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org.apache.cxf.jaxrs.ext.search.ParamConverterUtils Maven / Gradle / Ivy
/**
* 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.cxf.jaxrs.ext.search;
import java.lang.annotation.Annotation;
import javax.ws.rs.ext.ParamConverter;
import javax.ws.rs.ext.ParamConverterProvider;
/**
* Helper class to work with parameter converter providers and parameter converters.
*/
public final class ParamConverterUtils {
private ParamConverterUtils() {
}
/**
* Converts the string-based representation of the value to the instance of particular type
* using parameter converter provider and available parameter converter.
* @param type type to convert from string-based representation
* @param provider parameter converter provider to use
* @param value the string-based representation to convert
* @return instance of particular type converter from its string representation
*/
@SuppressWarnings("unchecked")
public static< T > T getValue(final Class< T > type, final ParamConverterProvider provider,
final String value) {
if (String.class.isAssignableFrom(type)) {
return (T)value;
}
if (provider != null) {
final ParamConverter< T > converter = provider.getConverter(type, null, new Annotation[0]);
if (converter != null) {
return converter.fromString(value);
}
}
throw new IllegalArgumentException(String.format(
"Unable to convert string '%s' to instance of class '%s': no appropriate converter provided",
value, type.getName()));
}
/**
* Converts the instance of particular type into its string-based representation
* using parameter converter provider and available parameter converter.
* @param type type to convert to string-based representation
* @param provider parameter converter provider to use
* @param value the typed instance to convert to string representation
* @return string-based representation of the instance of particular type
*/
public static< T > String getString(final Class< T > type, final ParamConverterProvider provider,
final T value) {
if (provider != null) {
final ParamConverter< T > converter = provider.getConverter(type, null, new Annotation[0]);
if (converter != null) {
return converter.toString(value);
}
}
return value == null ? null : value.toString();
}
}