org.apache.sling.commons.proxy.impl.to.InvokedTOFactory.java Source code

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Here is the source code for org.apache.sling.commons.proxy.impl.to.InvokedTOFactory.java

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/*
 * 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.sling.commons.proxy.impl.to;

import java.lang.reflect.Method;

import org.apache.commons.lang.StringUtils;
import org.apache.sling.commons.proxy.annotations.SlingChildren;
import org.apache.sling.commons.proxy.annotations.SlingProperty;
import org.apache.sling.commons.proxy.annotations.SlingReference;
import org.apache.sling.commons.proxy.impl.lang.MethodType;
import org.apache.sling.commons.proxy.impl.reflection.Annotations;

/**
 * Generates instances of InvokedTO's, based on the annotations available on the
 * method, this will return the correct transfer object type.
 */
public class InvokedTOFactory {

    /**
     * Instantiates a new InvokedTO Object. This object will contain the
     * relevant invocation properties for the method invocation
     * 
     * @param proxy
     *            the proxy object
     * @param method
     *            the invoked method
     * @param args
     *            the method arguments
     * @return the invocation TO
     */
    public static InvokedTO newInstance(final Object proxy, final Method method, final Object[] args) {

        final MethodType mt = MethodType.getMethodType(method);
        if (mt.equals(MethodType.BackingResource) || mt.equals(MethodType.Equals) || mt.equals(MethodType.HashCode)
                || mt.equals(MethodType.ToString)) {
            return new BaseInvokedTO(method, "", mt);
        } else if (Annotations.methodHasAnnotation(method, SlingReference.class)) {
            final SlingReference sr = method.getAnnotation(SlingReference.class);

            final String path = StringUtils.trim(sr.path());

            return new BaseInvokedTO(method, path, mt);
        } else if (Annotations.methodHasAnnotation(method, SlingChildren.class)) {
            final SlingChildren sc = method.getAnnotation(SlingChildren.class);
            final String path = StringUtils.trim(sc.path());
            final Class<?> returnType = sc.returnType();

            return new InvokedChildrenTO(method, args, path, returnType, mt);
        } else {
            final SlingProperty sp = method.getAnnotation(SlingProperty.class);
            if (sp == null) {
                throw new java.lang.IllegalStateException("Method " + method.getName() + " on class "
                        + method.getClass().getCanonicalName() + " does not have required annotations");
            }

            final String path = StringUtils.trim(sp.path());
            final String name = StringUtils.trim(sp.name());

            String property = (path.length() > 0 ? path + "/" : path) + name;
            if ((property == null) || (property.length() < 1)) {
                property = MethodType.getBeanName(mt, method);
                property = property.replace("_", ":");
            }
            if ((property == null) || (property.length() < 1)) {
                final String msg = "Could not determine Bean Property name either from @SlingProperty annotation or the JavaBean method name.";
                throw new IllegalStateException(msg);
            }

            return new InvokedPropertyTO(method, args, path, name, mt);
        }

    }

}