io.undertow.annotationprocessor.ResponseParserGenerator Maven / Gradle / Ivy
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An annotation processor that is used to generate the HTTP parser
/*
* JBoss, Home of Professional Open Source.
* 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.annotationprocessor;
import org.jboss.classfilewriter.ClassFile;
import org.jboss.classfilewriter.ClassMethod;
import org.jboss.classfilewriter.code.CodeAttribute;
import java.util.concurrent.atomic.AtomicInteger;
/**
* @author Stuart Douglas
* @author Emanuel Muckenhuber
*/
public class ResponseParserGenerator extends AbstractParserGenerator {
//class names
public static final String PARSE_STATE_CLASS = "io.undertow.client.http.ResponseParseState";
public static final String HTTP_RESPONSE_CLASS = "io.undertow.client.http.HttpResponseBuilder";
//parsing states
public static final int VERSION = 0;
public static final int STATUS_CODE = 1;
public static final int REASON_PHRASE = 2;
public static final int AFTER_REASON_PHRASE = 3;
public static final int HEADER = 4;
public static final int HEADER_VALUE = 5;
public static final int PARSE_COMPLETE = 6;
public ResponseParserGenerator(String existingClassName) {
super(PARSE_STATE_CLASS, HTTP_RESPONSE_CLASS, "()V", existingClassName);
}
@Override
protected void createStateMachines(final String[] httpVerbs, final String[] httpVersions, final String[] standardHeaders, final String className, final ClassFile file, final ClassMethod sctor, final AtomicInteger fieldCounter) {
createStateMachine(httpVersions, className, file, sctor, fieldCounter, HANDLE_HTTP_VERSION, new VersionStateMachine(), false);
createStateMachine(standardHeaders, className, file, sctor, fieldCounter, HANDLE_HEADER, new HeaderStateMachine(), false);
}
private static class HeaderStateMachine implements CustomStateMachine {
@Override
public boolean isHeader() {
return true;
}
@Override
public void handleOtherToken(final CodeAttribute c) {
c.aload(PARSE_STATE_VAR);
c.swap();
c.putfield(PARSE_STATE_CLASS, "nextHeader", HTTP_STRING_DESCRIPTOR);
}
@Override
public void handleStateMachineMatchedToken(final CodeAttribute c) {
c.aload(PARSE_STATE_VAR);
c.swap();
c.putfield(PARSE_STATE_CLASS, "nextHeader", HTTP_STRING_DESCRIPTOR);
}
@Override
public void updateParseState(final CodeAttribute c) {
c.pop();
c.aload(PARSE_STATE_VAR);
c.iconst(HEADER_VALUE);
c.putfield(PARSE_STATE_CLASS, "state", "I");
}
@Override
public boolean initialNewlineMeansRequestDone() {
return true;
}
}
private static class VersionStateMachine implements CustomStateMachine {
@Override
public boolean isHeader() {
return false;
}
@Override
public void handleOtherToken(final CodeAttribute c) {
c.aload(HTTP_RESULT);
c.swap();
c.invokevirtual(HTTP_RESPONSE_CLASS, "setProtocol", "(" + HTTP_STRING_DESCRIPTOR + ")V");
}
@Override
public void handleStateMachineMatchedToken(final CodeAttribute c) {
c.aload(HTTP_RESULT);
c.swap();
c.invokevirtual(HTTP_RESPONSE_CLASS, "setProtocol", "(" + HTTP_STRING_DESCRIPTOR + ")V");
}
@Override
public void updateParseState(final CodeAttribute c) {
c.aload(PARSE_STATE_VAR);
c.swap();
c.putfield(PARSE_STATE_CLASS, "leftOver", "B");
c.aload(PARSE_STATE_VAR);
c.iconst(STATUS_CODE);
c.putfield(PARSE_STATE_CLASS, "state", "I");
}
@Override
public boolean initialNewlineMeansRequestDone() {
return false;
}
}
}
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