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/*
* Copyright (C) 2009 The Guava Authors
*
* 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.common.io;
import com.google.common.annotations.GwtIncompatible;
import com.google.common.annotations.J2ktIncompatible;
import com.google.errorprone.annotations.CanIgnoreReturnValue;
import java.io.IOException;
import org.checkerframework.checker.nullness.qual.Nullable;
/**
* A callback to be used with the streaming {@code readLines} methods.
*
* <p>{@link #processLine} will be called for each line that is read, and should return {@code
* false} when you want to stop processing.
*
* @author Miles Barr
* @since 1.0
*/
@J2ktIncompatible
@GwtIncompatible
@ElementTypesAreNonnullByDefault
public interface LineProcessor<T extends @Nullable Object> {
/**
* This method will be called once for each line.
*
* @param line the line read from the input, without delimiter
* @return true to continue processing, false to stop
*/
@CanIgnoreReturnValue // some uses know that their processor never returns false
boolean processLine(String line) throws IOException;
/** Return the result of processing all the lines. */
@ParametricNullness
T getResult();
}
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