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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

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package com.sun.xml.internal.xsom.impl.parser;

import com.sun.xml.internal.xsom.impl.SchemaImpl;

import com.sun.xml.internal.xsom.parser.SchemaDocument;

import java.util.Collections;

import java.util.HashSet;

import java.util.Set;

/**

 * {@link SchemaDocument} implementation.

 *

 * @author Kohsuke Kawaguchi

 */

public final class SchemaDocumentImpl implements SchemaDocument

{

    private final SchemaImpl schema;

    /**

     * URI of the schema document to be parsed. Can be null.

     */

    private final String schemaDocumentURI;

    /**

     * {@link SchemaDocumentImpl}s that are referenced from this document.

     */

    final Set<SchemaDocumentImpl> references = new HashSet<SchemaDocumentImpl>();

    /**

     * {@link SchemaDocumentImpl}s that are referencing this document.

     */

    final Set<SchemaDocumentImpl> referers = new HashSet<SchemaDocumentImpl>();

    protected SchemaDocumentImpl(SchemaImpl schema, String _schemaDocumentURI) {

        this.schema = schema;

        this.schemaDocumentURI = _schemaDocumentURI;

    }

    public String getSystemId() {

        return schemaDocumentURI;

    }

    public String getTargetNamespace() {

        return schema.getTargetNamespace();

    }

    public SchemaImpl getSchema() {

        return schema;

    }

    public Set<SchemaDocument> getReferencedDocuments() {

        return Collections.<SchemaDocument>unmodifiableSet(references);

    }

    public Set<SchemaDocument> getIncludedDocuments() {

        return getImportedDocuments(this.getTargetNamespace());

    }

    public Set<SchemaDocument> getImportedDocuments(String targetNamespace) {

        if(targetNamespace==null)

            throw new IllegalArgumentException();

        Set<SchemaDocument> r = new HashSet<SchemaDocument>();

        for (SchemaDocumentImpl doc : references) {

            if(doc.getTargetNamespace().equals(targetNamespace))

                r.add(doc);

        }

        return Collections.unmodifiableSet(r);

    }

    public boolean includes(SchemaDocument doc) {

        if(!references.contains(doc))

            return false;

        return doc.getSchema()==schema;

    }

    public boolean imports(SchemaDocument doc) {

        if(!references.contains(doc))

            return false;

        return doc.getSchema()!=schema;

    }

    public Set<SchemaDocument> getReferers() {

        return Collections.<SchemaDocument>unmodifiableSet(referers);

    }

    @Override

    public boolean equals(Object o) {

        SchemaDocumentImpl rhs = (SchemaDocumentImpl) o;

        if( this.schemaDocumentURI==null || rhs.schemaDocumentURI==null)

            return this==rhs;

        if(!schemaDocumentURI.equals(rhs.schemaDocumentURI) )

            return false;

        return this.schema==rhs.schema;

    }

    @Override

    public int hashCode() {

        if (schemaDocumentURI==null)

            return super.hashCode();

        if (schema == null) {

            return schemaDocumentURI.hashCode();

        }

        return schemaDocumentURI.hashCode()^this.schema.hashCode();

    }

}