trunk/camel-core/src/main/java/org/apache/camel/language/simple/SimpleLanguage.java - camel - Git at Google

 /**
  * 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.language.simple;

 import org.apache.camel.Expression;
 import org.apache.camel.ExpressionIllegalSyntaxException;
 import org.apache.camel.builder.ExpressionBuilder;
 import org.apache.camel.util.ObjectHelper;
 import org.apache.camel.util.OgnlHelper;
 import org.apache.camel.util.StringHelper;

 /**
  * A <a href="http://camel.apache.org/simple.html">simple language</a>
  * which maps simple property style notations to access headers and bodies.
  * Examples of supported expressions are:
  * <ul>
  * <li>exchangeId to access the exchange id</li>
  * <li>id to access the inbound message id</li>
  * <li>in.body or body to access the inbound body</li>
  * <li>in.body.OGNL or body.OGNL to access the inbound body using an OGNL expression</li>
  * <li>mandatoryBodyAs(&lt;classname&gt;) to convert the in body to the given type, will throw exception if not possible to convert</li>
  * <li>bodyAs(&lt;classname&gt;) to convert the in body to the given type, will return null if not possible to convert</li>
  * <li>headerAs(&lt;key&gt;, &lt;classname&gt;) to convert the in header to the given type, will return null if not possible to convert</li>
  * <li>out.body to access the inbound body</li>
  * <li>in.header.foo or header.foo to access an inbound header called 'foo'</li>
  * <li>in.header.foo[bar] or header.foo[bar] to access an inbound header called 'foo' as a Map and lookup the map with 'bar' as key</li>
  * <li>in.header.foo.OGNL or header.OGNL to access an inbound header called 'foo' using an OGNL expression</li>
  * <li>out.header.foo to access an outbound header called 'foo'</li>
  * <li>property.foo to access the exchange property called 'foo'</li>
  * <li>property.foo.OGNL to access the exchange property called 'foo' using an OGNL expression</li>
  * <li>sys.foo to access the system property called 'foo'</li>
  * <li>sysenv.foo to access the system environment called 'foo'</li>
  * <li>exception.messsage to access the exception message</li>
  * <li>threadName to access the current thread name</li>
  * <li>date:&lt;command&gt;:&lt;pattern&gt; for date formatting using the {@link java.text.SimpleDateFormat} patterns.
  *     Supported commands are: <tt>now</tt> for current timestamp,
  *     <tt>in.header.xxx</tt> or <tt>header.xxx</tt> to use the Date object in the in header.
  *     <tt>out.header.xxx</tt> to use the Date object in the out header.
  * </li>
  * <li>bean:&lt;bean expression&gt; to invoke a bean using the
  * {@link org.apache.camel.language.bean.BeanLanguage BeanLanguage}</li>
  * <li>properties:&lt;[locations]&gt;:&lt;key&gt; for using property placeholders using the
  *     {@link org.apache.camel.component.properties.PropertiesComponent}.
  *     The locations parameter is optional and you can enter multiple locations separated with comma.
  * </li>
 * </ul>
  * <p/>
  * The simple language supports OGNL notation when accessing either body or header.
  * <p/>
  * The simple language now also includes file language out of the box which means the following expression is also
  * supported:
  * <ul>
  *   <li><tt>file:name</tt> to access the file name (is relative, see note below))</li>
  *   <li><tt>file:name.noext</tt> to access the file name with no extension</li>
  *   <li><tt>file:name.ext</tt> to access the file extension</li>
  *   <li><tt>file:ext</tt> to access the file extension</li>
  *   <li><tt>file:onlyname</tt> to access the file name (no paths)</li>
  *   <li><tt>file:onlyname.noext</tt> to access the file name (no paths) with no extension </li>
  *   <li><tt>file:parent</tt> to access the parent file name</li>
  *   <li><tt>file:path</tt> to access the file path name</li>
  *   <li><tt>file:absolute</tt> is the file regarded as absolute or relative</li>
  *   <li><tt>file:absolute.path</tt> to access the absolute file path name</li>
  *   <li><tt>file:length</tt> to access the file length as a Long type</li>
  *   <li><tt>file:size</tt> to access the file length as a Long type</li>
  *   <li><tt>file:modified</tt> to access the file last modified as a Date type</li>
  *   <li><tt>date:&lt;command&gt;:&lt;pattern&gt;</tt> for date formatting using the {@link java.text.SimpleDateFormat} patterns.
  *     Additional Supported commands are: <tt>file</tt> for the last modified timestamp of the file.
  *     All the commands from {@link SimpleLanguage} is also available.
  *   </li>
  * </ul>
  * The <b>relative</b> file is the filename with the starting directory clipped, as opposed to <b>path</b> that will
  * return the full path including the starting directory.
  * <br/>
  * The <b>only</b> file is the filename only with all paths clipped.
  *
  * @version
  */
 public class SimpleLanguage extends SimpleLanguageSupport {

