/*
* Copyright 2013-2014 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.web;
import static org.springframework.data.web.SpringDataAnnotationUtils.*;
import java.lang.reflect.Method;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.core.MethodParameter;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Pageable;
import org.springframework.data.domain.Sort;
import org.springframework.util.Assert;
import org.springframework.util.StringUtils;
import org.springframework.web.bind.support.WebDataBinderFactory;
import org.springframework.web.context.request.NativeWebRequest;
import org.springframework.web.method.support.HandlerMethodArgumentResolver;
import org.springframework.web.method.support.ModelAndViewContainer;
/**
* Extracts paging information from web requests and thus allows injecting {@link Pageable} instances into controller
* methods. Request properties to be parsed can be configured. Default configuration uses request parameters beginning
* with {@link #DEFAULT_PAGE_PARAMETER}{@link #DEFAULT_QUALIFIER_DELIMITER}.
*
* @since 1.6
* @author Oliver Gierke
* @author Nick Williams
*/
public class PageableHandlerMethodArgumentResolver implements HandlerMethodArgumentResolver {
private static final String INVALID_DEFAULT_PAGE_SIZE = "Invalid default page size configured for method %s! Must not be less than one!";
private static final String DEFAULT_PAGE_PARAMETER = "page";
private static final String DEFAULT_SIZE_PARAMETER = "size";
private static final String DEFAULT_PREFIX = "";
private static final String DEFAULT_QUALIFIER_DELIMITER = "_";
private static final int DEFAULT_MAX_PAGE_SIZE = 2000;
static final Pageable DEFAULT_PAGE_REQUEST = new PageRequest(0, 20);
private Pageable fallbackPageable = DEFAULT_PAGE_REQUEST;
private SortHandlerMethodArgumentResolver sortResolver;
private String pageParameterName = DEFAULT_PAGE_PARAMETER;
private String sizeParameterName = DEFAULT_SIZE_PARAMETER;
private String prefix = DEFAULT_PREFIX;
private String qualifierDelimiter = DEFAULT_QUALIFIER_DELIMITER;
private int maxPageSize = DEFAULT_MAX_PAGE_SIZE;
private boolean oneIndexedParameters = false;
/**
* Constructs an instance of this resolved with a default {@link SortHandlerMethodArgumentResolver}.
*/
public PageableHandlerMethodArgumentResolver() {
this(null);
}
/**
* Constructs an instance of this resolver with the specified {@link SortHandlerMethodArgumentResolver}.
*
* @param sortResolver The sort resolver to use
*/
public PageableHandlerMethodArgumentResolver(SortHandlerMethodArgumentResolver sortResolver) {
this.sortResolver = sortResolver == null ? new SortHandlerMethodArgumentResolver() : sortResolver;
}
/**
* Configures the {@link Pageable} to be used as fallback in case no {@link PageableDefault} or
* {@link PageableDefaults} (the latter only supported in legacy mode) can be found at the method parameter to be
* resolved.
* <p>
* If you set this to {@literal null}, be aware that you controller methods will get {@literal null} handed into them
* in case no {@link Pageable} data can be found in the request. Note, that doing so will require you supply bot the
* page <em>and</em> the size parameter with the requests as there will be no default for any of the parameters
* available.
*
* @param fallbackPageable the {@link Pageable} to be used as general fallback.
*/
public void setFallbackPageable(Pageable fallbackPageable) {
this.fallbackPageable = fallbackPageable;
}
/**
* Returns whether the given {@link Pageable} is the fallback one.
*
* @param pageable
* @since 1.9
* @return
*/
public boolean isFallbackPageable(Pageable pageable) {
return this.fallbackPageable.equals(pageable);
}
/**
* Configures the maximum page size to be accepted. This allows to put an upper boundary of the page size to prevent
* potential attacks trying to issue an {@link OutOfMemoryError}. Defaults to {@link #DEFAULT_MAX_PAGE_SIZE}.
