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XML Schema Object Model (XSOM) is a Java library that allows applications to easily parse XML Schema documents and inspect information in them. It is expected to be useful for applications that need to take XML Schema as an input.

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/*
 * Copyright (c) 1997, 2018 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Distribution License v. 1.0, which is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

package com.sun.xml.xsom.impl;

import com.sun.xml.xsom.SCD;
import com.sun.xml.xsom.XSAnnotation;
import com.sun.xml.xsom.XSComponent;
import com.sun.xml.xsom.XSSchemaSet;
import com.sun.xml.xsom.util.ComponentNameFunction;
import com.sun.xml.xsom.impl.parser.SchemaDocumentImpl;
import com.sun.xml.xsom.parser.SchemaDocument;
import org.xml.sax.Locator;

import javax.xml.namespace.NamespaceContext;
import java.text.ParseException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;

public abstract class ComponentImpl implements XSComponent
{
    protected ComponentImpl( SchemaDocumentImpl _owner, AnnotationImpl _annon, Locator _loc, ForeignAttributesImpl fa ) {
        this.ownerDocument = _owner;
        this.annotation = _annon;
        this.locator = _loc;
        this.foreignAttributes = fa;
    }

    protected final SchemaDocumentImpl ownerDocument;
    public SchemaImpl getOwnerSchema() {
        if(ownerDocument==null)
            return null;
        else
            return ownerDocument.getSchema();
    }

    public XSSchemaSet getRoot() {
        if(ownerDocument==null)
            return null;
        else
            return getOwnerSchema().getRoot();
    }

    public SchemaDocument getSourceDocument() {
        return ownerDocument;
    }

    private AnnotationImpl annotation;
    public final XSAnnotation getAnnotation() { return annotation; }

    public XSAnnotation getAnnotation(boolean createIfNotExist) {
        if(createIfNotExist && annotation==null) {
            annotation = new AnnotationImpl();
        }
        return annotation;
    }

    private final Locator locator;
    public final Locator getLocator() { return locator; }

    /**
     * Either {@link ForeignAttributesImpl} or {@link List}.
     *
     * Initially it's {@link ForeignAttributesImpl}, but it's lazily turned into
     * a list when necessary.
     */
    private Object foreignAttributes;

    public List getForeignAttributes() {
        Object t = foreignAttributes;

        if(t==null)
            return Collections.EMPTY_LIST;

        if(t instanceof List)
            return (List)t;

        t = foreignAttributes = convertToList((ForeignAttributesImpl)t);
        return (List)t;
    }

    public String getForeignAttribute(String nsUri, String localName) {
        for( ForeignAttributesImpl fa : getForeignAttributes() ) {
            String v = fa.getValue(nsUri,localName);
            if(v!=null) return v;
        }
        return null;
    }

    private List convertToList(ForeignAttributesImpl fa) {
        List lst = new ArrayList();
        while(fa!=null) {
            lst.add(fa);
            fa = fa.next;
        }
        return Collections.unmodifiableList(lst);
    }

    public Collection select(String scd, NamespaceContext nsContext) {
        try {
            return SCD.create(scd,nsContext).select(this);
        } catch (ParseException e) {
            throw new IllegalArgumentException(e);
        }
    }

    public XSComponent selectSingle(String scd, NamespaceContext nsContext) {
        try {
            return SCD.create(scd,nsContext).selectSingle(this);
        } catch (ParseException e) {
            throw new IllegalArgumentException(e);
        }
    }

    @Override
    public String toString() {
        return apply(new ComponentNameFunction());
    }
}