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Cassandra support for Spring Data
/*
* Copyright 2016-2018 the original author or authors.
*
* 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.springframework.data.cassandra.repository.query;
import java.lang.annotation.Annotation;
import java.lang.reflect.AnnotatedElement;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.List;
import org.springframework.core.MethodParameter;
import org.springframework.core.ResolvableType;
import org.springframework.core.annotation.AnnotatedElementUtils;
import org.springframework.data.cassandra.core.cql.QueryOptions;
import org.springframework.data.cassandra.core.mapping.CassandraType;
import org.springframework.data.cassandra.repository.query.CassandraParameters.CassandraParameter;
import org.springframework.data.repository.query.Parameter;
import org.springframework.data.repository.query.Parameters;
import org.springframework.data.repository.util.QueryExecutionConverters;
import org.springframework.data.repository.util.ReactiveWrappers;
import org.springframework.lang.Nullable;
/**
* Custom extension of {@link Parameters} discovering additional properties of query method parameters.
*
* @author Matthew Adams
* @author Mark Paluch
*/
public class CassandraParameters extends Parameters {
private final @Nullable Integer queryOptionsIndex;
/**
* Create a new {@link CassandraParameters} instance from the given {@link Method}
*
* @param method must not be {@literal null}.
*/
public CassandraParameters(Method method) {
super(method);
this.queryOptionsIndex = Arrays.asList(method.getParameterTypes()).indexOf(QueryOptions.class);
}
private CassandraParameters(List originals, @Nullable Integer queryOptionsIndex) {
super(originals);
this.queryOptionsIndex = queryOptionsIndex;
}
/* (non-Javadoc)
* @see org.springframework.data.repository.query.Parameters#createParameter(org.springframework.core.MethodParameter)
*/
@Override
protected CassandraParameter createParameter(MethodParameter parameter) {
return new CassandraParameter(parameter);
}
/* (non-Javadoc)
* @see org.springframework.data.repository.query.Parameters#createFrom(java.util.List)
*/
@Override
protected CassandraParameters createFrom(List parameters) {
return new CassandraParameters(parameters, queryOptionsIndex);
}
/**
* Returns the index of the {@link QueryOptions} parameter to be applied to queries.
*
* @return
* @since 2.0
*/
public int getQueryOptionsIndex() {
return (queryOptionsIndex != null ? queryOptionsIndex : -1);
}
/**
* Custom {@link Parameter} implementation adding {@link CassandraType} support.
*
* @author Mark Paluch
*/
static class CassandraParameter extends Parameter {
private final @Nullable CassandraType cassandraType;
private final Class parameterType;
CassandraParameter(MethodParameter parameter) {
super(parameter);
AnnotatedParameter annotatedParameter = new AnnotatedParameter(parameter);
if (AnnotatedElementUtils.hasAnnotation(annotatedParameter, CassandraType.class)) {
this.cassandraType = AnnotatedElementUtils.findMergedAnnotation(annotatedParameter, CassandraType.class);
} else {
this.cassandraType = null;
}
parameterType = potentiallyUnwrapParameterType(parameter);
}
/* (non-Javadoc)
* @see org.springframework.data.repository.query.Parameter#isSpecialParameter()
*/
@Override
public boolean isSpecialParameter() {
return super.isSpecialParameter() || QueryOptions.class.isAssignableFrom(getType());
}
/**
* Returns the {@link CassandraType} for the declared parameter if specified using
* {@link org.springframework.data.cassandra.core.mapping.CassandraType}.
*
* @return the {@link CassandraType} or {@literal null}.
*/
@Nullable
public CassandraType getCassandraType() {
return this.cassandraType;
}
/* (non-Javadoc)
* @see org.springframework.data.repository.query.Parameter#getType()
*/
@Override
public Class getType() {
return this.parameterType;
}
/**
* Returns the component type if the given {@link MethodParameter} is a wrapper type and the wrapper should be
* unwrapped.
*
* @param parameter must not be {@literal null}.
*/
private static Class potentiallyUnwrapParameterType(MethodParameter parameter) {
Class originalType = parameter.getParameterType();
if (isWrapped(parameter) && shouldUnwrap(parameter)) {
return ResolvableType.forMethodParameter(parameter).getGeneric(0).getRawClass();
}
return originalType;
}
/**
* Returns whether the {@link MethodParameter} is wrapped in a wrapper type.
*
* @param parameter must not be {@literal null}.
* @see QueryExecutionConverters
*/
private static boolean isWrapped(MethodParameter parameter) {
return QueryExecutionConverters.supports(parameter.getParameterType());
}
/**
* Returns whether the {@link MethodParameter} should be unwrapped.
*
* @param parameter must not be {@literal null}.
* @see QueryExecutionConverters
*/
private static boolean shouldUnwrap(MethodParameter parameter) {
return QueryExecutionConverters.supportsUnwrapping(parameter.getParameterType())
|| ReactiveWrappers.supports(parameter.getParameterType());
}
}
/**
* {@link AnnotatedElement} implementation as annotation source for {@link AnnotatedElementUtils}.
*
* @author Mark Paluch
*/
static class AnnotatedParameter implements AnnotatedElement {
private final MethodParameter methodParameter;
AnnotatedParameter(MethodParameter methodParameter) {
this.methodParameter = methodParameter;
}
/**
* @inheritDoc
*/
@Override
@Nullable
public T getAnnotation(Class annotationClass) {
return methodParameter.getParameterAnnotation(annotationClass);
}
/**
* @inheritDoc
*/
@Override
public Annotation[] getAnnotations() {
return methodParameter.getParameterAnnotations();
}
/**
* @inheritDoc
*/
@Override
public Annotation[] getDeclaredAnnotations() {
return methodParameter.getParameterAnnotations();
}
}
}