     // singleton for expressions without a result type
     private static final SimpleLanguage SIMPLE = new SimpleLanguage();

     private Class<?> resultType;

     public Class<?> getResultType() {
         return resultType;
     }

     public void setResultType(Class<?> resultType) {
         this.resultType = resultType;
     }

     @Override
     public boolean isSingleton() {
         // we cannot be singleton as we have state
         return false;
     }

     @Override
     public Expression createExpression(String expression) {
         Expression answer = super.createExpression(expression);
         if (resultType != null) {
             return ExpressionBuilder.convertToExpression(answer, resultType);
         }
         return answer;
     }

     /**
      * Does the expression have the simple language start token?
      *
      * @param expression the expression
      * @return <tt>true</tt> if the expression contains the start token, <tt>false</tt> otherwise
      */
     public static boolean hasStartToken(String expression) {
         if (expression == null) {
             return false;
         }

         return expression.indexOf("${") >= 0 || expression.indexOf("$simple{") >= 0;
     }

     public static Expression simple(String expression) {
         return SIMPLE.createExpression(expression);
     }

     public static Expression simple(String expression, Class<?> resultType) {
         SimpleLanguage answer = new SimpleLanguage();
         answer.setResultType(resultType);
         return answer.createExpression(expression);
     }

     protected Expression createSimpleExpressionDirectly(String expression) {

         if (ObjectHelper.isEqualToAny(expression, "body", "in.body")) {
             return ExpressionBuilder.bodyExpression();
         } else if (ObjectHelper.equal(expression, "out.body")) {
             return ExpressionBuilder.outBodyExpression();
         } else if (ObjectHelper.equal(expression, "id")) {
             return ExpressionBuilder.messageIdExpression();
         } else if (ObjectHelper.equal(expression, "exchangeId")) {
             return ExpressionBuilder.exchangeIdExpression();
         } else if (ObjectHelper.equal(expression, "exception")) {
             return ExpressionBuilder.exchangeExceptionExpression();
         } else if (ObjectHelper.equal(expression, "exception.message")) {
             return ExpressionBuilder.exchangeExceptionMessageExpression();
         } else if (ObjectHelper.equal(expression, "exception.stacktrace")) {
             return ExpressionBuilder.exchangeExceptionStackTraceExpression();
         } else if (ObjectHelper.equal(expression, "threadName")) {
             return ExpressionBuilder.threadNameExpression();
         }

         return null;
     }

     protected Expression createSimpleExpression(String expression, boolean strict) {

         // return the expression directly if we can create expression without analyzing the prefix
         Expression answer = createSimpleExpressionDirectly(expression);
         if (answer != null) {
             return answer;
         }

         // bodyAs
         String remainder = ifStartsWithReturnRemainder("bodyAs", expression);
         if (remainder != null) {
             String type = ObjectHelper.between(remainder, "(", ")");
             if (type == null) {
                 throw new ExpressionIllegalSyntaxException("Valid syntax: ${bodyAs(type)} was: " + expression);
             }
             type = StringHelper.removeQuotes(type);
             return ExpressionBuilder.bodyExpression(type);
         }
         // mandatoryBodyAs
         remainder = ifStartsWithReturnRemainder("mandatoryBodyAs", expression);
         if (remainder != null) {
             String type = ObjectHelper.between(remainder, "(", ")");
             if (type == null) {
                 throw new ExpressionIllegalSyntaxException("Valid syntax: ${mandatoryBodyAs(type)} was: " + expression);
             }
             type = StringHelper.removeQuotes(type);
             return ExpressionBuilder.mandatoryBodyExpression(type);
         }

