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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.impl;
import java.util.HashSet;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Set;
import javax.activation.DataHandler;
import org.apache.camel.Attachment;
import org.apache.camel.Exchange;
import org.apache.camel.util.AttachmentMap;
import org.apache.camel.util.CaseInsensitiveMap;
import org.apache.camel.util.EndpointHelper;
/**
* The default implementation of {@link org.apache.camel.Message}
*
* This implementation uses a {@link org.apache.camel.util.CaseInsensitiveMap} storing the headers.
* This allows us to be able to lookup headers using case insensitive keys, making it easier for end users
* as they do not have to be worried about using exact keys.
* See more details at {@link org.apache.camel.util.CaseInsensitiveMap}.
*
* @version
*/
public class DefaultMessage extends MessageSupport {
private boolean fault;
private Map headers;
private Map attachments;
private Map attachmentObjects;
public boolean isFault() {
return fault;
}
public void setFault(boolean fault) {
this.fault = fault;
}
public Object getHeader(String name) {
if (hasHeaders()) {
return getHeaders().get(name);
} else {
return null;
}
}
public Object getHeader(String name, Object defaultValue) {
Object answer = getHeaders().get(name);
return answer != null ? answer : defaultValue;
}
@SuppressWarnings("unchecked")
public T getHeader(String name, Class type) {
Object value = getHeader(name);
if (value == null) {
// lets avoid NullPointerException when converting to boolean for null values
if (boolean.class.isAssignableFrom(type)) {
return (T) Boolean.FALSE;
}
return null;
}
// eager same instance type test to avoid the overhead of invoking the type converter
// if already same type
if (type.isInstance(value)) {
return type.cast(value);
}
Exchange e = getExchange();
if (e != null) {
return e.getContext().getTypeConverter().convertTo(type, e, value);
} else {
return type.cast(value);
}
}
@SuppressWarnings("unchecked")
public T getHeader(String name, Object defaultValue, Class type) {
Object value = getHeader(name, defaultValue);
if (value == null) {
// lets avoid NullPointerException when converting to boolean for null values
if (boolean.class.isAssignableFrom(type)) {
return (T) Boolean.FALSE;
}
return null;
}
// eager same instance type test to avoid the overhead of invoking the type converter
// if already same type
if (type.isInstance(value)) {
return type.cast(value);
}
Exchange e = getExchange();
if (e != null) {
return e.getContext().getTypeConverter().convertTo(type, e, value);
} else {
return type.cast(value);
}
}
public void setHeader(String name, Object value) {
if (headers == null) {
headers = createHeaders();
}
headers.put(name, value);
}
public Object removeHeader(String name) {
if (!hasHeaders()) {
return null;
}
return headers.remove(name);
}
public boolean removeHeaders(String pattern) {
return removeHeaders(pattern, (String[]) null);
}
public boolean removeHeaders(String pattern, String... excludePatterns) {
if (!hasHeaders()) {
return false;
}
boolean matches = false;
// must use a set to store the keys to remove as we cannot walk using entrySet and remove at the same time
// due concurrent modification error
Set toRemove = new HashSet();
for (Map.Entry entry : headers.entrySet()) {
String key = entry.getKey();
if (EndpointHelper.matchPattern(key, pattern)) {
if (excludePatterns != null && isExcludePatternMatch(key, excludePatterns)) {
continue;
}
matches = true;
toRemove.add(entry.getKey());
}
}
for (String key : toRemove) {
headers.remove(key);
}
return matches;
}
public Map getHeaders() {
if (headers == null) {
headers = createHeaders();
}
return headers;
}
public void setHeaders(Map headers) {
if (headers instanceof CaseInsensitiveMap) {
this.headers = headers;
} else {
// wrap it in a case insensitive map
this.headers = new CaseInsensitiveMap(headers);
}
}
public boolean hasHeaders() {
if (!hasPopulatedHeaders()) {
// force creating headers
getHeaders();
}
return headers != null && !headers.isEmpty();
}
public DefaultMessage newInstance() {
return new DefaultMessage();
}
/**
* A factory method to lazily create the headers to make it easy to create
* efficient Message implementations which only construct and populate the
* Map on demand
*
* @return return a newly constructed Map possibly containing headers from
* the underlying inbound transport
*/
protected Map createHeaders() {
Map map = new CaseInsensitiveMap();
populateInitialHeaders(map);
return map;
}
/**
* A factory method to lazily create the attachmentObjects to make it easy to
* create efficient Message implementations which only construct and
* populate the Map on demand
*
* @return return a newly constructed Map
*/
protected Map createAttachments() {
Map map = new LinkedHashMap();
populateInitialAttachments(map);
return map;
}
/**
* A strategy method populate the initial set of headers on an inbound
* message from an underlying binding
*
* @param map is the empty header map to populate
*/
protected void populateInitialHeaders(Map map) {
// do nothing by default
}
/**
* A strategy method populate the initial set of attachmentObjects on an inbound
* message from an underlying binding
*
* @param map is the empty attachment map to populate
*/
protected void populateInitialAttachments(Map map) {
// do nothing by default
}
/**
* A strategy for component specific messages to determine whether the
* message is redelivered or not.
