| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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 org.apache.any23.extractor.xpath; |
| |
| import org.eclipse.rdf4j.model.Value; |
| |
| import java.util.Locale; |
| import java.util.Map; |
| |
| /** |
| * Represents a generic template term. |
| * |
| * @author Michele Mostarda (mostarda@fbk.eu) |
| */ |
| public abstract class Term<T extends Value> { |
| |
| /** |
| * Internal value. |
| */ |
| private final String internalValue; |
| |
| /** |
| * if true the #internalValue is a variable name, |
| * otherwise is a constant. |
| */ |
| private final boolean isVar; |
| |
| /** |
| * Constructor. |
| * |
| * @param internalValue internal term value. |
| * @param isVar if true the <code>internalValue</code> is a variable name, |
| * otherwise is a constant. |
| */ |
| protected Term(String internalValue, boolean isVar) { |
| this.internalValue = internalValue; |
| this.isVar = isVar; |
| } |
| |
| /** |
| * @return the internal value. |
| */ |
| public String getInternalValue() { |
| return internalValue; |
| } |
| |
| /** |
| * @return the isVar flag value. |
| */ |
| public boolean isVar() { |
| return isVar; |
| } |
| |
| /** |
| * Returns the value represented by this {@link Term} |
| * given the <code>varMapping</code>, the #isVar and #internalValue |
| * parameters. |
| * |
| * @param varMapping a map representing values of variables. |
| * @return the value for this term. |
| */ |
| public T getValue(Map<String, String> varMapping) { |
| final String value; |
| if(isVar) { |
| value = varMapping.get(internalValue); |
| if(value == null) { |
| throw new IllegalStateException( |
| String.format(Locale.ROOT, "Cannot find a valid value for variable '%s'", internalValue) |
| ); |
| } |
| } else { |
| value = internalValue; |
| } |
| return getValueInternal(value); |
| } |
| |
| protected abstract T getValueInternal(String value); |
| |
| @Override |
| public String toString() { |
| return isVar ? ( "?" + internalValue ) : internalValue; |
| } |
| } |