*
* @param maxPageSize the maxPageSize to set
*/
public void setMaxPageSize(int maxPageSize) {
this.maxPageSize = maxPageSize;
}
/**
* Retrieves the maximum page size to be accepted. This allows to put an upper boundary of the page size to prevent
* potential attacks trying to issue an {@link OutOfMemoryError}. Defaults to {@link #DEFAULT_MAX_PAGE_SIZE}.
*
* @return the maximum page size allowed.
*/
protected int getMaxPageSize() {
return this.maxPageSize;
}
/**
* Configures the parameter name to be used to find the page number in the request. Defaults to {@code page}.
*
* @param pageParameterName the parameter name to be used, must not be {@literal null} or empty.
*/
public void setPageParameterName(String pageParameterName) {
Assert.hasText(pageParameterName, "Page parameter name must not be null or empty!");
this.pageParameterName = pageParameterName;
}
/**
* Retrieves the parameter name to be used to find the page number in the request. Defaults to {@code page}.
*
* @return the parameter name to be used, never {@literal null} or empty.
*/
protected String getPageParameterName() {
return this.pageParameterName;
}
/**
* Configures the parameter name to be used to find the page size in the request. Defaults to {@code size}.
*
* @param sizeParameterName the parameter name to be used, must not be {@literal null} or empty.
*/
public void setSizeParameterName(String sizeParameterName) {
Assert.hasText(sizeParameterName, "Size parameter name must not be null or empty!");
this.sizeParameterName = sizeParameterName;
}
/**
* Retrieves the parameter name to be used to find the page size in the request. Defaults to {@code size}.
*
* @return the parameter name to be used, never {@literal null} or empty.
*/
protected String getSizeParameterName() {
return this.sizeParameterName;
}
/**
* Configures a general prefix to be prepended to the page number and page size parameters. Useful to namespace the
* property names used in case they are clashing with ones used by your application. By default, no prefix is used.
*
* @param prefix the prefix to be used or {@literal null} to reset to the default.
*/
public void setPrefix(String prefix) {
this.prefix = prefix == null ? DEFAULT_PREFIX : prefix;
}
/**
* The delimiter to be used between the qualifier and the actual page number and size properties. Defaults to
* {@code _}. So a qualifier of {@code foo} will result in a page number parameter of {@code foo_page}.
*
* @param qualifierDelimiter the delimter to be used or {@literal null} to reset to the default.
*/
public void setQualifierDelimiter(String qualifierDelimiter) {
this.qualifierDelimiter = qualifierDelimiter == null ? DEFAULT_QUALIFIER_DELIMITER : qualifierDelimiter;
}
/**
* Configures whether to expose and assume 1-based page number indexes in the request parameters. Defaults to
* {@literal false}, meaning a page number of 0 in the request equals the first page. If this is set to
* {@literal true}, a page number of 1 in the request will be considered the first page.
*
* @param oneIndexedParameters the oneIndexedParameters to set
*/
public void setOneIndexedParameters(boolean oneIndexedParameters) {
this.oneIndexedParameters = oneIndexedParameters;
}
/**
* Indicates whether to expose and assume 1-based page number indexes in the request parameters. Defaults to
* {@literal false}, meaning a page number of 0 in the request equals the first page. If this is set to
* {@literal true}, a page number of 1 in the request will be considered the first page.
*
* @return whether to assume 1-based page number indexes in the request parameters.
