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package javax.ws.rs.core;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.ws.rs.ext.RuntimeDelegate;
import javax.ws.rs.ext.RuntimeDelegate.HeaderDelegate;
/**
* An abstraction for the value of a HTTP Cache-Control response header.
*
* @author Paul Sandoz
* @author Marc Hadley
* @see HTTP/1.1 section 14.9
* @since 1.0
*/
public class CacheControl {
private static final HeaderDelegate HEADER_DELEGATE =
RuntimeDelegate.getInstance().createHeaderDelegate(CacheControl.class);
private List privateFields;
private List noCacheFields;
private Map cacheExtension;
private boolean privateFlag;
private boolean noCache;
private boolean noStore;
private boolean noTransform;
private boolean mustRevalidate;
private boolean proxyRevalidate;
private int maxAge = -1;
private int sMaxAge = -1;
/**
* Create a new instance of CacheControl. The new instance will have the
* following default settings:
*
*
*
private = false
*
noCache = false
*
noStore = false
*
noTransform = true
*
mustRevalidate = false
*
proxyRevalidate = false
*
An empty list of private fields
*
An empty list of no-cache fields
*
An empty map of cache extensions
*
*/
public CacheControl() {
privateFlag = false;
noCache = false;
noStore = false;
noTransform = true;
mustRevalidate = false;
proxyRevalidate = false;
}
/**
* Creates a new instance of CacheControl by parsing the supplied string.
*
* @param value the cache control string
* @return the newly created CacheControl
*
* @throws IllegalArgumentException if the supplied string cannot be parsed
* or is null
*/
public static CacheControl valueOf(final String value) {
return HEADER_DELEGATE.fromString(value);
}
/**
* Corresponds to the must-revalidate cache control directive.
*
* @return true if the must-revalidate cache control directive will be included in the
* response, false otherwise.
*
* @see HTTP/1.1 section 14.9.4
*/
public boolean isMustRevalidate() {
return mustRevalidate;
}
/**
* Corresponds to the must-revalidate cache control directive.
*
* @param mustRevalidate true if the must-revalidate cache control directive should be included in the
* response, false otherwise.
* @see HTTP/1.1 section 14.9.4
*/
public void setMustRevalidate(final boolean mustRevalidate) {
this.mustRevalidate = mustRevalidate;
}
/**
* Corresponds to the proxy-revalidate cache control directive.
*
* @return true if the proxy-revalidate cache control directive will be included in the
* response, false otherwise.
*
* @see HTTP/1.1 section 14.9.4
*/
public boolean isProxyRevalidate() {
return proxyRevalidate;
}
/**
* Corresponds to the must-revalidate cache control directive.
*
* @param proxyRevalidate true if the proxy-revalidate cache control directive should be included in the
* response, false otherwise.
* @see HTTP/1.1 section 14.9.4
*/
public void setProxyRevalidate(final boolean proxyRevalidate) {
this.proxyRevalidate = proxyRevalidate;
}
/**
* Corresponds to the max-age cache control directive.
*
* @return the value of the max-age cache control directive, -1 if the directive is disabled.
*
* @see HTTP/1.1 section 14.9.3
*/
public int getMaxAge() {
return maxAge;
}
/**
* Corresponds to the max-age cache control directive.
*
* @param maxAge the value of the max-age cache control directive, a value of -1 will disable the directive.
* @see HTTP/1.1 section 14.9.3
*/
public void setMaxAge(final int maxAge) {
this.maxAge = maxAge;
}
/**
* Corresponds to the s-maxage cache control directive.
*
* @return the value of the s-maxage cache control directive, -1 if the directive is disabled.
*
* @see HTTP/1.1 section 14.9.3
*/
public int getSMaxAge() {
return sMaxAge;
}
/**
* Corresponds to the s-maxage cache control directive.
*
* @param sMaxAge the value of the s-maxage cache control directive, a value of -1 will disable the directive.
* @see HTTP/1.1 section 14.9.3
*/
public void setSMaxAge(final int sMaxAge) {
this.sMaxAge = sMaxAge;
}
/**
* Corresponds to the value of the no-cache cache control directive.
