/*
 * reserved comment block
 * DO NOT REMOVE OR ALTER!
 */
/*
 * Copyright 2005 The Apache Software Foundation.
 *
 * Licensed 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 com.sun.org.apache.xerces.internal.jaxp.validation;

import java.util.HashMap;
import java.util.Locale;
import java.util.Iterator;
import java.util.Map;

import javax.xml.XMLConstants;

import com.sun.org.apache.xerces.internal.impl.Constants;
import com.sun.org.apache.xerces.internal.impl.XMLEntityManager;
import com.sun.org.apache.xerces.internal.impl.XMLErrorReporter;
import com.sun.org.apache.xerces.internal.impl.validation.ValidationManager;
import com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator;
import com.sun.org.apache.xerces.internal.impl.xs.XSMessageFormatter;
import com.sun.org.apache.xerces.internal.util.DOMEntityResolverWrapper;
import com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper;
import com.sun.org.apache.xerces.internal.util.FeatureState;
import com.sun.org.apache.xerces.internal.util.NamespaceSupport;
import com.sun.org.apache.xerces.internal.util.ParserConfigurationSettings;
import com.sun.org.apache.xerces.internal.util.PropertyState;
import com.sun.org.apache.xerces.internal.util.SecurityManager;
import com.sun.org.apache.xerces.internal.util.Status;
import com.sun.org.apache.xerces.internal.util.SymbolTable;
import com.sun.org.apache.xerces.internal.xni.NamespaceContext;
import com.sun.org.apache.xerces.internal.xni.XNIException;
import com.sun.org.apache.xerces.internal.xni.parser.XMLComponent;
import com.sun.org.apache.xerces.internal.xni.parser.XMLComponentManager;
import com.sun.org.apache.xerces.internal.xni.parser.XMLConfigurationException;
import org.w3c.dom.ls.LSResourceResolver;
import org.xml.sax.ErrorHandler;

/**
 * <p>An implementation of XMLComponentManager for a schema validator.</p>
 *
 * @author Michael Glavassevich, IBM
 * @version $Id: XMLSchemaValidatorComponentManager.java,v 1.9 2010-11-01 04:40:08 joehw Exp $
 */
final class XMLSchemaValidatorComponentManager extends ParserConfigurationSettings implements
        XMLComponentManager {

    // feature identifiers

    /** Feature identifier: schema validation. */
    private static final String SCHEMA_VALIDATION =
        Constants.XERCES_FEATURE_PREFIX + Constants.SCHEMA_VALIDATION_FEATURE;

    /** Feature identifier: validation. */
    private static final String VALIDATION =
        Constants.SAX_FEATURE_PREFIX + Constants.VALIDATION_FEATURE;

    /** Feature identifier: send element default value via characters() */
    private static final String SCHEMA_ELEMENT_DEFAULT =
        Constants.XERCES_FEATURE_PREFIX + Constants.SCHEMA_ELEMENT_DEFAULT;

    /** Feature identifier: use grammar pool only. */
    private static final String USE_GRAMMAR_POOL_ONLY =
        Constants.XERCES_FEATURE_PREFIX + Constants.USE_GRAMMAR_POOL_ONLY_FEATURE;

    // property identifiers

    /** Property identifier: entity manager. */
    private static final String ENTITY_MANAGER =
        Constants.XERCES_PROPERTY_PREFIX + Constants.ENTITY_MANAGER_PROPERTY;

    /** Property identifier: entity resolver. */
    private static final String ENTITY_RESOLVER =
        Constants.XERCES_PROPERTY_PREFIX + Constants.ENTITY_RESOLVER_PROPERTY;

    /** Property identifier: error handler. */
    private static final String ERROR_HANDLER =
        Constants.XERCES_PROPERTY_PREFIX + Constants.ERROR_HANDLER_PROPERTY;

    /** Property identifier: error reporter. */
    private static final String ERROR_REPORTER =
        Constants.XERCES_PROPERTY_PREFIX + Constants.ERROR_REPORTER_PROPERTY;

    /** Property identifier: namespace context. */
    private static final String NAMESPACE_CONTEXT =
        Constants.XERCES_PROPERTY_PREFIX + Constants.NAMESPACE_CONTEXT_PROPERTY;

    /** Property identifier: XML Schema validator. */
    private static final String SCHEMA_VALIDATOR =
        Constants.XERCES_PROPERTY_PREFIX + Constants.SCHEMA_VALIDATOR_PROPERTY;

    /** Property identifier: security manager. */
    private static final String SECURITY_MANAGER =
        Constants.XERCES_PROPERTY_PREFIX + Constants.SECURITY_MANAGER_PROPERTY;

    /** Property identifier: symbol table. */
    private static final String SYMBOL_TABLE =
        Constants.XERCES_PROPERTY_PREFIX + Constants.SYMBOL_TABLE_PROPERTY;

