com.sun.jersey.api.client.filter.Filterable Maven / Gradle / Ivy
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package com.sun.jersey.api.client.filter;
import com.sun.jersey.api.client.ClientHandler;
/**
* An abstract class providing support for registering and managing a chain of {@link ClientFilter} instances.
*
* A {@link ClientFilter} instance MUST be occur at most once in any {@link Filterable} instance,
* otherwise unexpected results may occur. If it is necessary to add the same type of {@link ClientFilter} more than once to
* the same {@link Filterable} instance or to more than one {@link Filterable} instance then a new instance of that {@link
* ClientFilter} MUST be added.
*
* @author Paul Sandoz
*/
public abstract class Filterable {
private final ClientHandler root;
private ClientHandler head;
/**
* Construct with a root client handler.
*
* @param root the root handler to handle the request and return a response.
*/
protected Filterable(ClientHandler root) {
this.root = this.head = root;
}
/**
* Construct from an existing filterable instance.
*
* @param that the filter to copy.
*/
protected Filterable(Filterable that) {
this.root = that.root;
this.head = that.head;
}
/**
* Add a filter to the filter chain.
*
* @param f the filter to add.
*/
public void addFilter(ClientFilter f) {
f.setNext(head);
this.head = f;
}
/**
* Remove a filter from the chain.
*
* @param f the filter to remove.
*/
public void removeFilter(ClientFilter f) {
// No filters added
if (head == root) {
return;
}
// Filter is at the head
if (head == f) {
head = f.getNext();
return;
}
ClientFilter e = (ClientFilter) head;
while (e.getNext() != f) {
if (e.getNext() == root) {
return;
}
e = (ClientFilter) e.getNext();
}
e.setNext(f.getNext());
}
/**
* Check if a filter is present in the chain.
*
* @param filter the filter to remove.
* @return return {@code true} if the filter is present, otherwise {@code false}.
* @deprecated use {@link #isFilterPresent(ClientFilter)} instead.
*/
@Deprecated
public boolean isFilterPreset(final ClientFilter filter) {
return isFilterPresent(filter);
}
/**
* Check if a filter is present in the chain.
*
* @param filter the filter to remove.
* @return return {@code true} if the filter is present, otherwise {@code false}.
*/
public boolean isFilterPresent(final ClientFilter filter) {
if (head == root) {
return false;
}
if (head == filter) {
return true;
}
ClientFilter e = (ClientFilter) head;
while (e.getNext() != filter) {
if (e.getNext() == root) {
return false;
}
e = (ClientFilter) e.getNext();
}
return true;
}
/**
* Remove all filters from the filter chain.
*/
public void removeAllFilters() {
this.head = root;
}
/**
* Get the head client handler of the filter chain.
*
* @return the head client handler of the filter chain.
*/
public ClientHandler getHeadHandler() {
return head;
}
}