*
* @return a mutable list of field-names that will form the value of the no-cache cache control directive.
* An empty list results in a bare no-cache directive.
*
* @see #isNoCache()
* @see #setNoCache(boolean)
* @see HTTP/1.1 section 14.9.1
*/
public List getNoCacheFields() {
if (noCacheFields == null) {
noCacheFields = new ArrayList();
}
return noCacheFields;
}
/**
* Corresponds to the no-cache cache control directive.
*
* @param noCache true if the no-cache cache control directive should be included in the
* response, false otherwise.
* @see #getNoCacheFields()
* @see HTTP/1.1 section 14.9.1
*/
public void setNoCache(final boolean noCache) {
this.noCache = noCache;
}
/**
* Corresponds to the no-cache cache control directive.
*
* @return true if the no-cache cache control directive will be included in the
* response, false otherwise.
*
* @see #getNoCacheFields()
* @see HTTP/1.1 section 14.9.1
*/
public boolean isNoCache() {
return noCache;
}
/**
* Corresponds to the private cache control directive.
*
* @return true if the private cache control directive will be included in the
* response, false otherwise.
*
* @see #getPrivateFields()
* @see HTTP/1.1 section 14.9.1
*/
public boolean isPrivate() {
return privateFlag;
}
/**
* Corresponds to the value of the private cache control directive.
*
* @return a mutable list of field-names that will form the value of the private cache control directive.
* An empty list results in a bare no-cache directive.
*
* @see #isPrivate()
* @see #setPrivate(boolean)
* @see HTTP/1.1 section 14.9.1
*/
public List getPrivateFields() {
if (privateFields == null) {
privateFields = new ArrayList();
}
return privateFields;
}
/**
* Corresponds to the private cache control directive.
*
* @param flag true if the private cache control directive should be included in the
* response, false otherwise.
* @see #getPrivateFields()
* @see HTTP/1.1 section 14.9.1
*/
public void setPrivate(final boolean flag) {
this.privateFlag = flag;
}
/**
* Corresponds to the no-transform cache control directive.
*
* @return true if the no-transform cache control directive will be included in the
* response, false otherwise.
*
* @see HTTP/1.1 section 14.9.5
*/
public boolean isNoTransform() {
return noTransform;
}
/**
* Corresponds to the no-transform cache control directive.
*
* @param noTransform true if the no-transform cache control directive should be included in the
* response, false otherwise.
* @see HTTP/1.1 section 14.9.5
*/
public void setNoTransform(final boolean noTransform) {
this.noTransform = noTransform;
}
/**
* Corresponds to the no-store cache control directive.
*
* @return true if the no-store cache control directive will be included in the
* response, false otherwise.
*
* @see HTTP/1.1 section 14.9.2
*/
public boolean isNoStore() {
return noStore;
}
/**
* Corresponds to the no-store cache control directive.
*
* @param noStore true if the no-store cache control directive should be included in the
* response, false otherwise.
* @see HTTP/1.1 section 14.9.2
*/
public void setNoStore(final boolean noStore) {
this.noStore = noStore;
}
/**
* Corresponds to a set of extension cache control directives.
*
* @return a mutable map of cache control extension names and their values.
* If a key has a null value, it will appear as a bare directive. If a key has
* a value that contains no whitespace then the directive will appear as
* a simple name=value pair. If a key has a value that contains whitespace
* then the directive will appear as a quoted name="value" pair.
*
* @see HTTP/1.1 section 14.9.6
*/
public Map getCacheExtension() {
if (cacheExtension == null) {
cacheExtension = new HashMap();
}
return cacheExtension;
}
/**
* Convert the cache control to a string suitable for use as the value of the
* corresponding HTTP header.
*
* @return a stringified cache control
*/
@Override
public String toString() {
return HEADER_DELEGATE.toString(this);
}
/**
* Generate hash code from cache control properties.
