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package org.apache.camel.component.bean; |
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import java.lang.annotation.Annotation; |
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import java.lang.reflect.Method; |
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import java.lang.reflect.Modifier; |
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import java.util.ArrayList; |
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import java.util.Arrays; |
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import java.util.Collection; |
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import java.util.List; |
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import java.util.Map; |
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import java.util.concurrent.ConcurrentHashMap; |
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import org.apache.camel.Body; |
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import org.apache.camel.Exchange; |
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import org.apache.camel.Expression; |
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import org.apache.camel.Header; |
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import org.apache.camel.Message; |
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import org.apache.camel.Property; |
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import org.apache.camel.RuntimeCamelException; |
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import org.apache.camel.builder.ExpressionBuilder; |
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import org.apache.commons.logging.Log; |
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import org.apache.commons.logging.LogFactory; |
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import static org.apache.camel.util.ExchangeHelper.convertToType; |
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public class BeanInfo { |
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private static final transient Log LOG = LogFactory.getLog(BeanInfo.class); |
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private Class type; |
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private ParameterMappingStrategy strategy; |
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private Map<String, MethodInfo> operations = new ConcurrentHashMap<String, MethodInfo>(); |
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private MethodInfo defaultMethod; |
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private List<MethodInfo> operationsWithBody = new ArrayList<MethodInfo>(); |
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public BeanInfo(Class type, ParameterMappingStrategy strategy) { |
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this.type = type; |
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this.strategy = strategy; |
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introspect(getType()); |
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if (operations.size() == 1) { |
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Collection<MethodInfo> methodInfos = operations.values(); |
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for (MethodInfo methodInfo : methodInfos) { |
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defaultMethod = methodInfo; |
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} |
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} |
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} |
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public Class getType() { |
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return type; |
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} |
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public MethodInvocation createInvocation(Method method, Object pojo, Exchange exchange) |
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throws RuntimeCamelException { |
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MethodInfo methodInfo = introspect(type, method); |
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if (methodInfo != null) { |
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return methodInfo.createMethodInvocation(pojo, exchange); |
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} |
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return null; |
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} |
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public MethodInvocation createInvocation(Object pojo, Exchange exchange) throws RuntimeCamelException, |
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AmbiguousMethodCallException { |
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MethodInfo methodInfo = null; |
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String name = exchange.getIn().getHeader(BeanProcessor.METHOD_NAME, String.class); |
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if (name != null) { |
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methodInfo = operations.get(name); |
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} |
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if (methodInfo == null) { |
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methodInfo = chooseMethod(pojo, exchange); |
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} |
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if (methodInfo == null) { |
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methodInfo = defaultMethod; |
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} |
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if (methodInfo != null) { |
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return methodInfo.createMethodInvocation(pojo, exchange); |
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} |
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return null; |
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} |
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protected void introspect(Class clazz) { |
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Method[] methods = clazz.getDeclaredMethods(); |
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for (Method method : methods) { |
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if (isValidMethod(clazz, method)) { |
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introspect(clazz, method); |
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} |
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} |
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Class superclass = clazz.getSuperclass(); |
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if (superclass != null && !superclass.equals(Object.class)) { |
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introspect(superclass); |
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} |
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} |
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protected MethodInfo introspect(Class clazz, Method method) { |
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Class[] parameterTypes = method.getParameterTypes(); |
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Annotation[][] parametersAnnotations = method.getParameterAnnotations(); |
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final Expression[] parameterExpressions = new Expression[parameterTypes.length]; |
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List<ParameterInfo> parameters = new ArrayList<ParameterInfo>(); |
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List<ParameterInfo> bodyParameters = new ArrayList<ParameterInfo>(); |
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for (int i = 0; i < parameterTypes.length; i++) { |
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Class parameterType = parameterTypes[i]; |
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Annotation[] parameterAnnotations = parametersAnnotations[i]; |
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Expression expression = createParameterUnmarshalExpression(clazz, method, parameterType, |
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parameterAnnotations); |
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if (expression == null) { |
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if (parameterTypes.length == 1 && bodyParameters.isEmpty()) { |
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expression = ExpressionBuilder.bodyExpression(parameterType); |
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} else { |
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if (LOG.isDebugEnabled()) { |
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LOG.debug("No expression available for method: " + method.toString() |
