/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.camel.web.util;
import org.apache.camel.builder.ExpressionClause;
import org.apache.camel.model.DelayDefinition;
import org.apache.camel.model.ExpressionNode;
import org.apache.camel.model.FilterDefinition;
import org.apache.camel.model.IdempotentConsumerDefinition;
import org.apache.camel.model.LoopDefinition;
import org.apache.camel.model.ProcessorDefinition;
import org.apache.camel.model.RecipientListDefinition;
import org.apache.camel.model.RoutingSlipDefinition;
import org.apache.camel.model.SetBodyDefinition;
import org.apache.camel.model.SetHeaderDefinition;
import org.apache.camel.model.SetOutHeaderDefinition;
import org.apache.camel.model.SetPropertyDefinition;
import org.apache.camel.model.SplitDefinition;
import org.apache.camel.model.TransformDefinition;
import org.apache.camel.model.WhenDefinition;
import org.apache.camel.model.language.ConstantExpression;
import org.apache.camel.model.language.ExpressionDefinition;
import org.apache.camel.processor.idempotent.FileIdempotentRepository;
import org.apache.camel.processor.idempotent.MemoryIdempotentRepository;
import org.apache.camel.spi.IdempotentRepository;
public final class ExpressionNodeRenderer {
private ExpressionNodeRenderer() {
// Utility class, no public or protected default constructor
}
public static void render(StringBuilder buffer, ProcessorDefinition processor) {
ExpressionNode expNode = (ExpressionNode)processor;
buffer.append(".").append(expNode.getShortName());
if (expNode instanceof DelayDefinition) {
renderDelay(buffer, expNode);
} else if (expNode instanceof FilterDefinition) {
renderFilter(buffer, expNode);
} else if (expNode instanceof IdempotentConsumerDefinition) {
renderIdempotentConsumer(buffer, expNode);
} else if (expNode instanceof LoopDefinition) {
renderLoop(buffer, expNode);
} else if (expNode instanceof RecipientListDefinition) {
ExpressionDefinition expression = expNode.getExpression();
buffer.append("(");
ExpressionRenderer.render(buffer, expression);
buffer.append(")");
} else if (expNode instanceof RoutingSlipDefinition) {
ExpressionDefinition expression = expNode.getExpression();
buffer.append("(");
ExpressionRenderer.render(buffer, expression);
if (((RoutingSlipDefinition)expNode).getUriDelimiter() != null) {
buffer.append(", \"");
buffer.append(((RoutingSlipDefinition)expNode).getUriDelimiter());
buffer.append("\"");
}
buffer.append(")");
} else if (expNode instanceof SetBodyDefinition) {
renderSetBody(buffer, expNode);
} else if (expNode instanceof SetHeaderDefinition) {
renderSetHeader(buffer, expNode);
} else if (expNode instanceof SetOutHeaderDefinition) {
// TODO unsupported expression node
buffer.append("(\"setOutHeaderDefinition\")");
} else if (expNode instanceof SetPropertyDefinition) {
renderSetProperty(buffer, expNode);
} else if (expNode instanceof SplitDefinition) {
renderSplit(buffer, expNode);
} else if (expNode instanceof TransformDefinition) {
renderTransform(buffer, expNode);
} else if (expNode instanceof WhenDefinition) {
renderWhen(buffer, expNode);
}
}
private static void renderDelay(StringBuilder buffer, ExpressionNode expNode) {
ExpressionDefinition expression = expNode.getExpression();
String delay = expression.getExpressionValue().toString();
if (!delay.contains("(")) {
String delayTime = expression.getExpressionValue().toString();
buffer.append("(").append(delayTime).append(")");
} else {
buffer.append("()");
ExpressionRenderer.render(buffer, expression);
}
}
private static void renderFilter(StringBuilder buffer, ExpressionNode expNode) {
ExpressionDefinition expression = expNode.getExpression();
if (!(expression instanceof ExpressionClause)) {
if (expression.getPredicate() != null) {
buffer.append("(");
PredicateRenderer.render(buffer, expression.getPredicate());
buffer.append(")");
}
} else {
String language = expression.getLanguage();
if (language != null && !language.equals("")) {
buffer.append("()");
ExpressionRenderer.render(buffer, expression);
} else {
buffer.append("()");
