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Xerces2 is the next generation of high performance, fully compliant XML parsers in the Apache Xerces family. This new version of Xerces introduces the Xerces Native Interface (XNI), a complete framework for building parser components and configurations that is extremely modular and easy to program. The Apache Xerces2 parser is the reference implementation of XNI but other parser components, configurations, and parsers can be written using the Xerces Native Interface. For complete design and implementation documents, refer to the XNI Manual. Xerces2 is a fully conforming XML Schema 1.0 processor. A partial experimental implementation of the XML Schema 1.1 Structures and Datatypes Working Drafts (December 2009) and an experimental implementation of the XML Schema Definition Language (XSD): Component Designators (SCD) Candidate Recommendation (January 2010) are provided for evaluation. For more information, refer to the XML Schema page. Xerces2 also provides a complete implementation of the Document Object Model Level 3 Core and Load/Save W3C Recommendations and provides a complete implementation of the XML Inclusions (XInclude) W3C Recommendation. It also provides support for OASIS XML Catalogs v1.1. Xerces2 is able to parse documents written according to the XML 1.1 Recommendation, except that it does not yet provide an option to enable normalization checking as described in section 2.13 of this specification. It also handles namespaces according to the XML Namespaces 1.1 Recommendation, and will correctly serialize XML 1.1 documents if the DOM level 3 load/save APIs are in use.

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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 org.apache.xerces.impl.validation;

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

import org.apache.xerces.impl.dv.ValidationContext;
import org.apache.xerces.util.SymbolTable;
import org.apache.xerces.xni.NamespaceContext;

/**
 * Implementation of the ValidationContext interface. Used to establish an
 * environment for simple type validation.
 * 
 * @xerces.internal
 *
 * @author Elena Litani, IBM
 * @version $Id: ValidationState.java 1380445 2012-09-04 04:43:34Z mrglavas $
 */
public class ValidationState implements ValidationContext {

    //
    // private data
    //
    private boolean fExtraChecking              = true;
    private boolean fFacetChecking              = true;
    private boolean fNormalize                  = true;
    private boolean fNamespaces                 = true;

    private EntityState fEntityState            = null;
    private NamespaceContext fNamespaceContext  = null;
    private SymbolTable fSymbolTable            = null;
    private Locale fLocale                      = null;

    //REVISIT: Should replace with a lighter structure.
    private final HashMap fIdTable    = new HashMap();
    private final HashMap fIdRefTable = new HashMap();
    private final static Object fNullValue = new Object();

    //
    // public methods
    //
    public void setExtraChecking(boolean newValue) {
        fExtraChecking = newValue;
    }

    public void setFacetChecking(boolean newValue) {
        fFacetChecking = newValue;
    }

    public void setNormalizationRequired (boolean newValue) {
          fNormalize = newValue;
    }

    public void setUsingNamespaces (boolean newValue) {
          fNamespaces = newValue;
    }

    public void setEntityState(EntityState state) {
        fEntityState = state;
    }

    public void setNamespaceSupport(NamespaceContext namespace) {
        fNamespaceContext = namespace;
    }

    public void setSymbolTable(SymbolTable sTable) {
        fSymbolTable = sTable;
    }

    /**
     * return null if all IDREF values have a corresponding ID value;
     * otherwise return an iterator for all the IDREF values without
     * a matching ID value.
     */
    public Iterator checkIDRefID() {
        HashSet missingIDs = null;
        Iterator iter = fIdRefTable.keySet().iterator();
        String key;
        while (iter.hasNext()) {
            key = (String) iter.next();
            if (!fIdTable.containsKey(key)) {
                if (missingIDs == null) {
                    missingIDs = new HashSet();
                }
                missingIDs.add(key);
            }
        }
        return (missingIDs != null) ? missingIDs.iterator() : null;
    }

    public void reset () {
        fExtraChecking = true;
        fFacetChecking = true;
        fNamespaces = true;
        fIdTable.clear();
        fIdRefTable.clear();
        fEntityState = null;
        fNamespaceContext = null;
        fSymbolTable = null;
    }

    /**
     * The same validation state can be used to validate more than one (schema)
     * validation roots. Entity/Namespace/Symbol are shared, but each validation
     * root needs its own id/idref tables. So we need this method to reset only
     * the two tables.
     */
    public void resetIDTables() {
        fIdTable.clear();
        fIdRefTable.clear();
    }

    //
    // implementation of ValidationContext methods
    //

    // whether to do extra id/idref/entity checking
    public boolean needExtraChecking() {
        return fExtraChecking;
    }

    // whether to validate against facets
    public boolean needFacetChecking() {
        return fFacetChecking;
    }

    public boolean needToNormalize (){
        return fNormalize;
    }

    public boolean useNamespaces() {
        return fNamespaces;
    }

    // entity
    public boolean isEntityDeclared (String name) {
        if (fEntityState !=null) {
            return fEntityState.isEntityDeclared(getSymbol(name));
        }
        return false;
    }
    public boolean isEntityUnparsed (String name) {
        if (fEntityState !=null) {
            return fEntityState.isEntityUnparsed(getSymbol(name));
        }
        return false;
    }

    // id
    public boolean isIdDeclared(String name) {
        return fIdTable.containsKey(name);
    }
    public void addId(String name) {
        fIdTable.put(name, fNullValue);
    }

    // idref
    public void addIdRef(String name) {
        fIdRefTable.put(name, fNullValue);
    }
    // get symbols

    public String getSymbol (String symbol) {
        if (fSymbolTable != null)
            return fSymbolTable.addSymbol(symbol);
        // if there is no symbol table, we return java-internalized string,
        // because symbol table strings are also java-internalzied.
        // this guarantees that the returned string from this method can be
        // compared by reference with other symbol table string. -SG
        return symbol.intern();
    }
    // qname, notation
    public String getURI(String prefix) {
        if (fNamespaceContext !=null) {
            return fNamespaceContext.getURI(prefix);
        }
        return null;
    }
    
    // Locale
    
    public void setLocale(Locale locale) {
        fLocale = locale;
    }
    
    public Locale getLocale() {
        return fLocale;
    }
}