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+ " which already has a body so ignoring parameter: " + i |
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+ " so ignoring method"); |
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} |
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return null; |
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} |
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} |
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ParameterInfo parameterInfo = new ParameterInfo(i, parameterType, parameterAnnotations, |
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expression); |
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parameters.add(parameterInfo); |
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if (isPossibleBodyParameter(parameterAnnotations)) { |
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bodyParameters.add(parameterInfo); |
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} |
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} |
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String opName = method.getName(); |
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MethodInfo methodInfo = new MethodInfo(clazz, method, parameters, bodyParameters); |
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operations.put(opName, methodInfo); |
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if (methodInfo.hasBodyParameter()) { |
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operationsWithBody.add(methodInfo); |
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} |
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return methodInfo; |
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} |
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protected MethodInfo chooseMethod(Object pojo, Exchange exchange) throws AmbiguousMethodCallException { |
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if (operationsWithBody.size() == 1) { |
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return operationsWithBody.get(0); |
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} else if (!operationsWithBody.isEmpty()) { |
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Message in = exchange.getIn(); |
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Object body = in.getBody(); |
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if (body != null) { |
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Class bodyType = body.getClass(); |
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List<MethodInfo> possibles = new ArrayList<MethodInfo>(); |
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for (MethodInfo methodInfo : operationsWithBody) { |
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if (methodInfo.bodyParameterMatches(bodyType)) { |
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possibles.add(methodInfo); |
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} |
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} |
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if (possibles.size() == 1) { |
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return possibles.get(0); |
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} else if (possibles.isEmpty()) { |
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Object newBody = null; |
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MethodInfo matched = null; |
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for (MethodInfo methodInfo : operationsWithBody) { |
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Object value = convertToType(exchange, methodInfo.getBodyParameterType(), body); |
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if (value != null) { |
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if (newBody != null) { |
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throw new AmbiguousMethodCallException(exchange, Arrays.asList(matched, |
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methodInfo)); |
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} else { |
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newBody = value; |
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matched = methodInfo; |
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} |
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} |
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} |
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if (matched != null) { |
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in.setBody(newBody); |
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return matched; |
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} |
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} else { |
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throw new AmbiguousMethodCallException(exchange, possibles); |
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} |
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} |
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return null; |
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} |
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return null; |
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} |
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protected Expression createParameterUnmarshalExpression(Class clazz, Method method, Class parameterType, |
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Annotation[] parameterAnnotation) { |
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for (Annotation annotation : parameterAnnotation) { |
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Expression answer = createParameterUnmarshalExpressionForAnnotation(clazz, method, parameterType, |
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annotation); |
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if (answer != null) { |
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return answer; |
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} |
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} |
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return strategy.getDefaultParameterTypeExpression(parameterType); |
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} |
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protected boolean isPossibleBodyParameter(Annotation[] annotations) { |
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if (annotations != null) { |
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for (Annotation annotation : annotations) { |
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if ((annotation instanceof Property) || (annotation instanceof Header)) { |
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return false; |
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} |
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} |
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} |
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return true; |
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} |
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protected Expression createParameterUnmarshalExpressionForAnnotation(Class clazz, Method method, |
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Class parameterType, |
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Annotation annotation) { |
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if (annotation instanceof Property) { |
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Property propertyAnnotation = (Property)annotation; |
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return ExpressionBuilder.propertyExpression(propertyAnnotation.name()); |
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} else if (annotation instanceof Header) { |
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Header headerAnnotation = (Header)annotation; |
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return ExpressionBuilder.headerExpression(headerAnnotation.name()); |
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} else if (annotation instanceof Body) { |
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Body content = (Body)annotation; |
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return ExpressionBuilder.bodyExpression(parameterType); |
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} |
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return null; |
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} |
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protected boolean isValidMethod(Class clazz, Method method) { |
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return Modifier.isPublic(method.getModifiers()); |
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} |
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} |