FunctionCall.java
/*
* Portions of this software was developed by employees of the National Institute
* of Standards and Technology (NIST), an agency of the Federal Government and is
* being made available as a public service. Pursuant to title 17 United States
* Code Section 105, works of NIST employees are not subject to copyright
* protection in the United States. This software may be subject to foreign
* copyright. Permission in the United States and in foreign countries, to the
* extent that NIST may hold copyright, to use, copy, modify, create derivative
* works, and distribute this software and its documentation without fee is hereby
* granted on a non-exclusive basis, provided that this notice and disclaimer
* of warranty appears in all copies.
*
* THE SOFTWARE IS PROVIDED 'AS IS' WITHOUT ANY WARRANTY OF ANY KIND, EITHER
* EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, ANY WARRANTY
* THAT THE SOFTWARE WILL CONFORM TO SPECIFICATIONS, ANY IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND FREEDOM FROM
* INFRINGEMENT, AND ANY WARRANTY THAT THE DOCUMENTATION WILL CONFORM TO THE
* SOFTWARE, OR ANY WARRANTY THAT THE SOFTWARE WILL BE ERROR FREE. IN NO EVENT
* SHALL NIST BE LIABLE FOR ANY DAMAGES, INCLUDING, BUT NOT LIMITED TO, DIRECT,
* INDIRECT, SPECIAL OR CONSEQUENTIAL DAMAGES, ARISING OUT OF, RESULTING FROM,
* OR IN ANY WAY CONNECTED WITH THIS SOFTWARE, WHETHER OR NOT BASED UPON WARRANTY,
* CONTRACT, TORT, OR OTHERWISE, WHETHER OR NOT INJURY WAS SUSTAINED BY PERSONS OR
* PROPERTY OR OTHERWISE, AND WHETHER OR NOT LOSS WAS SUSTAINED FROM, OR AROSE OUT
* OF THE RESULTS OF, OR USE OF, THE SOFTWARE OR SERVICES PROVIDED HEREUNDER.
*/
package gov.nist.secauto.metaschema.core.metapath;
import gov.nist.secauto.metaschema.core.metapath.function.FunctionService;
import gov.nist.secauto.metaschema.core.metapath.function.IFunction;
import gov.nist.secauto.metaschema.core.metapath.item.IItem;
import gov.nist.secauto.metaschema.core.util.ObjectUtils;
import java.util.List;
import java.util.Objects;
import java.util.stream.Collectors;
import edu.umd.cs.findbugs.annotations.NonNull;
class FunctionCall implements IExpression {
@NonNull
private final String name;
@NonNull
private final List<IExpression> arguments;
private IFunction function;
/**
* Construct a new function call expression.
*
* @param name
* the function name
* @param arguments
* the expressions used to provide arguments to the function call
*/
protected FunctionCall(@NonNull String name, @NonNull List<IExpression> arguments) {
this.name = Objects.requireNonNull(name, "name");
this.arguments = Objects.requireNonNull(arguments, "arguments");
}
/**
* Retrieve the associated function.
*
* @return the function or {@code null} if no function matched the defined name
* and arguments
* @throws StaticMetapathException
* if the function was not found
*/
public IFunction getFunction() {
synchronized (this) {
if (function == null) {
function = FunctionService.getInstance().getFunction(name, arguments);
}
return function;
}
}
@Override
public List<IExpression> getChildren() {
return arguments;
}
@Override
public Class<? extends IItem> getBaseResultType() {
Class<? extends IItem> retval = getFunction().getResult().getType();
if (retval == null) {
retval = IItem.class;
}
return retval;
}
@SuppressWarnings("null")
@Override
public String toASTString() {
return String.format("%s[name=%s]", getClass().getName(), getFunction().getName());
}
@Override
public <RESULT, CONTEXT> RESULT accept(IExpressionVisitor<RESULT, CONTEXT> visitor, CONTEXT context) {
return visitor.visitFunctionCall(this, context);
}
@Override
public ISequence<?> accept(DynamicContext dynamicContext, ISequence<?> focus) {
List<ISequence<?>> arguments = ObjectUtils.notNull(getChildren().stream().map(expression -> {
@NonNull ISequence<?> result = expression.accept(dynamicContext, focus);
return result;
}).collect(Collectors.toList()));
IFunction function = getFunction();
return function.execute(arguments, dynamicContext, focus);
}
}