org.apache.xmlbeans.SchemaComponent Maven / Gradle / Ivy
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/* Copyright 2004 The Apache Software Foundation
*
* Licensed 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.xmlbeans;
import javax.xml.namespace.QName;
/**
* Represents a global Schema Component. That is, a type, element, attribute,
* model group, attribute group, or identity constraint.
*
* Note that not all types, elements, and attributes are global; local
* types, element, and attributes do not appear in the global lookup table.
* Also note that other information items such as particles, facets, and
* so on are not globally indexed, so are not SchemaComponents.
*
* @see SchemaType
* @see SchemaGlobalElement
* @see SchemaGlobalAttribute
* @see SchemaAttributeGroup
* @see SchemaModelGroup
* @see SchemaIdentityConstraint
*/
public interface SchemaComponent
{
/** A type definition. See {@link #getComponentType} */
static final int TYPE = 0;
/** An element definition. See {@link #getComponentType} */
static final int ELEMENT = 1;
/** An attribute definition. See {@link #getComponentType} */
static final int ATTRIBUTE = 3;
/** An attribute group definition. See {@link #getComponentType} */
static final int ATTRIBUTE_GROUP = 4;
/** An identity constraint definition. See {@link #getComponentType} */
static final int IDENTITY_CONSTRAINT = 5;
/** A model group definition. See {@link #getComponentType} */
static final int MODEL_GROUP = 6;
/** A notation definition. See {@link #getComponentType} */
static final int NOTATION = 7;
/** An annotation. See {@link #getComponentType} */
static final int ANNOTATION = 8;
/**
* Returns the type code for the schema object, either {@link #TYPE},
* {@link #ELEMENT}, {@link #ATTRIBUTE}, {@link #ATTRIBUTE_GROUP},
* {@link #MODEL_GROUP}, {@link #IDENTITY_CONSTRAINT}, or {@link #NOTATION}.
*/
int getComponentType();
/**
* Returns the typesystem within which this component definition resides
*/
SchemaTypeSystem getTypeSystem();
/**
* The name of the schema component
*/
QName getName();
/**
* The name of resource that represends the source .xsd in which this component was defined (if known)
*
See: {@link org.apache.xmlbeans.SchemaTypeLoader#getSourceAsStream(String)}
*
Example:
* SchemaType schemaType = ..;
* InputStream is = schemaType.getTypeSystem().getSourceAsStream(schemaType.getSourceName());
*
*/
String getSourceName();
/**
* A lazy reference to a component. Used by SchemaTypeLoaders to
* avoid loading components until they are actually needed.
*/
public static abstract class Ref
{
protected Ref(SchemaComponent schemaComponent)
{ _schemaComponent = schemaComponent; }
protected Ref(SchemaTypeSystem schemaTypeSystem, String handle)
{ assert(handle != null); _schemaTypeSystem = schemaTypeSystem; _handle = handle; }
private volatile SchemaComponent _schemaComponent;
private SchemaTypeSystem _schemaTypeSystem;
public String _handle;
public abstract int getComponentType();
public final SchemaTypeSystem getTypeSystem()
{ return _schemaTypeSystem; }
public final SchemaComponent getComponent()
{
if (_schemaComponent == null && _handle != null)
{
synchronized (this)
{
if (_schemaComponent == null && _handle != null)
{
_schemaComponent = _schemaTypeSystem.resolveHandle(_handle);
_schemaTypeSystem = null;
}
}
}
return _schemaComponent;
}
}
/**
* Used for on-demand loading of schema components.
*/
public Ref getComponentRef();
}