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SinglePrefer.java
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/
SinglePrefer.java
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/**
* Copyright 2015 DuraSpace, Inc.
*
* Licensed 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.fcrepo.http.commons.domain;
import static org.fcrepo.http.commons.domain.PreferTag.emptyTag;
import java.text.ParseException;
import java.util.Set;
import java.util.TreeSet;
import org.glassfish.jersey.message.internal.HttpHeaderReader;
/**
* JAX-RS HTTP parameter parser for the Prefer header
*
* @author cabeer
* @author ajs6f
* @author acoburn
*/
public class SinglePrefer {
private final Set<PreferTag> preferTags = new TreeSet<>();
/**
* Parse a Prefer: header
*
* @param header the header
* @throws ParseException if parse exception occurred
*/
public SinglePrefer(final String header) throws ParseException {
preferTags.addAll(HttpHeaderReader.readList(PreferTag::new, header));
}
/**
* Does the Prefer: header have a return tag
*
* @return true if the header has a return tag
*/
public Boolean hasReturn() {
return preferTags().stream().map(PreferTag::getTag).anyMatch("return"::equals);
}
/**
* Does the Prefer: header have a return tag
*
* @return true if the header has a return tag
*/
public Boolean hasHandling() {
return preferTags().stream().map(PreferTag::getTag).anyMatch("handling"::equals);
}
/**
* Get the return tag, or a blank default, if none exists.
*
* @return return tag, or a blank default, if none exists
*/
public PreferTag getReturn() {
return preferTags().stream()
.filter(x -> x.getTag().equals("return"))
.findFirst().orElse(emptyTag());
}
/**
* Get the return tag, or a blank default, if none exists.
*
* @return return tag, or a blank default, if none exists
*/
public PreferTag getHandling() {
return preferTags().stream()
.filter(x -> x.getTag().equals("handling"))
.findFirst().orElse(emptyTag());
}
protected Set<PreferTag> preferTags() {
return preferTags;
}
}