/**
* 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 org.apache.camel.Expression;
import org.apache.camel.Predicate;
import org.apache.camel.builder.SimpleBuilder;
import org.apache.camel.builder.ValueBuilder;
import org.apache.camel.builder.xml.XPathBuilder;
import org.apache.camel.model.language.ExpressionDefinition;
import org.apache.camel.model.language.SimpleExpression;
import org.apache.camel.model.language.XPathExpression;
/**
* Helper for {@link ExpressionNode}
*/
public final class ExpressionNodeHelper {
private ExpressionNodeHelper() {
}
/**
* Determines which {@link ExpressionDefinition} describes the given expression best possible.
* <p/>
* This implementation will use types such as {@link SimpleExpression}, {@link XPathExpression} etc.
* if the given expression is detect as such a type.
*
* @param expression the expression
* @return a definition which describes the expression
*/
public static ExpressionDefinition toExpressionDefinition(Expression expression) {
if (expression instanceof SimpleBuilder) {
SimpleBuilder builder = (SimpleBuilder) expression;
// we keep the original expression by using the constructor that accepts an expression
SimpleExpression answer = new SimpleExpression(builder);
answer.setExpression(builder.getText());
answer.setResultType(builder.getResultType());
return answer;
} else if (expression instanceof XPathBuilder) {
XPathBuilder builder = (XPathBuilder) expression;
// we keep the original expression by using the constructor that accepts an expression
XPathExpression answer = new XPathExpression(builder);
answer.setExpression(builder.getText());
answer.setResultType(builder.getResultType());
return answer;
} else if (expression instanceof ValueBuilder) {
ValueBuilder builder = (ValueBuilder) expression;
expression = builder.getExpression();
}
if (expression instanceof ExpressionDefinition) {
return (ExpressionDefinition) expression;
}
return new ExpressionDefinition(expression);
}
/**
* Determines which {@link ExpressionDefinition} describes the given predicate best possible.
* <p/>
* This implementation will use types such as {@link SimpleExpression}, {@link XPathExpression} etc.
* if the given predicate is detect as such a type.
*
* @param predicate the predicate
* @return a definition which describes the predicate
*/
public static ExpressionDefinition toExpressionDefinition(Predicate predicate) {
if (predicate instanceof SimpleBuilder) {
SimpleBuilder builder = (SimpleBuilder) predicate;
// we keep the original expression by using the constructor that accepts an expression
SimpleExpression answer = new SimpleExpression(builder);
answer.setExpression(builder.getText());
return answer;
} else if (predicate instanceof XPathBuilder) {
XPathBuilder builder = (XPathBuilder) predicate;
// we keep the original expression by using the constructor that accepts an expression
XPathExpression answer = new XPathExpression(builder);
answer.setExpression(builder.getText());
return answer;
}
if (predicate instanceof ExpressionDefinition) {
return (ExpressionDefinition) predicate;
}
return new ExpressionDefinition(predicate);
}
}