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	/*
	* Copyright (c) 2016, 2017, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	package jdk.xml.internal;

	import javax.xml.XMLConstants;
	import static jdk.xml.internal.JdkXmlUtils.OVERRIDE_PARSER;
	import static jdk.xml.internal.JdkXmlUtils.SP_USE_CATALOG;
	import static jdk.xml.internal.JdkXmlUtils.RESET_SYMBOL_TABLE;

	/**
	* This class manages JDK's XML Features. Previously added features and properties
	* may be gradually moved to this class.
	*/
	public class JdkXmlFeatures {
	public static final String ORACLE_JAXP_PROPERTY_PREFIX =
	"http://www.oracle.com/xml/jaxp/properties/";

	public static final String XML_FEATURE_MANAGER =
	ORACLE_JAXP_PROPERTY_PREFIX + "XmlFeatureManager";

	public static final String ORACLE_FEATURE_SERVICE_MECHANISM =
	"http://www.oracle.com/feature/use-service-mechanism";

	/**
	* Feature enableExtensionFunctions
	*/
	public static final String ORACLE_ENABLE_EXTENSION_FUNCTION =
	ORACLE_JAXP_PROPERTY_PREFIX + "enableExtensionFunctions";
	public static final String SP_ENABLE_EXTENSION_FUNCTION =
	"javax.xml.enableExtensionFunctions";
	// This is the correct name by the spec
	public static final String SP_ENABLE_EXTENSION_FUNCTION_SPEC =
	"jdk.xml.enableExtensionFunctions";
	public static final String CATALOG_FEATURES = "javax.xml.catalog.catalogFeatures";

	public final static String PROPERTY_USE_CATALOG = XMLConstants.USE_CATALOG;

	public static enum XmlFeature {
	/**
	* Feature enableExtensionFunctions
	* FSP: extension function is enforced by FSP. When FSP is on, extension
	* function is disabled.
	*/
	ENABLE_EXTENSION_FUNCTION(ORACLE_ENABLE_EXTENSION_FUNCTION, SP_ENABLE_EXTENSION_FUNCTION_SPEC,
	ORACLE_ENABLE_EXTENSION_FUNCTION, SP_ENABLE_EXTENSION_FUNCTION,
	true, false, true, true),
	/**
	* The {@link javax.xml.XMLConstants.USE_CATALOG} feature.
	* FSP: USE_CATALOG is not enforced by FSP.
	*/
	USE_CATALOG(PROPERTY_USE_CATALOG, SP_USE_CATALOG,
	null, null,
	true, false, true, false),

	/**
	* Feature resetSymbolTable
	* FSP: RESET_SYMBOL_TABLE_FEATURE is not enforced by FSP.
	*/
	RESET_SYMBOL_TABLE_FEATURE(RESET_SYMBOL_TABLE, RESET_SYMBOL_TABLE,
	null, null,
	false, false, true, false),

	/**
	* Feature overrideDefaultParser
	* FSP: not enforced by FSP.
	*/
	JDK_OVERRIDE_PARSER(OVERRIDE_PARSER, OVERRIDE_PARSER,
	ORACLE_FEATURE_SERVICE_MECHANISM, ORACLE_FEATURE_SERVICE_MECHANISM,
	false, false, true, false);

	private final String name;
	private final String nameSP;
	private final String nameOld;
	private final String nameOldSP;
	private final boolean valueDefault;
	private final boolean valueEnforced;
	private final boolean hasSystem;
	private final boolean enforced;

	/**
	* Constructs an XmlFeature instance.
	* @param name the name of the feature
	* @param nameSP the name of the System Property
	* @param nameOld the name of the corresponding legacy property
	* @param nameOldSP the system property of the legacy property
	* @param value the value of the feature
	* @param hasSystem a flag to indicate whether the feature is supported
	* @param enforced a flag indicating whether the feature is
	* FSP (Feature_Secure_Processing) enforced
	* with a System property
	*/
	XmlFeature(String name, String nameSP, String nameOld, String nameOldSP,
	boolean value, boolean valueEnforced, boolean hasSystem, boolean enforced) {
	this.name = name;
	this.nameSP = nameSP;
	this.nameOld = nameOld;
	this.nameOldSP = nameOldSP;
	this.valueDefault = value;
	this.valueEnforced = valueEnforced;
	this.hasSystem = hasSystem;
	this.enforced = enforced;
	}

	/**
	* Checks whether the specified property is equal to the current property.
	* @param propertyName the name of a property
	* @return true if the specified property is the current property, false
	* otherwise
	*/
	boolean equalsPropertyName(String propertyName) {
	return name.equals(propertyName) \|\|
	(nameOld != null && nameOld.equals(propertyName));
	}

	/**
	* Returns the name of the property.
	*
	* @return the name of the property
	*/
	public String apiProperty() {
	return name;
	}

	/**
	* Returns the name of the corresponding System Property.
	*
	* @return the name of the System Property
	*/
	String systemProperty() {
	return nameSP;
	}

	/**
	* Returns the name of the legacy System Property.
	*
	* @return the name of the legacy System Property
	*/
	String systemPropertyOld() {
	return nameOldSP;
	}

	/**
	* Returns the default value of the property.
	* @return the default value of the property
	*/
	public boolean defaultValue() {
	return valueDefault;
	}

	/**
	* Returns the FSP-enforced value.
	* @return the FSP-enforced value
	*/
	public boolean enforcedValue() {
	return valueEnforced;
	}

	/**
	* Checks whether System property is supported for the feature.
	* @return true it is supported, false otherwise
	*/
	boolean hasSystemProperty() {
	return hasSystem;
	}

