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  /*
   * Copyright 1999-2004 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.
   */
  // $Id: XPathFactoryImpl.java,v 1.2 2005/08/16 22:41:13 jeffsuttor Exp $
  
  package jaxp.sun.org.apache.xpath.internal.jaxp;
  
  import jaxp.sun.org.apache.xalan.internal.XalanConstants;
  import jaxp.sun.org.apache.xpath.internal.res.XPATHErrorResources;
  import jaxp.sun.org.apache.xalan.internal.res.XSLMessages;
  import jaxp.sun.org.apache.xalan.internal.utils.FeatureManager;
  import jaxp.sun.org.apache.xalan.internal.utils.FeaturePropertyBase;
  
  import jaxp.xml.XMLConstants;
  import jaxp.xml.xpath.XPath;
  import jaxp.xml.xpath.XPathFactory;
  import jaxp.xml.xpath.XPathFactoryConfigurationException;
  import jaxp.xml.xpath.XPathFunctionResolver;
  import jaxp.xml.xpath.XPathVariableResolver;
  
  /**
   * The XPathFactory builds XPaths.
   *
   * @version $Revision: 1.11 $
   * @author  Ramesh Mandava
   */
  public  class XPathFactoryImpl extends XPathFactory {
  
          /**
           * <p>Name of class as a constant to use for debugging.</p>
           */
          private static final String CLASS_NAME = "XPathFactoryImpl";
  
          /**
           *<p>XPathFunctionResolver for this XPathFactory and created XPaths.</p>
           */
          private XPathFunctionResolver xPathFunctionResolver = null;
  
          /**
           * <p>XPathVariableResolver for this XPathFactory and created XPaths</p>
           */
          private XPathVariableResolver xPathVariableResolver = null;
  
          /**
           * <p>State of secure processing feature.</p>
           */
          private boolean _isNotSecureProcessing = true;
          /**
           * <p>State of secure mode.</p>
           */
          private boolean _isSecureMode = false;
          /**
           * javax.xml.xpath.XPathFactory implementation.
           */
  
          private boolean _useServicesMechanism = true;
  
          private final FeatureManager _featureManager;
  
          public XPathFactoryImpl() {
              this(true);
          }
  
          public static XPathFactory newXPathFactoryNoServiceLoader() {
              return new XPathFactoryImpl(false);
          }
  
          public XPathFactoryImpl(boolean useServicesMechanism) {
              _featureManager = new FeatureManager();
              if (System.getSecurityManager() != null) {
                  _isSecureMode = true;
                  _isNotSecureProcessing = false;
                  _featureManager.setValue(FeatureManager.Feature.ORACLE_ENABLE_EXTENSION_FUNCTION,
                          FeaturePropertyBase.State.FSP, XalanConstants.FEATURE_FALSE);
              }
              this._useServicesMechanism = useServicesMechanism;
          }
          /**
           * <p>Is specified object model supported by this
           * <code>XPathFactory</code>?</p>
           *
           * @param objectModel Specifies the object model which the returned
           * <code>XPathFactory</code> will understand.
           *
           * @return <code>true</code> if <code>XPathFactory</code> supports
           * <code>objectModel</code>, else <code>false</code>.
           *
           * @throws NullPointerException If <code>objectModel</code> is <code>null</code>.
           * @throws IllegalArgumentException If <code>objectModel.length() == 0</code>.
           */
          public boolean isObjectModelSupported(String objectModel) {
  
              if (objectModel == null) {
                  String fmsg = XSLMessages.createXPATHMessage(
                          XPATHErrorResources.ER_OBJECT_MODEL_NULL,
                          new Object[] { this.getClass().getName() } );
  
                  throw new NullPointerException( fmsg );
              }
  
              if (objectModel.length() == 0) {
                  String fmsg = XSLMessages.createXPATHMessage(
                          XPATHErrorResources.ER_OBJECT_MODEL_EMPTY,
                          new Object[] { this.getClass().getName() } );
                  throw new IllegalArgumentException( fmsg );
              }
  
              // know how to support default object model, W3C DOM
              if (objectModel.equals(XPathFactory.DEFAULT_OBJECT_MODEL_URI)) {
                  return true;
              }
  
              // don't know how to support anything else
              return false;
          }
  
          /**
           * <p>Returns a new <code>XPath</code> object using the underlying
           * object model determined when the factory was instantiated.</p>
           *
           * @return New <code>XPath</code>
           */
          public XPath newXPath() {
              return new XPathImpl(
                      xPathVariableResolver, xPathFunctionResolver,
                      !_isNotSecureProcessing, _useServicesMechanism,
                      _featureManager );
          }
  
          /**
           * <p>Set a feature for this <code>XPathFactory</code> and
           * <code>XPath</code>s created by this factory.</p>
           *
           * <p>
           * Feature names are fully qualified {@link java.net.URI}s.
           * Implementations may define their own features.
           * An {@link XPathFactoryConfigurationException} is thrown if this
           * <code>XPathFactory</code> or the <code>XPath</code>s
           *  it creates cannot support the feature.
           * It is possible for an <code>XPathFactory</code> to expose a feature
           * value but be unable to change its state.
           * </p>
           *
           * <p>See {@link XPathFactory} for full documentation
           * of specific features.</p>
           *
           * @param name Feature name.
           * @param value Is feature state <code>true</code> or <code>false</code>.
           *
           * @throws XPathFactoryConfigurationException if this
           * <code>XPathFactory</code> or the <code>XPath</code>s
           *   it creates cannot support this feature.
           * @throws NullPointerException if <code>name</code> is
           * <code>null</code>.
           */
          public void setFeature(String name, boolean value)
                  throws XPathFactoryConfigurationException {
  
