1 /* 2 * Portions of this software was developed by employees of the National Institute 3 * of Standards and Technology (NIST), an agency of the Federal Government and is 4 * being made available as a public service. Pursuant to title 17 United States 5 * Code Section 105, works of NIST employees are not subject to copyright 6 * protection in the United States. This software may be subject to foreign 7 * copyright. Permission in the United States and in foreign countries, to the 8 * extent that NIST may hold copyright, to use, copy, modify, create derivative 9 * works, and distribute this software and its documentation without fee is hereby 10 * granted on a non-exclusive basis, provided that this notice and disclaimer 11 * of warranty appears in all copies. 12 * 13 * THE SOFTWARE IS PROVIDED 'AS IS' WITHOUT ANY WARRANTY OF ANY KIND, EITHER 14 * EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, ANY WARRANTY 15 * THAT THE SOFTWARE WILL CONFORM TO SPECIFICATIONS, ANY IMPLIED WARRANTIES OF 16 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND FREEDOM FROM 17 * INFRINGEMENT, AND ANY WARRANTY THAT THE DOCUMENTATION WILL CONFORM TO THE 18 * SOFTWARE, OR ANY WARRANTY THAT THE SOFTWARE WILL BE ERROR FREE. IN NO EVENT 19 * SHALL NIST BE LIABLE FOR ANY DAMAGES, INCLUDING, BUT NOT LIMITED TO, DIRECT, 20 * INDIRECT, SPECIAL OR CONSEQUENTIAL DAMAGES, ARISING OUT OF, RESULTING FROM, 21 * OR IN ANY WAY CONNECTED WITH THIS SOFTWARE, WHETHER OR NOT BASED UPON WARRANTY, 22 * CONTRACT, TORT, OR OTHERWISE, WHETHER OR NOT INJURY WAS SUSTAINED BY PERSONS OR 23 * PROPERTY OR OTHERWISE, AND WHETHER OR NOT LOSS WAS SUSTAINED FROM, OR AROSE OUT 24 * OF THE RESULTS OF, OR USE OF, THE SOFTWARE OR SERVICES PROVIDED HEREUNDER. 25 */ 26 27 package gov.nist.secauto.metaschema.core.metapath; 28 29 import gov.nist.secauto.metaschema.core.metapath.function.library.FnData; 30 import gov.nist.secauto.metaschema.core.metapath.item.atomic.IStringItem; 31 import gov.nist.secauto.metaschema.core.util.ObjectUtils; 32 33 import java.util.List; 34 35 import edu.umd.cs.findbugs.annotations.NonNull; 36 37 class StringConcat 38 extends AbstractNAryExpression { 39 40 /** 41 * Create a new expression that concatenates the results of evaluating the 42 * provided {@code expressions} as strings. 43 * 44 * @param expressions 45 * the expressions to evaluate 46 */ 47 protected StringConcat(@NonNull List<IExpression> expressions) { 48 super(expressions); 49 } 50 51 @Override 52 public Class<IStringItem> getBaseResultType() { 53 return IStringItem.class; 54 } 55 56 @Override 57 public Class<IStringItem> getStaticResultType() { 58 return getBaseResultType(); 59 } 60 61 @Override 62 public <RESULT, CONTEXT> RESULT accept(IExpressionVisitor<RESULT, CONTEXT> visitor, CONTEXT context) { 63 return visitor.visitStringConcat(this, context); 64 } 65 66 @Override 67 public ISequence<?> accept(DynamicContext dynamicContext, ISequence<?> focus) { 68 // TODO: replace with concat function when implemented 69 StringBuilder builder = new StringBuilder(); 70 for (IExpression child : getChildren()) { 71 ISequence<?> result = child.accept(dynamicContext, focus); 72 FnData.fnData(result).asStream() 73 .forEachOrdered(item -> { 74 builder.append(item.asString()); 75 }); 76 } 77 return ISequence.of(IStringItem.valueOf(ObjectUtils.notNull(builder.toString()))); 78 } 79 }