/*
* Copyright (c) 2010, 2019 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package org.glassfish.jersey.server.internal.inject;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.SortedSet;
import java.util.TreeSet;
import javax.ws.rs.core.MultivaluedMap;
Extract parameter value as a specific String
Java collection type. This class can be seen as a special, optimized, case of CollectionExtractor
. Author: Paul Sandoz, Marek Potociar
/**
* Extract parameter value as a specific {@code String} Java collection type.
* <p />
* This class can be seen as a special, optimized, case of {@link CollectionExtractor}.
*
* @author Paul Sandoz
* @author Marek Potociar
*/
abstract class StringCollectionExtractor implements MultivaluedParameterExtractor<Collection<String>> {
private final String parameter;
private final String defaultValue;
Create new string collection parameter extractor.
Params: - parameterName – parameter name.
- defaultValue – default parameter value.
/**
* Create new string collection parameter extractor.
*
* @param parameterName parameter name.
* @param defaultValue default parameter value.
*/
protected StringCollectionExtractor(String parameterName, String defaultValue) {
this.parameter = parameterName;
this.defaultValue = defaultValue;
}
@Override
public String getName() {
return parameter;
}
@Override
public String getDefaultValueString() {
return defaultValue;
}
@Override
public Collection<String> extract(MultivaluedMap<String, String> parameters) {
List<String> stringList = parameters.get(parameter);
final Collection<String> collection = newCollection();
if (stringList != null) {
collection.addAll(stringList);
} else if (defaultValue != null) {
collection.add(defaultValue);
}
return collection;
}
Get a new string collection instance that will be used to store the extracted parameters.
The method is overridden by concrete implementations to return an instance
of a proper collection sub-type.
Returns: instance of a proper collection sub-type
/**
* Get a new string collection instance that will be used to store the extracted parameters.
*
* The method is overridden by concrete implementations to return an instance
* of a proper collection sub-type.
*
* @return instance of a proper collection sub-type
*/
protected abstract Collection<String> newCollection();
private static final class ListString extends StringCollectionExtractor {
public ListString(String parameter, String defaultValue) {
super(parameter, defaultValue);
}
@Override
protected List<String> newCollection() {
return new ArrayList<String>();
}
}
private static final class SetString extends StringCollectionExtractor {
public SetString(String parameter, String defaultValue) {
super(parameter, defaultValue);
}
@Override
protected Set<String> newCollection() {
return new HashSet<String>();
}
}
private static final class SortedSetString extends StringCollectionExtractor {
public SortedSetString(String parameter, String defaultValue) {
super(parameter, defaultValue);
}
@Override
protected SortedSet<String> newCollection() {
return new TreeSet<String>();
}
}
Get string collection extractor instance supporting the given collection
class type for the parameter specified.
Params: - collectionType – collection type to be supported by the extractor.
- parameterName – extracted parameter name.
- defaultValue – default parameter value.
Returns: string collection extractor instance supporting the given collection
class type.
/**
* Get string collection extractor instance supporting the given collection
* class type for the parameter specified.
*
* @param collectionType collection type to be supported by the extractor.
* @param parameterName extracted parameter name.
* @param defaultValue default parameter value.
* @return string collection extractor instance supporting the given collection
* class type.
*/
public static StringCollectionExtractor getInstance(Class<?> collectionType, String parameterName, String defaultValue) {
if (List.class == collectionType) {
return new ListString(parameterName, defaultValue);
} else if (Set.class == collectionType) {
return new SetString(parameterName, defaultValue);
} else if (SortedSet.class == collectionType) {
return new SortedSetString(parameterName, defaultValue);
} else {
throw new RuntimeException("Unsupported collection type: " + collectionType.getName());
}
}
}