              // feature name cannot be null
              if (name == null) {
                  String fmsg = XSLMessages.createXPATHMessage(
                          XPATHErrorResources.ER_FEATURE_NAME_NULL,
                          new Object[] { CLASS_NAME, new Boolean( value) } );
                  throw new NullPointerException( fmsg );
               }
  
              // secure processing?
              if (name.equals(XMLConstants.FEATURE_SECURE_PROCESSING)) {
                  if ((_isSecureMode) && (!value)) {
                      String fmsg = XSLMessages.createXPATHMessage(
                              XPATHErrorResources.ER_SECUREPROCESSING_FEATURE,
                              new Object[] { name, CLASS_NAME, new Boolean(value) } );
                      throw new XPathFactoryConfigurationException( fmsg );
                  }
  
                  _isNotSecureProcessing = !value;
                  if (value && _featureManager != null) {
                      _featureManager.setValue(FeatureManager.Feature.ORACLE_ENABLE_EXTENSION_FUNCTION,
                              FeaturePropertyBase.State.FSP, XalanConstants.FEATURE_FALSE);
                  }
  
                  // all done processing feature
                  return;
              }
              if (name.equals(XalanConstants.ORACLE_FEATURE_SERVICE_MECHANISM)) {
                  //in secure mode, let _useServicesMechanism be determined by the constructor
                  if (!_isSecureMode)
                      _useServicesMechanism = value;
                  return;
              }
  
              if (_featureManager != null &&
                      _featureManager.setValue(name, FeaturePropertyBase.State.APIPROPERTY, value)) {
                  return;
              }
  
              // unknown feature
              String fmsg = XSLMessages.createXPATHMessage(
                      XPATHErrorResources.ER_FEATURE_UNKNOWN,
                      new Object[] { name, CLASS_NAME, new Boolean(value) } );
              throw new XPathFactoryConfigurationException( fmsg );
          }
  
          /**
           * <p>Get the state of the named feature.</p>
           *
           * <p>
           * Feature names are fully qualified {@link java.net.URI}s.
           * Implementations may define their own features.
           * An {@link XPathFactoryConfigurationException} is thrown if this
           * <code>XPathFactory</code> or the <code>XPath</code>s
           * it creates cannot support the feature.
           * It is possible for an <code>XPathFactory</code> to expose a feature
           * value but be unable to change its state.
           * </p>
           *
           * @param name Feature name.
           *
           * @return State of the named feature.
           *
           * @throws XPathFactoryConfigurationException if this
           * <code>XPathFactory</code> or the <code>XPath</code>s
           *   it creates cannot support this feature.
           * @throws NullPointerException if <code>name</code> is
           * <code>null</code>.
           */
          public boolean getFeature(String name)
                  throws XPathFactoryConfigurationException {
  
              // feature name cannot be null
              if (name == null) {
                  String fmsg = XSLMessages.createXPATHMessage(
                          XPATHErrorResources.ER_GETTING_NULL_FEATURE,
                          new Object[] { CLASS_NAME } );
                  throw new NullPointerException( fmsg );
              }
  
              // secure processing?
              if (name.equals(XMLConstants.FEATURE_SECURE_PROCESSING)) {
                  return !_isNotSecureProcessing;
              }
              if (name.equals(XalanConstants.ORACLE_FEATURE_SERVICE_MECHANISM)) {
                  return _useServicesMechanism;
              }
  
              /** Check to see if the property is managed by the security manager **/
              String propertyValue = (_featureManager != null) ?
                      _featureManager.getValueAsString(name) : null;
              if (propertyValue != null) {
                  return _featureManager.isFeatureEnabled(name);
              }
  
              // unknown feature
              String fmsg = XSLMessages.createXPATHMessage(
                      XPATHErrorResources.ER_GETTING_UNKNOWN_FEATURE,
                      new Object[] { name, CLASS_NAME } );
  
              throw new XPathFactoryConfigurationException( fmsg );
          }
  
          /**
           * <p>Establish a default function resolver.</p>
           *
           * <p>Any <code>XPath</code> objects constructed from this factory will use
           * the specified resolver by default.</p>
           *
           * <p>A <code>NullPointerException</code> is thrown if
           * <code>resolver</code> is <code>null</code>.</p>
           *
           * @param resolver XPath function resolver.
           *
           * @throws NullPointerException If <code>resolver</code> is
           * <code>null</code>.
           */
          public void setXPathFunctionResolver(XPathFunctionResolver resolver) {
  
              // resolver cannot be null
              if (resolver == null) {
                  String fmsg = XSLMessages.createXPATHMessage(
                          XPATHErrorResources.ER_NULL_XPATH_FUNCTION_RESOLVER,
                          new Object[] {  CLASS_NAME } );
                  throw new NullPointerException( fmsg );
              }
  
              xPathFunctionResolver = resolver;
          }
  
          /**
           * <p>Establish a default variable resolver.</p>
           *
           * <p>Any <code>XPath</code> objects constructed from this factory will use
           * the specified resolver by default.</p>
           *
           * <p>A <code>NullPointerException</code> is thrown if <code>resolver</code> is <code>null</code>.</p>
           *
           * @param resolver Variable resolver.
           *
           *  @throws NullPointerException If <code>resolver</code> is
           * <code>null</code>.
           */
          public void setXPathVariableResolver(XPathVariableResolver resolver) {
  
                  // resolver cannot be null
                  if (resolver == null) {
                      String fmsg = XSLMessages.createXPATHMessage(
                              XPATHErrorResources.ER_NULL_XPATH_VARIABLE_RESOLVER,
                              new Object[] {  CLASS_NAME } );
                      throw new NullPointerException( fmsg );
                  }
  
                  xPathVariableResolver = resolver;
          }
  }
  