// Path: mug/src/main/java/com/google/mu/util/stream/Iteration.java
// @FunctionalInterface
// public interface Continuation {
//   /** Runs the continuation. It will be called at most once throughout the stream. */
//   void run();
// }


import static java.util.Objects.requireNonNull;
import java.util.AbstractMap;
import java.util.Map;
import com.google.mu.util.stream.Iteration.Continuation;
/*****************************************************************************
 * ------------------------------------------------------------------------- *
 * 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.mu.util.stream;




/**
 * Similar to {@link Iteration}, but is used to iteratively {@link #yield yield()} pairs into a
 * lazy {@link BiStream}.
 */
public class BiIteration<L, R> {
  private final Iteration<Map.Entry<L, R>> iteration = new Iteration<>();

  /** Yields the pair of {@code left} and {@code right} to the result {@code BiStream}. */
  public final BiIteration<L, R> yield(L left, R right) {
    iteration.yield(
        new AbstractMap.SimpleImmutableEntry<>(requireNonNull(left), requireNonNull(right)));
    return this;
  }

  /**
   * Yields to the result {@code BiStream} a recursive iteration or lazy side-effect wrapped in
   * {@code continuation}.
   */
// Path: mug/src/main/java/com/google/mu/util/stream/Iteration.java
// @FunctionalInterface
// public interface Continuation {
//   /** Runs the continuation. It will be called at most once throughout the stream. */
//   void run();
// }


// Path: mug/src/main/java/com/google/mu/util/stream/BiIteration.java
import static java.util.Objects.requireNonNull;
import java.util.AbstractMap;
import java.util.Map;
import com.google.mu.util.stream.Iteration.Continuation;

/*****************************************************************************
 * ------------------------------------------------------------------------- *
 * 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.mu.util.stream;




/**
 * Similar to {@link Iteration}, but is used to iteratively {@link #yield yield()} pairs into a
 * lazy {@link BiStream}.
 */
public class BiIteration<L, R> {
  private final Iteration<Map.Entry<L, R>> iteration = new Iteration<>();

  /** Yields the pair of {@code left} and {@code right} to the result {@code BiStream}. */
  public final BiIteration<L, R> yield(L left, R right) {
    iteration.yield(
        new AbstractMap.SimpleImmutableEntry<>(requireNonNull(left), requireNonNull(right)));
    return this;
  }

  /**
   * Yields to the result {@code BiStream} a recursive iteration or lazy side-effect wrapped in
   * {@code continuation}.
   */
  public final BiIteration<L, R> yield(Continuation continuation) {