Example usage for org.springframework.core.convert TypeDescriptor narrow

Introduction

In this page you can find the example usage for org.springframework.core.convert TypeDescriptor narrow.

Prototype

public TypeDescriptor narrow(@Nullable Object value) 

Source Link

Document

Narrows this TypeDescriptor by setting its type to the class of the provided value.

Usage

From source file:net.sf.juffrou.reflect.JuffrouTypeConverterDelegate.java

@SuppressWarnings("unchecked")
private Map convertToTypedMap(Map original, String propertyName, Class requiredType,
        TypeDescriptor typeDescriptor) {

    if (!Map.class.isAssignableFrom(requiredType)) {
        return original;
    }//from   w w w  .jav a 2  s .c  o  m

    boolean approximable = CollectionFactory.isApproximableMapType(requiredType);
    if (!approximable && !canCreateCopy(requiredType)) {
        if (logger.isDebugEnabled()) {
            logger.debug("Custom Map type [" + original.getClass().getName()
                    + "] does not allow for creating a copy - injecting original Map as-is");
        }
        return original;
    }

    boolean originalAllowed = requiredType.isInstance(original);
    typeDescriptor = typeDescriptor.narrow(original);
    TypeDescriptor keyType = typeDescriptor.getMapKeyTypeDescriptor();
    TypeDescriptor valueType = typeDescriptor.getMapValueTypeDescriptor();
    if (keyType == null && valueType == null && originalAllowed
            && !this.propertyEditorRegistry.hasCustomEditorForElement(null, propertyName)) {
        return original;
    }

    Iterator it;
    try {
        it = original.entrySet().iterator();
        if (it == null) {
            if (logger.isDebugEnabled()) {
                logger.debug("Map of type [" + original.getClass().getName()
                        + "] returned null Iterator - injecting original Map as-is");
            }
            return original;
        }
    } catch (Throwable ex) {
        if (logger.isDebugEnabled()) {
            logger.debug("Cannot access Map of type [" + original.getClass().getName()
                    + "] - injecting original Map as-is: " + ex);
        }
        return original;
    }

    Map convertedCopy;
    try {
        if (approximable) {
            convertedCopy = CollectionFactory.createApproximateMap(original, original.size());
        } else {
            convertedCopy = (Map) requiredType.newInstance();
        }
    } catch (Throwable ex) {
        if (logger.isDebugEnabled()) {
            logger.debug("Cannot create copy of Map type [" + original.getClass().getName()
                    + "] - injecting original Map as-is: " + ex);
        }
        return original;
    }

    while (it.hasNext()) {
        Map.Entry entry = (Map.Entry) it.next();
        Object key = entry.getKey();
        Object value = entry.getValue();
        String keyedPropertyName = buildKeyedPropertyName(propertyName, key);
        Object convertedKey = convertIfNecessary(keyedPropertyName, null, key,
                (keyType != null ? keyType.getType() : null), keyType);
        Object convertedValue = convertIfNecessary(keyedPropertyName, null, value,
                (valueType != null ? valueType.getType() : null), valueType);
        try {
            convertedCopy.put(convertedKey, convertedValue);
        } catch (Throwable ex) {
            if (logger.isDebugEnabled()) {
                logger.debug("Map type [" + original.getClass().getName()
                        + "] seems to be read-only - injecting original Map as-is: " + ex);
            }
            return original;
        }
        originalAllowed = originalAllowed && (key == convertedKey) && (value == convertedValue);
    }
    return (originalAllowed ? original : convertedCopy);
}

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From source file:net.sf.juffrou.reflect.JuffrouTypeConverterDelegate.java

@SuppressWarnings("unchecked")
private Collection convertToTypedCollection(Collection original, String propertyName, Class requiredType,
        TypeDescriptor typeDescriptor) {

    if (!Collection.class.isAssignableFrom(requiredType)) {
        return original;
    }/*from  w w  w .  ja va2s.  com*/

    boolean approximable = CollectionFactory.isApproximableCollectionType(requiredType);
    if (!approximable && !canCreateCopy(requiredType)) {
        if (logger.isDebugEnabled()) {
            logger.debug("Custom Collection type [" + original.getClass().getName()
                    + "] does not allow for creating a copy - injecting original Collection as-is");
        }
        return original;
    }

    boolean originalAllowed = requiredType.isInstance(original);
    typeDescriptor = typeDescriptor.narrow(original);
    TypeDescriptor elementType = typeDescriptor.getElementTypeDescriptor();
    if (elementType == null && originalAllowed
            && !this.propertyEditorRegistry.hasCustomEditorForElement(null, propertyName)) {
        return original;
    }

    Iterator it;
    try {
        it = original.iterator();
        if (it == null) {
            if (logger.isDebugEnabled()) {
                logger.debug("Collection of type [" + original.getClass().getName()
                        + "] returned null Iterator - injecting original Collection as-is");
            }
            return original;
        }
    } catch (Throwable ex) {
        if (logger.isDebugEnabled()) {
            logger.debug("Cannot access Collection of type [" + original.getClass().getName()
                    + "] - injecting original Collection as-is: " + ex);
        }
        return original;
    }

    Collection convertedCopy;
    try {
        if (approximable) {
            convertedCopy = CollectionFactory.createApproximateCollection(original, original.size());
        } else {
            convertedCopy = (Collection) requiredType.newInstance();
        }
    } catch (Throwable ex) {
        if (logger.isDebugEnabled()) {
            logger.debug("Cannot create copy of Collection type [" + original.getClass().getName()
                    + "] - injecting original Collection as-is: " + ex);
        }
        return original;
    }

    int i = 0;
    for (; it.hasNext(); i++) {
        Object element = it.next();
        String indexedPropertyName = buildIndexedPropertyName(propertyName, i);
        Object convertedElement = convertIfNecessary(indexedPropertyName, null, element,
                (elementType != null ? elementType.getType() : null), elementType);
        try {
            convertedCopy.add(convertedElement);
        } catch (Throwable ex) {
            if (logger.isDebugEnabled()) {
                logger.debug("Collection type [" + original.getClass().getName()
                        + "] seems to be read-only - injecting original Collection as-is: " + ex);
            }
            return original;
        }
        originalAllowed = originalAllowed && (element == convertedElement);
    }
    return (originalAllowed ? original : convertedCopy);
}

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