*
* Important: It is not always possible to determine if the transacted is a redelivery
* or not, and therefore null is returned. Such an example would be a JDBC message.
* However JMS brokers provides details if a transacted message is redelivered.
*
* @return true if redelivered, false if not, null if not able to determine
*/
protected Boolean isTransactedRedelivered() {
// return null by default
return null;
}
public void addAttachment(String id, DataHandler content) {
addAttachmentObject(id, new DefaultAttachment(content));
}
public void addAttachmentObject(String id, Attachment content) {
if (attachmentObjects == null) {
attachmentObjects = createAttachments();
}
attachmentObjects.put(id, content);
}
public DataHandler getAttachment(String id) {
Attachment att = getAttachmentObject(id);
if (att == null) {
return null;
} else {
return att.getDataHandler();
}
}
@Override
public Attachment getAttachmentObject(String id) {
return getAttachmentObjects().get(id);
}
public Set getAttachmentNames() {
if (attachmentObjects == null) {
attachmentObjects = createAttachments();
}
return attachmentObjects.keySet();
}
public void removeAttachment(String id) {
if (attachmentObjects != null && attachmentObjects.containsKey(id)) {
attachmentObjects.remove(id);
}
}
public Map getAttachments() {
if (attachments == null) {
attachments = new AttachmentMap(getAttachmentObjects());
}
return attachments;
}
public Map getAttachmentObjects() {
if (attachmentObjects == null) {
attachmentObjects = createAttachments();
}
return attachmentObjects;
}
public void setAttachments(Map attachments) {
if (attachments == null) {
this.attachmentObjects = null;
} else if (attachments instanceof AttachmentMap) {
// this way setAttachments(getAttachments()) will tunnel attachment headers
this.attachmentObjects = ((AttachmentMap)attachments).getOriginalMap();
} else {
this.attachmentObjects = new LinkedHashMap();
for (Map.Entry entry : attachments.entrySet()) {
this.attachmentObjects.put(entry.getKey(), new DefaultAttachment(entry.getValue()));
}
}
this.attachments = null;
}
public void setAttachmentObjects(Map attachments) {
this.attachmentObjects = attachments;
this.attachments = null;
}
public boolean hasAttachments() {
// optimized to avoid calling createAttachments as that creates a new empty map
// that we 99% do not need (only camel-mail supports attachments), and we have
// then ensure camel-mail always creates attachments to remedy for this
return this.attachmentObjects != null && this.attachmentObjects.size() > 0;
}
/**
* Returns true if the headers have been mutated in some way
*/
protected boolean hasPopulatedHeaders() {
return headers != null;
}
public String createExchangeId() {
return null;
}
private static boolean isExcludePatternMatch(String key, String... excludePatterns) {
for (String pattern : excludePatterns) {
if (EndpointHelper.matchPattern(key, pattern)) {
return true;
}
}
return false;
}
}