ExpressionRenderer.render(buffer, expression);
}
}
}
private static void renderIdempotentConsumer(StringBuilder buffer, ExpressionNode expNode) {
ExpressionDefinition expression = expNode.getExpression();
IdempotentConsumerDefinition idempotentConsume = (IdempotentConsumerDefinition)expNode;
buffer.append("(");
ExpressionRenderer.render(buffer, expression);
buffer.append(", ");
IdempotentRepository repository = idempotentConsume.getMessageIdRepository();
if (repository instanceof FileIdempotentRepository) {
// TODO need to be improved
buffer.append("FileIdempotentRepository.fileIdempotentRepository()");
} else if (repository instanceof MemoryIdempotentRepository) {
buffer.append("MemoryIdempotentRepository.memoryIdempotentRepository()");
}
buffer.append(")");
if (!idempotentConsume.isEager()) {
buffer.append(".eager(false)");
}
}
private static void renderLoop(StringBuilder buffer, ExpressionNode expNode) {
ExpressionDefinition expression = expNode.getExpression();
if (expression instanceof ConstantExpression) {
buffer.append("(").append(expression.getExpression()).append(")");
} else {
buffer.append("()");
ExpressionRenderer.render(buffer, expression);
}
}
private static void renderSetBody(StringBuilder buffer, ExpressionNode expNode) {
ExpressionDefinition expression = expNode.getExpression();
String expValue = expression.getExpressionValue().toString();
if (expValue.startsWith("append")) {
buffer.append("(");
ExpressionRenderer.render(buffer, expression);
buffer.append(")");
} else {
buffer.append("()");
ExpressionRenderer.renderConstant(buffer, expression);
}
}
private static void renderSetHeader(StringBuilder buffer, ExpressionNode expNode) {
ExpressionDefinition expression = expNode.getExpression();
SetHeaderDefinition set = (SetHeaderDefinition)expNode;
buffer.append("(\"").append(set.getHeaderName()).append("\")");
if (expression.getExpressionValue() != null) {
ExpressionRenderer.renderConstant(buffer, expression);
} else if (expression.getExpressionType() != null) {
ExpressionRenderer.render(buffer, expression);
}
}
private static void renderSetProperty(StringBuilder buffer, ExpressionNode expNode) {
ExpressionDefinition expression = expNode.getExpression();
SetPropertyDefinition set = (SetPropertyDefinition)expNode;
buffer.append("(\"").append(set.getPropertyName()).append("\")");
if (expression.getExpressionValue() != null) {
ExpressionRenderer.renderConstant(buffer, expression);
} else if (expression.getExpressionType() != null) {
ExpressionRenderer.render(buffer, expression);
}
}
private static void renderSplit(StringBuilder buffer, ExpressionNode expNode) {
ExpressionDefinition expression = expNode.getExpression();
if (expression.getExpressionValue() != null) {
buffer.append("(");
ExpressionRenderer.render(buffer, expression);
buffer.append(")");
} else if (expression.getExpressionType() != null) {
buffer.append("().");
ExpressionRenderer.render(buffer, expression);
}
SplitDefinition split = (SplitDefinition)expNode;
if (split.isStreaming()) {
buffer.append(".streaming()");
}
}
private static void renderTransform(StringBuilder buffer, ExpressionNode expNode) {
ExpressionDefinition expression = expNode.getExpression();
String expValue = expression.getExpressionValue().toString();
if (expValue.startsWith("append") || expValue.startsWith("prepend") || expValue.startsWith("to")) {
buffer.append("(");
ExpressionRenderer.render(buffer, expression);
buffer.append(")");
} else if (expValue.startsWith("xpath")) {
buffer.append("()");
ExpressionRenderer.render(buffer, expression);
} else {
buffer.append("(constant(\"").append(expression.getExpressionValue().toString()).append("\"))");
}
}
private static void renderWhen(StringBuilder buffer, ExpressionNode expNode) {
ExpressionDefinition expression = expNode.getExpression();
if (expression.getPredicate() != null) {
buffer.append("(");
PredicateRenderer.render(buffer, expression.getPredicate());
buffer.append(")");
}
if (expression instanceof ExpressionClause) {
buffer.append("()");
ExpressionRenderer.render(buffer, (ExpressionClause)expression);
}
}
}