net.sourceforge.htmlunit.xerces.xni.parser.XMLComponent Maven / Gradle / Ivy

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HtmlUnit adaptation of NekoHtml. It has the same functionality but exposing HTMLElements to be overridden.
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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package net.sourceforge.htmlunit.xerces.xni.parser;

import net.sourceforge.htmlunit.xerces.xni.XNIException;

/**
 * The component interface defines methods that must be implemented
 * by components in a parser configuration. The component methods allow
 * the component manager to initialize the component state and notify
 * the component when feature and property values change.
 *
 * @see XMLComponentManager
 *
 * @author Andy Clark, IBM
 */
public interface XMLComponent {

    /**
     * Resets the component. The component can query the component manager
     * about any features and properties that affect the operation of the
     * component.
     *
     * @param componentManager The component manager.
     *
     * @throws XNIException Thrown by component on initialization error.
     */
    void reset(XMLComponentManager componentManager)
        throws XMLConfigurationException;

    /**
     * @return an array of feature identifiers that are recognized by
     * this component. This method may return null if no features
     * are recognized by this component.
     */
    String[] getRecognizedFeatures();

    /**
     * Sets the state of a feature. This method is called by the component
     * manager any time after reset when a feature changes state.
     * 
     * Note: Components should silently ignore features
     * that do not affect the operation of the component.
     *
     * @param featureId The feature identifier.
     * @param state     The state of the feature.
     *
     * @throws XMLConfigurationException Thrown for configuration error.
     *                                   In general, components should
     *                                   only throw this exception if
     *                                   it is really
     *                                   a critical error.
     */
    void setFeature(String featureId, boolean state)
        throws XMLConfigurationException;

    /**
     * @return an array of property identifiers that are recognized by
     * this component. This method may return null if no properties
     * are recognized by this component.
     */
    String[] getRecognizedProperties();

    /**
     * Sets the value of a property. This method is called by the component
     * manager any time after reset when a property changes value.
     * 
     * Note: Components should silently ignore properties
     * that do not affect the operation of the component.
     *
     * @param propertyId The property identifier.
     * @param value      The value of the property.
     *
     * @throws XMLConfigurationException Thrown for configuration error.
     *                                   In general, components should
     *                                   only throw this exception if
     *                                   it is really
     *                                   a critical error.
     */
    void setProperty(String propertyId, Object value)
       throws XMLConfigurationException;

    /**
     * @param featureId The feature identifier.
     * @return the default state for a feature, or null if this
     * component does not want to report a default value for this
     * feature.
     */
    Boolean getFeatureDefault(String featureId);

    /**
     * @param propertyId The property identifier.
     * @return the default state for a property, or null if this
     * component does not want to report a default value for this
     * property
     */
    Object getPropertyDefault(String propertyId);
}