package org.junit.internal;

import java.util.ArrayList;

import java.util.List;

import org.junit.Assert;

/**

 * Thrown when two array elements differ

 * @see Assert#assertEquals(String, Object[], Object[])

 */

public class ArrayComparisonFailure extends AssertionError {

	private static final long serialVersionUID= 1L;

	private List<Integer> fIndices= new ArrayList<Integer>();

	private final String fMessage;

	private final AssertionError fCause;

	/**

	 * Construct a new <code>ArrayComparisonFailure</code> with an error text and the array's

	 * dimension that was not equal

	 * @param cause the exception that caused the array's content to fail the assertion test 

	 * @param index the array position of the objects that are not equal.

	 * @see Assert#assertEquals(String, Object[], Object[])

	 */

	public ArrayComparisonFailure(String message, AssertionError cause, int index) {

		fMessage= message;

		fCause= cause;

		addDimension(index);

	}

	public void addDimension(int index) {

		fIndices.add(0, index);

	}

	@Override

	public String getMessage() {

		StringBuilder builder= new StringBuilder();

		if (fMessage != null)

			builder.append(fMessage);

		builder.append("arrays first differed at element ");

		for (int each : fIndices) {

			builder.append("[");

			builder.append(each);

			builder.append("]");

		}

		builder.append("; ");

		builder.append(fCause.getMessage());

		return builder.toString();

	}

	/**

	 * {@inheritDoc}

	 */

	@Override public String toString() {

		return getMessage();

	}

}