         // body OGNL
         remainder = ifStartsWithReturnRemainder("body", expression);
         if (remainder == null) {
             remainder = ifStartsWithReturnRemainder("in.body", expression);
         }
         if (remainder != null) {
             boolean invalid = OgnlHelper.isInvalidValidOgnlExpression(remainder);
             if (invalid) {
                 throw new ExpressionIllegalSyntaxException("Valid syntax: ${body.OGNL} was: " + expression);
             }
             return ExpressionBuilder.bodyOgnlExpression(remainder);
         }

         // Exception OGNL
         remainder = ifStartsWithReturnRemainder("exception", expression);
         if (remainder != null) {
             boolean invalid = OgnlHelper.isInvalidValidOgnlExpression(remainder);
             if (invalid) {
                 throw new ExpressionIllegalSyntaxException("Valid syntax: ${exception.OGNL} was: " + expression);
             }
             return ExpressionBuilder.exchangeExceptionOgnlExpression(remainder);
         }

         // headerAs
         remainder = ifStartsWithReturnRemainder("headerAs", expression);
         if (remainder != null) {
             String keyAndType = ObjectHelper.between(remainder, "(", ")");
             if (keyAndType == null) {
                 throw new ExpressionIllegalSyntaxException("Valid syntax: ${headerAs(key, type)} was: " + expression);
             }

             String key = ObjectHelper.before(keyAndType, ",");
             String type = ObjectHelper.after(keyAndType, ",");
             if (ObjectHelper.isEmpty(key) || ObjectHelper.isEmpty(type)) {
                 throw new ExpressionIllegalSyntaxException("Valid syntax: ${headerAs(key, type)} was: " + expression);
             }
             key = StringHelper.removeQuotes(key);
             type = StringHelper.removeQuotes(type);
             return ExpressionBuilder.headerExpression(key, type);
         }

         // in header expression
         remainder = ifStartsWithReturnRemainder("in.headers", expression);
         if (remainder == null) {
             remainder = ifStartsWithReturnRemainder("in.header", expression);
         }
         if (remainder == null) {
             remainder = ifStartsWithReturnRemainder("headers", expression);
         }
         if (remainder == null) {
             remainder = ifStartsWithReturnRemainder("header", expression);
         }
         if (remainder != null) {
             // remove leading character (dot or ?)
             remainder = remainder.substring(1);

             // validate syntax
             boolean invalid = OgnlHelper.isInvalidValidOgnlExpression(remainder);
             if (invalid) {
                 throw new ExpressionIllegalSyntaxException("Valid syntax: ${header.name[key]} was: " + expression);
             }

             if (OgnlHelper.isValidOgnlExpression(remainder)) {
                 // ognl based header
                 return ExpressionBuilder.headersOgnlExpression(remainder);
             } else {
                 // regular header
                 return ExpressionBuilder.headerExpression(remainder);
             }
         }

         // out header expression
         remainder = ifStartsWithReturnRemainder("out.header.", expression);
         if (remainder == null) {
             remainder = ifStartsWithReturnRemainder("out.headers.", expression);
         }
         if (remainder != null) {
             return ExpressionBuilder.outHeaderExpression(remainder);
         }

         // property
         remainder = ifStartsWithReturnRemainder("property", expression);
         if (remainder != null) {
             // remove leading character (dot or ?)
             remainder = remainder.substring(1);

             // validate syntax
             boolean invalid = OgnlHelper.isInvalidValidOgnlExpression(remainder);
             if (invalid) {
                 throw new ExpressionIllegalSyntaxException("Valid syntax: ${property.OGNL} was: " + expression);
             }

             if (OgnlHelper.isValidOgnlExpression(remainder)) {
                 // ognl based property
                 return ExpressionBuilder.propertyOgnlExpression(remainder);
             } else {
                 // regular property
                 return ExpressionBuilder.propertyExpression(remainder);
             }
         }

