/**
* 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.language;
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 javax.xml.bind.annotation.XmlTransient;
import org.apache.camel.CamelContext;
import org.apache.camel.Expression;
import org.apache.camel.ExpressionIllegalSyntaxException;
import org.apache.camel.Predicate;
import org.apache.camel.component.bean.BeanHolder;
import org.apache.camel.component.bean.BeanInfo;
import org.apache.camel.component.bean.MethodNotFoundException;
import org.apache.camel.component.bean.RegistryBean;
import org.apache.camel.language.bean.BeanExpression;
import org.apache.camel.util.ObjectHelper;
import org.apache.camel.util.OgnlHelper;
/**
* For expressions and predicates using the
* <a href="http://camel.apache.org/bean-language.html">bean language</a>
*
* @version
*/
@XmlRootElement(name = "method")
@XmlAccessorType(XmlAccessType.FIELD)
public class MethodCallExpression extends ExpressionDefinition {
@XmlAttribute
@Deprecated
private String bean;
@XmlAttribute
private String ref;
@XmlAttribute
private String method;
@XmlAttribute(name = "beanType")
private String beanTypeName;
@XmlTransient
private Class<?> beanType;
@XmlTransient
private Object instance;
public MethodCallExpression() {
}
public MethodCallExpression(String beanName) {
this(beanName, null);
}
public MethodCallExpression(String beanName, String method) {
super(beanName);
this.method = method;
}
public MethodCallExpression(Object instance) {
this(instance, null);
}
public MethodCallExpression(Object instance, String method) {
super(ObjectHelper.className(instance));
// must use setter as they have special logic
setInstance(instance);
setMethod(method);
}
public MethodCallExpression(Class<?> type) {
this(type, null);
}
public MethodCallExpression(Class<?> type, String method) {
super(type.getName());
this.beanType = type;
this.method = method;
}
public String getLanguage() {
return "bean";
}
public String getBean() {
return bean;
}
public void setBean(String bean) {
this.bean = bean;
}
public String getRef() {
return ref;
}
public void setRef(String ref) {
this.ref = ref;
}
public String getMethod() {
return method;
}
public void setMethod(String method) {
this.method = method;
}
public Class<?> getBeanType() {
return beanType;
}
public void setBeanType(Class<?> beanType) {
this.beanType = beanType;
this.instance = null;
}
public String getBeanTypeName() {
return beanTypeName;
}
public void setBeanTypeName(String beanTypeName) {
this.beanTypeName = beanTypeName;
}
public Object getInstance() {
return instance;
}
public void setInstance(Object instance) {
// people may by mistake pass in a class type as the instance
if (instance instanceof Class) {
this.beanType = (Class<?>) instance;
this.instance = null;
} else {
this.beanType = null;
this.instance = instance;
}
}
@Override
public Expression createExpression(CamelContext camelContext) {
Expression answer;
if (beanType == null && beanTypeName != null) {
try {
beanType = camelContext.getClassResolver().resolveMandatoryClass(beanTypeName);
} catch (ClassNotFoundException e) {
throw ObjectHelper.wrapRuntimeCamelException(e);
}
}
if (beanType != null) {
// create a bean if there is a default public no-arg constructor
if (ObjectHelper.hasDefaultPublicNoArgConstructor(beanType)) {
instance = camelContext.getInjector().newInstance(beanType);
answer = new BeanExpression(instance, getMethod());
} else {
answer = new BeanExpression(beanType, getMethod());
}
} else if (instance != null) {
answer = new BeanExpression(instance, getMethod());
} else {
String ref = beanName();
// if its a ref then check that the ref exists
BeanHolder holder = new RegistryBean(camelContext, ref);
// get the bean which will check that it exists
instance = holder.getBean();
answer = new BeanExpression(instance, getMethod());
}
validateHasMethod(camelContext, instance, beanType, getMethod());
return answer;
}
@Override
public Predicate createPredicate(CamelContext camelContext) {
return (BeanExpression) createExpression(camelContext);
}
/**
* Validates the given bean has the method.
* <p/>
* This implementation will skip trying to validate OGNL method name expressions.
*
* @param context camel context
* @param bean the bean instance
* @param type the bean type
* @param method the method, can be <tt>null</tt> if no method name provided
* @throws org.apache.camel.RuntimeCamelException is thrown if bean does not have the method
*/
protected void validateHasMethod(CamelContext context, Object bean, Class<?> type, String method) {
if (method == null) {
return;
}
if (bean == null && type == null) {
throw new IllegalArgumentException("Either bean or type should be provided on " + this);
}
// do not try to validate ognl methods
if (OgnlHelper.isValidOgnlExpression(method)) {
return;
}
// if invalid OGNL then fail
if (OgnlHelper.isInvalidValidOgnlExpression(method)) {
ExpressionIllegalSyntaxException cause = new ExpressionIllegalSyntaxException(method);
throw ObjectHelper.wrapRuntimeCamelException(new MethodNotFoundException(bean != null ? bean : type, method, cause));
}
if (bean != null) {
BeanInfo info = new BeanInfo(context, bean.getClass());
if (!info.hasMethod(method)) {
throw ObjectHelper.wrapRuntimeCamelException(new MethodNotFoundException(null, bean, method));
}
} else {
BeanInfo info = new BeanInfo(context, type);
// must be a static method as we do not have a bean instance to invoke
if (!info.hasStaticMethod(method)) {
throw ObjectHelper.wrapRuntimeCamelException(new MethodNotFoundException(null, type, method, true));
}
}
}
protected String beanName() {
if (bean != null) {
return bean;
} else if (ref != null) {
return ref;
} else if (instance != null) {
return ObjectHelper.className(instance);
}
return getExpression();
}
@Override
public String toString() {
return "bean{" + beanName() + (method != null ? ", method=" + method : "") + "}";
}
}