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IdentifierTransformer.java
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IdentifierTransformer.java
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/**
* Copyright (C) 2016 Czech Technical University in Prague
*
* This program is free software: you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any
* later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details. You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package cz.cvut.kbss.jopa.utils;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URL;
import java.util.*;
import java.util.function.Function;
public class IdentifierTransformer {
private static final Set<Class<?>> ID_CLASSES = new HashSet<>(Arrays.asList(URI.class, URL.class, String.class));
private static final Map<Class<?>, Function<Object, ?>> TRANSFORMERS = initTransformers();
private IdentifierTransformer() {
throw new AssertionError();
}
private static Map<Class<?>, Function<Object, ?>> initTransformers() {
final Map<Class<?>, Function<Object, ?>> m = new HashMap<>(ID_CLASSES.size());
m.put(URI.class, val -> {
Objects.requireNonNull(val);
if (val instanceof URI) {
return val;
} else {
return URI.create(val.toString());
}
});
m.put(URL.class, val -> {
Objects.requireNonNull(val);
if (val instanceof URL) {
return val;
}
try {
return new URL(val.toString());
} catch (MalformedURLException e) {
throw new IllegalArgumentException("The identifier is not a valid URL.", e);
}
});
m.put(String.class, val -> {
Objects.requireNonNull(val);
return val.toString();
});
return m;
}
/**
* Transforms the specified value to the target identifier type (if possible).
*
* @param value The value to transform
* @param targetType Target type
* @return The transformed value
* @throws IllegalArgumentException If the target type is not a valid identifier type
*/
public static Object transformToIdentifier(Object value, Class<?> targetType) {
if (!isValidIdentifierType(targetType)) {
throw new IllegalArgumentException(
"The specified value " + value + " cannot be transformed to target type " + targetType);
}
return TRANSFORMERS.get(targetType).apply(value);
}
public static URI valueAsUri(Object value) {
return (URI) TRANSFORMERS.get(URI.class).apply(value);
}
/**
* Checks whether the specified type is an identifier type supported by JOPA.
*
* @param type The type to check
* @return {@code true} if type is supported identifier type, {@code false} otherwise
*/
public static boolean isValidIdentifierType(Class<?> type) {
return type != null && ID_CLASSES.contains(type);
}
/**
* Gets supported identifier types.
*
* @return Unmodifiable set of supported id types
*/
public static Set<Class<?>> getValidIdentifierTypes() {
return Collections.unmodifiableSet(ID_CLASSES);
}
}