io.undertow.server.handlers.form.FormParserFactory Maven / Gradle / Ivy
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* Copyright 2014 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* 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 io.undertow.server.handlers.form;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import io.undertow.server.HttpServerExchange;
import io.undertow.util.AttachmentKey;
/**
* Factory class that can create a form data parser for a given request.
*
* It does this by iterating the available parser definitions, and returning
* the first parser that is created.
*
* @author Stuart Douglas
*/
public class FormParserFactory {
private static final AttachmentKey ATTACHMENT_KEY = AttachmentKey.create(FormDataParser.class);
private final ParserDefinition[] parserDefinitions;
FormParserFactory(final List parserDefinitions) {
this.parserDefinitions = parserDefinitions.toArray(new ParserDefinition[parserDefinitions.size()]);
}
/**
* Creates a form data parser for this request. If a parser has already been created for the request the
* existing parser will be returned rather than creating a new one.
*
* @param exchange The exchange
* @return A form data parser, or null if there is no parser registered for the request content type
*/
public FormDataParser createParser(final HttpServerExchange exchange) {
FormDataParser existing = exchange.getAttachment(ATTACHMENT_KEY);
if(existing != null) {
return existing;
}
for (int i = 0; i < parserDefinitions.length; ++i) {
FormDataParser parser = parserDefinitions[i].create(exchange);
if (parser != null) {
exchange.putAttachment(ATTACHMENT_KEY, parser);
return parser;
}
}
return null;
}
public interface ParserDefinition {
FormDataParser create(final HttpServerExchange exchange);
T setDefaultEncoding(String charset);
}
public static Builder builder() {
return builder(true);
}
public static Builder builder(boolean includeDefault) {
Builder builder = new Builder();
if (includeDefault) {
builder.addParsers(new FormEncodedDataDefinition(), new MultiPartParserDefinition());
}
return builder;
}
public static class Builder {
private List parsers = new ArrayList<>();
private String defaultCharset = null;
public Builder addParser(final ParserDefinition definition) {
parsers.add(definition);
return this;
}
public Builder addParsers(final ParserDefinition... definition) {
parsers.addAll(Arrays.asList(definition));
return this;
}
public Builder addParsers(final List definition) {
parsers.addAll(definition);
return this;
}
public List getParsers() {
return parsers;
}
public void setParsers(List parsers) {
this.parsers = parsers;
}
/**
* A chainable version of {@link #setParsers}.
*/
public Builder withParsers(List parsers) {
setParsers(parsers);
return this;
}
public String getDefaultCharset() {
return defaultCharset;
}
public void setDefaultCharset(String defaultCharset) {
this.defaultCharset = defaultCharset;
}
/**
* A chainable version of {@link #setDefaultCharset}.
*/
public Builder withDefaultCharset(String defaultCharset) {
setDefaultCharset(defaultCharset);
return this;
}
public FormParserFactory build() {
if(defaultCharset != null) {
for (ParserDefinition parser : parsers) {
parser.setDefaultEncoding(defaultCharset);
}
}
return new FormParserFactory(parsers);
}
}
}