450 lines
12 KiB
Java
Executable File
450 lines
12 KiB
Java
Executable File
/*
|
|
* Copyright 2012-2019 the original author or authors.
|
|
*
|
|
* 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.springframework.hateoas;
|
|
|
|
import lombok.AccessLevel;
|
|
import lombok.AllArgsConstructor;
|
|
import lombok.EqualsAndHashCode;
|
|
import lombok.Getter;
|
|
import lombok.experimental.Wither;
|
|
|
|
import java.io.Serializable;
|
|
import java.util.ArrayList;
|
|
import java.util.Collections;
|
|
import java.util.HashMap;
|
|
import java.util.List;
|
|
import java.util.Map;
|
|
import java.util.regex.Matcher;
|
|
import java.util.regex.Pattern;
|
|
|
|
import org.springframework.core.ResolvableType;
|
|
import org.springframework.http.HttpMethod;
|
|
import org.springframework.util.Assert;
|
|
import org.springframework.util.StringUtils;
|
|
|
|
import com.fasterxml.jackson.annotation.JsonIgnore;
|
|
import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
|
|
import com.fasterxml.jackson.annotation.JsonInclude;
|
|
|
|
/**
|
|
* Value object for links.
|
|
*
|
|
* @author Oliver Gierke
|
|
* @author Greg Turnquist
|
|
* @author Jens Schauder
|
|
*/
|
|
@JsonInclude(JsonInclude.Include.NON_NULL)
|
|
@JsonIgnoreProperties(value = "templated", ignoreUnknown = true)
|
|
@AllArgsConstructor(access = AccessLevel.PACKAGE)
|
|
@Getter
|
|
@EqualsAndHashCode(of = { "rel", "href", "hreflang", "media", "title", "deprecation", "affordances" })
|
|
public class Link implements Serializable {
|
|
|
|
private static final long serialVersionUID = -9037755944661782121L;
|
|
private static final String URI_PATTERN = "(https?|ftp|file)://[-a-zA-Z0-9+&@#/%?=~_|!:,.;]*[-a-zA-Z0-9+&@#/%=~_|]";
|
|
|
|
private static final Pattern URI_AND_ATTRIBUTES_PATTERN = Pattern.compile("<(.*)>;(.*)");
|
|
private static final Pattern KEY_AND_VALUE_PATTERN = Pattern
|
|
.compile("(\\w+)=\"(\\p{Lower}[\\p{Lower}\\p{Digit}\\.\\-\\s]*|" + URI_PATTERN + ")\"");
|
|
|
|
public static final String ATOM_NAMESPACE = "http://www.w3.org/2005/Atom";
|
|
|
|
/**
|
|
* @deprecated Use {@link IanaLinkRelation#SELF} instead.
|
|
*/
|
|
@Deprecated
|
|
public static final String REL_SELF = IanaLinkRelation.SELF.value();
|
|
|
|
/**
|
|
* @deprecated Use {@link IanaLinkRelation#FIRST} instead.
|
|
*/
|
|
@Deprecated
|
|
public static final String REL_FIRST = IanaLinkRelation.FIRST.value();
|
|
|
|
/**
|
|
* @deprecated Use {@link IanaLinkRelation#PREV} instead.
|
|
*/
|
|
@Deprecated
|
|
public static final String REL_PREVIOUS = IanaLinkRelation.PREV.value();
|
|
|
|
/**
|
|
* @deprecated Use {@link IanaLinkRelation#NEXT} instead.
|
|
*/
|
|
@Deprecated
|
|
public static final String REL_NEXT = IanaLinkRelation.NEXT.value();
|
|
|
|
/**
|
|
* @deprecated Use {@link IanaLinkRelation#LAST} instead.
|
|
*/
|
|
@Deprecated
|
|
public static final String REL_LAST = IanaLinkRelation.LAST.value();
|
|
|
|
private @Wither String rel;
|
|
private @Wither String href;
|
|
private @Wither String hreflang;
|
|
private @Wither String media;
|
|
private @Wither String title;
|
|
private @Wither String type;
|
|
private @Wither String deprecation;
|
|
private @Wither String profile;
|
|
private @JsonIgnore UriTemplate template;
|
|
private @JsonIgnore List<Affordance> affordances;
|
|
|
|
/**
|
|
* Creates a new link to the given URI with the self rel.
