnyAtomicType; |
| import org.eclipse.wst.xml.xpath2.processor.internal.types.AnyType; |
| import org.eclipse.wst.xml.xpath2.processor.internal.types.NodeType; |
| import org.eclipse.wst.xml.xpath2.processor.internal.types.QName; |
| |
| /** |
| * fn:data takes a sequence of items and returns a sequence of atomic values. |
| * The result of fn:data is the sequence of atomic values produced by applying |
| * the following rules to each item in $arg: - If the item is an atomic value, |
| * it is returned. - If the item is a node, fn:data() returns the typed value of |
| * the node as defined by the accessor function dm:typed-value in Section 5.6 |
| * typed-value Accessor in the specification. |
| */ |
| public class FnData extends Function { |
| /** |
| * Constructor for FnData. |
| */ |
| public FnData() { |
| super(new QName("data"), 1); |
| } |
| |
| /** |
| * Evaluate arguments. |
| * |
| * @param args |
| * argument expressions. |
| * @return Result of evaluation. |
| */ |
| public ResultSequence evaluate(Collection args, EvaluationContext ec) { |
| // 1 argument only! |
| assert args.size() >= min_arity() && args.size() <= max_arity(); |
| |
| ResultSequence argument = (ResultSequence) args.iterator().next(); |
| |
| return atomize(argument); |
| } |
| |
| /** |
| * Atomize a ResultSequnce argument expression. |
| * |
| * @param arg |
| * input expression. |
| * @return Result of operation. |
| */ |
| public static ResultSequence atomize(ResultSequence arg) { |
| |
| ResultBuffer rs = new ResultBuffer(); |
| |
| for (Iterator i = arg.iterator(); i.hasNext();) { |
| AnyType at = (AnyType) i.next(); |
| |
| if (at instanceof AnyAtomicType) { |
| rs.add(at); |
| } |
| else if (at instanceof NodeType) { |
| NodeType nt = (NodeType) at; |
| rs.concat(nt.typed_value()); |
| } else { |
| assert false; |
| } |
| } |
| |
| return rs.getSequence(); |
| } |
| |
| /** |
| * Atomize argument expression of any type. |
| * |
| * @param arg |
| * input expression. |
| * @return Result of operation. |
| */ |
| public static AnyType atomize(Item arg) { |
| if (arg instanceof AnyAtomicType) |
| return (AnyAtomicType)arg; |
| else if (arg instanceof NodeType) { |
| NodeType nt = (NodeType) arg; |
| |
| return (AnyType) nt.typed_value().first(); |
| } else { |
| assert false; |
| return null; |
| } |
| } |
| } |