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With inspiration from other libraries

There is a newer version: 2.12.15

package org.hamcrest.core;

import org.hamcrest.Description;
import org.hamcrest.TypeSafeMatcher;

public abstract class SubstringMatcher extends TypeSafeMatcher {

    // TODO: Replace String with CharSequence to allow for easy interopability between
    //       String, StringBuffer, StringBuilder, CharBuffer, etc (joe).

    protected final String substring;

    protected SubstringMatcher(final String substring) {
        this.substring = substring;
    }

    @Override
    public boolean matchesSafely(String item) {
        return evalSubstringOf(item);
    }
    @Override
    public void describeMismatchSafely(String item, Description mismatchDescription) {
      mismatchDescription.appendText("was \"").appendText(item).appendText("\"");
    }
    
    @Override
    public void describeTo(Description description) {
        description.appendText("a string ")
                .appendText(relationship())
                .appendText(" ")
                .appendValue(substring);
    }

    protected abstract boolean evalSubstringOf(String string);

    protected abstract String relationship();
}