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Java API for RESTful Web Services
/*
* Copyright (c) 2010, 2017 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 javax.ws.rs.core;
import javax.ws.rs.ext.RuntimeDelegate;
import javax.ws.rs.ext.RuntimeDelegate.HeaderDelegate;
/**
* An abstraction for the value of a HTTP Entity Tag, used as the value
* of an ETag response header.
*
* @author Paul Sandoz
* @author Marc Hadley
* @see HTTP/1.1 section 3.11
* @since 1.0
*/
public class EntityTag {
private static final HeaderDelegate HEADER_DELEGATE =
RuntimeDelegate.getInstance().createHeaderDelegate(EntityTag.class);
private String value;
private boolean weak;
/**
* Creates a new instance of a strong {@code EntityTag}.
*
* @param value the value of the tag, quotes not included.
* @throws IllegalArgumentException if value is {@code null}.
*/
public EntityTag(final String value) {
this(value, false);
}
/**
* Creates a new instance of an {@code EntityTag}.
*
* @param value the value of the tag, quotes not included.
* @param weak {@code true} if this represents a weak tag, {@code false} otherwise.
* @throws IllegalArgumentException if value is {@code null}.
*/
public EntityTag(final String value, final boolean weak) {
if (value == null) {
throw new IllegalArgumentException("value==null");
}
this.value = value;
this.weak = weak;
}
/**
* Creates a new instance of {@code EntityTag} by parsing the supplied string.
*
* @param value the entity tag string.
* @return the newly created entity tag.
* @throws IllegalArgumentException if the supplied string cannot be parsed
* or is {@code null}.
*/
public static EntityTag valueOf(final String value) {
return HEADER_DELEGATE.fromString(value);
}
/**
* Check the strength of an {@code EntityTag}.
*
* @return {@code true} if this represents a weak tag, {@code false} otherwise.
*/
public boolean isWeak() {
return weak;
}
/**
* Get the value of an {@code EntityTag}.
*
* @return the value of the tag.
*/
public String getValue() {
return value;
}
/**
* Compares {@code obj} to this tag to see if they are the same considering
* weakness and value.
*
* @param obj the object to compare to.
* @return {@code true} if the two tags are the same, {@code false} otherwise.
*/
@Override
public boolean equals(final Object obj) {
if (obj == null) {
return false;
}
if (!(obj instanceof EntityTag)) {
return super.equals(obj);
}
EntityTag other = (EntityTag) obj;
if (value.equals(other.getValue()) && weak == other.isWeak()) {
return true;
}
return false;
}
/**
* Generate hashCode based on value and weakness.
*
* @return the entity tag hash code.
*/
@Override
public int hashCode() {
int hash = 3;
hash = 17 * hash + (this.value != null ? this.value.hashCode() : 0);
hash = 17 * hash + (this.weak ? 1 : 0);
return hash;
}
/**
* Convert the entity tag to a string suitable for use as the value of the
* corresponding HTTP header.
*
* @return a string version of the entity tag.
*/
@Override
public String toString() {
return HEADER_DELEGATE.toString(this);
}
}