| /******************************************************************************* |
| * Copyright (c) 2009, 2010 Jesper Steen Moller, 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: |
| * Jesper Steen Moller - 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.math.BigInteger; |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.Iterator; |
| |
| import org.eclipse.wst.xml.xpath2.api.CollationProvider; |
| import org.eclipse.wst.xml.xpath2.api.DynamicContext; |
| 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.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.XSBoolean; |
| import org.eclipse.wst.xml.xpath2.processor.internal.types.XSString; |
| |
| /** |
| * |
| * <p> |
| * String comparison function. |
| * </p> |
| * |
| * <p> |
| * Usage: fn:codepoint-equal($comparand1 as xs:string?, |
| * $comparand2 as xs:string?) as xs:boolean? |
| * </p> |
| * |
| * <p> |
| * Returns true or false depending on whether the value of $comparand1 is equal |
| * to the value of $comparand2, according to the Unicode code point collation |
| * (http://www.w3.org/2005/xpath-functions/collation/codepoint). |
| * </p> |
| * |
| * <p> |
| * If either argument is the empty sequence, the result is the empty sequence. |
| * </p> |
| * |
| */ |
| public class FnCodepointEqual extends Function { |
| |
| private static Collection _expected_args = null; |
| |
| /** |
| * Constructor of FnCodepointEqual. |
| */ |
| public FnCodepointEqual() { |
| super(new QName("codepoint-equal"), 2); |
| } |
| |
| /** |
| * Evaluate the arguments. |
| * |
| * @param args |
| * is evaluated. |
| * @throws DynamicError |
| * Dynamic error. |
| * @return The evaluation of the comparison of the arguments. |
| */ |
| public ResultSequence evaluate(Collection args, EvaluationContext ec) throws DynamicError { |
| return codepoint_equals(args, ec.getDynamicContext()); |
| } |
| |
| /** |
| * Compare the arguments as codepoints |
| * |
| * @param args |
| * are compared. |
| * @param dynamicContext |
| * The current dynamic context |
| * @throws DynamicError |
| * Dynamic error. |
| * @return The result of the comparison of the arguments. |
| */ |
| public static ResultSequence codepoint_equals(Collection args, DynamicContext dynamicContext) throws DynamicError { |
| Collection cargs = Function.convert_arguments(args, expected_args()); |
| |
| ResultBuffer rs = new ResultBuffer(); |
| |
| Iterator argiter = cargs.iterator(); |
| ResultSequence arg1 = (ResultSequence) argiter.next(); |
| XSString xstr1 = arg1.empty() ? null : (XSString) arg1.first(); |
| |
| ResultSequence arg2 = (ResultSequence) argiter.next(); |
| XSString xstr2 = arg2.empty() ? null : (XSString) arg2.first(); |
| |
| // This delegates to FnCompare |
| BigInteger result = FnCompare.compare_string(CollationProvider.CODEPOINT_COLLATION, xstr1, xstr2, dynamicContext); |
| if (result != null) rs.add(new XSBoolean(BigInteger.ZERO.equals(result))); |
| |
| return rs.getSequence(); |
| } |
| |
| /** |
| * Calculate the expected arguments. |
| * |
| * @return The expected arguments. |
| */ |
| public synchronized static Collection expected_args() { |
| if (_expected_args == null) { |
| _expected_args = new ArrayList(); |
| SeqType arg = new SeqType(new XSString(), SeqType.OCC_QMARK); |
| _expected_args.add(arg); |
| _expected_args.add(arg); |
| } |
| |
| return _expected_args; |
| } |
| } |