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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.component.properties;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import org.apache.camel.Endpoint;
import org.apache.camel.impl.UriEndpointComponent;
import org.apache.camel.util.FilePathResolver;
import org.apache.camel.util.LRUSoftCache;
import org.apache.camel.util.ObjectHelper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* The Properties Component allows you to use property placeholders when defining Endpoint URIs
*/
public class PropertiesComponent extends UriEndpointComponent {
/**
* The default prefix token.
*/
public static final String DEFAULT_PREFIX_TOKEN = "{{";
/**
* The default suffix token.
*/
public static final String DEFAULT_SUFFIX_TOKEN = "}}";
/**
* The default prefix token.
* @deprecated Use {@link #DEFAULT_PREFIX_TOKEN} instead.
*/
@Deprecated
public static final String PREFIX_TOKEN = DEFAULT_PREFIX_TOKEN;
/**
* The default suffix token.
* @deprecated Use {@link #DEFAULT_SUFFIX_TOKEN} instead.
*/
@Deprecated
public static final String SUFFIX_TOKEN = DEFAULT_SUFFIX_TOKEN;
/**
* Never check system properties.
*/
public static final int SYSTEM_PROPERTIES_MODE_NEVER = 0;
/**
* Check system properties if not resolvable in the specified properties.
*/
public static final int SYSTEM_PROPERTIES_MODE_FALLBACK = 1;
/**
* Check system properties first, before trying the specified properties.
* This allows system properties to override any other property source.
*
* This is the default.
*/
public static final int SYSTEM_PROPERTIES_MODE_OVERRIDE = 2;
/**
* Key for stores special override properties that containers such as OSGi can store
* in the OSGi service registry
*/
public static final String OVERRIDE_PROPERTIES = PropertiesComponent.class.getName() + ".OverrideProperties";
private static final Logger LOG = LoggerFactory.getLogger(PropertiesComponent.class);
private final Map cacheMap = new LRUSoftCache(1000);
private final Map functions = new HashMap();
private PropertiesResolver propertiesResolver = new DefaultPropertiesResolver(this);
private PropertiesParser propertiesParser = new DefaultPropertiesParser(this);
private boolean isDefaultCreated;
private String[] locations;
private boolean ignoreMissingLocation;
private String encoding;
private boolean cache = true;
private String propertyPrefix;
private String propertyPrefixResolved;
private String propertySuffix;
private String propertySuffixResolved;
private boolean fallbackToUnaugmentedProperty = true;
private String prefixToken = DEFAULT_PREFIX_TOKEN;
private String suffixToken = DEFAULT_SUFFIX_TOKEN;
private Properties initialProperties;
private Properties overrideProperties;
private int systemPropertiesMode = SYSTEM_PROPERTIES_MODE_OVERRIDE;
public PropertiesComponent() {
super(PropertiesEndpoint.class);
// include out of the box functions
addFunction(new EnvPropertiesFunction());
addFunction(new SysPropertiesFunction());
addFunction(new ServicePropertiesFunction());
addFunction(new ServiceHostPropertiesFunction());
addFunction(new ServicePortPropertiesFunction());
}
public PropertiesComponent(boolean isDefaultCreated) {
this();
this.isDefaultCreated = isDefaultCreated;
}
public PropertiesComponent(String location) {
this();
setLocation(location);
}
public PropertiesComponent(String... locations) {
this();
setLocations(locations);
}
@Override
protected Endpoint createEndpoint(String uri, String remaining, Map parameters) throws Exception {
String[] paths = locations;
// override default locations
String locations = getAndRemoveParameter(parameters, "locations", String.class);
Boolean ignoreMissingLocationLoc = getAndRemoveParameter(parameters, "ignoreMissingLocation", Boolean.class);
if (locations != null) {
LOG.trace("Overriding default locations with location: {}", locations);
paths = locations.split(",");
}
if (ignoreMissingLocationLoc != null) {
ignoreMissingLocation = ignoreMissingLocationLoc;
}
String endpointUri = parseUri(remaining, paths);
LOG.debug("Endpoint uri parsed as: {}", endpointUri);
Endpoint delegate = getCamelContext().getEndpoint(endpointUri);
PropertiesEndpoint answer = new PropertiesEndpoint(uri, delegate, this);
setProperties(answer, parameters);
return answer;
}
public String parseUri(String uri) throws Exception {
return parseUri(uri, locations);
}
public String parseUri(String uri, String... paths) throws Exception {
Properties prop = new Properties();
// use initial properties
if (null != initialProperties) {
prop.putAll(initialProperties);
}
// use locations
if (paths != null) {
// location may contain JVM system property or OS environment variables
