| /******************************************************************************* |
| * 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 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.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; |
| |
| /** |
| * The input $value is returned, unchanged, as the result of the function. In |
| * addition, the inputs $value, converted to an xs:string, and $label may be |
| * directed to a trace data set. The location and format of the trace data set |
| * are implementation dependent. The ordering of output from invocations of the |
| * fn:trace() function is implementation dependent. |
| */ |
| public class FnTrace extends Function { |
| /** |
| * Constructor for FnTrace. |
| */ |
| public FnTrace() { |
| super(new QName("trace"), 2); |
| } |
| |
| /** |
| * Evaluate arguments. |
| * |
| * @param args |
| * argument expressions. |
| * @throws DynamicError |
| * Dynamic error. |
| * @return Result of evaluation. |
| */ |
| public ResultSequence evaluate(Collection args) throws DynamicError { |
| return trace(args); |
| } |
| |
| /** |
| * Trace operation. |
| * |
| * @param args |
| * Result from the expressions evaluation. |
| * @throws DynamicError |
| * Dynamic error. |
| * @return Result of fn:trace operation. |
| */ |
| public static ResultSequence trace(Collection args) throws DynamicError { |
| |
| // sanity check args |
| if (args.size() != 2) |
| DynamicError.throw_type_error(); |
| |
| Iterator argsi = args.iterator(); |
| |
| ResultSequence arg1 = (ResultSequence) argsi.next(); |
| ResultSequence arg2 = (ResultSequence) argsi.next(); |
| |
| if (arg2.size() != 1) |
| DynamicError.throw_type_error(); |
| |
| AnyType at = arg2.first(); |
| if (!(at instanceof XSString)) |
| DynamicError.throw_type_error(); |
| |
| XSString label = (XSString) at; |
| |
| int index = 1; |
| |
| for (Iterator i = arg1.iterator(); i.hasNext(); index++) { |
| at = (AnyType) i.next(); |
| |
| System.out.println(label.value() + " [" + index + "] " |
| + at.string_type() + ":" + at.string_value()); |
| |
| } |
| |
| return arg1; |
| } |
| } |