    /** Property identifier: validation manager. */
    private static final String VALIDATION_MANAGER =
        Constants.XERCES_PROPERTY_PREFIX + Constants.VALIDATION_MANAGER_PROPERTY;

    /** Property identifier: grammar pool. */
    private static final String XMLGRAMMAR_POOL =
        Constants.XERCES_PROPERTY_PREFIX + Constants.XMLGRAMMAR_POOL_PROPERTY;

    /** Property identifier: locale. */
    private static final String LOCALE =
        Constants.XERCES_PROPERTY_PREFIX + Constants.LOCALE_PROPERTY;

    //
    // Data
    //
    /**
     * <p>State of secure mode.</p>
     */
    private boolean _isSecureMode = false;

    /**
     * fConfigUpdated is set to true if there has been any change to the configuration settings,
     * i.e a feature or a property was changed.
     */
    private boolean fConfigUpdated = true;

    /**
     * Tracks whether the validator should use components from
     * the grammar pool to the exclusion of all others.
     */
    private boolean fUseGrammarPoolOnly;

    /** Lookup map for components required for validation. **/
    private final HashMap fComponents = new HashMap();

    //
    // Components
    //

    /** Entity manager. */
    private XMLEntityManager fEntityManager;

    /** Error reporter. */
    private XMLErrorReporter fErrorReporter;

    /** Namespace context. */
    private NamespaceContext fNamespaceContext;

    /** XML Schema validator. */
    private XMLSchemaValidator fSchemaValidator;

    /** Validation manager. */
    private ValidationManager fValidationManager;

    //
    // Configuration
    //

    /** Stores initial feature values for validator reset. */
    private final HashMap fInitFeatures = new HashMap();

    /** Stores initial property values for validator reset. */
    private final HashMap fInitProperties = new HashMap();

    /** Stores the initial security manager. */
    private final SecurityManager fInitSecurityManager;

    //
    // User Objects
    //

    /** Application's ErrorHandler. **/
    private ErrorHandler fErrorHandler = null;

    /** Application's LSResourceResolver. */
    private LSResourceResolver fResourceResolver = null;

    /** Locale chosen by the application. */
    private Locale fLocale = null;

    /** Constructs a component manager suitable for Xerces' schema validator. */
    public XMLSchemaValidatorComponentManager(XSGrammarPoolContainer grammarContainer) {
        // setup components
        fEntityManager = new XMLEntityManager();
        fComponents.put(ENTITY_MANAGER, fEntityManager);

        fErrorReporter = new XMLErrorReporter();
        fComponents.put(ERROR_REPORTER, fErrorReporter);

        fNamespaceContext = new NamespaceSupport();
        fComponents.put(NAMESPACE_CONTEXT, fNamespaceContext);

        fSchemaValidator = new XMLSchemaValidator();
        fComponents.put(SCHEMA_VALIDATOR, fSchemaValidator);

        fValidationManager = new ValidationManager();
        fComponents.put(VALIDATION_MANAGER, fValidationManager);

        // setup other properties
        fComponents.put(ENTITY_RESOLVER, null);
        fComponents.put(ERROR_HANDLER, null);

        if (System.getSecurityManager() != null) {
            _isSecureMode = true;
            setProperty(SECURITY_MANAGER, new SecurityManager());
        } else {
            fComponents.put(SECURITY_MANAGER, null);
        }
        fComponents.put(SYMBOL_TABLE, new SymbolTable());

        // setup grammar pool
        fComponents.put(XMLGRAMMAR_POOL, grammarContainer.getGrammarPool());
        fUseGrammarPoolOnly = grammarContainer.isFullyComposed();

        // add schema message formatter to error reporter
        fErrorReporter.putMessageFormatter(XSMessageFormatter.SCHEMA_DOMAIN, new XSMessageFormatter());

        // add all recognized features and properties and apply their defaults
        addRecognizedParamsAndSetDefaults(fEntityManager, grammarContainer);
        addRecognizedParamsAndSetDefaults(fErrorReporter, grammarContainer);
        addRecognizedParamsAndSetDefaults(fSchemaValidator, grammarContainer);

        // if the secure processing feature is set to true, add a security manager to the configuration
        Boolean secureProcessing = grammarContainer.getFeature(XMLConstants.FEATURE_SECURE_PROCESSING);
        if (Boolean.TRUE.equals(secureProcessing)) {
            fInitSecurityManager = new SecurityManager();
        }
        else {
            fInitSecurityManager = null;
        }
        fComponents.put(SECURITY_MANAGER, fInitSecurityManager);