// so we need to parse those
String[] locations = parseLocations(paths);
// check cache first
CacheKey key = new CacheKey(locations);
Properties locationsProp = cache ? cacheMap.get(key) : null;
if (locationsProp == null) {
locationsProp = propertiesResolver.resolveProperties(getCamelContext(), ignoreMissingLocation, locations);
if (cache) {
cacheMap.put(key, locationsProp);
}
}
prop.putAll(locationsProp);
}
// use override properties
if (overrideProperties != null) {
// make a copy to avoid affecting the original properties
Properties override = new Properties();
override.putAll(prop);
override.putAll(overrideProperties);
prop = override;
}
// enclose tokens if missing
if (!uri.contains(prefixToken) && !uri.startsWith(prefixToken)) {
uri = prefixToken + uri;
}
if (!uri.contains(suffixToken) && !uri.endsWith(suffixToken)) {
uri = uri + suffixToken;
}
LOG.trace("Parsing uri {} with properties: {}", uri, prop);
if (propertiesParser instanceof AugmentedPropertyNameAwarePropertiesParser) {
return ((AugmentedPropertyNameAwarePropertiesParser) propertiesParser).parseUri(uri, prop, prefixToken, suffixToken,
propertyPrefixResolved, propertySuffixResolved, fallbackToUnaugmentedProperty);
} else {
return propertiesParser.parseUri(uri, prop, prefixToken, suffixToken);
}
}
/**
* Is this component created as a default by {@link org.apache.camel.CamelContext} during starting up Camel.
*/
public boolean isDefaultCreated() {
return isDefaultCreated;
}
public String[] getLocations() {
return locations;
}
/**
* A list of locations to load properties. You can use comma to separate multiple locations.
* This option will override any default locations and only use the locations from this option.
*/
public void setLocations(String[] locations) {
// make sure to trim as people may use new lines when configuring using XML
// and do this in the setter as Spring/Blueprint resolves placeholders before Camel is being started
if (locations != null && locations.length > 0) {
for (int i = 0; i < locations.length; i++) {
String loc = locations[i];
locations[i] = loc.trim();
}
}
this.locations = locations;
}
/**
* A list of locations to load properties. You can use comma to separate multiple locations.
* This option will override any default locations and only use the locations from this option.
*/
public void setLocation(String location) {
if (location != null) {
setLocations(location.split(","));
}
}
public String getEncoding() {
return encoding;
}
/**
* Encoding to use when loading properties file from the file system or classpath.
*
* If no encoding has been set, then the properties files is loaded using ISO-8859-1 encoding (latin-1)
* as documented by {@link java.util.Properties#load(java.io.InputStream)}
*/
public void setEncoding(String encoding) {
this.encoding = encoding;
}
public PropertiesResolver getPropertiesResolver() {
return propertiesResolver;
}
/**
* To use a custom PropertiesResolver
*/
public void setPropertiesResolver(PropertiesResolver propertiesResolver) {
this.propertiesResolver = propertiesResolver;
}
public PropertiesParser getPropertiesParser() {
return propertiesParser;
}
/**
* To use a custom PropertiesParser
*/
public void setPropertiesParser(PropertiesParser propertiesParser) {
this.propertiesParser = propertiesParser;
}
public boolean isCache() {
return cache;
}
/**
* Whether or not to cache loaded properties. The default value is true.
*/
public void setCache(boolean cache) {
this.cache = cache;
}
public String getPropertyPrefix() {
return propertyPrefix;
}
/**
* Optional prefix prepended to property names before resolution.
*/
public void setPropertyPrefix(String propertyPrefix) {
this.propertyPrefix = propertyPrefix;
this.propertyPrefixResolved = propertyPrefix;
if (ObjectHelper.isNotEmpty(this.propertyPrefix)) {
this.propertyPrefixResolved = FilePathResolver.resolvePath(this.propertyPrefix);
}
}
public String getPropertySuffix() {
return propertySuffix;
}
/**
* Optional suffix appended to property names before resolution.
*/
public void setPropertySuffix(String propertySuffix) {
this.propertySuffix = propertySuffix;
this.propertySuffixResolved = propertySuffix;
if (ObjectHelper.isNotEmpty(this.propertySuffix)) {
this.propertySuffixResolved = FilePathResolver.resolvePath(this.propertySuffix);
}
}
public boolean isFallbackToUnaugmentedProperty() {
return fallbackToUnaugmentedProperty;
}
/**
* If true, first attempt resolution of property name augmented with propertyPrefix and propertySuffix
* before falling back the plain property name specified. If false, only the augmented property name is searched.
