Example usage for org.springframework.core CollectionFactory createCollection

Introduction

In this page you can find the example usage for org.springframework.core CollectionFactory createCollection.

Prototype

@SuppressWarnings({ "unchecked", "cast" })
public static <E> Collection<E> createCollection(Class<?> collectionType, @Nullable Class<?> elementType,
        int capacity) 

Source Link

Document

Create the most appropriate collection for the given collection type.

Usage

From source file:net.yasion.common.core.bean.wrapper.impl.ExtendedBeanWrapperImpl.java

private Object newValue(Class<?> type, TypeDescriptor desc, String name) {
    try {/*w  w w . j av a2 s . c o  m*/
        if (type.isArray()) {
            Class<?> componentType = type.getComponentType();
            // #TO#DO# - only handles 2-dimensional arrays
            if (componentType.isArray()) {
                Object array = Array.newInstance(componentType, 1);
                Array.set(array, 0, Array.newInstance(componentType.getComponentType(), 0));
                return array;
            } else {
                return Array.newInstance(componentType, 0);
            }
        } else if (Collection.class.isAssignableFrom(type)) {
            TypeDescriptor elementDesc = (desc != null ? desc.getElementTypeDescriptor() : null);
            return CollectionFactory.createCollection(type,
                    (elementDesc != null ? elementDesc.getType() : null), 16);
        } else if (Map.class.isAssignableFrom(type)) {
            TypeDescriptor keyDesc = (desc != null ? desc.getMapKeyTypeDescriptor() : null);
            return CollectionFactory.createMap(type, (keyDesc != null ? keyDesc.getType() : null), 16);
        } else {
            return type.newInstance();
        }
    } catch (Exception ex) {
        // #TO#DO#: Root cause exception context is lost here; just exception message preserved.
        // Should we throw another exception type that preserves context instead?
        throw new NullValueInNestedPathException(getRootClass(), this.nestedPath + name,
                "Could not instantiate property type [" + type.getName()
                        + "] to auto-grow nested property path: " + ex);
    }
}

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From source file:org.springframework.beans.AbstractNestablePropertyAccessor.java

private Object newValue(Class<?> type, @Nullable TypeDescriptor desc, String name) {
    try {/*from w  w  w  . ja  v  a 2  s .  co m*/
        if (type.isArray()) {
            Class<?> componentType = type.getComponentType();
            // TODO - only handles 2-dimensional arrays
            if (componentType.isArray()) {
                Object array = Array.newInstance(componentType, 1);
                Array.set(array, 0, Array.newInstance(componentType.getComponentType(), 0));
                return array;
            } else {
                return Array.newInstance(componentType, 0);
            }
        } else if (Collection.class.isAssignableFrom(type)) {
            TypeDescriptor elementDesc = (desc != null ? desc.getElementTypeDescriptor() : null);
            return CollectionFactory.createCollection(type,
                    (elementDesc != null ? elementDesc.getType() : null), 16);
        } else if (Map.class.isAssignableFrom(type)) {
            TypeDescriptor keyDesc = (desc != null ? desc.getMapKeyTypeDescriptor() : null);
            return CollectionFactory.createMap(type, (keyDesc != null ? keyDesc.getType() : null), 16);
        } else {
            Constructor<?> ctor = type.getDeclaredConstructor();
            if (Modifier.isPrivate(ctor.getModifiers())) {
                throw new IllegalAccessException("Auto-growing not allowed with private constructor: " + ctor);
            }
            return BeanUtils.instantiateClass(ctor);
        }
    } catch (Throwable ex) {
        throw new NullValueInNestedPathException(getRootClass(), this.nestedPath + name,
                "Could not instantiate property type [" + type.getName()
                        + "] to auto-grow nested property path",
                ex);
    }
}

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From source file:org.springframework.beans.BeanWrapperImpl.java

private Object newValue(Class<?> type, TypeDescriptor desc, String name) {
    try {/*  www .  j  av  a 2s.c  o m*/
        if (type.isArray()) {
            Class<?> componentType = type.getComponentType();
            // TODO - only handles 2-dimensional arrays
            if (componentType.isArray()) {
                Object array = Array.newInstance(componentType, 1);
                Array.set(array, 0, Array.newInstance(componentType.getComponentType(), 0));
                return array;
            } else {
                return Array.newInstance(componentType, 0);
            }
        } else if (Collection.class.isAssignableFrom(type)) {
            TypeDescriptor elementDesc = (desc != null ? desc.getElementTypeDescriptor() : null);
            return CollectionFactory.createCollection(type,
                    (elementDesc != null ? elementDesc.getType() : null), 16);
        } else if (Map.class.isAssignableFrom(type)) {
            TypeDescriptor keyDesc = (desc != null ? desc.getMapKeyTypeDescriptor() : null);
            return CollectionFactory.createMap(type, (keyDesc != null ? keyDesc.getType() : null), 16);
        } else {
            return type.newInstance();
        }
    } catch (Exception ex) {
        // TODO: Root cause exception context is lost here; just exception message preserved.
        // Should we throw another exception type that preserves context instead?
        throw new NullValueInNestedPathException(getRootClass(), this.nestedPath + name,
                "Could not instantiate property type [" + type.getName()
                        + "] to auto-grow nested property path: " + ex);
    }
}

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