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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;
/**
* @author ledvima1
*/
class IdentifierTransformer {
/**
* Transforms the specified value to the target type (if possible).
*
* @param value The value to transform
* @param targetType Target type
* @return The transformed value
*/
public Object transformToType(Object value, Class<?> targetType) {
if (targetType.isAssignableFrom(value.getClass())) {
return value;
}
if (URI.class.isAssignableFrom(targetType)) {
return URI.create(value.toString());
} else if (URL.class.isAssignableFrom(targetType)) {
return valueAsUrl(value);
} else if (String.class.isAssignableFrom(targetType)) {
return value.toString();
}
throw new IllegalArgumentException(
"The specified value " + value + " cannot be transformed to target type " + targetType);
}
URI valueAsUri(Object value) {
if (value instanceof URI) {
return (URI) value;
} else {
return URI.create(value.toString());
}
}
private URL valueAsUrl(Object value) {
try {
return new URL(value.toString());
} catch (MalformedURLException e) {
throw new IllegalArgumentException("The identifier is not a valid URL.", e);
}
}
}