All Downloads are FREE. Search and download functionalities are using the official Maven repository.

ix.internal.operators.DoOnEachIterable Maven / Gradle / Ivy

There is a newer version: 1.0.0
Show newest version
/*
 * Copyright 2011-2016 David Karnok
 *
 * 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 ix.internal.operators;

import ix.internal.util.SingleContainer;

import java.util.Iterator;
import java.util.NoSuchElementException;

import rx.Notification;
import rx.functions.Action0;
import rx.functions.Action1;

public final class DoOnEachIterable implements Iterable {
	private final Action1 error;
	private final Action0 finish;
	/** The source sequence. */
	private final Iterable source;

	public DoOnEachIterable(Action1 error,
			Action0 finish, Iterable source) {
		this.error = error;
		this.finish = finish;
		this.source = source;
	}

	@Override
	public Iterator iterator() {
	    return new Iterator() {
	        /** The iterator. */
	        final Iterator it = source.iterator();
	        /** The peek ahead container. */
	        final SingleContainer> peek = new SingleContainer>();
	        /** Finish or error once. */
	        boolean once = true;
	        @Override
	        public boolean hasNext() {
	            if (peek.isEmpty()) {
	                try {
	                    if (it.hasNext()) {
	                        peek.add(Interactive.some(it.next()));
	                    } else {
	                        if (once) {
	                            once = false;
	                            finish.call();
	                        }
	                    }
	                } catch (Throwable t) {
	                    peek.add(Interactive.err(t));
	                }
	            }
	            return !peek.isEmpty();
	        }
	        
	        @Override
	        public T next() {
	            if (it.hasNext()) {
	                Notification o = peek.take();
	                if (o.isOnError() && once) {
	                    once = false;
	                    error.call(o.getThrowable());
	                }
	                return Interactive.value(o);
	            }
	            throw new NoSuchElementException();
	        }
	        
	        @Override
	        public void remove() {
	            it.remove();
	        }
	    };
	}
}




© 2015 - 2025 Weber Informatics LLC | Privacy Policy