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SameNameFunction.java
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SameNameFunction.java
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#set( $symbol_pound = '#' )
#set( $symbol_dollar = '$' )
#set( $symbol_escape = '\' )
/*
* This file is part of the PSL software.
* Copyright 2011 University of Maryland
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package ${package}.external;
import edu.umd.cs.psl.model.argument.Attribute;
import edu.umd.cs.psl.model.argument.GroundTerm;
import edu.umd.cs.psl.model.argument.type.ArgumentType;
import edu.umd.cs.psl.model.argument.type.ArgumentTypes;
import edu.umd.cs.psl.model.function.ExternalFunction;
import edu.umd.cs.psl.model.predicate.type.PredicateType;
import edu.umd.cs.psl.model.predicate.type.PredicateTypes;
/**
* This is an example external function.
*/
class SameNameFunction implements ExternalFunction {
/**
* Returns the value for the given arguments in the GroundTerm array. In this
* case the arguments are:
* GroundTerm[0] = Name 1
* GroundTerm[1] = Name 2
*/
@Override
public double[] getValue(GroundTerm... args) {
if (args[0] instanceof Attribute && args[1] instanceof Attribute) {
return ((String) ((Attribute) args[0]).getAttribute())
.equalsIgnoreCase((String) ((Attribute) args[1]).getAttribute())
? new double[] {1.0} : new double[] {0.0};
}
else throw new IllegalArgumentException("Strings only.");
}
/**
* Returns the number of arguments to the function.
*/
@Override
public int getArity() {
return 2;
}
/**
* Returns the type(s) of the argument(s) to the function. There should be as
* many types returned as the arity of the function. See {@link ArgumentTypes}
* for default types.
*/
@Override
public ArgumentType[] getArgumentTypes() {
return new ArgumentType[] {ArgumentTypes.Text, ArgumentTypes.Text};
}
/**
* Returns the predicate type associated with this function. See
* {@link PredicateTypes} for default types.
*/
@Override
public PredicateType getPredicateType() {
return PredicateTypes.SoftTruth;
}
}