ch.qos.logback.core.joran.action.NestedBasicPropertyIA Maven / Gradle / Ivy

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With inspiration from other libraries
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/**
 * Logback: the reliable, generic, fast and flexible logging framework.
 * Copyright (C) 1999-2015, QOS.ch. All rights reserved.
 *
 * This program and the accompanying materials are dual-licensed under
 * either the terms of the Eclipse Public License v1.0 as published by
 * the Eclipse Foundation
 *
 *   or (per the licensee's choosing)
 *
 * under the terms of the GNU Lesser General Public License version 2.1
 * as published by the Free Software Foundation.
 */
package ch.qos.logback.core.joran.action;

import java.util.Stack;

import ch.qos.logback.core.joran.spi.ElementPath;

import org.xml.sax.Attributes;

import ch.qos.logback.core.joran.spi.InterpretationContext;
import ch.qos.logback.core.joran.util.PropertySetter;
import ch.qos.logback.core.joran.util.beans.BeanDescriptionCache;
import ch.qos.logback.core.util.AggregationType;

/**
 * This action is responsible for tying together a parent object with one of its
 * simple properties specified as an element but for which there is
 * no explicit rule.
 *
 * @author Ceki Gülcü
 */
public class NestedBasicPropertyIA extends ImplicitAction {

    // We use a stack of IADataForBasicProperty objects in order to
    // support nested elements which are handled by the same NestedBasicPropertyIA instance.
    // We push a IADataForBasicProperty instance in the isApplicable method (if the
    // action is applicable) and pop it in the end() method.
    // The XML well-formedness property will guarantee that a push will eventually
    // be followed by the corresponding pop.
    Stack actionDataStack = new Stack();

    private final BeanDescriptionCache beanDescriptionCache;

    public NestedBasicPropertyIA(BeanDescriptionCache beanDescriptionCache) {
        this.beanDescriptionCache = beanDescriptionCache;
    }

    public boolean isApplicable(ElementPath elementPath, Attributes attributes, InterpretationContext ec) {
        // System.out.println("in NestedSimplePropertyIA.isApplicable [" + pattern +
        // "]");
        String nestedElementTagName = elementPath.peekLast();

        // no point in attempting if there is no parent object
        if (ec.isEmpty()) {
            return false;
        }

        Object o = ec.peekObject();
        PropertySetter parentBean = new PropertySetter(beanDescriptionCache, o);
        parentBean.setContext(context);

        AggregationType aggregationType = parentBean.computeAggregationType(nestedElementTagName);

        switch (aggregationType) {
        case NOT_FOUND:
        case AS_COMPLEX_PROPERTY:
        case AS_COMPLEX_PROPERTY_COLLECTION:
            return false;

        case AS_BASIC_PROPERTY:
        case AS_BASIC_PROPERTY_COLLECTION:
            IADataForBasicProperty ad = new IADataForBasicProperty(parentBean, aggregationType, nestedElementTagName);
            actionDataStack.push(ad);
            // addInfo("NestedSimplePropertyIA deemed applicable [" + pattern + "]");
            return true;
        default:
            addError("PropertySetter.canContainComponent returned " + aggregationType);
            return false;
        }
    }

    public void begin(InterpretationContext ec, String localName, Attributes attributes) {
        // NOP
    }

    public void body(InterpretationContext ec, String body) {

        String finalBody = ec.subst(body);
        // get the action data object pushed in isApplicable() method call
        IADataForBasicProperty actionData = (IADataForBasicProperty) actionDataStack.peek();
        switch (actionData.aggregationType) {
        case AS_BASIC_PROPERTY:
            actionData.parentBean.setProperty(actionData.propertyName, finalBody);
            break;
        case AS_BASIC_PROPERTY_COLLECTION:
            actionData.parentBean.addBasicProperty(actionData.propertyName, finalBody);
            break;
        default:
            addError("Unexpected aggregationType " + actionData.aggregationType);
        }
    }

    public void end(InterpretationContext ec, String tagName) {
        // pop the action data object pushed in isApplicable() method call
        actionDataStack.pop();
    }
}