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package com.sun.xml.xsom;

import javax.xml.namespace.NamespaceContext;
import java.util.Iterator;
import java.util.Collection;

/**
 * Set of {@link XSSchema} objects.
 * 
 * @author
 *  Kohsuke Kawaguchi (kohsuke.kawaguchi@sun.com)
 */
public interface XSSchemaSet
{
    XSSchema getSchema(String targetNamespace);
    XSSchema getSchema(int idx);
    int getSchemaSize();
    Iterator<XSSchema> iterateSchema();

    /**
     * Gets all {@link XSSchema}s in a single collection.
     */
    Collection<XSSchema> getSchemas();

    XSType getType(String namespaceURI, String localName);
    XSSimpleType getSimpleType(String namespaceURI, String localName);
    XSAttributeDecl getAttributeDecl(String namespaceURI, String localName);
    XSElementDecl getElementDecl(String namespaceURI, String localName);
    XSModelGroupDecl getModelGroupDecl(String namespaceURI, String localName);
    XSAttGroupDecl getAttGroupDecl(String namespaceURI, String localName);
    XSComplexType getComplexType(String namespaceURI, String localName);
    XSIdentityConstraint getIdentityConstraint(String namespaceURI, String localName);

    /** Iterates all element declarations in all the schemas. */
    Iterator<XSElementDecl> iterateElementDecls();
    /** Iterates all type definitions in all the schemas. */
    Iterator<XSType> iterateTypes();
    /** Iterates all atribute declarations in all the schemas. */
    Iterator<XSAttributeDecl> iterateAttributeDecls();
    /** Iterates all attribute group declarations in all the schemas. */
    Iterator<XSAttGroupDecl> iterateAttGroupDecls();
    /** Iterates all model group declarations in all the schemas. */
    Iterator<XSModelGroupDecl> iterateModelGroupDecls();
    /** Iterates all simple type definitions in all the schemas. */
    Iterator<XSSimpleType> iterateSimpleTypes();
    /** Iterates all complex type definitions in all the schemas. */
    Iterator<XSComplexType> iterateComplexTypes();
    /** Iterates all notation declarations in all the schemas. */
    Iterator<XSNotation> iterateNotations();
    /**
     * Iterates all identity constraints in all the schemas.
     */
    Iterator<XSIdentityConstraint> iterateIdentityConstraints();

    // conceptually static methods
    XSComplexType getAnyType();
    XSSimpleType getAnySimpleType();
    XSContentType getEmpty();

    /**
     * Evaluates a schema component designator against this schema component
     * and returns the resulting schema components.
     *
     * @throws IllegalArgumentException
     *      if SCD is syntactically incorrect.
     * @param scd
     *      Schema component designator. See {@link SCD} for more details.
     * @param nsContext
     *      The namespace context in which SCD is evaluated. Cannot be null.
     * @return
     *      Can be empty but never null.
     */
    Collection<XSComponent> select(String scd, NamespaceContext nsContext);

    /**
     * Evaluates a schema component designator against this schema component
     * and returns the first resulting schema component.
     *
     * @throws IllegalArgumentException
     *      if SCD is syntactically incorrect.
     * @param scd
     *      Schema component designator. See {@link SCD} for more details.
     * @param nsContext
     *      The namespace context in which SCD is evaluated. Cannot be null.
     * @return
     *      null if the SCD didn't match anything. If the SCD matched more than one node,
     *      the first one will be returned.
     */
    XSComponent selectSingle(String scd, NamespaceContext nsContext);
}