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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.dv;

import org.apache.xerces.impl.xs.util.ShortListImpl;
import org.apache.xerces.impl.xs.util.XSObjectListImpl;
import org.apache.xerces.xs.ShortList;
import org.apache.xerces.xs.XSConstants;
import org.apache.xerces.xs.XSObjectList;
import org.apache.xerces.xs.XSSimpleTypeDefinition;
import org.apache.xerces.xs.XSValue;

/**
 * Class to get the information back after content is validated. This info
 * would be filled by validate().
 * 
 * @xerces.internal 
 *
 * @author Neeraj Bajaj, Sun Microsystems, inc.
 *
 * @version $Id: ValidatedInfo.java 1026362 2010-10-22 15:15:18Z sandygao $
 */
public class ValidatedInfo implements XSValue {

    /**
     * The normalized value of a string value
     */
    public String normalizedValue;

    /**
     * The actual value from a string value (QName, Boolean, etc.)
     * An array of Objects if the type is a list.
     */
    public Object actualValue;

    /**
     * The type of the actual value. It's one of the _DT constants
     * defined in XSConstants.java. The value is used to indicate
     * the most specific built-in type.
     * (i.e. short instead of decimal or integer).
     */
    public short actualValueType;

    /**
     * The declared type of the value.
     */
    public XSSimpleType actualType;

    /**
     * If the type is a union type, then the member type which
     * actually validated the string value.
     */
    public XSSimpleType memberType;

    /**
     * If
     * 1. the type is a union type where one of the member types is a list, or
     *    if the type is a list; and
     * 2. the item type of the list is a union type
     * then an array of member types used to validate the values.
     */
    public XSSimpleType[] memberTypes;

    /**
     * In the case the value is a list or a list of unions, this value
     * indicates the type(s) of the items in the list.
     * For a normal list, the length of the array is 1; for list of unions,
     * the length of the array is the same as the length of the list.
     */
    public ShortList itemValueTypes;

    /**
     * reset the state of this object
     */
    public void reset() {
        this.normalizedValue = null;
        this.actualValue = null;
        this.actualValueType = XSConstants.UNAVAILABLE_DT;
        this.actualType = null;
        this.memberType = null;
        this.memberTypes = null;
        this.itemValueTypes = null;
    }
    
    /**
     * Return a string representation of the value. If there is an actual
     * value, use toString; otherwise, use the normalized value.
     */
    public String stringValue() {
        if (actualValue == null) {
            return normalizedValue;
        }
        else {
            return actualValue.toString();
        }
    }
    
    /**
     * Returns true if the two ValidatedInfo objects can be compared in the same
     * value space.
     */
    public static boolean isComparable(ValidatedInfo info1, ValidatedInfo info2) {
        final short primitiveType1 = convertToPrimitiveKind(info1.actualValueType);
        final short primitiveType2 = convertToPrimitiveKind(info2.actualValueType);
        if (primitiveType1 != primitiveType2) {    
            return (primitiveType1 == XSConstants.ANYSIMPLETYPE_DT && primitiveType2 == XSConstants.STRING_DT ||
                    primitiveType1 == XSConstants.STRING_DT && primitiveType2 == XSConstants.ANYSIMPLETYPE_DT);
        }
        else if (primitiveType1 == XSConstants.LIST_DT || primitiveType1 == XSConstants.LISTOFUNION_DT) {
            final ShortList typeList1 = info1.itemValueTypes;
            final ShortList typeList2 = info2.itemValueTypes;
            final int typeList1Length = typeList1 != null ? typeList1.getLength() : 0;
            final int typeList2Length = typeList2 != null ? typeList2.getLength() : 0;
            if (typeList1Length != typeList2Length) {
                return false;
            }
            for (int i = 0; i < typeList1Length; ++i) {
                final short primitiveItem1 = convertToPrimitiveKind(typeList1.item(i));
                final short primitiveItem2 = convertToPrimitiveKind(typeList2.item(i));
                if (primitiveItem1 != primitiveItem2) {
                    if (primitiveItem1 == XSConstants.ANYSIMPLETYPE_DT && primitiveItem2 == XSConstants.STRING_DT ||
                        primitiveItem1 == XSConstants.STRING_DT && primitiveItem2 == XSConstants.ANYSIMPLETYPE_DT) {
                        continue;
                    }
                    return false;
                }
            }
        }
        return true;
    }
    
    /**
     * Returns the primitive type of the given type.
     * @param valueType A value type as defined in XSConstants.
     * @return The primitive type from which valueType was derived.
     */
    private static short convertToPrimitiveKind(short valueType) {
        /** Primitive datatypes. */
        if (valueType <= XSConstants.NOTATION_DT) {
            return valueType;
        }
        /** Types derived from string. */
        if (valueType <= XSConstants.ENTITY_DT) {
            return XSConstants.STRING_DT;
        }
        /** Types derived from decimal. */
        if (valueType <= XSConstants.POSITIVEINTEGER_DT) {
            return XSConstants.DECIMAL_DT;
        }
        /** Other types. */
        return valueType;
    }

    // XSValue methods
    
    public Object getActualValue() {
        return actualValue;
    }

    public short getActualValueType() {
        return actualValueType;
    }

    public ShortList getListValueTypes() {
        return itemValueTypes == null ? ShortListImpl.EMPTY_LIST : itemValueTypes;
    }

    public XSObjectList getMemberTypeDefinitions() {
        if (memberTypes == null) {
            return XSObjectListImpl.EMPTY_LIST;
        }
        return new XSObjectListImpl(memberTypes, memberTypes.length);
    }

    public String getNormalizedValue() {
        return normalizedValue;
    }

    public XSSimpleTypeDefinition getTypeDefinition() {
        return actualType;
    }
    
    public XSSimpleTypeDefinition getMemberTypeDefinition() {
        return memberType;
    }

    public void copyFrom(XSValue o) {
        if (o == null) {
            reset();
        }
        else if (o instanceof ValidatedInfo) {
            ValidatedInfo other = (ValidatedInfo)o;
            normalizedValue = other.normalizedValue;
            actualValue = other.actualValue;
            actualValueType = other.actualValueType;
            actualType = other.actualType;
            memberType = other.memberType;
            memberTypes = other.memberTypes;
            itemValueTypes = other.itemValueTypes;
        }
        else {
            normalizedValue = o.getNormalizedValue();
            actualValue = o.getActualValue();
            actualValueType = o.getActualValueType();
            actualType = (XSSimpleType)o.getTypeDefinition();
            memberType = (XSSimpleType)o.getMemberTypeDefinition();
            XSSimpleType realType = memberType == null ? actualType : memberType;
            if (realType != null && realType.getBuiltInKind() == XSConstants.LISTOFUNION_DT) {
                XSObjectList members = o.getMemberTypeDefinitions();
                memberTypes = new XSSimpleType[members.getLength()];
                for (int i = 0; i < members.getLength(); i++) {
                    memberTypes[i] = (XSSimpleType)members.get(i);
                }
            }
            else {
                memberTypes = null;
            }
            itemValueTypes = o.getListValueTypes();
        }
    }
}