/*
* Copyright (C) 2008 Google Inc.
*
* 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 com.google.gxp.compiler.parser;
import com.google.common.collect.Maps;
import com.google.gxp.compiler.alerts.AlertSink;
import com.google.gxp.compiler.alerts.SourcePosition;
import com.google.gxp.compiler.schema.Schema;
import com.google.gxp.compiler.schema.SchemaFactory;
import java.util.*;
/**
* A mapping from XML namespace URIs to {@link Namespace} objects.
*/
final class NamespaceSet {
private Map<String, Namespace> exactMappings = Maps.newHashMap();
private final SchemaFactory schemaFactory;
public NamespaceSet(SchemaFactory schemaFactory) {
for (Namespace ns : new Namespace[] {
GxpNamespace.INSTANCE,
UnqualifiedCallNamespace.INSTANCE,
ExprNamespace.INSTANCE,
CppNamespace.INSTANCE,
JavaNamespace.INSTANCE,
JavaScriptNamespace.INSTANCE,
ScalaNamespace.INSTANCE,
MsgNamespace.INSTANCE,
NoMsgNamespace.INSTANCE,
}) {
exactMappings.put(ns.getUri(), ns);
}
this.schemaFactory = schemaFactory;
}
/**
* Returns the {@code Namespace} for the given namespace URI, {@code nsUri}.
* If no matching {@code Namespace} can be found then {@code null} is
* returned and {@link com.google.gxp.compiler.alerts.Alert}s will be
* reported to the specified {@link AlertSink}.
*
* @param alertSink {@code AlertSink} for reporting
* {@code com.google.gxp.compiler.alerts.Alert}s to.
* @param sourcePosition {@link SourcePosition} to use for reported
* {@code com.google.gxp.compiler.alerts.Alert}s.
* @param nsUri namespace URI to look up.
*/
public Namespace get(AlertSink alertSink,
SourcePosition sourcePosition,
String nsUri) {
if (nsUri == null || nsUri.equals("")) {
alertSink.add(new NoNamespaceError(sourcePosition));
return null;
}
Namespace result = exactMappings.get(nsUri);
// check for a qualified call namespace
if (result == null && nsUri.startsWith(QualifiedCallNamespace.NEW_CALL_PREFIX)) {
result = new QualifiedCallNamespace(nsUri);
exactMappings.put(result.getUri(), result);
}
// check for a schema namespace
if (result == null) {
Schema schema = schemaFactory.fromNamespaceUri(nsUri);
if (schema != null) {
result = new OutputNamespace(schema);
exactMappings.put(result.getUri(), result);
}
}
if (result == null) {
alertSink.add(new UnknownNamespaceError(sourcePosition, nsUri));
}
return result;
}
}