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/*
* Copyright 2013, The gwtquery team.
*
* 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 com.google.gwt.query.client.plugins.deferred;
import static com.google.gwt.query.client.Promise.PENDING;
import static com.google.gwt.query.client.Promise.REJECTED;
import static com.google.gwt.query.client.Promise.RESOLVED;
import com.google.gwt.query.client.Function;
import com.google.gwt.query.client.GQuery;
import com.google.gwt.query.client.Promise;
/**
* Implementation of jQuery.Deferred for gwtquery.
*/
public class Deferred implements Promise.Deferred {
/**
* Implementation of the Promise interface which is used internally by
* Deferred.
*/
public static class DeferredPromiseImpl implements Promise {
// Using 'int' instead of 'enum' because we use them as indexes as well
private static final int DONE = 0, FAIL = 1, PROGRESS = 2;
// Private class used to handle `Promise.then()`
private static class ThenFunction extends Function {
// Original filter function
private final Function filter;
// Type of action (DONE/FAIL/PROGRESS)
private final int type;
// Original deferred object
private final Deferred dfd;
// Whether break the flow if old deferred fails
boolean cont = false;
public ThenFunction(Deferred newDfd, Function[] subordinates, int funcType,
boolean continueFlow) {
type = funcType;
filter = subordinates.length > type ? subordinates[type] : null;
dfd = newDfd;
cont = continueFlow;
}
public void f() {
final Object[] oldArgs = getArguments();
if (filter != null) {
// We filter resolved arguments with the filter function
Object newArgs = filter.setArguments(oldArgs).f(oldArgs);
if (newArgs instanceof Promise) {
// If filter function returns a promise we pipeline it.
final Promise p = (Promise) newArgs;
if (type == PROGRESS) {
p.progress(new Function() {
public void f() {
settle(PROGRESS, getArguments());
}
});
} else {
p.always(new Function() {
public void f() {
settle((type == DONE || type == FAIL && cont) && p.isResolved() ? DONE : FAIL,
getArguments());
}
});
}
} else {
// Otherwise we change the arguments by the new ones
newArgs = Boolean.TRUE.equals(newArgs) ? oldArgs :
newArgs != null && newArgs.getClass().isArray() ? (Object[]) newArgs : newArgs;
settle(type, newArgs);
}
} else {
// just continue the flow when filter is null
settle(type, oldArgs);
}
}
private void settle(int action, Object... args) {
if (action == DONE)
dfd.resolve(args);
if (action == FAIL)
dfd.reject(args);
if (action == PROGRESS)
dfd.notify(args);
}
}
protected com.google.gwt.query.client.plugins.deferred.Deferred dfd;
/**
* Utility function which can be used inside classes extending this to
* resolve this deferred in a call to any other promise method.
*
* Example:
*
* new PromiseFunction() {
* public void f(final Deferred dfd) {
* anotherPromise.done( resolve );
* }
* }
*
*/
public Function resolve = new Function() {
public void f() {
dfd.resolve(arguments);
};
};
/**
* Utility function which can be used inside classes extending this to
* reject this deferred in a call to any other promise method.
*
* Example:
*
* new PromiseFunction() {
* public void f(final Deferred dfd) {
* anotherPromise.done( reject );
* }
* }
*
*/
public Function reject = new Function() {
public void f() {
dfd.reject(arguments);
};
};
protected DeferredPromiseImpl() {
dfd = new com.google.gwt.query.client.plugins.deferred.Deferred();
}
protected DeferredPromiseImpl(
com.google.gwt.query.client.plugins.deferred.Deferred o) {
dfd = o;
}
public Promise always(Function... f) {
return done(f).fail(f);
}
public Promise and(Function f) {
return then(f);
}
public Promise done(Function... f) {
dfd.resolve.add(f);
return this;
}
public Promise fail(Function... f) {
dfd.reject.add(f);
return this;
}
public Promise or(final Function f) {
return then(true, null, f);
}
public Promise pipe(Function... f) {
return then(f);
}
public Promise progress(Function... f) {
dfd.notify.add(f);
return this;
}
public String state() {
return dfd.state;
}
private Promise then(boolean continueFlow, final Function... f) {
final Deferred newDfd = new com.google.gwt.query.client.plugins.deferred.Deferred();
done(new ThenFunction(newDfd, f, DONE, continueFlow));
fail(new ThenFunction(newDfd, f, FAIL, continueFlow));
progress(new ThenFunction(newDfd, f, PROGRESS, continueFlow));
return newDfd.promise();
}
public Promise then(final Function... f) {
return then(false, f);
}
public boolean isResolved() {
return Promise.RESOLVED.equals(state());
}
public boolean isRejected() {
return Promise.REJECTED.equals(state());
}
public boolean isPending() {
return Promise.PENDING.equals(state());
}
public String toString() {
return "Promise this=" + hashCode() + " " + dfd;
}
}
/**
* Internal Deferred class used to combine a set of subordinate promises.