         // system property
         remainder = ifStartsWithReturnRemainder("sys.", expression);
         if (remainder != null) {
             return ExpressionBuilder.systemPropertyExpression(remainder);
         }

         // system property
         remainder = ifStartsWithReturnRemainder("sysenv.", expression);
         if (remainder != null) {
             return ExpressionBuilder.systemEnvironmentExpression(remainder);
         }

         // file: prefix
         remainder = ifStartsWithReturnRemainder("file:", expression);
         if (remainder != null) {
             Expression fileExpression = createSimpleFileExpression(remainder);
             if (expression != null) {
                 return fileExpression;
             }
         }

         // date: prefix
         remainder = ifStartsWithReturnRemainder("date:", expression);
         if (remainder != null) {
             String[] parts = remainder.split(":");
             if (parts.length < 2) {
                 throw new ExpressionIllegalSyntaxException("Valid syntax: ${date:command:pattern} was: " + expression);
             }
             String command = ObjectHelper.before(remainder, ":");
             String pattern = ObjectHelper.after(remainder, ":");
             return ExpressionBuilder.dateExpression(command, pattern);
         }

         // bean: prefix
         remainder = ifStartsWithReturnRemainder("bean:", expression);
         if (remainder != null) {
             return ExpressionBuilder.beanExpression(remainder);
         }

         // properties: prefix
         remainder = ifStartsWithReturnRemainder("properties:", expression);
         if (remainder != null) {
             String[] parts = remainder.split(":");
             if (parts.length > 2) {
                 throw new ExpressionIllegalSyntaxException("Valid syntax: ${properties:[locations]:key} was: " + expression);
             }

             String locations = null;
             String key = remainder;
             if (parts.length == 2) {
                 locations = ObjectHelper.before(remainder, ":");
                 key = ObjectHelper.after(remainder, ":");
             }
             return ExpressionBuilder.propertiesComponentExpression(key, locations);
         }

         // ref: prefix
         remainder = ifStartsWithReturnRemainder("ref:", expression);
         if (remainder != null) {
             return ExpressionBuilder.refExpression(remainder);
         }

         if (strict) {
             throw new ExpressionIllegalSyntaxException(expression);
         } else {
             return ExpressionBuilder.constantExpression(expression);
         }
     }

     protected Expression createSimpleFileExpression(String remainder) {
         if (ObjectHelper.equal(remainder, "name")) {
             return ExpressionBuilder.fileNameExpression();
         } else if (ObjectHelper.equal(remainder, "name.noext")) {
             return ExpressionBuilder.fileNameNoExtensionExpression();
         } else if (ObjectHelper.equal(remainder, "name.ext")) {
             return ExpressionBuilder.fileExtensionExpression();
         } else if (ObjectHelper.equal(remainder, "onlyname")) {
             return ExpressionBuilder.fileOnlyNameExpression();
         } else if (ObjectHelper.equal(remainder, "onlyname.noext")) {
             return ExpressionBuilder.fileOnlyNameNoExtensionExpression();
         } else if (ObjectHelper.equal(remainder, "ext")) {
             return ExpressionBuilder.fileExtensionExpression();
         } else if (ObjectHelper.equal(remainder, "parent")) {
             return ExpressionBuilder.fileParentExpression();
         } else if (ObjectHelper.equal(remainder, "path")) {
             return ExpressionBuilder.filePathExpression();
         } else if (ObjectHelper.equal(remainder, "absolute")) {
             return ExpressionBuilder.fileAbsoluteExpression();
         } else if (ObjectHelper.equal(remainder, "absolute.path")) {
             return ExpressionBuilder.fileAbsolutePathExpression();
         } else if (ObjectHelper.equal(remainder, "length") || ObjectHelper.equal(remainder, "size")) {
             return ExpressionBuilder.fileSizeExpression();
         } else if (ObjectHelper.equal(remainder, "modified")) {
             return ExpressionBuilder.fileLastModifiedExpression();
         }
         throw new ExpressionIllegalSyntaxException("File language syntax: " + remainder);
     }

