/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.jackrabbit.spi.commons.query.qom;
import org.apache.jackrabbit.spi.commons.conversion.NamePathResolver;
import org.apache.jackrabbit.spi.Name;
import org.apache.jackrabbit.spi.Path;
import javax.jcr.NamespaceException;
/**
* <code>AbstractQOMNode</code>...
*/
public abstract class AbstractQOMNode {
protected final NamePathResolver resolver;
public AbstractQOMNode(NamePathResolver resolver) {
this.resolver = resolver;
}
/**
* Accepts a <code>visitor</code> and calls the appropriate visit method
* depending on the type of this QOM node.
*
* @param visitor the visitor.
* @param data user defined data, which is passed to the visit method.
*/
public abstract Object accept(QOMTreeVisitor visitor, Object data) throws Exception;
//---------------------------< internal >-----------------------------------
/**
* Returns the JCR name string for the given <code>Name</code> or
* <code>null</code> if <code>name</code> is <code>null</code>.
*
* @param name the <code>Name</code>.
* @return the prefixed JCR name or <code>name.toString()</code> if an
* unknown namespace URI is encountered.
*/
protected String getJCRName(Name name) {
if (name == null) {
return null;
}
try {
return resolver.getJCRName(name);
} catch (NamespaceException e) {
return name.toString();
}
}
/**
* Returns the JCR path String for the given <code>Path</code> object or
* <code>null</code> if <code>path</code> is <code>null</code>.
*
* @param path A <code>Path</code> object.
* @return JCR path in the standard form or <code>path.toString()</code>
* if an unknown namespace URI is encountered.
*/
protected String getJCRPath(Path path) {
if (path == null) {
return null;
}
try {
return resolver.getJCRPath(path);
} catch (NamespaceException e) {
return path.toString();
}
}
protected String quote(Name name) {
String str = getJCRName(name);
if (str.indexOf(':') != -1) {
return "[" + str + "]";
} else {
return str;
}
}
protected String quote(Path path) {
String str = getJCRPath(path);
if (str.indexOf(':') != -1 || str.indexOf('/') != -1) {
return "[" + str + "]";
} else {
return str;
}
}
protected String protect(Object expression) {
String str = expression.toString();
if (str.indexOf(" ") != -1) {
return "(" + str + ")";
} else {
return str;
}
}
}