|
|
*
|
|
* @see IanaLinkRelation#SELF
|
|
* @param href must not be {@literal null} or empty.
|
|
*/
|
|
public Link(String href) {
|
|
this(href, IanaLinkRelation.SELF.value());
|
|
}
|
|
|
|
/**
|
|
* Creates a new {@link Link} to the given URI with the given rel.
|
|
*
|
|
* @param href must not be {@literal null} or empty.
|
|
* @param rel must not be {@literal null} or empty.
|
|
*/
|
|
public Link(String href, String rel) {
|
|
this(new UriTemplate(href), rel);
|
|
}
|
|
|
|
/**
|
|
* Creates a new Link from the given {@link UriTemplate} and rel.
|
|
*
|
|
* @param template must not be {@literal null}.
|
|
* @param rel must not be {@literal null} or empty.
|
|
*/
|
|
public Link(UriTemplate template, String rel) {
|
|
|
|
Assert.notNull(template, "UriTemplate must not be null!");
|
|
Assert.hasText(rel, "Rel must not be null or empty!");
|
|
|
|
this.template = template;
|
|
this.href = template.toString();
|
|
this.rel = rel;
|
|
this.affordances = new ArrayList<>();
|
|
}
|
|
|
|
public Link(String href, String rel, List<Affordance> affordances) {
|
|
|
|
this(href, rel);
|
|
|
|
Assert.notNull(affordances, "affordances must not be null!");
|
|
|
|
this.affordances = affordances;
|
|
}
|
|
|
|
/**
|
|
* Empty constructor required by the marshalling framework.
|
|
*/
|
|
protected Link() {
|
|
this.affordances = new ArrayList<>();
|
|
}
|
|
|
|
/**
|
|
* Returns safe copy of {@link Affordance}s.
|
|
*
|
|
* @return
|
|
*/
|
|
public List<Affordance> getAffordances() {
|
|
return Collections.unmodifiableList(this.affordances);
|
|
}
|
|
|
|
/**
|
|
* Returns a {@link Link} pointing to the same URI but with the {@code self} relation.
|
|
*
|
|
* @return
|
|
*/
|
|
public Link withSelfRel() {
|
|
return withRel(IanaLinkRelation.SELF.value());
|
|
}
|
|
|
|
/**
|
|
* Create new {@link Link} with an additional {@link Affordance}.
|
|
*
|
|
* @param affordance must not be {@literal null}.
|
|
* @return
|
|
*/
|
|
public Link andAffordance(Affordance affordance) {
|
|
|
|
Assert.notNull(affordance, "Affordance must not be null!");
|
|
|
|
List<Affordance> newAffordances = new ArrayList<>();
|
|
newAffordances.addAll(this.affordances);
|
|
newAffordances.add(affordance);
|
|
|
|
return withAffordances(newAffordances);
|
|
}
|
|
|
|
/**
|
|
* Convenience method when chaining an existing {@link Link}.
|
|
*
|
|
* @param name
|
|
* @param httpMethod
|
|
* @param inputType
|
|
* @param queryMethodParameters
|
|
* @param outputType
|
|
* @return
|
|
*/
|
|
public Link andAffordance(String name, HttpMethod httpMethod, ResolvableType inputType, List<QueryParameter> queryMethodParameters, ResolvableType outputType) {
|
|
return andAffordance(new Affordance(name, this, httpMethod, inputType, queryMethodParameters, outputType));
|
|
}
|
|
|
|
/**
|
|
* Convenience method when chaining an existing {@link Link}. Defaults the name of the affordance to verb + classname, e.g.
|
|
* {@literal <httpMethod=HttpMethod.PUT, inputType=Employee>} produces {@literal <name=putEmployee>}.
