/*
 * Copyright 2000-2016 JetBrains s.r.o.
 *
 * 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.intellij.util;

import com.intellij.openapi.progress.ProgressManager;
import org.jetbrains.annotations.NotNull;

import java.util.Collection;

public class Processors {
  @NotNull
  public static <T> Processor<T> cancelableCollectProcessor(@NotNull Collection<T> collection) {
    return new CommonProcessors.CollectProcessor<T>(collection){
      @Override
      public boolean process(T t) {
        ProgressManager.checkCanceled();
        return super.process(t);
      }
    };
  }
}

/*
 * Copyright 2000-2016 JetBrains s.r.o.
 *
 * 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.intellij.util;

import com.intellij.openapi.progress.ProgressManager;
import com.intellij.openapi.util.Condition;
import org.jetbrains.annotations.NotNull;

import java.util.Collection;

public class Processors {
  @NotNull
  public static <T> Processor<T> filter(@NotNull Processor<? super T> processor,
                                        @NotNull Condition<? super T> filter) {
    return o -> !filter.value(o) || processor.process(o);
  }

  @NotNull
  public static <T, S> Processor<S> map(@NotNull Processor<T> processor,
                                        @NotNull Function<? super S, ? extends T> map) {
    return o -> processor.process(map.fun(o));
  }

  @NotNull
  public static <T> Processor<T> cancelableCollectProcessor(@NotNull Collection<T> collection) {
    return new CommonProcessors.CollectProcessor<T>(collection){
      @Override
      public boolean process(T t) {
        ProgressManager.checkCanceled();
        return super.process(t);
      }
    };
  }
}

introduce map() and filter()