Example usage for org.apache.commons.collections TransformerUtils chainedTransformer

Introduction

In this page you can find the example usage for org.apache.commons.collections TransformerUtils chainedTransformer.

Prototype

public static Transformer chainedTransformer(Collection transformers) 

Source Link

Document

Create a new Transformer that calls each transformer in turn, passing the result into the next transformer.

Usage

From source file:gov.nih.nci.caarray.security.SecurityPolicy.java

/**
 * Returns a transformer to be applied to the given property on the given entity, given the set
 * of applicable policies. If multiple Transformers are to be applied, then the returned
 * Transformer represents a chaining of those Transformers. If no Transformers are to be applied,
 * returns null//  ww w  .  j ava  2s.com
 *
 * @param policies the active policies
 * @param propertyAccessor accessor for the property on the object
 * @return the Transformer to be applied, or null if none should be applied
 */
private static Transformer getPropertyTransformer(Set<SecurityPolicy> policies, PropertyAccessor propAccessor) {
    AttributePolicy attributePolicy = getAttributePolicy(propAccessor);
    if (attributePolicy == null) {
        return null;
    }
    List<Transformer> transformers = new ArrayList<Transformer>();
    for (AttributeTransformer attrTransformer : attributePolicy.transformers()) {
        if (policiesMatch(attrTransformer.policies(), policies)) {
            try {
                transformers.add(attrTransformer.transformer().newInstance());
            } catch (InstantiationException e) {
                LOG.warn(
                        "Could not instantiate transformer of class " + attrTransformer.transformer().getName(),
                        e);
            } catch (IllegalAccessException e) {
                LOG.warn(
                        "Could not instantiate transformer of class " + attrTransformer.transformer().getName(),
                        e);
            }
        }
    }
    return transformers.isEmpty() ? null : TransformerUtils.chainedTransformer(transformers);
}

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