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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.scd;

/*-
 * #%L
 * XSOM
 * %%
 * Copyright (C) 2019 - 2020 Entur
 * %%
 * Licensed under the EUPL, Version 1.1 or – as soon they will be
 * approved by the European Commission - subsequent versions of the
 * EUPL (the "Licence");
 * 
 * You may not use this work except in compliance with the Licence.
 * You may obtain a copy of the Licence at:
 * 
 * http://ec.europa.eu/idabc/eupl5
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the Licence is distributed on an "AS IS" basis,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing permissions and
 * limitations under the Licence.
 * #L%
 */

import com.sun.xml.xsom.XSAnnotation;
import com.sun.xml.xsom.XSAttGroupDecl;
import com.sun.xml.xsom.XSAttributeDecl;
import com.sun.xml.xsom.XSAttributeUse;
import com.sun.xml.xsom.XSComplexType;
import com.sun.xml.xsom.XSComponent;
import com.sun.xml.xsom.XSContentType;
import com.sun.xml.xsom.XSElementDecl;
import com.sun.xml.xsom.XSFacet;
import com.sun.xml.xsom.XSIdentityConstraint;
import com.sun.xml.xsom.XSModelGroup;
import com.sun.xml.xsom.XSModelGroupDecl;
import com.sun.xml.xsom.XSNotation;
import com.sun.xml.xsom.XSParticle;
import com.sun.xml.xsom.XSSchema;
import com.sun.xml.xsom.XSSimpleType;
import com.sun.xml.xsom.XSWildcard;
import com.sun.xml.xsom.XSXPath;
import com.sun.xml.xsom.visitor.XSFunction;

import java.util.Iterator;

/**
 * Partial default implementation of {@link Axis}.
 *
 * 
 * {@link XSParticle}s are skipped in SCD, so this class compensates that.
 * For example, when we are considering a path from {@link XSComplexType},
 * we need to also consider a path from its content type particle (if any.)
 *
 * @author Kohsuke Kawaguchi
 */
abstract class AbstractAxisImpl implements Axis, XSFunction> {
    /**
     * Creates a singleton list.
     */
    protected final Iterator singleton(T t) {
        return Iterators.singleton(t);
    }

    protected final Iterator union(T... items) {
        return new Iterators.Array(items);
    }

    protected final Iterator union(Iterator first, Iterator second) {
        return new Iterators.Union(first,second);
    }

    public Iterator iterator(XSComponent contextNode) {
        return contextNode.apply(this);
    }

    /**
     * Gets the prefix of the axis, like "foo::".
     */
    public String getName() {
        return toString();
    }

    /**
     * Default implementation that simply delegate sto {@link #iterator(XSComponent)}
     */
    public Iterator iterator(Iterator contextNodes) {
        return new Iterators.Map(contextNodes) {
            protected Iterator apply(XSComponent u) {
                return iterator(u);
            }
        };
    }

    public boolean isModelGroup() {
        return false;
    }

    public Iterator annotation(XSAnnotation ann) {
        return empty();
    }

    public Iterator attGroupDecl(XSAttGroupDecl decl) {
        return empty();
    }

    public Iterator attributeDecl(XSAttributeDecl decl) {
        return empty();
    }

    public Iterator attributeUse(XSAttributeUse use) {
        return empty();
    }

    public Iterator complexType(XSComplexType type) {
        // compensate particle
        XSParticle p = type.getContentType().asParticle();
        if(p!=null)
            return particle(p);
        else
            return empty();
    }

    public Iterator schema(XSSchema schema) {
        return empty();
    }

    public Iterator facet(XSFacet facet) {
        return empty();
    }

    public Iterator notation(XSNotation notation) {
        return empty();
    }

    public Iterator identityConstraint(XSIdentityConstraint decl) {
        return empty();
    }

    public Iterator xpath(XSXPath xpath) {
        return empty();
    }

    public Iterator simpleType(XSSimpleType simpleType) {
        return empty();
    }

    public Iterator particle(XSParticle particle) {
        return empty();
    }

    public Iterator empty(XSContentType empty) {
        return empty();
    }

    public Iterator wildcard(XSWildcard wc) {
        return empty();
    }

    public Iterator modelGroupDecl(XSModelGroupDecl decl) {
        return empty();
    }

    public Iterator modelGroup(XSModelGroup group) {
        // compensate for particles that are ignored in SCD
        return new Iterators.Map(group.iterator()) {
            protected Iterator apply(XSParticle p) {
                return particle(p);
            }
        };
    }

    public Iterator elementDecl(XSElementDecl decl) {
        return empty();
    }

    /**
     * Returns an empty list.
     */
    protected final Iterator empty() {
        return Iterators.empty();
    }

}