| /******************************************************************************* |
| * 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 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 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.types.AnyType; |
| import org.eclipse.wst.xml.xpath2.processor.internal.types.QName; |
| import org.eclipse.wst.xml.xpath2.processor.internal.types.XSString; |
| |
| import java.util.Collection; |
| import java.util.Iterator; |
| |
| /** |
| * <p> |
| * Sequence concatenation function. |
| * </p> |
| * |
| * <p> |
| * Usage: fn:concat($arg1 as xdt:anyAtomicType?, $arg2 as xdt:anyAtomicType?, |
| * ... ) as xs:string |
| * </p> |
| * |
| * <p> |
| * This class accepts two or more xdt:anyAtomicType arguments and converts them |
| * to xs:string. It then returns the xs:string that is the concatenation of the |
| * values of its arguments after conversion. If any of the arguments is the |
| * empty sequence, the argument is treated as the zero-length string. |
| * </p> |
| * |
| * <p> |
| * The concat() function is specified to allow an arbitrary number of arguments |
| * that are concatenated together. |
| * </p> |
| */ |
| public class FnConcat extends Function { |
| |
| /** |
| * Constructor for FnConcat. |
| */ |
| public FnConcat() { |
| super(new QName("concat"), 2, Integer.MAX_VALUE); |
| } |
| |
| /** |
| * Evaluate the arguments. |
| * |
| * @param args |
| * is evaluated. |
| * @throws DynamicError |
| * Dynamic error. |
| * @return The evaluation of the concatenation of the arguments. |
| */ |
| public ResultSequence evaluate(Collection args) throws DynamicError { |
| return concat(args); |
| } |
| |
| /** |
| * Concatenate the arguments. |
| * |
| * @param args |
| * are concatenated. |
| * @throws DynamicError |
| * Dynamic error. |
| * @return The result of the concatenation of the arguments. |
| */ |
| public static ResultSequence concat(Collection args) throws DynamicError { |
| |
| // sanity check |
| if (args.size() < 2) |
| DynamicError.throw_type_error(); |
| |
| ResultSequence rs = ResultSequenceFactory.create_new(); |
| |
| String result = ""; |
| |
| // go through args |
| StringBuffer buf = new StringBuffer(); |
| for (Iterator argi = args.iterator(); argi.hasNext();) { |
| ResultSequence arg = (ResultSequence) argi.next(); |
| |
| int size = arg.size(); |
| |
| // sanity check |
| if (size > 1) |
| DynamicError.throw_type_error(); |
| |
| if (size == 0) { |
| continue; |
| } |
| |
| AnyType at = arg.first(); |
| |
| buf.append(at.string_value()); |
| |
| } |
| result = buf.toString(); |
| |
| rs.add(new XSString(result)); |
| |
| return rs; |
| } |
| } |