 }
	/**
	* 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.language.simple;

	import org.apache.camel.Expression;
	import org.apache.camel.ExpressionIllegalSyntaxException;
	import org.apache.camel.builder.ExpressionBuilder;
	import org.apache.camel.util.ObjectHelper;
	import org.apache.camel.util.OgnlHelper;
	import org.apache.camel.util.StringHelper;

	/**
	* A <a href="http://camel.apache.org/simple.html">simple language</a>
	* which maps simple property style notations to access headers and bodies.
	* Examples of supported expressions are:
	* <ul>
	* <li>exchangeId to access the exchange id</li>
	* <li>id to access the inbound message id</li>
	* <li>in.body or body to access the inbound body</li>
	* <li>in.body.OGNL or body.OGNL to access the inbound body using an OGNL expression</li>
	* <li>mandatoryBodyAs(<classname>) to convert the in body to the given type, will throw exception if not possible to convert</li>
	* <li>bodyAs(<classname>) to convert the in body to the given type, will return null if not possible to convert</li>
	* <li>headerAs(<key>, <classname>) to convert the in header to the given type, will return null if not possible to convert</li>
	* <li>out.body to access the inbound body</li>
	* <li>in.header.foo or header.foo to access an inbound header called 'foo'</li>
	* <li>in.header.foo[bar] or header.foo[bar] to access an inbound header called 'foo' as a Map and lookup the map with 'bar' as key</li>
	* <li>in.header.foo.OGNL or header.OGNL to access an inbound header called 'foo' using an OGNL expression</li>
	* <li>out.header.foo to access an outbound header called 'foo'</li>
	* <li>property.foo to access the exchange property called 'foo'</li>
	* <li>property.foo.OGNL to access the exchange property called 'foo' using an OGNL expression</li>
	* <li>sys.foo to access the system property called 'foo'</li>
	* <li>sysenv.foo to access the system environment called 'foo'</li>
	* <li>exception.messsage to access the exception message</li>
	* <li>threadName to access the current thread name</li>
	* <li>date:<command>:<pattern> for date formatting using the {@link java.text.SimpleDateFormat} patterns.
	* Supported commands are: <tt>now</tt> for current timestamp,
	* <tt>in.header.xxx</tt> or <tt>header.xxx</tt> to use the Date object in the in header.
	* <tt>out.header.xxx</tt> to use the Date object in the out header.
	* </li>
	* <li>bean:<bean expression> to invoke a bean using the
	* {@link org.apache.camel.language.bean.BeanLanguage BeanLanguage}</li>
	* <li>properties:<[locations]>:<key> for using property placeholders using the
	* {@link org.apache.camel.component.properties.PropertiesComponent}.
	* The locations parameter is optional and you can enter multiple locations separated with comma.
	* </li>
	* </ul>
	* <p/>
	* The simple language supports OGNL notation when accessing either body or header.
	* <p/>
	* The simple language now also includes file language out of the box which means the following expression is also
	* supported:
	* <ul>
	* <li><tt>file:name</tt> to access the file name (is relative, see note below))</li>
	* <li><tt>file:name.noext</tt> to access the file name with no extension</li>
	* <li><tt>file:name.ext</tt> to access the file extension</li>
	* <li><tt>file:ext</tt> to access the file extension</li>
	* <li><tt>file:onlyname</tt> to access the file name (no paths)</li>
	* <li><tt>file:onlyname.noext</tt> to access the file name (no paths) with no extension </li>
	* <li><tt>file:parent</tt> to access the parent file name</li>
	* <li><tt>file:path</tt> to access the file path name</li>
	* <li><tt>file:absolute</tt> is the file regarded as absolute or relative</li>
	* <li><tt>file:absolute.path</tt> to access the absolute file path name</li>
	* <li><tt>file:length</tt> to access the file length as a Long type</li>
	* <li><tt>file:size</tt> to access the file length as a Long type</li>
	* <li><tt>file:modified</tt> to access the file last modified as a Date type</li>
	* <li><tt>date:<command>:<pattern></tt> for date formatting using the {@link java.text.SimpleDateFormat} patterns.
	* Additional Supported commands are: <tt>file</tt> for the last modified timestamp of the file.
	* All the commands from {@link SimpleLanguage} is also available.
	* </li>
	* </ul>
	* The <b>relative</b> file is the filename with the starting directory clipped, as opposed to <b>path</b> that will
	* return the full path including the starting directory.
	* <br/>
	* The <b>only</b> file is the filename only with all paths clipped.
	*
	* @version
	*/
	public class SimpleLanguage extends SimpleLanguageSupport {

