/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.deltaspike.data.impl.param;
import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.persistence.Query;
import org.apache.deltaspike.data.api.FirstResult;
import org.apache.deltaspike.data.api.MaxResults;
import org.apache.deltaspike.data.api.QueryParam;
import org.apache.deltaspike.data.api.mapping.QueryInOutMapper;
import org.apache.deltaspike.data.impl.meta.RepositoryMethod;
/**
* Convenience class to manage method and query parameters.
*/
public final class Parameters
{
private static final Logger LOG = Logger.getLogger(Parameters.class.getName());
private static final int DEFAULT_MAX = 0;
private static final int DEFAULT_FIRST = -1;
private final List<Parameter> parameterList;
private final int max;
private final int firstResult;
private Parameters(List<Parameter> parameters, int max, int firstResult)
{
this.parameterList = parameters;
this.max = max;
this.firstResult = firstResult;
}
public static Parameters createEmpty()
{
List<Parameter> empty = Collections.emptyList();
return new Parameters(empty, DEFAULT_MAX, DEFAULT_FIRST);
}
public static Parameters create(Method method, Object[] parameters, RepositoryMethod repositoryMethod)
{
int max = extractSizeRestriction(method, repositoryMethod);
int first = DEFAULT_FIRST;
List<Parameter> result = new ArrayList<Parameter>(parameters.length);
int paramIndex = 1;
Annotation[][] annotations = method.getParameterAnnotations();
for (int i = 0; i < parameters.length; i++)
{
if (isParameter(method.getParameterAnnotations()[i]))
{
QueryParam qpAnnotation = extractFrom(annotations[i], QueryParam.class);
if (qpAnnotation != null)
{
result.add(new NamedParameter(qpAnnotation.value(), parameters[i]));
}
else
{
result.add(new IndexedParameter(paramIndex++, parameters[i]));
}
}
else
{
max = extractInt(parameters[i], annotations[i], MaxResults.class, max);
first = extractInt(parameters[i], annotations[i], FirstResult.class, first);
}
}
return new Parameters(result, max, first);
}
public void applyMapper(QueryInOutMapper<?> mapper)
{
for (Parameter param : parameterList)
{
param.applyMapper(mapper);
}
}
public void updateValues(List<ParameterUpdate> updates)
{
for (ParameterUpdate update : updates)
{
for (Parameter param : parameterList)
{
if (param.is(update.forParamWithId()))
{
param.updateValue(update.newParamValue(param.queryValue()));
}
}
}
}
public Query applyTo(Query query)
{
for (Parameter param : parameterList)
{
param.apply(query);
}
return query;
}
public boolean hasSizeRestriction()
{
return max > DEFAULT_MAX;
}
public int getSizeRestriciton()
{
return max;
}
public boolean hasFirstResult()
{
return firstResult > DEFAULT_FIRST;
}
public int getFirstResult()
{
return firstResult;
}
private static int extractSizeRestriction(Method method, RepositoryMethod repositoryMethod)
{
if (method.isAnnotationPresent(org.apache.deltaspike.data.api.Query.class))
{
return method.getAnnotation(org.apache.deltaspike.data.api.Query.class).max();
}
return repositoryMethod.getDefinedMaxResults();
}
@SuppressWarnings("unchecked")
private static <A extends Annotation> A extractFrom(Annotation[] annotations, Class<A> target)
{
for (Annotation annotation : annotations)
{
if (annotation.annotationType().isAssignableFrom(target))
{
return (A) annotation;
}
}
return null;
}
private static <A extends Annotation> int extractInt(Object parameter, Annotation[] annotations,
Class<A> target, int defaultVal)
{
if (parameter != null)
{
A result = extractFrom(annotations, target);
if (result != null)
{
if (parameter instanceof Integer)
{
return (Integer) parameter;
}
else
{
LOG.log(Level.WARNING, "Method parameter extraction: " +
"Param type must be int: {0}->is:{1}",
new Object[] { target, parameter.getClass() });
}
}
}
return defaultVal;
}
private static boolean isParameter(Annotation[] annotations)
{
return extractFrom(annotations, MaxResults.class) == null &&
extractFrom(annotations, FirstResult.class) == null;
}
}