|
|
*
|
|
* @param httpMethod
|
|
* @param inputType
|
|
* @param queryMethodParameters
|
|
* @param outputType
|
|
* @return
|
|
*/
|
|
public Link andAffordance(HttpMethod httpMethod, ResolvableType inputType, List<QueryParameter> queryMethodParameters, ResolvableType outputType) {
|
|
return andAffordance(httpMethod.toString().toLowerCase() + inputType.resolve().getSimpleName(), httpMethod, inputType, queryMethodParameters, outputType);
|
|
}
|
|
|
|
/**
|
|
* Convenience method when chaining an existing {@link Link}. Defaults the name of the affordance to verb + classname, e.g.
|
|
* {@literal <httpMethod=HttpMethod.PUT, inputType=Employee>} produces {@literal <name=putEmployee>}.
|
|
*
|
|
* @param httpMethod
|
|
* @param inputType
|
|
* @param queryMethodParameters
|
|
* @param outputType
|
|
* @return
|
|
*/
|
|
public Link andAffordance(HttpMethod httpMethod, Class<?> inputType, List<QueryParameter> queryMethodParameters, Class<?> outputType) {
|
|
return andAffordance(httpMethod, ResolvableType.forClass(inputType), queryMethodParameters, ResolvableType.forClass(outputType));
|
|
}
|
|
|
|
/**
|
|
* Create new {@link Link} with additional {@link Affordance}s.
|
|
*
|
|
* @param affordances must not be {@literal null}.
|
|
* @return
|
|
*/
|
|
public Link andAffordances(List<Affordance> affordances) {
|
|
|
|
List<Affordance> newAffordances = new ArrayList<>();
|
|
newAffordances.addAll(this.affordances);
|
|
newAffordances.addAll(affordances);
|
|
|
|
return withAffordances(newAffordances);
|
|
}
|
|
|
|
/**
|
|
* Creats a new {@link Link} with the given {@link Affordance}s.
|
|
*
|
|
* @param affordances must not be {@literal null}.
|
|
* @return
|
|
*/
|
|
public Link withAffordances(List<Affordance> affordances) {
|
|
|
|
return new Link(this.rel, this.href, this.hreflang, this.media, this.title, this.type, this.deprecation,
|
|
this.profile, this.template, affordances);
|
|
}
|
|
|
|
/**
|
|
* Returns the variable names contained in the template.
|
|
*
|
|
* @return
|
|
*/
|
|
@JsonIgnore
|
|
public List<String> getVariableNames() {
|
|
return getUriTemplate().getVariableNames();
|
|
}
|
|
|
|
/**
|
|
* Returns all {@link TemplateVariables} contained in the {@link Link}.
|
|
*
|
|
* @return
|
|
*/
|
|
@JsonIgnore
|
|
public List<TemplateVariable> getVariables() {
|
|
return getUriTemplate().getVariables();
|
|
}
|
|
|
|
/**
|
|
* Returns whether or not the link is templated.
|
|
*
|
|
* @return
|
|
*/
|
|
public boolean isTemplated() {
|
|
return !getUriTemplate().getVariables().isEmpty();
|
|
}
|
|
|
|
/**
|
|
* Turns the current template into a {@link Link} by expanding it using the given parameters.
|
|
*
|
|
* @param arguments
|
|
* @return
|
|
*/
|
|
public Link expand(Object... arguments) {
|
|
return new Link(getUriTemplate().expand(arguments).toString(), getRel());
|
|
}
|
|
|
|
/**
|
|
* Turns the current template into a {@link Link} by expanding it using the given parameters.
|
|
*
|
|
* @param arguments must not be {@literal null}.
|
|
* @return
|
|
*/
|
|
public Link expand(Map<String, ? extends Object> arguments) {
|
|
return new Link(getUriTemplate().expand(arguments).toString(), getRel());
|
|
}
|
|
|
|
/**
|
|
* Returns whether the current {@link Link} has the given link relation.
|
|
*
|
|
* @param rel must not be {@literal null} or empty.