*/
protected boolean isOneIndexedParameters() {
return this.oneIndexedParameters;
}
/*
* (non-Javadoc)
* @see org.springframework.web.method.support.HandlerMethodArgumentResolver#supportsParameter(org.springframework.core.MethodParameter)
*/
@Override
public boolean supportsParameter(MethodParameter parameter) {
return Pageable.class.equals(parameter.getParameterType());
}
/*
* (non-Javadoc)
* @see org.springframework.web.method.support.HandlerMethodArgumentResolver#resolveArgument(org.springframework.core.MethodParameter, org.springframework.web.method.support.ModelAndViewContainer, org.springframework.web.context.request.NativeWebRequest, org.springframework.web.bind.support.WebDataBinderFactory)
*/
@Override
public Pageable resolveArgument(MethodParameter methodParameter, ModelAndViewContainer mavContainer,
NativeWebRequest webRequest, WebDataBinderFactory binderFactory) {
assertPageableUniqueness(methodParameter);
Pageable defaultOrFallback = getDefaultFromAnnotationOrFallback(methodParameter);
String pageString = webRequest.getParameter(getParameterNameToUse(pageParameterName, methodParameter));
String pageSizeString = webRequest.getParameter(getParameterNameToUse(sizeParameterName, methodParameter));
boolean pageAndSizeGiven = StringUtils.hasText(pageString) && StringUtils.hasText(pageSizeString);
if (!pageAndSizeGiven && defaultOrFallback == null) {
return null;
}
int page = StringUtils.hasText(pageString) ? parseAndApplyBoundaries(pageString, 0, Integer.MAX_VALUE)
- (oneIndexedParameters ? 1 : 0) : defaultOrFallback.getPageNumber();
int pageSize = StringUtils.hasText(pageSizeString) ? parseAndApplyBoundaries(pageSizeString, 0, maxPageSize)
: defaultOrFallback.getPageSize();
// Limit lower bound
pageSize = pageSize < 1 ? defaultOrFallback.getPageSize() : pageSize;
// Limit upper bound
pageSize = pageSize > maxPageSize ? maxPageSize : pageSize;
Sort sort = sortResolver.resolveArgument(methodParameter, mavContainer, webRequest, binderFactory);
return new PageRequest(page, pageSize, sort == null ? defaultOrFallback.getSort() : sort);
}
/**
* Returns the name of the request parameter to find the {@link Pageable} information in. Inspects the given
* {@link MethodParameter} for {@link Qualifier} present and prefixes the given source parameter name with it.
*
* @param source the basic parameter name.
* @param parameter the {@link MethodParameter} potentially qualified.
* @return the name of the request parameter.
*/
protected String getParameterNameToUse(String source, MethodParameter parameter) {
StringBuilder builder = new StringBuilder(prefix);
if (parameter != null && parameter.hasParameterAnnotation(Qualifier.class)) {
builder.append(parameter.getParameterAnnotation(Qualifier.class).value());
builder.append(qualifierDelimiter);
}
return builder.append(source).toString();
}
private Pageable getDefaultFromAnnotationOrFallback(MethodParameter methodParameter) {
if (methodParameter.hasParameterAnnotation(PageableDefault.class)) {
return getDefaultPageRequestFrom(methodParameter);
}
return fallbackPageable;
}
private static Pageable getDefaultPageRequestFrom(MethodParameter parameter) {
PageableDefault defaults = parameter.getParameterAnnotation(PageableDefault.class);
Integer defaultPageNumber = defaults.page();
Integer defaultPageSize = getSpecificPropertyOrDefaultFromValue(defaults, "size");
if (defaultPageSize < 1) {
Method annotatedMethod = parameter.getMethod();
throw new IllegalStateException(String.format(INVALID_DEFAULT_PAGE_SIZE, annotatedMethod));
}
if (defaults.sort().length == 0) {
return new PageRequest(defaultPageNumber, defaultPageSize);
}
return new PageRequest(defaultPageNumber, defaultPageSize, defaults.direction(), defaults.sort());
}
/**
* Tries to parse the given {@link String} into an integer and applies the given boundaries. Will return the lower
* boundary if the {@link String} cannot be parsed.
*
* @param parameter
* @param lower
* @param upper
* @return
*/
private static int parseAndApplyBoundaries(String parameter, int lower, int upper) {
try {
int parsed = Integer.parseInt(parameter);
return parsed < lower ? lower : parsed > upper ? upper : parsed;
} catch (NumberFormatException e) {
return lower;
}
}
}