	// singleton for expressions without a result type
	private static final SimpleLanguage SIMPLE = new SimpleLanguage();

	private Class<?> resultType;

	public Class<?> getResultType() {
	return resultType;
	}

	public void setResultType(Class<?> resultType) {
	this.resultType = resultType;
	}

	@Override
	public boolean isSingleton() {
	// we cannot be singleton as we have state
	return false;
	}

	@Override
	public Expression createExpression(String expression) {
	Expression answer = super.createExpression(expression);
	if (resultType != null) {
	return ExpressionBuilder.convertToExpression(answer, resultType);
	}
	return answer;
	}

	/**
	* Does the expression have the simple language start token?
	*
	* @param expression the expression
	* @return <tt>true</tt> if the expression contains the start token, <tt>false</tt> otherwise
	*/
	public static boolean hasStartToken(String expression) {
	if (expression == null) {
	return false;
	}

	return expression.indexOf("${") >= 0 \|\| expression.indexOf("$simple{") >= 0;
	}

	public static Expression simple(String expression) {
	return SIMPLE.createExpression(expression);
	}

	public static Expression simple(String expression, Class<?> resultType) {
	SimpleLanguage answer = new SimpleLanguage();
	answer.setResultType(resultType);
	return answer.createExpression(expression);
	}

	protected Expression createSimpleExpressionDirectly(String expression) {

	if (ObjectHelper.isEqualToAny(expression, "body", "in.body")) {
	return ExpressionBuilder.bodyExpression();
	} else if (ObjectHelper.equal(expression, "out.body")) {
	return ExpressionBuilder.outBodyExpression();
	} else if (ObjectHelper.equal(expression, "id")) {
	return ExpressionBuilder.messageIdExpression();
	} else if (ObjectHelper.equal(expression, "exchangeId")) {
	return ExpressionBuilder.exchangeIdExpression();
	} else if (ObjectHelper.equal(expression, "exception")) {
	return ExpressionBuilder.exchangeExceptionExpression();
	} else if (ObjectHelper.equal(expression, "exception.message")) {
	return ExpressionBuilder.exchangeExceptionMessageExpression();
	} else if (ObjectHelper.equal(expression, "exception.stacktrace")) {
	return ExpressionBuilder.exchangeExceptionStackTraceExpression();
	} else if (ObjectHelper.equal(expression, "threadName")) {
	return ExpressionBuilder.threadNameExpression();
	}

	return null;
	}

	protected Expression createSimpleExpression(String expression, boolean strict) {

	// return the expression directly if we can create expression without analyzing the prefix
	Expression answer = createSimpleExpressionDirectly(expression);
	if (answer != null) {
	return answer;
	}

	// bodyAs
	String remainder = ifStartsWithReturnRemainder("bodyAs", expression);
	if (remainder != null) {
	String type = ObjectHelper.between(remainder, "(", ")");
	if (type == null) {
	throw new ExpressionIllegalSyntaxException("Valid syntax: ${bodyAs(type)} was: " + expression);
	}
	type = StringHelper.removeQuotes(type);
	return ExpressionBuilder.bodyExpression(type);
	}
	// mandatoryBodyAs
	remainder = ifStartsWithReturnRemainder("mandatoryBodyAs", expression);
	if (remainder != null) {
	String type = ObjectHelper.between(remainder, "(", ")");
	if (type == null) {
	throw new ExpressionIllegalSyntaxException("Valid syntax: ${mandatoryBodyAs(type)} was: " + expression);
	}
	type = StringHelper.removeQuotes(type);
	return ExpressionBuilder.mandatoryBodyExpression(type);
	}

