org.apache.cxf.jaxrs.impl.LinkHeaderProvider 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.impl;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import javax.ws.rs.core.Link;
import javax.ws.rs.ext.RuntimeDelegate.HeaderDelegate;
import org.apache.cxf.common.util.StringUtils;
public class LinkHeaderProvider implements HeaderDelegate {
private static final String REL = "rel";
private static final String TYPE = "type";
private static final String TITLE = "title";
private static final Set KNOWN_PARAMETERS;
static {
KNOWN_PARAMETERS = new HashSet<>(Arrays.asList(REL, TYPE, TITLE));
}
public Link fromString(String value) {
if (value == null) {
throw new IllegalArgumentException("Link value can not be null");
}
value = value.trim();
int closeIndex = value.indexOf('>');
if (!value.startsWith("<") || closeIndex < 2) {
throw new IllegalArgumentException("Link URI is missing");
}
Link.Builder builder = new LinkBuilderImpl();
builder.uri(value.substring(1, closeIndex).trim());
if (closeIndex < value.length() - 1) {
String[] tokens = value.substring(closeIndex + 1).split(";");
for (String token : tokens) {
String theToken = token.trim();
if (theToken.isEmpty()) {
continue;
}
String paramName = null;
String paramValue = null;
int i = token.indexOf('=');
if (i != -1) {
paramName = theToken.substring(0, i).trim();
paramValue = i == theToken.length() - 1 ? "" : theToken.substring(i + 1).trim();
}
if (REL.equals(paramName)) {
String[] rels = removeQuotesIfNeeded(paramValue).split(",");
for (String rel : rels) {
builder.rel(rel.trim());
}
} else if (TYPE.equals(paramName)) {
builder.type(removeQuotesIfNeeded(paramValue));
} else if (TITLE.equals(paramName)) {
builder.title(removeQuotesIfNeeded(paramValue));
} else {
builder.param(paramName, paramValue);
}
}
}
return builder.build();
}
private static String removeQuotesIfNeeded(String value) {
if (value.length() > 1 && value.startsWith("\"") && value.endsWith("\"")) {
return value.substring(1, value.length() - 1);
}
return value;
}
public String toString(Link link) {
StringBuilder sb = new StringBuilder();
sb.append('<');
sb.append(link.getUri());
sb.append('>');
String rels = link.getRel();
if (!rels.isEmpty()) {
sb.append(';').append(REL).append('=');
writeListParamValues(sb, rels);
}
if (link.getTitle() != null) {
sb.append(';').append(TITLE).append("=\"").append(link.getTitle()).append('"');
}
if (link.getType() != null) {
sb.append(';').append(TYPE).append('=').append(link.getType());
}
for (Map.Entry entry : link.getParams().entrySet()) {
if (KNOWN_PARAMETERS.contains(entry.getKey())) {
continue;
}
sb.append(';').append(entry.getKey()).append('=');
writeListParamValues(sb, entry.getValue());
}
return sb.toString();
}
private void writeListParamValues(StringBuilder sb, String value) {
if (StringUtils.isEmpty(value)) {
return;
}
boolean commaAvailable = value.contains(",");
if (commaAvailable) {
sb.append('"');
}
sb.append(value);
if (commaAvailable) {
sb.append('"');
}
}
}