| /******************************************************************************* |
| * 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 - improvements to the function implementation |
| * David Carver - bug 282096 - improvements for surrogate handling |
| * Jesper Steen Moeller - bug 282096 - clean up string storage |
| * Jesper Steen Moeller - bug 280553 - further checks of legal Unicode codepoints. |
| * 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 java.util.Iterator; |
| |
| import org.eclipse.wst.xml.xpath2.api.ResultSequence; |
| 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.XSInteger; |
| import org.eclipse.wst.xml.xpath2.processor.internal.types.XSString; |
| |
| import com.ibm.icu.text.UTF16; |
| |
| /** |
| * Creates an xs:string from a sequence of code points. Returns the zero-length |
| * string if $arg is the empty sequence. If any of the code points in $arg is |
| * not a legal XML character, an error is raised [err:FOCH0001]. |
| */ |
| public class FnCodepointsToString extends Function { |
| private static Collection _expected_args = null; |
| |
| /** |
| * The maximum value of a Unicode code point. |
| */ |
| public static final int MIN_LEGAL_CODEPOINT = 0x1; |
| |
| |
| /** |
| * The maximum value of a Unicode code point. |
| */ |
| public static final int MAX_LEGAL_CODEPOINT = 0x10ffff; |
| |
| /** |
| * Constructor for FnCodepointsToString. |
| */ |
| public FnCodepointsToString() { |
| super(new QName("codepoints-to-string"), 1); |
| } |
| |
| /** |
| * Evaluate arguments. |
| * |
| * @param args |
| * argument expressions. |
| * @throws DynamicError |
| * Dynamic error. |
| * @return Result of evaluation. |
| */ |
| public ResultSequence evaluate(Collection args, org.eclipse.wst.xml.xpath2.api.EvaluationContext ec) throws DynamicError { |
| return codepoints_to_string(args); |
| } |
| |
| /** |
| * Codepoints to string operation. |
| * |
| * @param args |
| * Result from the expressions evaluation. |
| * @throws DynamicError |
| * Dynamic error. |
| * @return Result of fn:codepoints-to-string operation. |
| */ |
| public static ResultSequence codepoints_to_string(Collection args) |
| throws DynamicError { |
| Collection cargs = Function.convert_arguments(args, expected_args()); |
| |
| ResultSequence arg1 = (ResultSequence) cargs.iterator().next(); |
| if (arg1.empty()) { |
| return new XSString(""); |
| } |
| |
| int[] codePointArray = new int[arg1.size()]; |
| int codePointIndex = 0; |
| for (Iterator i = arg1.iterator(); i.hasNext();) { |
| XSInteger code = (XSInteger) i.next(); |
| |
| int codepoint = code.int_value().intValue(); |
| if (codepoint < MIN_LEGAL_CODEPOINT || codepoint > MAX_LEGAL_CODEPOINT) { |
| throw DynamicError.unsupported_codepoint("U+" + Integer.toString(codepoint, 16).toUpperCase()); |
| } |
| |
| codePointArray[codePointIndex] = codepoint; |
| codePointIndex++; |
| } |
| |
| try { |
| String str = UTF16.newString(codePointArray, 0, codePointArray.length); |
| return new XSString(str); |
| } catch (IllegalArgumentException iae) { |
| // This should be duoble checked above, but rather safe than sorry |
| throw DynamicError.unsupported_codepoint(iae.getMessage()); |
| } |
| } |
| |
| /** |
| * Obtain a list of expected arguments. |
| * |
| * @return Result of operation. |
| */ |
| public synchronized static Collection expected_args() { |
| if (_expected_args == null) { |
| _expected_args = new ArrayList(); |
| _expected_args.add(new SeqType(new XSInteger(), SeqType.OCC_STAR)); |
| } |
| |
| return _expected_args; |
| } |
| } |