	// body OGNL
	remainder = ifStartsWithReturnRemainder("body", expression);
	if (remainder == null) {
	remainder = ifStartsWithReturnRemainder("in.body", expression);
	}
	if (remainder != null) {
	boolean invalid = OgnlHelper.isInvalidValidOgnlExpression(remainder);
	if (invalid) {
	throw new ExpressionIllegalSyntaxException("Valid syntax: ${body.OGNL} was: " + expression);
	}
	return ExpressionBuilder.bodyOgnlExpression(remainder);
	}

	// Exception OGNL
	remainder = ifStartsWithReturnRemainder("exception", expression);
	if (remainder != null) {
	boolean invalid = OgnlHelper.isInvalidValidOgnlExpression(remainder);
	if (invalid) {
	throw new ExpressionIllegalSyntaxException("Valid syntax: ${exception.OGNL} was: " + expression);
	}
	return ExpressionBuilder.exchangeExceptionOgnlExpression(remainder);
	}

	// headerAs
	remainder = ifStartsWithReturnRemainder("headerAs", expression);
	if (remainder != null) {
	String keyAndType = ObjectHelper.between(remainder, "(", ")");
	if (keyAndType == null) {
	throw new ExpressionIllegalSyntaxException("Valid syntax: ${headerAs(key, type)} was: " + expression);
	}

	String key = ObjectHelper.before(keyAndType, ",");
	String type = ObjectHelper.after(keyAndType, ",");
	if (ObjectHelper.isEmpty(key) \|\| ObjectHelper.isEmpty(type)) {
	throw new ExpressionIllegalSyntaxException("Valid syntax: ${headerAs(key, type)} was: " + expression);
	}
	key = StringHelper.removeQuotes(key);
	type = StringHelper.removeQuotes(type);
	return ExpressionBuilder.headerExpression(key, type);
	}

	// in header expression
	remainder = ifStartsWithReturnRemainder("in.headers", expression);
	if (remainder == null) {
	remainder = ifStartsWithReturnRemainder("in.header", expression);
	}
	if (remainder == null) {
	remainder = ifStartsWithReturnRemainder("headers", expression);
	}
	if (remainder == null) {
	remainder = ifStartsWithReturnRemainder("header", expression);
	}
	if (remainder != null) {
	// remove leading character (dot or ?)
	remainder = remainder.substring(1);

	// validate syntax
	boolean invalid = OgnlHelper.isInvalidValidOgnlExpression(remainder);
	if (invalid) {
	throw new ExpressionIllegalSyntaxException("Valid syntax: ${header.name[key]} was: " + expression);
	}

	if (OgnlHelper.isValidOgnlExpression(remainder)) {
	// ognl based header
	return ExpressionBuilder.headersOgnlExpression(remainder);
	} else {
	// regular header
	return ExpressionBuilder.headerExpression(remainder);
	}
	}

	// out header expression
	remainder = ifStartsWithReturnRemainder("out.header.", expression);
	if (remainder == null) {
	remainder = ifStartsWithReturnRemainder("out.headers.", expression);
	}
	if (remainder != null) {
	return ExpressionBuilder.outHeaderExpression(remainder);
	}

	// property
	remainder = ifStartsWithReturnRemainder("property", expression);
	if (remainder != null) {
	// remove leading character (dot or ?)
	remainder = remainder.substring(1);

	// validate syntax
	boolean invalid = OgnlHelper.isInvalidValidOgnlExpression(remainder);
	if (invalid) {
	throw new ExpressionIllegalSyntaxException("Valid syntax: ${property.OGNL} was: " + expression);
	}

	if (OgnlHelper.isValidOgnlExpression(remainder)) {
	// ognl based property
	return ExpressionBuilder.propertyOgnlExpression(remainder);
	} else {
	// regular property
	return ExpressionBuilder.propertyExpression(remainder);
	}
	}

