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The Core Camel Java DSL based router
/**
* 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.model;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlRootElement;
import org.apache.camel.ExchangePattern;
import org.apache.camel.Expression;
import org.apache.camel.NoSuchLanguageException;
import org.apache.camel.Processor;
import org.apache.camel.builder.ExpressionBuilder;
import org.apache.camel.processor.SendDynamicProcessor;
import org.apache.camel.spi.Language;
import org.apache.camel.spi.Metadata;
import org.apache.camel.spi.RouteContext;
import org.apache.camel.util.ObjectHelper;
/**
* Sends the message to a dynamic endpoint
*
* You can specify multiple languages in the uri separated by the plus sign, such as mock:+language:xpath:/order/@uri
* where mock: would be a prefix to a xpath expression.
*
* For more dynamic behavior use Recipient List or
* Dynamic Router EIP instead.
*/
@Metadata(label = "eip,endpoint,routing")
@XmlRootElement(name = "toD")
@XmlAccessorType(XmlAccessType.FIELD)
public class ToDynamicDefinition extends NoOutputDefinition {
private static final Pattern RAW_PATTERN = Pattern.compile("RAW\\([^\\)]+\\)");
@XmlAttribute @Metadata(required = "true")
private String uri;
@XmlAttribute
private ExchangePattern pattern;
@XmlAttribute
private Integer cacheSize;
@XmlAttribute
private Boolean ignoreInvalidEndpoint;
public ToDynamicDefinition() {
}
public ToDynamicDefinition(String uri) {
this.uri = uri;
}
@Override
public Processor createProcessor(RouteContext routeContext) throws Exception {
ObjectHelper.notEmpty(uri, "uri", this);
Expression exp = createExpression(routeContext);
SendDynamicProcessor processor = new SendDynamicProcessor(uri, exp);
processor.setCamelContext(routeContext.getCamelContext());
processor.setPattern(pattern);
if (cacheSize != null) {
processor.setCacheSize(cacheSize);
}
if (ignoreInvalidEndpoint != null) {
processor.setIgnoreInvalidEndpoint(ignoreInvalidEndpoint);
}
return processor;
}
protected Expression createExpression(RouteContext routeContext) {
List list = new ArrayList();
String[] parts = safeSplitRaw(uri);
for (String part : parts) {
// the part may have optional language to use, so you can mix languages
String value = ObjectHelper.after(part, "language:");
if (value != null) {
String before = ObjectHelper.before(value, ":");
String after = ObjectHelper.after(value, ":");
if (before != null && after != null) {
// maybe its a language, must have language: as prefix
try {
Language partLanguage = routeContext.getCamelContext().resolveLanguage(before);
if (partLanguage != null) {
Expression exp = partLanguage.createExpression(after);
list.add(exp);
continue;
}
} catch (NoSuchLanguageException e) {
// ignore
}
}
}
// fallback and use simple language
Language lan = routeContext.getCamelContext().resolveLanguage("simple");
Expression exp = lan.createExpression(part);
list.add(exp);
}
Expression exp;
if (list.size() == 1) {
exp = list.get(0);
} else {
exp = ExpressionBuilder.concatExpression(list);
}
return exp;
}
@Override
public String toString() {
return "DynamicTo[" + getLabel() + "]";
}
// Fluent API
// -------------------------------------------------------------------------
/**
* Sets the optional {@link ExchangePattern} used to invoke this endpoint
*/
public ToDynamicDefinition pattern(ExchangePattern pattern) {
setPattern(pattern);
return this;
}
/**
* Sets the maximum size used by the {@link org.apache.camel.impl.ConsumerCache} which is used to cache and reuse producers.
*
* @param cacheSize the cache size, use 0 for default cache size, or -1 to turn cache off.
* @return the builder
*/
public ToDynamicDefinition cacheSize(int cacheSize) {
setCacheSize(cacheSize);
return this;
}
/**
* Ignore the invalidate endpoint exception when try to create a producer with that endpoint
*
* @return the builder
*/
public ToDynamicDefinition ignoreInvalidEndpoint() {
setIgnoreInvalidEndpoint(true);
return this;
}
// Properties
// -------------------------------------------------------------------------
public String getUri() {
return uri;
}
/**
* The uri of the endpoint to send to. The uri can be dynamic computed using the {@link org.apache.camel.language.simple.SimpleLanguage} expression.
*/
public void setUri(String uri) {
this.uri = uri;
}
public ExchangePattern getPattern() {
return pattern;
}
public void setPattern(ExchangePattern pattern) {
this.pattern = pattern;
}
public Integer getCacheSize() {
return cacheSize;
}
public void setCacheSize(Integer cacheSize) {
this.cacheSize = cacheSize;
}
public Boolean getIgnoreInvalidEndpoint() {
return ignoreInvalidEndpoint;
}
public void setIgnoreInvalidEndpoint(Boolean ignoreInvalidEndpoint) {
this.ignoreInvalidEndpoint = ignoreInvalidEndpoint;
}
// Utilities
// -------------------------------------------------------------------------
private static class Pair {
int left;
int right;
Pair(int left, int right) {
this.left = left;
this.right = right;
}
}
private static List checkRAW(String s) {
Matcher matcher = RAW_PATTERN.matcher(s);
List answer = new ArrayList();
// Check all occurrences
while (matcher.find()) {
answer.add(new Pair(matcher.start(), matcher.end() - 1));
}
return answer;
}
private static boolean isRaw(int index, Listpairs) {
for (Pair pair : pairs) {
if (index < pair.left) {
return false;
} else {
if (index >= pair.left) {
if (index <= pair.right) {
return true;
} else {
continue;
}
}
}
}
return false;
}
/**
* We need to split the string safely for each + sign, but avoid splitting within RAW(...).
*/
private static String[] safeSplitRaw(String s) {
List list = new ArrayList<>();
if (!s.contains("+")) {
// no plus sign so there is only one part, so no need to split
list.add(s);
} else {
// there is a plus sign so we need to split in a safe manner
List rawPairs = checkRAW(s);
StringBuilder sb = new StringBuilder();
char chars[] = s.toCharArray();
for (int i = 0; i < chars.length; i++) {
char ch = chars[i];
if (ch != '+' || isRaw(i, rawPairs)) {
sb.append(ch);
} else {
list.add(sb.toString());
sb.setLength(0);
}
}
// any leftover?
if (sb.length() > 0) {
list.add(sb.toString());
sb.setLength(0);
}
}
return list.toArray(new String[list.size()]);
}
}