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.
/**
 * 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 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;

public class ParamAction extends Action {
    static String NO_NAME = "No name attribute in <param> element";
    static String NO_VALUE = "No value attribute in <param> element";
    boolean inError = false;

	private final BeanDescriptionCache beanDescriptionCache;
	public ParamAction(BeanDescriptionCache beanDescriptionCache) {
		this.beanDescriptionCache=beanDescriptionCache;
	}

    public void begin(InterpretationContext ec, String localName, Attributes attributes) {
        String name = attributes.getValue(NAME_ATTRIBUTE);
        String value = attributes.getValue(VALUE_ATTRIBUTE);

        if (name == null) {
            inError = true;
            addError(NO_NAME);
            return;
        }

        if (value == null) {
            inError = true;
            addError(NO_VALUE);
            return;
        }

        // remove both leading and trailing spaces
        value = value.trim();

        Object o = ec.peekObject();
        PropertySetter propSetter = new PropertySetter(beanDescriptionCache,o);
        propSetter.setContext(context);
        value = ec.subst(value);

        // allow for variable substitution for name as well
        name = ec.subst(name);

        // getLogger().debug(
        // "In ParamAction setting parameter [{}] to value [{}].", name, value);
        propSetter.setProperty(name, value);
    }

    public void end(InterpretationContext ec, String localName) {
    }

    public void finish(InterpretationContext ec) {
    }
}