    }

    /**
     * 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 FeatureState getFeatureState(String featureId)
            throws XMLConfigurationException {
        if (PARSER_SETTINGS.equals(featureId)) {
            return FeatureState.is(fConfigUpdated);
        }
        else if (VALIDATION.equals(featureId) || SCHEMA_VALIDATION.equals(featureId)) {
            return FeatureState.is(true);
        }
        else if (USE_GRAMMAR_POOL_ONLY.equals(featureId)) {
            return FeatureState.is(fUseGrammarPoolOnly);
        }
        else if (XMLConstants.FEATURE_SECURE_PROCESSING.equals(featureId)) {
            return FeatureState.is(getProperty(SECURITY_MANAGER) != null);
        }
        else if (SCHEMA_ELEMENT_DEFAULT.equals(featureId)) {
            return FeatureState.is(true); //pre-condition: VALIDATION and SCHEMA_VALIDATION are always true
        }
        return super.getFeatureState(featureId);
    }

    /**
     * Set the state of a feature.
     *
     * @param featureId The unique identifier (URI) of the feature.
     * @param state The requested state of the feature (true or false).
     *
     * @exception XMLConfigurationException If the requested feature is not known.
     */
    public void setFeature(String featureId, boolean value) throws XMLConfigurationException {
        if (PARSER_SETTINGS.equals(featureId)) {
            throw new XMLConfigurationException(Status.NOT_SUPPORTED, featureId);
        }
        else if (value == false && (VALIDATION.equals(featureId) || SCHEMA_VALIDATION.equals(featureId))) {
            throw new XMLConfigurationException(Status.NOT_SUPPORTED, featureId);
        }
        else if (USE_GRAMMAR_POOL_ONLY.equals(featureId) && value != fUseGrammarPoolOnly) {
            throw new XMLConfigurationException(Status.NOT_SUPPORTED, featureId);
        }
        if (XMLConstants.FEATURE_SECURE_PROCESSING.equals(featureId)) {
            if (_isSecureMode && !value) {
                throw new XMLConfigurationException(Status.NOT_ALLOWED, XMLConstants.FEATURE_SECURE_PROCESSING);
            }
            setProperty(SECURITY_MANAGER, value ? new SecurityManager() : null);
            return;
        }
        fConfigUpdated = true;
        fEntityManager.setFeature(featureId, value);
        fErrorReporter.setFeature(featureId, value);
        fSchemaValidator.setFeature(featureId, value);
        if (!fInitFeatures.containsKey(featureId)) {
            boolean current = super.getFeature(featureId);
            fInitFeatures.put(featureId, current ? Boolean.TRUE : Boolean.FALSE);
        }
        super.setFeature(featureId, value);
    }

    /**
     * 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 PropertyState getPropertyState(String propertyId)
            throws XMLConfigurationException {
        if (LOCALE.equals(propertyId)) {
            return PropertyState.is(getLocale());
        }
        final Object component = fComponents.get(propertyId);
        if (component != null) {
            return PropertyState.is(component);
        }
        else if (fComponents.containsKey(propertyId)) {
            return PropertyState.is(null);
        }
        return super.getPropertyState(propertyId);
    }

    /**
     * Sets the state of a property.
     *
     * @param propertyId The unique identifier (URI) of the property.
     * @param value The requested state of the property.
     *
     * @exception XMLConfigurationException If the requested property is not known.
     */
    public void setProperty(String propertyId, Object value) throws XMLConfigurationException {
        if ( ENTITY_MANAGER.equals(propertyId) || ERROR_REPORTER.equals(propertyId) ||
             NAMESPACE_CONTEXT.equals(propertyId) || SCHEMA_VALIDATOR.equals(propertyId) ||
             SYMBOL_TABLE.equals(propertyId) || VALIDATION_MANAGER.equals(propertyId) ||
             XMLGRAMMAR_POOL.equals(propertyId)) {
            throw new XMLConfigurationException(Status.NOT_SUPPORTED, propertyId);
        }
        fConfigUpdated = true;
        fEntityManager.setProperty(propertyId, value);
        fErrorReporter.setProperty(propertyId, value);
        fSchemaValidator.setProperty(propertyId, value);
        if (ENTITY_RESOLVER.equals(propertyId) || ERROR_HANDLER.equals(propertyId) ||
                SECURITY_MANAGER.equals(propertyId)) {
            fComponents.put(propertyId, value);
            return;
        }
        else if (LOCALE.equals(propertyId)) {
            setLocale((Locale) value);
            fComponents.put(propertyId, value);
            return;
        }
        if (!fInitProperties.containsKey(propertyId)) {
            fInitProperties.put(propertyId, super.getProperty(propertyId));
        }
        super.setProperty(propertyId, value);
    }

    /**
     * Adds all of the component's recognized features and properties
     * to the list of default recognized features and properties, and
     * sets default values on the configuration for features and
     * properties which were previously absent from the configuration.
     *
     * @param component The component whose recognized features
     * and properties will be added to the configuration
     */
    public void addRecognizedParamsAndSetDefaults(XMLComponent component, XSGrammarPoolContainer grammarContainer) {

