org.apache.hadoop.gateway.descriptor.xml.XmlGatewayDescriptorRules.java Source code

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Here is the source code for org.apache.hadoop.gateway.descriptor.xml.XmlGatewayDescriptorRules.java

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/**
 * 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.descriptor.xml;

import org.apache.commons.beanutils.MethodUtils;
import org.apache.commons.digester3.Digester;
import org.apache.commons.digester3.FactoryCreateRule;
import org.apache.commons.digester3.Rule;
import org.apache.commons.digester3.binder.AbstractRulesModule;
import org.xml.sax.Attributes;

public class XmlGatewayDescriptorRules extends AbstractRulesModule implements XmlGatewayDescriptorTags {

    private static final Object[] NO_PARAMS = new Object[0];

    @Override
    protected void configure() {

        forPattern(GATEWAY).addRule(new FactoryCreateRule(XmlGatewayDescriptorFactory.class));
        forPattern(GATEWAY + "/" + RESOURCE).addRule(new AddNextRule("addResource"));
        forPattern(GATEWAY + "/" + RESOURCE + "/" + RESOURCE_ROLE).callMethod("role").usingElementBodyAsArgument();
        forPattern(GATEWAY + "/" + RESOURCE + "/" + RESOURCE_PATTERN).callMethod("pattern")
                .usingElementBodyAsArgument();
        forPattern(GATEWAY + "/" + RESOURCE + "/" + FILTER).addRule(new AddNextRule("addFilter"));
        forPattern(GATEWAY + "/" + RESOURCE + "/" + FILTER + "/" + FILTER_ROLE).callMethod("name")
                .usingElementBodyAsArgument();
        forPattern(GATEWAY + "/" + RESOURCE + "/" + FILTER + "/" + FILTER_ROLE).callMethod("role")
                .usingElementBodyAsArgument();
        forPattern(GATEWAY + "/" + RESOURCE + "/" + FILTER + "/" + FILTER_IMPL).callMethod("impl")
                .usingElementBodyAsArgument();
        forPattern(GATEWAY + "/" + RESOURCE + "/" + FILTER + "/" + FILTER_PARAM).addRule(new AddNextRule("param"));
        forPattern(GATEWAY + "/" + RESOURCE + "/" + FILTER + "/" + FILTER_PARAM + "/" + FILTER_PARAM_NAME)
                .callMethod("name").usingElementBodyAsArgument();
        forPattern(GATEWAY + "/" + RESOURCE + "/" + FILTER + "/" + FILTER_PARAM + "/" + FILTER_PARAM_VALUE)
                .callMethod("value").usingElementBodyAsArgument();
    }

    private class AddNextRule extends Rule {

        private String method;

        private AddNextRule(String method) {
            this.method = method;
        }

        @Override
        public void begin(String namespace, String name, Attributes attributes) throws Exception {
            Digester digester = getDigester();
            digester.push(MethodUtils.invokeMethod(digester.peek(), method, NO_PARAMS));
        }

        @Override
        public void end(String namespace, String name) {
            getDigester().pop();
        }

    }

}