StringConcat.java
/*
* SPDX-FileCopyrightText: none
* SPDX-License-Identifier: CC0-1.0
*/
package gov.nist.secauto.metaschema.core.metapath.cst;
import gov.nist.secauto.metaschema.core.metapath.DynamicContext;
import gov.nist.secauto.metaschema.core.metapath.ISequence;
import gov.nist.secauto.metaschema.core.metapath.function.library.FnData;
import gov.nist.secauto.metaschema.core.metapath.item.atomic.IStringItem;
import gov.nist.secauto.metaschema.core.util.ObjectUtils;
import java.util.List;
import edu.umd.cs.findbugs.annotations.NonNull;
public class StringConcat
extends AbstractNAryExpression {
/**
* Create a new expression that concatenates the results of evaluating the
* provided {@code expressions} as strings.
*
* @param expressions
* the expressions to evaluate
*/
public StringConcat(@NonNull List<IExpression> expressions) {
super(expressions);
}
@Override
public Class<IStringItem> getBaseResultType() {
return IStringItem.class;
}
@Override
public Class<IStringItem> getStaticResultType() {
return getBaseResultType();
}
@Override
public <RESULT, CONTEXT> RESULT accept(IExpressionVisitor<RESULT, CONTEXT> visitor, CONTEXT context) {
return visitor.visitStringConcat(this, context);
}
@Override
public ISequence<?> accept(DynamicContext dynamicContext, ISequence<?> focus) {
// TODO: replace with concat function when implemented
StringBuilder builder = new StringBuilder();
for (IExpression child : getChildren()) {
ISequence<?> result = child.accept(dynamicContext, focus);
FnData.fnData(result).stream()
.forEachOrdered(item -> {
builder.append(item.asString());
});
}
return ISequence.of(IStringItem.valueOf(ObjectUtils.notNull(builder.toString())));
}
}