*/
private static class WhenDeferredImpl extends Deferred {
/**
* Internal function used to track whether all deferred subordinates are
* resolved.
*/
private class DoneFnc extends Function {
final int idx;
public DoneFnc(int i, Deferred d) {
idx = i;
}
public Object f(Object... args) {
values[idx] = args.length == 1 ? args[0] : args;
if (--remaining == 0) {
WhenDeferredImpl.this.resolve(values);
}
return true;
}
}
private Function failFnc = new Function() {
public Object f(Object... o) {
WhenDeferredImpl.this.reject(o);
return true;
}
};
private Function progressFnc = new Function() {
public Object f(Object... o) {
WhenDeferredImpl.this.notify(o);
return true;
}
};
// Remaining counter
private int remaining;
// An indexed array with the fired values of all subordinated
private final Object[] values;
public WhenDeferredImpl(Promise[] sub) {
int l = remaining = sub.length;
values = new Object[l];
for (int i = 0; i < l; i++) {
sub[i].done(new DoneFnc(i, this)).progress(progressFnc).fail(failFnc);
}
}
}
/**
* Provides a way to execute callback functions based on one or more objects,
* usually Deferred objects that represent asynchronous events.
*
* Returns the Promise from a new "master" Deferred object that tracks the aggregate
* state of all the Deferreds passed. The method will resolve its master
* Deferred as soon as all the Deferreds resolve, or reject the master Deferred as
* soon as one of the Deferreds is rejected
*/
public static Promise when(Object... d) {
int l = d.length;
Promise[] p = new Promise[l];
for (int i = 0; i < l; i++) {
p[i] = makePromise(d[i]);
}
return when(p);
}
private static Promise makePromise(final Object o) {
if (o instanceof Promise) {
return (Promise) o;
} else if (o instanceof Function) {
return makePromise(((Function) o).f(new Object[0]));
} else if (o instanceof GQuery) {
return ((GQuery) o).promise();
} else {
return new PromiseFunction() {
public void f(Deferred dfd) {
dfd.resolve(o);
}
};
}
}
public static Promise when(Promise... d) {
final int n = d.length;
switch (n) {
case 1:
return d[0];
case 0:
return new Deferred().resolve().promise();
default:
return new WhenDeferredImpl(d).promise();
}
}
private Callbacks notify = new Callbacks("memory");
private Promise promise = null;
private Callbacks reject = new Callbacks("once memory");
private Callbacks resolve = new Callbacks("once memory");
private String state = PENDING;
public Deferred() {
resolve.add(new Function() {
public void f() {
state = RESOLVED;
resolve.disable();
notify.lock();
}
});
reject.add(new Function() {
public void f() {
state = REJECTED;
reject.disable();
notify.lock();
}
});
}
/**
* Call the progressCallbacks on a Deferred object with the given args.
*/
public Deferred notify(Object... o) {
if (state == PENDING)
notify.fire(o);
return this;
}
/**
* Return a Deferred’s Promise object.
*/
public Promise promise() {
if (promise == null) {
promise = new DeferredPromiseImpl(this);
}
return promise;
}
/**
* Reject a Deferred object and call any failCallbacks with the given args.
*/
public Deferred reject(Object... o) {
if (state == PENDING)
reject.fire(o);
return this;
}
/**
* Resolve a Deferred object and call any doneCallbacks with the given args.
*/
public Deferred resolve(Object... o) {
if (state == PENDING)
resolve.fire(o);
return this;
}
@Override
public String toString() {
return "Deferred this=" + hashCode() + " promise=" + promise().hashCode() + " state="
+ promise.state() + " restatus=" + resolve.status();
}
}
