io.wcm.tooling.netbeans.sightly.completion.classLookup.RequestAttributeResolver.java Source code

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Here is the source code for io.wcm.tooling.netbeans.sightly.completion.classLookup.RequestAttributeResolver.java

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/*
 * #%L
 * wcm.io
 * %%
 * Copyright (C) 2014 wcm.io
 * %%
 * Licensed 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.
 * #L%
 */
package io.wcm.tooling.netbeans.sightly.completion.classLookup;

import java.lang.annotation.Annotation;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.LinkedHashSet;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.lang.model.element.AnnotationMirror;
import javax.lang.model.element.Element;
import javax.lang.model.type.TypeMirror;
import org.apache.commons.lang.StringUtils;
import org.netbeans.api.java.classpath.ClassPath;
import org.netbeans.api.java.source.ElementUtilities;

/**
 * resolves all request-attributes of a given class
 */
public class RequestAttributeResolver extends AbstractSourceResolver {

    private static final Logger LOGGER = Logger.getLogger(RequestAttributeResolver.class.getName());

    private static final String REQUEST_ATTRIBUTE_CLASSNAME = "org.apache.sling.models.annotations.injectorspecific.RequestAttribute";

    private final String text;

    public RequestAttributeResolver(String text, ClassPath classPath) {
        super(classPath);
        this.text = text;
    }

    public Set<String> resolve(String filter) {
        Set<String> ret = new LinkedHashSet<>();
        // only display results if filter contains @
        if (!StringUtils.contains(text, "@") || !StringUtils.contains(text, "data-sly-use")) {
            return ret;
        }
        ElementUtilities.ElementAcceptor acceptor = new ElementUtilities.ElementAcceptor() {
            @Override
            public boolean accept(Element e, TypeMirror type) {
                // we are looking for the annotations
                for (AnnotationMirror mirror : e.getAnnotationMirrors()) {
                    if (mirror.getAnnotationType() != null && mirror.getAnnotationType().asElement() != null
                            && StringUtils.equalsIgnoreCase(REQUEST_ATTRIBUTE_CLASSNAME,
                                    mirror.getAnnotationType().asElement().toString())) {
                        return true;
                    }
                }
                return false;
            }
        };
        String clazz = StringUtils.substringBetween(text, "'");

        Set<Element> elems = getMembersFromJavaSource(clazz, acceptor);
        for (Element elem : elems) {
            if (StringUtils.startsWithIgnoreCase(elem.getSimpleName().toString(), filter)
                    && !StringUtils.contains(text, elem.getSimpleName().toString() + " ")
                    && !StringUtils.contains(text, elem.getSimpleName().toString() + "=")) {
                ret.add(elem.getSimpleName().toString());
            }
        }
        if (ret.isEmpty()) {
            for (String att : getAttributesFromClassLoader(clazz)) {
                if (StringUtils.startsWithIgnoreCase(att, filter) && !StringUtils.contains(text, att + " ")
                        && !StringUtils.contains(text, att + "=")) {
                    ret.add(att);
                }
            }
        }
        return ret;
    }

    private Set<String> getAttributesFromClassLoader(String clazzname) {
        final Set<String> ret = new LinkedHashSet<>();
        try {
            Class clazz = classPath.getClassLoader(true).loadClass(clazzname);
            for (Method method : clazz.getDeclaredMethods()) {
                for (Annotation annotation : method.getAnnotations()) {
                    if (annotation.annotationType().getName().equals(REQUEST_ATTRIBUTE_CLASSNAME)) {
                        ret.add(method.getName());
                    }
                }
            }
            for (Field field : clazz.getDeclaredFields()) {
                for (Annotation annotation : field.getAnnotations()) {
                    if (annotation.annotationType().getName().equals(REQUEST_ATTRIBUTE_CLASSNAME)) {
                        ret.add(field.getName());
                    }
                }
            }
        } catch (ClassNotFoundException cnfe) {
            LOGGER.log(Level.FINE, "Could not resolve class " + clazzname, cnfe);
        }
        return ret;
    }

}