	// system property
	remainder = ifStartsWithReturnRemainder("sys.", expression);
	if (remainder != null) {
	return ExpressionBuilder.systemPropertyExpression(remainder);
	}

	// system property
	remainder = ifStartsWithReturnRemainder("sysenv.", expression);
	if (remainder != null) {
	return ExpressionBuilder.systemEnvironmentExpression(remainder);
	}

	// file: prefix
	remainder = ifStartsWithReturnRemainder("file:", expression);
	if (remainder != null) {
	Expression fileExpression = createSimpleFileExpression(remainder);
	if (expression != null) {
	return fileExpression;
	}
	}

	// date: prefix
	remainder = ifStartsWithReturnRemainder("date:", expression);
	if (remainder != null) {
	String[] parts = remainder.split(":");
	if (parts.length < 2) {
	throw new ExpressionIllegalSyntaxException("Valid syntax: ${date:command:pattern} was: " + expression);
	}
	String command = ObjectHelper.before(remainder, ":");
	String pattern = ObjectHelper.after(remainder, ":");
	return ExpressionBuilder.dateExpression(command, pattern);
	}

	// bean: prefix
	remainder = ifStartsWithReturnRemainder("bean:", expression);
	if (remainder != null) {
	return ExpressionBuilder.beanExpression(remainder);
	}

	// properties: prefix
	remainder = ifStartsWithReturnRemainder("properties:", expression);
	if (remainder != null) {
	String[] parts = remainder.split(":");
	if (parts.length > 2) {
	throw new ExpressionIllegalSyntaxException("Valid syntax: ${properties:[locations]:key} was: " + expression);
	}

	String locations = null;
	String key = remainder;
	if (parts.length == 2) {
	locations = ObjectHelper.before(remainder, ":");
	key = ObjectHelper.after(remainder, ":");
	}
	return ExpressionBuilder.propertiesComponentExpression(key, locations);
	}

	// ref: prefix
	remainder = ifStartsWithReturnRemainder("ref:", expression);
	if (remainder != null) {
	return ExpressionBuilder.refExpression(remainder);
	}

	if (strict) {
	throw new ExpressionIllegalSyntaxException(expression);
	} else {
	return ExpressionBuilder.constantExpression(expression);
	}
	}

	protected Expression createSimpleFileExpression(String remainder) {
	if (ObjectHelper.equal(remainder, "name")) {
	return ExpressionBuilder.fileNameExpression();
	} else if (ObjectHelper.equal(remainder, "name.noext")) {
	return ExpressionBuilder.fileNameNoExtensionExpression();
	} else if (ObjectHelper.equal(remainder, "name.ext")) {
	return ExpressionBuilder.fileExtensionExpression();
	} else if (ObjectHelper.equal(remainder, "onlyname")) {
	return ExpressionBuilder.fileOnlyNameExpression();
	} else if (ObjectHelper.equal(remainder, "onlyname.noext")) {
	return ExpressionBuilder.fileOnlyNameNoExtensionExpression();
	} else if (ObjectHelper.equal(remainder, "ext")) {
	return ExpressionBuilder.fileExtensionExpression();
	} else if (ObjectHelper.equal(remainder, "parent")) {
	return ExpressionBuilder.fileParentExpression();
	} else if (ObjectHelper.equal(remainder, "path")) {
	return ExpressionBuilder.filePathExpression();
	} else if (ObjectHelper.equal(remainder, "absolute")) {
	return ExpressionBuilder.fileAbsoluteExpression();
	} else if (ObjectHelper.equal(remainder, "absolute.path")) {
	return ExpressionBuilder.fileAbsolutePathExpression();
	} else if (ObjectHelper.equal(remainder, "length") \|\| ObjectHelper.equal(remainder, "size")) {
	return ExpressionBuilder.fileSizeExpression();
	} else if (ObjectHelper.equal(remainder, "modified")) {
	return ExpressionBuilder.fileLastModifiedExpression();
	}
	throw new ExpressionIllegalSyntaxException("File language syntax: " + remainder);
	}

	}