|
|
* @return
|
|
*/
|
|
public boolean hasRel(String rel) {
|
|
|
|
Assert.hasText(rel, "Link relation must not be null or empty!");
|
|
|
|
return this.rel.equals(rel);
|
|
}
|
|
|
|
private UriTemplate getUriTemplate() {
|
|
|
|
if (template == null) {
|
|
this.template = new UriTemplate(href);
|
|
}
|
|
|
|
return template;
|
|
}
|
|
|
|
/*
|
|
* (non-Javadoc)
|
|
* @see java.lang.Object#toString()
|
|
*/
|
|
@Override
|
|
public String toString() {
|
|
|
|
String linkString = String.format("<%s>;rel=\"%s\"", href, rel);
|
|
|
|
if (hreflang != null) {
|
|
linkString += ";hreflang=\"" + hreflang + "\"";
|
|
}
|
|
|
|
if (media != null) {
|
|
linkString += ";media=\"" + media + "\"";
|
|
}
|
|
|
|
if (title != null) {
|
|
linkString += ";title=\"" + title + "\"";
|
|
}
|
|
|
|
if (type != null) {
|
|
linkString += ";type=\"" + type + "\"";
|
|
}
|
|
|
|
if (deprecation != null) {
|
|
linkString += ";deprecation=\"" + deprecation + "\"";
|
|
}
|
|
|
|
if (profile != null) {
|
|
linkString += ";profile=\"" + profile + "\"";
|
|
}
|
|
|
|
return linkString;
|
|
}
|
|
|
|
/**
|
|
* Factory method to easily create {@link Link} instances from RFC-5988 compatible {@link String} representations of a
|
|
* link. Will return {@literal null} if input {@link String} is either empty or {@literal null}.
|
|
*
|
|
* @param element an RFC-5899 compatible representation of a link.
|
|
* @throws IllegalArgumentException if a non-empty {@link String} was given that does not adhere to RFC-5899.
|
|
* @throws IllegalArgumentException if no {@code rel} attribute could be found.
|
|
* @return
|
|
*/
|
|
public static Link valueOf(String element) {
|
|
|
|
if (!StringUtils.hasText(element)) {
|
|
return null;
|
|
}
|
|
|
|
Matcher matcher = URI_AND_ATTRIBUTES_PATTERN.matcher(element);
|
|
|
|
if (matcher.find()) {
|
|
|
|
Map<String, String> attributes = getAttributeMap(matcher.group(2));
|
|
|
|
if (!attributes.containsKey("rel")) {
|
|
throw new IllegalArgumentException("Link does not provide a rel attribute!");
|
|
}
|
|
|
|
Link link = new Link(matcher.group(1), attributes.get("rel"));
|
|
|
|
if (attributes.containsKey("hreflang")) {
|
|
link = link.withHreflang(attributes.get("hreflang"));
|
|
}
|
|
|
|
if (attributes.containsKey("media")) {
|
|
link = link.withMedia(attributes.get("media"));
|
|
}
|
|
|
|
if (attributes.containsKey("title")) {
|
|
link = link.withTitle(attributes.get("title"));
|
|
}
|
|
|
|
if (attributes.containsKey("type")) {
|
|
link = link.withType(attributes.get("type"));
|
|
}
|
|
|
|
if (attributes.containsKey("deprecation")) {
|
|
link = link.withDeprecation(attributes.get("deprecation"));
|
|
}
|
|
|
|
if (attributes.containsKey("profile")) {
|
|
link = link.withProfile(attributes.get("profile"));
|
|
}
|
|
|
|
return link;
|
|
|
|
} else {
|
|
throw new IllegalArgumentException(String.format("Given link header %s is not RFC5988 compliant!", element));
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Parses the links attributes from the given source {@link String}.
|
|
*
|
|
* @param source
|
|
* @return
|
|
*/
|
|
private static Map<String, String> getAttributeMap(String source) {
|
|
|
|
if (!StringUtils.hasText(source)) {
|
|
return Collections.emptyMap();
|
|
}
|
|
|
|
Map<String, String> attributes = new HashMap<>();
|
|
Matcher matcher = KEY_AND_VALUE_PATTERN.matcher(source);
|
|
|
|
while (matcher.find()) {
|
|
attributes.put(matcher.group(1), matcher.group(2));
|
|
}
|
|
|
|
return attributes;
|
|
}
|
|
}
|