/**
* 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.hadoop.gateway.svcregfunc.impl;
import org.apache.hadoop.gateway.filter.rewrite.spi.UrlRewriteContext;
import org.apache.hadoop.gateway.filter.rewrite.spi.UrlRewriteFunctionProcessor;
import org.apache.hadoop.gateway.svcregfunc.api.ServicePathFunctionDescriptor;
import org.apache.hadoop.gateway.util.urltemplate.Parser;
import org.apache.hadoop.gateway.util.urltemplate.Path;
import org.apache.hadoop.gateway.util.urltemplate.Template;
import java.util.ArrayList;
import java.util.List;
public class ServicePathFunctionProcessor
extends ServiceRegistryFunctionProcessorBase<ServicePathFunctionDescriptor>
implements UrlRewriteFunctionProcessor<ServicePathFunctionDescriptor> {
@Override
public String name() {
return ServicePathFunctionDescriptor.FUNCTION_NAME;
}
@Override
public List<String> resolve( UrlRewriteContext context, List<String> parameters ) throws Exception {
List<String> results = null;
if( parameters != null ) {
results = new ArrayList<String>( parameters.size() );
for( String parameter : parameters ) {
String url = lookupServiceUrl( parameter );
if( url != null ) {
Template template = Parser.parse( url );
List<Path> path = template.getPath();
if( path != null ) {
parameter = toString( path );
}
}
results.add( parameter );
}
}
return results;
}
private String toString( List<Path> paths ) {
StringBuilder s = new StringBuilder();
for( Path path: paths ) {
s.append( '/' );
s.append( path.getFirstValue().getPattern() );
}
if( s.length() == 0 ) {
s.append( '/' );
}
return s.toString();
}
}