        // register component's recognized features
        final String[] recognizedFeatures = component.getRecognizedFeatures();
        addRecognizedFeatures(recognizedFeatures);

        // register component's recognized properties
        final String[] recognizedProperties = component.getRecognizedProperties();
        addRecognizedProperties(recognizedProperties);

        // set default values
        setFeatureDefaults(component, recognizedFeatures, grammarContainer);
        setPropertyDefaults(component, recognizedProperties);
    }

    /** Calls reset on each of the components owned by this component manager. **/
    public void reset() throws XNIException {
        fNamespaceContext.reset();
        fValidationManager.reset();
        fEntityManager.reset(this);
        fErrorReporter.reset(this);
        fSchemaValidator.reset(this);
        // Mark configuration as fixed.
        fConfigUpdated = false;
    }

    void setErrorHandler(ErrorHandler errorHandler) {
        fErrorHandler = errorHandler;
        setProperty(ERROR_HANDLER, (errorHandler != null) ? new ErrorHandlerWrapper(errorHandler) :
                new ErrorHandlerWrapper(DraconianErrorHandler.getInstance()));
    }

    ErrorHandler getErrorHandler() {
        return fErrorHandler;
    }

    void setResourceResolver(LSResourceResolver resourceResolver) {
        fResourceResolver = resourceResolver;
        setProperty(ENTITY_RESOLVER, new DOMEntityResolverWrapper(resourceResolver));
    }

    LSResourceResolver getResourceResolver() {
        return fResourceResolver;
    }

    void setLocale(Locale locale) {
        fLocale = locale;
        fErrorReporter.setLocale(locale);
    }

    Locale getLocale() {
        return fLocale;
    }

    /** Cleans out configuration, restoring it to its initial state. */
    void restoreInitialState() {
        fConfigUpdated = true;

        // Remove error resolver and error handler
        fComponents.put(ENTITY_RESOLVER, null);
        fComponents.put(ERROR_HANDLER, null);

        // Set the Locale back to null.
        setLocale(null);
        fComponents.put(LOCALE, null);

        // Restore initial security manager
        fComponents.put(SECURITY_MANAGER, fInitSecurityManager);

        // Set the Locale back to null.
        setLocale(null);
        fComponents.put(LOCALE, null);

        // Reset feature and property values to their initial values
        if (!fInitFeatures.isEmpty()) {
            Iterator iter = fInitFeatures.entrySet().iterator();
            while (iter.hasNext()) {
                Map.Entry entry = (Map.Entry) iter.next();
                String name = (String) entry.getKey();
                boolean value = ((Boolean) entry.getValue()).booleanValue();
                super.setFeature(name, value);
            }
            fInitFeatures.clear();
        }
        if (!fInitProperties.isEmpty()) {
            Iterator iter = fInitProperties.entrySet().iterator();
            while (iter.hasNext()) {
                Map.Entry entry = (Map.Entry) iter.next();
                String name = (String) entry.getKey();
                Object value = entry.getValue();
                super.setProperty(name, value);
            }
            fInitProperties.clear();
        }
    }

    /** Sets feature defaults for the given component on this configuration. */
    private void setFeatureDefaults(final XMLComponent component,
            final String [] recognizedFeatures, XSGrammarPoolContainer grammarContainer) {
        if (recognizedFeatures != null) {
            for (int i = 0; i < recognizedFeatures.length; ++i) {
                String featureId = recognizedFeatures[i];
                Boolean state = grammarContainer.getFeature(featureId);
                if (state == null) {
                    state = component.getFeatureDefault(featureId);
                }
                if (state != null) {
                    // Do not overwrite values already set on the configuration.
                    if (!fFeatures.containsKey(featureId)) {
                        fFeatures.put(featureId, state);
                        // For newly added components who recognize this feature
                        // but did not offer a default value, we need to make
                        // sure these components will get an opportunity to read
                        // the value before parsing begins.
                        fConfigUpdated = true;
                    }
                }
            }
        }
    }

    /** Sets property defaults for the given component on this configuration. */
    private void setPropertyDefaults(final XMLComponent component, final String [] recognizedProperties) {
        if (recognizedProperties != null) {
            for (int i = 0; i < recognizedProperties.length; ++i) {
                String propertyId = recognizedProperties[i];
                Object value = component.getPropertyDefault(propertyId);
                if (value != null) {
                    // Do not overwrite values already set on the configuration.
                    if (!fProperties.containsKey(propertyId)) {
                        fProperties.put(propertyId, value);
                        // For newly added components who recognize this property
                        // but did not offer a default value, we need to make
                        // sure these components will get an opportunity to read
                        // the value before parsing begins.
                        fConfigUpdated = true;
                    }
                }
            }
        }
    }

} // XMLSchemaValidatorComponentManager
