import org.apache.wicket.request.Url.QueryParameter;
import org.apache.wicket.request.mapper.parameter.IPageParametersEncoder;
import org.apache.wicket.request.mapper.parameter.PageParameters;
import org.apache.wicket.util.lang.Args;
import org.apache.wicket.util.string.Strings;
<BUG>public abstract class AbstractMapper
{</BUG>
protected static String getPlaceholder(String s)
{
if (s == null || s.length() < 4 || !s.startsWith("${") || !s.endsWith("}"))

import org.apache.wicket.request.Url.QueryParameter;
import org.apache.wicket.request.mapper.parameter.IPageParametersEncoder;
import org.apache.wicket.request.mapper.parameter.PageParameters;
import org.apache.wicket.util.lang.Args;
import org.apache.wicket.util.string.Strings;
public abstract class AbstractMapper implements IRequestMapper
{
protected static String getPlaceholder(String s)
{
if (s == null || s.length() < 4 || !s.startsWith("${") || !s.endsWith("}"))
