/*
* 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 org.apache.xerces.util;
import java.util.ArrayList;
import java.util.HashMap;
import org.apache.xerces.impl.Constants;
import org.apache.xerces.xni.parser.XMLComponentManager;
import org.apache.xerces.xni.parser.XMLConfigurationException;
/**
* This class implements the basic operations for managing parser
* configuration features and properties. This utility class can
* be used as a base class for parser configurations or separately
* to encapsulate a number of parser settings as a component
* manager.
* <p>
* This class can be constructed with a "parent" settings object
* (in the form of an <code>XMLComponentManager</code>) that allows
* parser configuration settings to be "chained" together.
*
* @author Andy Clark, IBM
*
* @version $Id: ParserConfigurationSettings.java 447241 2006-09-18 05:12:57Z mrglavas $
*/
public class ParserConfigurationSettings
implements XMLComponentManager {
protected static final String PARSER_SETTINGS =
Constants.XERCES_FEATURE_PREFIX + Constants.PARSER_SETTINGS;
//
// Data
//
// data
/** Recognized properties. */
protected ArrayList fRecognizedProperties;
/** Properties. */
protected HashMap fProperties;
/** Recognized features. */
protected ArrayList fRecognizedFeatures;
/** Features. */
protected HashMap fFeatures;
/** Parent parser configuration settings. */
protected XMLComponentManager fParentSettings;
//
// Constructors
//
/** Default Constructor. */
public ParserConfigurationSettings() {
this(null);
} // <init>()
/**
* Constructs a parser configuration settings object with a
* parent settings object.
*/
public ParserConfigurationSettings(XMLComponentManager parent) {
// create storage for recognized features and properties
fRecognizedFeatures = new ArrayList();
fRecognizedProperties = new ArrayList();
// create table for features and properties
fFeatures = new HashMap();
fProperties = new HashMap();
// save parent
fParentSettings = parent;
} // <init>(XMLComponentManager)
//
// XMLParserConfiguration methods
//
/**
* Allows a parser to add parser specific features to be recognized
* and managed by the parser configuration.
*
* @param featureIds An array of the additional feature identifiers
* to be recognized.
*/
public void addRecognizedFeatures(String[] featureIds) {
// add recognized features
int featureIdsCount = featureIds != null ? featureIds.length : 0;
for (int i = 0; i < featureIdsCount; i++) {
String featureId = featureIds[i];
if (!fRecognizedFeatures.contains(featureId)) {
fRecognizedFeatures.add(featureId);
}
}
} // addRecognizedFeatures(String[])
/**
* Set the state of a feature.
*
* Set the state of any feature in a SAX2 parser. The parser
* might not recognize the feature, and if it does recognize
* it, it might not be able to fulfill the request.
*
* @param featureId The unique identifier (URI) of the feature.
* @param state The requested state of the feature (true or false).
*
* @exception org.apache.xerces.xni.parser.XMLConfigurationException If the
* requested feature is not known.
*/
public void setFeature(String featureId, boolean state)
throws XMLConfigurationException {
// check and store
checkFeature(featureId);
fFeatures.put(featureId, state ? Boolean.TRUE : Boolean.FALSE);
} // setFeature(String,boolean)
/**
* Allows a parser to add parser specific properties to be recognized
* and managed by the parser configuration.
*
* @param propertyIds An array of the additional property identifiers
* to be recognized.
*/
public void addRecognizedProperties(String[] propertyIds) {
// add recognizedProperties
int propertyIdsCount = propertyIds != null ? propertyIds.length : 0;
for (int i = 0; i < propertyIdsCount; i++) {
String propertyId = propertyIds[i];
if (!fRecognizedProperties.contains(propertyId)) {
fRecognizedProperties.add(propertyId);
}
}
} // addRecognizedProperties(String[])
/**
* setProperty
*
* @param propertyId
* @param value
* @exception org.apache.xerces.xni.parser.XMLConfigurationException If the
* requested feature is not known.
*/
public void setProperty(String propertyId, Object value)
throws XMLConfigurationException {
// check and store
checkProperty(propertyId);
fProperties.put(propertyId, value);
} // setProperty(String,Object)
//
// XMLComponentManager methods
//
/**
* Returns the state of a feature.
*
* @param featureId The feature identifier.
* @return true if the feature is supported
*
* @throws XMLConfigurationException Thrown for configuration error.
* In general, components should
* only throw this exception if
* it is <strong>really</strong>
* a critical error.
*/
public boolean getFeature(String featureId)
throws XMLConfigurationException {
Boolean state = (Boolean) fFeatures.get(featureId);
if (state == null) {
checkFeature(featureId);
return false;
}
return state.booleanValue();
} // getFeature(String):boolean
/**
* Returns the value of a property.
*
* @param propertyId The property identifier.
* @return the value of the property
*
* @throws XMLConfigurationException Thrown for configuration error.
* In general, components should
* only throw this exception if
* it is <strong>really</strong>
* a critical error.
*/
public Object getProperty(String propertyId)
throws XMLConfigurationException {
Object propertyValue = fProperties.get(propertyId);
if (propertyValue == null) {
checkProperty(propertyId);
}
return propertyValue;
} // getProperty(String):Object
//
// Protected methods
//
/**
* Check a feature. If feature is known and supported, this method simply
* returns. Otherwise, the appropriate exception is thrown.
*
* @param featureId The unique identifier (URI) of the feature.
*
* @exception org.apache.xerces.xni.parser.XMLConfigurationException If the
* requested feature is not known.
*/
protected void checkFeature(String featureId)
throws XMLConfigurationException {
// check feature
if (!fRecognizedFeatures.contains(featureId)) {
if (fParentSettings != null) {
fParentSettings.getFeature(featureId);
}
else {
short type = XMLConfigurationException.NOT_RECOGNIZED;
throw new XMLConfigurationException(type, featureId);
}
}
} // checkFeature(String)
/**
* Check a property. If the property is known and supported, this method
* simply returns. Otherwise, the appropriate exception is thrown.
*
* @param propertyId The unique identifier (URI) of the property
* being set.
* @exception org.apache.xerces.xni.parser.XMLConfigurationException If the
* requested feature is not known.
*/
protected void checkProperty(String propertyId)
throws XMLConfigurationException {
// check property
if (!fRecognizedProperties.contains(propertyId)) {
if (fParentSettings != null) {
fParentSettings.getProperty(propertyId);
}
else {
short type = XMLConfigurationException.NOT_RECOGNIZED;
throw new XMLConfigurationException(type, propertyId);
}
}
} // checkProperty(String)
} // class ParserConfigurationSettings
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