*
* @return the hashCode
*/
@Override
public int hashCode() {
int hash = 7;
hash = 41 * hash + (this.privateFlag ? 1 : 0);
hash = 41 * hash + (this.noCache ? 1 : 0);
hash = 41 * hash + (this.noStore ? 1 : 0);
hash = 41 * hash + (this.noTransform ? 1 : 0);
hash = 41 * hash + (this.mustRevalidate ? 1 : 0);
hash = 41 * hash + (this.proxyRevalidate ? 1 : 0);
hash = 41 * hash + this.maxAge;
hash = 41 * hash + this.sMaxAge;
hash = 41 * hash + hashCodeOf(this.privateFields);
hash = 41 * hash + hashCodeOf(this.noCacheFields);
hash = 41 * hash + hashCodeOf(this.cacheExtension);
return hash;
}
/**
* Compares object argument to this cache control to see if they are the same
* considering all property values.
*
* @param obj the object to compare to
* @return true if the two cache controls are the same, false otherwise.
*/
@Override
public boolean equals(final Object obj) {
if (obj == null) {
return false;
}
if (getClass() != obj.getClass()) {
return false;
}
final CacheControl other = (CacheControl) obj;
if (this.privateFlag != other.privateFlag) {
return false;
}
if (this.noCache != other.noCache) {
return false;
}
if (this.noStore != other.noStore) {
return false;
}
if (this.noTransform != other.noTransform) {
return false;
}
if (this.mustRevalidate != other.mustRevalidate) {
return false;
}
if (this.proxyRevalidate != other.proxyRevalidate) {
return false;
}
if (this.maxAge != other.maxAge) {
return false;
}
if (this.sMaxAge != other.sMaxAge) {
return false;
}
if (notEqual(this.privateFields, other.privateFields)) {
return false;
}
if (notEqual(this.noCacheFields, other.noCacheFields)) {
return false;
}
if (notEqual(this.cacheExtension, other.cacheExtension)) {
return false;
}
return true;
}
/**
* Check if two collections are not equal.
*
* If one of the collections is {@code null} and the other is empty, consider the collections to be equal.
*
* @param first first collection. May be {@code null}.
* @param second second collection. May be {@code null}.
* @return {@code true} if the two collections are not equal, {@code false} if the two collections are equal
* (or one of them is {@code null} and the other one is empty).
*/
private static boolean notEqual(Collection first, Collection second) {
if (first == second) {
return false;
}
if (first == null) {
// if first is 'null', consider equal to empty
return !second.isEmpty();
}
if (second == null) {
// if second is 'null', consider equal to empty
return !first.isEmpty();
}
return !first.equals(second);
}
/**
* Check if two maps are not equal.
*
* If one of the maps is {@code null} and the other is empty, consider the maps to be equal.
*
* @param first first collection. May be {@code null}.
* @param second second collection. May be {@code null}.
* @return {@code true} if the two maps are not equal, {@code false} if the two maps are equal
* (or one of them is {@code null} and the other one is empty).
*/
private static boolean notEqual(Map first, Map second) {
if (first == second) {
return false;
}
if (first == null) {
// if first is 'null', consider equal to empty
return !second.isEmpty();
}
if (second == null) {
// if second is 'null', consider equal to empty
return !first.isEmpty();
}
return !first.equals(second);
}
/**
* Compute a {@link Object#hashCode} of a collection.
*
* If the collection is {@code null} or empty, the returned hash code is {@code 0} (zero). Otherwise, the collection's
* {@code hashCode()} method is called to compute the hash code.
*
* @param instance collection, may be {@code null}.
* @return hash code for the collection, if {@code null} or empty, the returned hash code is {@code 0} (zero).
*/
private static int hashCodeOf(Collection instance) {
return (instance == null || instance.isEmpty()) ? 0 : instance.hashCode();
}
/**
* Compute a {@link Object#hashCode} of a map.
*
* If the map is {@code null} or empty, the returned hash code is {@code 0} (zero). Otherwise, the map's
* {@code hashCode()} method is called to compute the hash code.
*
* @param instance map, may be {@code null}.
* @return hash code for the map, if {@code null} or empty, the returned hash code is {@code 0} (zero).
*/
private static int hashCodeOf(Map instance) {
return (instance == null || instance.isEmpty()) ? 0 : instance.hashCode();
}
}
