Example usage for java.lang.reflect Constructor getAnnotation

Introduction

In this page you can find the example usage for java.lang.reflect Constructor getAnnotation.

Prototype

public <T extends Annotation> T getAnnotation(Class<T> annotationClass) 

Source Link

Usage

From source file:io.milton.config.HttpManagerBuilder.java

private Object createObject(Class c) throws CreationException {
    log.info("createObject: {}", c.getCanonicalName());
    // Look for an @Inject or default constructor
    Constructor found = null;/*from   w w  w .  j  a va2 s .  c  o m*/

    for (Constructor con : c.getConstructors()) {
        Annotation[][] paramTypes = con.getParameterAnnotations();
        if (paramTypes != null && paramTypes.length > 0) {
            Annotation inject = con.getAnnotation(Inject.class);
            if (inject != null) {
                found = con;
            }
        } else {
            found = con;
        }
    }
    if (found == null) {
        throw new RuntimeException(
                "Could not find a default or @Inject constructor for class: " + c.getCanonicalName());
    }
    Object args[] = new Object[found.getParameterTypes().length];
    int i = 0;
    for (Class paramType : found.getParameterTypes()) {
        try {
            args[i++] = findOrCreateObject(paramType);
        } catch (CreationException ex) {
            throw new CreationException(c, ex);
        }
    }
    Object created;
    try {
        log.info("Creating: {}", c.getCanonicalName());
        created = found.newInstance(args);
        rootContext.put(created);
    } catch (InstantiationException ex) {
        throw new CreationException(c, ex);
    } catch (IllegalAccessException ex) {
        throw new CreationException(c, ex);
    } catch (IllegalArgumentException ex) {
        throw new CreationException(c, ex);
    } catch (InvocationTargetException ex) {
        throw new CreationException(c, ex);
    }
    // Now look for @Inject fields
    for (Field field : c.getDeclaredFields()) {
        Inject anno = field.getAnnotation(Inject.class);
        if (anno != null) {
            boolean acc = field.isAccessible();
            try {
                field.setAccessible(true);
                field.set(created, findOrCreateObject(field.getType()));
            } catch (IllegalArgumentException ex) {
                throw new CreationException(field, c, ex);
            } catch (IllegalAccessException ex) {
                throw new CreationException(field, c, ex);
            } finally {
                field.setAccessible(acc); // put back the way it was
            }
        }
    }

    // Finally set any @Inject methods
    for (Method m : c.getMethods()) {
        Inject anno = m.getAnnotation(Inject.class);
        if (anno != null) {
            Object[] methodArgs = new Object[m.getParameterTypes().length];
            int ii = 0;
            try {
                for (Class<?> paramType : m.getParameterTypes()) {
                    methodArgs[ii++] = findOrCreateObject(paramType);
                }
                m.invoke(created, methodArgs);
            } catch (CreationException creationException) {
                throw new CreationException(m, c, creationException);
            } catch (IllegalAccessException ex) {
                throw new CreationException(m, c, ex);
            } catch (IllegalArgumentException ex) {
                throw new CreationException(m, c, ex);
            } catch (InvocationTargetException ex) {
                throw new CreationException(m, c, ex);
            }
        }
    }
    if (created instanceof InitListener) {
        if (listeners == null) {
            listeners = new ArrayList<InitListener>();
        }
        InitListener l = (InitListener) created;
        l.beforeInit(this); // better late then never!!
        listeners.add(l);
    }
    return created;
}

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From source file:org.jvnet.hudson.test.JenkinsRule.java

public Constructor<?> findDataBoundConstructor(Class<?> c) {
    for (Constructor<?> m : c.getConstructors()) {
        if (m.getAnnotation(DataBoundConstructor.class) != null)
            return m;
    }//from  w w w .  ja v  a2  s  .c  o m
    return null;
}

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