Example usage for java.util.concurrent ConcurrentNavigableMap isEmpty

Introduction

In this page you can find the example usage for java.util.concurrent ConcurrentNavigableMap isEmpty.

Prototype

boolean isEmpty();

Source Link

Document

Returns true if this map contains no key-value mappings.

Usage

From source file:org.apache.sling.models.impl.AdapterImplementations.java

/**
 * Remove implementation mapping for the given adapter type.
 * @param adapterTypeName Adapter type name
 * @param implTypeName Implementation type name
 *//*from   w  w  w .ja  v  a 2 s  . c o m*/
public void remove(String adapterTypeName, String implTypeName) {
    String key = adapterTypeName;
    if (StringUtils.equals(adapterTypeName, implTypeName)) {
        modelClasses.remove(key);
    } else {
        // although we already use a ConcurrentMap synchronize explicitly because we apply non-atomic operations on it
        synchronized (adapterImplementations) {
            ConcurrentNavigableMap<String, ModelClass<?>> implementations = adapterImplementations.get(key);
            if (implementations != null) {
                implementations.remove(implTypeName);
                if (implementations.isEmpty()) {
                    adapterImplementations.remove(key);
                }
            }
        }
    }
}

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From source file:org.apache.sling.models.impl.AdapterImplementations.java

/**
 * Lookup the best-matching implementation for the given adapter type by enquiring the {@link ImplementationPicker} services.
 * @param adapterType Adapter type//from  ww  w  .  j ava 2  s.co m
 * @param adaptable Adaptable for reference
 * @return Implementation type or null if none detected
 */
@SuppressWarnings("unchecked")
public <ModelType> ModelClass<ModelType> lookup(Class<ModelType> adapterType, Object adaptable) {
    String key = adapterType.getName();

    // lookup in cache for models without adapter classes
    ModelClass<ModelType> modelClass = (ModelClass<ModelType>) modelClasses.get(key);
    if (modelClass != null) {
        return modelClass;
    }

    // not found? look in cache with adapter classes
    ConcurrentNavigableMap<String, ModelClass<?>> implementations = adapterImplementations.get(key);
    if (implementations == null || implementations.isEmpty()) {
        return null;
    }
    Collection<ModelClass<?>> implementationsCollection = implementations.values();
    ModelClass<?>[] implementationWrappersArray = implementationsCollection
            .toArray(new ModelClass<?>[implementationsCollection.size()]);

    // prepare array for implementation picker
    Class<?>[] implementationsArray = new Class<?>[implementationsCollection.size()];
    for (int i = 0; i < implementationWrappersArray.length; i++) {
        implementationsArray[i] = implementationWrappersArray[i].getType();
    }

    for (ImplementationPicker picker : this.sortedImplementationPickers) {
        Class<?> implementation = picker.pick(adapterType, implementationsArray, adaptable);
        if (implementation != null) {
            for (int i = 0; i < implementationWrappersArray.length; i++) {
                if (implementation == implementationWrappersArray[i].getType()) {
                    return (ModelClass<ModelType>) implementationWrappersArray[i];
                }
            }
        }
    }

    return null;
}

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From source file:org.apache.sling.models.impl.AdapterImplementations.java

/**
 * @param adapterType the type to check/*from   w  w  w. j a v  a  2  s  .  c  o  m*/
 * @return {@code true} in case the given type is a model (may be with a different adapter class)
 */
@SuppressWarnings("unchecked")
public <ModelType> boolean isModelClass(Class<ModelType> adapterType) {
    String key = adapterType.getName();

    // lookup in cache for models without adapter classes
    ModelClass<ModelType> modelClass = (ModelClass<ModelType>) modelClasses.get(key);
    if (modelClass != null) {
        return true;
    }

    // not found? look in cache with adapter classes
    ConcurrentNavigableMap<String, ModelClass<?>> implementations = adapterImplementations.get(key);
    if (implementations == null || implementations.isEmpty()) {
        return false;
    }
    return true;
}

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