org.glassfish.jersey.server.internal.inject.StringCollectionExtractor Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of ehcache Show documentation
Show all versions of ehcache Show documentation
Ehcache is an open source, standards-based cache used to boost performance,
offload the database and simplify scalability. Ehcache is robust, proven and full-featured and
this has made it the most widely-used Java-based cache.
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 2010-2013 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* http://glassfish.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
* If applicable, add the following below the License Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
* "Portions Copyright [year] [name of copyright owner]"
*
* Contributor(s):
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*/
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 {@code String} Java collection type.
*
* This class can be seen as a special, optimized, case of {@link CollectionExtractor}.
*
* @author Paul Sandoz
* @author Marek Potociar (marek.potociar at oracle.com)
*/
abstract class StringCollectionExtractor implements MultivaluedParameterExtractor> {
private final String parameter;
private final String defaultValue;
/**
* 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 extract(MultivaluedMap parameters) {
List stringList = parameters.get(parameter);
final Collection 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.
*
* @return instance of a proper collection sub-type
*/
protected abstract Collection newCollection();
private static final class ListString extends StringCollectionExtractor {
public ListString(String parameter, String defaultValue) {
super(parameter, defaultValue);
}
@Override
protected List newCollection() {
return new ArrayList();
}
}
private static final class SetString extends StringCollectionExtractor {
public SetString(String parameter, String defaultValue) {
super(parameter, defaultValue);
}
@Override
protected Set newCollection() {
return new HashSet();
}
}
private static final class SortedSetString extends StringCollectionExtractor {
public SortedSetString(String parameter, String defaultValue) {
super(parameter, defaultValue);
}
@Override
protected SortedSet newCollection() {
return new TreeSet();
}
}
/**
* 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());
}
}
}