package com.codecademy.eventhub.web.commands;
import com.google.common.base.Function;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import com.codecademy.eventhub.storage.filter.And;
import com.codecademy.eventhub.storage.filter.ExactMatch;
import com.codecademy.eventhub.storage.filter.Filter;
import com.codecademy.eventhub.storage.filter.TrueFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;
import java.util.Map;
public abstract class Command {
public abstract void execute(final HttpServletRequest request, final HttpServletResponse response) throws IOException;
protected Map<String, String> toProperties(final HttpServletRequest request) {
return Maps.asMap(request.getParameterMap().keySet(), new Function<String, String>() {
@Override
public String apply(String parameterName) {
return request.getParameter(parameterName);
}
});
}
protected String[] merge(String[] x, String[] y) {
if (x == null & y == null) {
return null;
} else if (x == null) {
return y.clone();
} else if (y == null) {
return x.clone();
}
String[] ret = new String[x.length + y.length];
System.arraycopy(x, 0, ret, 0, x.length);
System.arraycopy(y, 0, ret, x.length, y.length);
return ret;
}
protected Filter getFilter(String[] filterKeys, String[] filterValues) {
if (filterKeys == null || filterValues == null) {
return TrueFilter.INSTANCE;
}
List<Filter> eventFilters = Lists.newArrayList();
for (int i = 0; i < filterKeys.length; i++) {
eventFilters.add(new ExactMatch(filterKeys[i], filterValues[i]));
}
return new And(eventFilters);
}
}