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Mockito mock objects library core API and implementation

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/*
 * Copyright (c) 2016 Mockito contributors
 * This program is made available under the terms of the MIT License.
 */
package org.mockito.exceptions.stacktrace;

/**
 * Decides if particular StackTraceElement is excluded from the human-readable stack trace output.
 * Mockito stack trace filtering mechanism uses this information.
 * 
 * Excluding an element will make it not show in the cleaned stack trace.
 * Not-excluding an element does not guarantee it will be shown (e.g. it depends on the implementation of
 * {@linkplain org.mockito.internal.exceptions.stacktrace.StackTraceFilter Mockito internal cleaner}).
 * 

 * The implementations are required to be thread safe ; for example, make them stateless.
 * 
 * See also the {@linkplain org.mockito.internal.exceptions.stacktrace.DefaultStackTraceCleaner Mockito default implementation}
 */
public interface StackTraceCleaner {

    /**
     * Decides if element is included.
     *
     * @param candidate element of the actual stack trace
     * @return whether the element should be excluded from cleaned stack trace.
     */
    boolean isIn(StackTraceElement candidate);

    /**
     * It's recommended to override this method in subclasses to avoid potentially costly re-boxing operations.
     */
    default boolean isIn(StackFrameMetadata candidate) {
        return isIn(
                new StackTraceElement(
                        candidate.getClassName(),
                        candidate.getMethodName(),
                        candidate.getFileName(),
                        candidate.getLineNumber()));
    }

    /**
     * Very similar to the StackFrame class declared on the StackWalker api.
     */
    interface StackFrameMetadata {
        String getClassName();

        String getMethodName();

        String getFileName();

        int getLineNumber();
    }
}