*/
public void setFallbackToUnaugmentedProperty(boolean fallbackToUnaugmentedProperty) {
this.fallbackToUnaugmentedProperty = fallbackToUnaugmentedProperty;
}
public boolean isIgnoreMissingLocation() {
return ignoreMissingLocation;
}
/**
* Whether to silently ignore if a location cannot be located, such as a properties file not found.
*/
public void setIgnoreMissingLocation(boolean ignoreMissingLocation) {
this.ignoreMissingLocation = ignoreMissingLocation;
}
public String getPrefixToken() {
return prefixToken;
}
/**
* Sets the value of the prefix token used to identify properties to replace. Setting a value of
* {@code null} restores the default token (@link {@link #DEFAULT_PREFIX_TOKEN}).
*/
public void setPrefixToken(String prefixToken) {
if (prefixToken == null) {
this.prefixToken = DEFAULT_PREFIX_TOKEN;
} else {
this.prefixToken = prefixToken;
}
}
public String getSuffixToken() {
return suffixToken;
}
/**
* Sets the value of the suffix token used to identify properties to replace. Setting a value of
* {@code null} restores the default token (@link {@link #DEFAULT_SUFFIX_TOKEN}).
*/
public void setSuffixToken(String suffixToken) {
if (suffixToken == null) {
this.suffixToken = DEFAULT_SUFFIX_TOKEN;
} else {
this.suffixToken = suffixToken;
}
}
public Properties getInitialProperties() {
return initialProperties;
}
/**
* Sets initial properties which will be used before any locations are resolved.
*
* @param initialProperties properties that are added first
*/
public void setInitialProperties(Properties initialProperties) {
this.initialProperties = initialProperties;
}
public Properties getOverrideProperties() {
return overrideProperties;
}
/**
* Sets a special list of override properties that take precedence
* and will use first, if a property exist.
*
* @param overrideProperties properties that is used first
*/
public void setOverrideProperties(Properties overrideProperties) {
this.overrideProperties = overrideProperties;
}
/**
* Gets the functions registered in this properties component.
*/
public Map getFunctions() {
return functions;
}
/**
* Registers the {@link org.apache.camel.component.properties.PropertiesFunction} as a function to this component.
*/
public void addFunction(PropertiesFunction function) {
this.functions.put(function.getName(), function);
}
/**
* Is there a {@link org.apache.camel.component.properties.PropertiesFunction} with the given name?
*/
public boolean hasFunction(String name) {
return functions.containsKey(name);
}
public int getSystemPropertiesMode() {
return systemPropertiesMode;
}
/**
* Sets the system property mode.
*
* @see #SYSTEM_PROPERTIES_MODE_NEVER
* @see #SYSTEM_PROPERTIES_MODE_FALLBACK
* @see #SYSTEM_PROPERTIES_MODE_OVERRIDE
*/
public void setSystemPropertiesMode(int systemPropertiesMode) {
this.systemPropertiesMode = systemPropertiesMode;
}
@Override
protected void doStart() throws Exception {
super.doStart();
if (systemPropertiesMode != SYSTEM_PROPERTIES_MODE_NEVER
&& systemPropertiesMode != SYSTEM_PROPERTIES_MODE_FALLBACK
&& systemPropertiesMode != SYSTEM_PROPERTIES_MODE_OVERRIDE) {
throw new IllegalArgumentException("Option systemPropertiesMode has invalid value: " + systemPropertiesMode);
}
// inject the component to the parser
if (propertiesParser instanceof DefaultPropertiesParser) {
((DefaultPropertiesParser) propertiesParser).setPropertiesComponent(this);
}
}
@Override
protected void doStop() throws Exception {
cacheMap.clear();
super.doStop();
}
private String[] parseLocations(String[] locations) {
List answer = new ArrayList();
for (String location : locations) {
LOG.trace("Parsing location: {} ", location);
try {
location = FilePathResolver.resolvePath(location);
LOG.debug("Parsed location: {} ", location);
if (ObjectHelper.isNotEmpty(location)) {
answer.add(location);
}
} catch (IllegalArgumentException e) {
if (!ignoreMissingLocation) {
throw e;
} else {
LOG.debug("Ignored missing location: {}", location);
}
}
}
// must return a not-null answer
return answer.toArray(new String[answer.size()]);
}
/**
* Key used in the locations cache
*/
private static final class CacheKey implements Serializable {
private static final long serialVersionUID = 1L;
private final String[] locations;
private CacheKey(String[] locations) {
this.locations = locations;
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
CacheKey that = (CacheKey) o;
if (!Arrays.equals(locations, that.locations)) {
return false;
}
return true;
}
@Override
public int hashCode() {
return locations != null ? Arrays.hashCode(locations) : 0;
}
@Override
public String toString() {
return "LocationKey[" + Arrays.asList(locations).toString() + "]";
}
}
}