	/**
	* Checks whether the property is enforced by FSP
	* @return true it is, false otherwise
	*/
	boolean enforced() {
	return enforced;
	}

	}

	/**
	* States of the settings of a property, in the order: default value, value
	* set by FEATURE_SECURE_PROCESSING, jaxp.properties file, jaxp system
	* properties, and jaxp api properties
	*/
	public static enum State {
	//this order reflects the overriding order

	DEFAULT("default"), FSP("FEATURE_SECURE_PROCESSING"),
	JAXPDOTPROPERTIES("jaxp.properties"), SYSTEMPROPERTY("system property"),
	APIPROPERTY("property");

	final String literal;
	State(String literal) {
	this.literal = literal;
	}

	String literal() {
	return literal;
	}
	}

	/**
	* Values of the features
	*/
	private final boolean[] featureValues;

	/**
	* States of the settings for each property
	*/
	private final State[] states;

	/**
	* Flag indicating if secure processing is set
	*/
	boolean secureProcessing;

	/**
	* Instantiate JdkXmlFeatures and initialize the fields
	* @param secureProcessing
	*/
	public JdkXmlFeatures(boolean secureProcessing) {
	featureValues = new boolean[XmlFeature.values().length];
	states = new State[XmlFeature.values().length];
	this.secureProcessing = secureProcessing;
	for (XmlFeature f : XmlFeature.values()) {
	if (secureProcessing && f.enforced()) {
	featureValues[f.ordinal()] = f.enforcedValue();
	states[f.ordinal()] = State.FSP;
	} else {
	featureValues[f.ordinal()] = f.defaultValue();
	states[f.ordinal()] = State.DEFAULT;
	}
	}
	//read system properties or jaxp.properties
	readSystemProperties();
	}

	/**
	* Updates the JdkXmlFeatures instance by reading the system properties again.
	* This will become necessary in case the system properties are set after
	* the instance has been created.
	*/
	public void update() {
	readSystemProperties();
	}

	/**
	* Set feature by property name and state
	* @param propertyName property name
	* @param state the state of the property
	* @param value the value of the property
	* @return true if the property is managed by the JdkXmlFeatures instance;
	* false otherwise.
	*/
	public boolean setFeature(String propertyName, State state, Object value) {
	int index = getIndex(propertyName);
	if (index > -1) {
	setFeature(index, state, value);
	return true;
	}
	return false;
	}

	/**
	* Set the value for a specific feature.
	*
	* @param feature the feature
	* @param state the state of the property
	* @param value the value of the property
	*/
	public void setFeature(XmlFeature feature, State state, boolean value) {
	setFeature(feature.ordinal(), state, value);
	}

	/**
	* Return the value of the specified property
	*
	* @param feature the property
	* @return the value of the property
	*/
	public boolean getFeature(XmlFeature feature) {
	return featureValues[feature.ordinal()];
	}

	/**
	* Return the value of a feature by its index (the Feature's ordinal)
	* @param index the index of a feature
	* @return value of a feature
	*/
	public boolean getFeature(int index) {
	return featureValues[index];
	}

	/**
	* Set the value of a property by its index
	*
	* @param index the index of the property
	* @param state the state of the property
	* @param value the value of the property
	*/
	public void setFeature(int index, State state, Object value) {
	boolean temp;
	if (Boolean.class.isAssignableFrom(value.getClass())) {
	temp = (Boolean)value;
	} else {
	temp = Boolean.parseBoolean((String) value);
	}
	setFeature(index, state, temp);
	}

	/**
	* Set the value of a property by its index
	*
	* @param index the index of the property
	* @param state the state of the property
	* @param value the value of the property
	*/
	public void setFeature(int index, State state, boolean value) {
	//only update if it shall override
	if (state.compareTo(states[index]) >= 0) {
	featureValues[index] = value;
	states[index] = state;
	}
	}

	/**
	* Get the index by property name
	*
	* @param propertyName property name
	* @return the index of the property if found; return -1 if not
	*/
	public int getIndex(String propertyName) {
	for (XmlFeature feature : XmlFeature.values()) {
	if (feature.equalsPropertyName(propertyName)) {
	//internally, ordinal is used as index
	return feature.ordinal();
	}
	}
	return -1;
	}

	/**
	* Read from system properties, or those in jaxp.properties
	*/
	private void readSystemProperties() {
	for (XmlFeature feature : XmlFeature.values()) {
	if (!getSystemProperty(feature, feature.systemProperty())) {
	//if system property is not found, try the older form if any
	String oldName = feature.systemPropertyOld();
	if (oldName != null) {
	getSystemProperty(feature, oldName);
	}
	}
	}
	}

	/**
	* Read from system properties, or those in jaxp.properties
	*
	* @param property the type of the property
	* @param sysPropertyName the name of system property
	* @return true if the system property is found, false otherwise
	*/
	private boolean getSystemProperty(XmlFeature feature, String sysPropertyName) {
	try {
	String value = SecuritySupport.getSystemProperty(sysPropertyName);
	if (value != null && !value.equals("")) {
	setFeature(feature, State.SYSTEMPROPERTY, Boolean.parseBoolean(value));
	return true;
	}

	value = SecuritySupport.readJAXPProperty(sysPropertyName);
	if (value != null && !value.equals("")) {
	setFeature(feature, State.JAXPDOTPROPERTIES, Boolean.parseBoolean(value));
	return true;
	}
	} catch (NumberFormatException e) {
	//invalid setting
	throw new NumberFormatException("Invalid setting for system property: " + feature.systemProperty());
	}
	return false;
	}

	}

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