org.dmfs.jems.hamcrest.matchers.CharSequenceCharAtMatcher Maven / Gradle / Ivy
/*
* Copyright 2017 dmfs GmbH
*
*
* 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 org.dmfs.jems.hamcrest.matchers;
import org.hamcrest.Description;
import org.hamcrest.Matcher;
import org.hamcrest.TypeSafeDiagnosingMatcher;
import java.util.Locale;
/**
* A {@link Matcher} which checks that {@code charAt} of a {@link CharSequence} returns expected values.
*
* @author Marten Gajda
*/
public final class CharSequenceCharAtMatcher extends TypeSafeDiagnosingMatcher
{
private final CharSequence mExpectedValue;
/**
* Returns a {@link Matcher} to check the {@code charAt} method of a {@link CharSequence} by comparing it to a String.
*
* @param expectedValues
* A {@link String} which contains the expected characters.
*
* @return A {@link CharSequenceCharAtMatcher}.
*/
public static CharSequenceCharAtMatcher hasChars(CharSequence expectedValues)
{
return new CharSequenceCharAtMatcher(expectedValues);
}
public CharSequenceCharAtMatcher(CharSequence expectedValue)
{
mExpectedValue = expectedValue;
}
@Override
protected boolean matchesSafely(CharSequence item, Description mismatchDescription)
{
for (int i = -mExpectedValue.length() - 1; i < mExpectedValue.length() * 2 + 1; ++i)
{
if (i < 0 || i >= mExpectedValue.length())
{
try
{
item.charAt(i);
mismatchDescription.appendText(String.format(Locale.ENGLISH, "Did not throw when accessing index %d", i));
return false;
}
catch (ArrayIndexOutOfBoundsException | StringIndexOutOfBoundsException e)
{
// pass
}
}
else if (item.charAt(i) != mExpectedValue.charAt(i))
{
mismatchDescription.appendText(String.format(Locale.ENGLISH, "char at %d was '%c'", i, item.charAt(i)));
return false;
}
}
return true;
}
@Override
public void describeTo(Description description)
{
description.appendText("chars match \"").appendText(mExpectedValue.toString()).appendText("\"");
}
}