io.undertow.server.handlers.SetAttributeHandler Maven / Gradle / Ivy
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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including
all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and
JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up
with different versions on classes on the class path).
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/*
* 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.server.handlers;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import io.undertow.attribute.ExchangeAttribute;
import io.undertow.attribute.ExchangeAttributeParser;
import io.undertow.attribute.ExchangeAttributes;
import io.undertow.attribute.NullAttribute;
import io.undertow.attribute.ReadOnlyAttributeException;
import io.undertow.server.HandlerWrapper;
import io.undertow.server.HttpHandler;
import io.undertow.server.HttpServerExchange;
import io.undertow.server.ResponseCommitListener;
import io.undertow.server.handlers.builder.HandlerBuilder;
/**
* Handler that can set an arbitrary attribute on the exchange. Both the attribute and the
* value to set are expressed as exchange attributes.
*
*
* @author Stuart Douglas
*/
public class SetAttributeHandler implements HttpHandler {
private final HttpHandler next;
private final ExchangeAttribute attribute;
private final ExchangeAttribute value;
private final boolean preCommit;
public SetAttributeHandler(HttpHandler next, ExchangeAttribute attribute, ExchangeAttribute value) {
this(next, attribute, value, false);
}
public SetAttributeHandler(HttpHandler next, final String attribute, final String value) {
this.next = next;
ExchangeAttributeParser parser = ExchangeAttributes.parser(getClass().getClassLoader());
this.attribute = parser.parseSingleToken(attribute);
this.value = parser.parse(value);
this.preCommit = false;
}
public SetAttributeHandler(HttpHandler next, final String attribute, final String value, final ClassLoader classLoader) {
this.next = next;
ExchangeAttributeParser parser = ExchangeAttributes.parser(classLoader);
this.attribute = parser.parseSingleToken(attribute);
this.value = parser.parse(value);
this.preCommit = false;
}
public SetAttributeHandler(HttpHandler next, ExchangeAttribute attribute, ExchangeAttribute value, boolean preCommit) {
this.next = next;
this.attribute = attribute;
this.value = value;
this.preCommit = preCommit;
}
public SetAttributeHandler(HttpHandler next, final String attribute, final String value, boolean preCommit) {
this.next = next;
this.preCommit = preCommit;
ExchangeAttributeParser parser = ExchangeAttributes.parser(getClass().getClassLoader());
this.attribute = parser.parseSingleToken(attribute);
this.value = parser.parse(value);
}
public SetAttributeHandler(HttpHandler next, final String attribute, final String value, final ClassLoader classLoader, boolean preCommit) {
this.next = next;
this.preCommit = preCommit;
ExchangeAttributeParser parser = ExchangeAttributes.parser(classLoader);
this.attribute = parser.parseSingleToken(attribute);
this.value = parser.parse(value);
}
public ExchangeAttribute getValue() {
return value;
}
@Override
public String toString() {
return "set( attribute='" + attribute.toString() + "', value='" + value.toString() + "' )";
}
@Override
public void handleRequest(HttpServerExchange exchange) throws Exception {
if(preCommit) {
exchange.addResponseCommitListener(new ResponseCommitListener() {
@Override
public void beforeCommit(HttpServerExchange exchange) {
try {
attribute.writeAttribute(exchange, value.readAttribute(exchange));
} catch (ReadOnlyAttributeException e) {
throw new RuntimeException(e);
}
}
});
} else {
attribute.writeAttribute(exchange, value.readAttribute(exchange));
}
next.handleRequest(exchange);
}
public static class Builder implements HandlerBuilder {
@Override
public String name() {
return "set";
}
@Override
public Map> parameters() {
Map> parameters = new HashMap<>();
parameters.put("value", ExchangeAttribute.class);
parameters.put("attribute", ExchangeAttribute.class);
parameters.put("pre-commit", Boolean.class);
return parameters;
}
@Override
public Set requiredParameters() {
final Set req = new HashSet<>();
req.add("value");
req.add("attribute");
return req;
}
@Override
public String defaultParameter() {
return null;
}
@Override
public HandlerWrapper build(final Map config) {
final ExchangeAttribute value = (ExchangeAttribute) config.get("value");
final ExchangeAttribute attribute = (ExchangeAttribute) config.get("attribute");
final Boolean preCommit = (Boolean) config.get("pre-commit");
return new HandlerWrapper() {
@Override
public HttpHandler wrap(HttpHandler handler) {
return new SetAttributeHandler(handler, attribute, value, preCommit == null ? false : preCommit);
}
};
}
}
public static class ClearBuilder implements HandlerBuilder {
@Override
public String name() {
return "clear";
}
@Override
public Map> parameters() {
Map> parameters = new HashMap<>();
parameters.put("attribute", ExchangeAttribute.class);
parameters.put("pre-commit", Boolean.class);
return parameters;
}
@Override
public Set requiredParameters() {
final Set req = new HashSet<>();
req.add("attribute");
return req;
}
@Override
public String defaultParameter() {
return "attribute";
}
@Override
public HandlerWrapper build(final Map config) {
final ExchangeAttribute attribute = (ExchangeAttribute) config.get("attribute");
final Boolean preCommit = (Boolean) config.get("pre-commit");
return new HandlerWrapper() {
@Override
public HttpHandler wrap(HttpHandler handler) {
return new SetAttributeHandler(handler, attribute, NullAttribute.INSTANCE, preCommit == null ? false : preCommit);
}
};
}
}
}