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| import android.arch.lifecycle.Observer; | |
| import android.support.annotation.Nullable; | |
| public abstract class IgnorantObserver<T> implements Observer<T>{ | |
| private boolean isIgnoring = false; | |
| private boolean doingIgnorantly = false; | |
| public IgnorantObserver(){ | |
| this(false); | |
| } | |
| public IgnorantObserver(boolean isIgnoring){ | |
| this.isIgnoring = isIgnoring; | |
| } | |
| @Override | |
| public final void onChanged(@Nullable T t) { | |
| if((!isIgnoring)&&(!doingIgnorantly)) ignorantOnChanged(t); | |
| } | |
| public final void ignore(boolean ignore){ | |
| isIgnoring = ignore; | |
| } | |
| /** | |
| * returns false when executing doIgnorantly even if underling value is true | |
| * use isUnderlyingIgnoring() instead for that | |
| */ | |
| public final boolean isIgnoring(){ | |
| return isIgnoring && !doingIgnorantly; | |
| } | |
| public final boolean isUnderlingIgnoring(){ | |
| return isIgnoring; | |
| } | |
| /** | |
| * execute and ignore all onChanged events for this observer while running | |
| * calls to ignore will not take effect until this returns | |
| */ | |
| public final void doIgnorantly(Function f){ | |
| boolean isNestedDoIgnorantly = doingIgnorantly; | |
| doingIgnorantly = true; | |
| f.run(); | |
| doingIgnorantly = isNestedDoIgnorantly; | |
| } | |
| public interface Function{ public void run();} | |
| /** | |
| * called by onChanged only when not ignoring | |
| */ | |
| protected abstract void ignorantOnChanged(@Nullable T t); | |
| } |
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userObserver.doIgnorantly(() -> { session.updateUserName("bob"); });