com.sap.research.connectivity.gw.converters.GwRemoteEntityConverter.java Source code

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Here is the source code for com.sap.research.connectivity.gw.converters.GwRemoteEntityConverter.java

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/*
 * Copyright 2012 SAP AG
 *
 * 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.sap.research.connectivity.gw.converters;

import java.io.InputStream;
import java.util.List;
import java.util.logging.Logger;

import org.apache.commons.lang3.StringUtils;
import org.apache.felix.scr.annotations.Component;
import org.apache.felix.scr.annotations.Service;
import org.springframework.roo.shell.Completion;
import org.springframework.roo.shell.Converter;
import org.springframework.roo.shell.MethodTarget;
import org.springframework.roo.support.util.XmlUtils;
import org.w3c.dom.Attr;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

import com.sap.research.connectivity.gw.GWOperationsUtils;
import com.sap.research.connectivity.gw.GwRemoteEntity;

@Component
@Service

public class GwRemoteEntityConverter extends GWOperationsUtils implements Converter<GwRemoteEntity> {

    private Logger log = Logger.getLogger(getClass().getName());

    public GwRemoteEntity convertFromText(final String value, final Class<?> requiredType,
            final String optionContext) {
        if (StringUtils.isBlank(value)) {
            return null;
        }
        return new GwRemoteEntity(value);
    }

    public boolean getAllPossibleValues(final List<Completion> completions, final Class<?> requiredType,
            final String existingData, final String optionContext, final MethodTarget target) {

        //      Parse, and obtain the namespace value
        String namespaceValue = " ";

        if (target.getRemainingBuffer().contains("--namespace")) {
            String[] splitCommand = target.getRemainingBuffer().split(" ");

            for (int i = 0; i < splitCommand.length; i++) {
                if (splitCommand[i].equals("--namespace")) {
                    namespaceValue = splitCommand[i + 1];
                    break;
                }

            }
        } else {
            log.severe(
                    "Please specify a namespace before choosing the remote entity set (use the option \"--namespace\").");
            return true;
        }

        //      Obtain the available entity sets from the gateway name space
        String metaDataPath = getSubPackagePath(oDataFolder);
        String metaDataFile = metaDataPath + SEPARATOR + namespaceValue + "_metadata.xml";

        Document doc;

        try {
            InputStream metaDataIs = fileManager.getInputStream(metaDataFile);
            doc = XmlUtils.getDocumentBuilder().parse(metaDataIs);
        } catch (Exception ex) {
            //throw new IllegalStateException(ex);
            log.severe("Namespace \"" + namespaceValue
                    + "\" does not exist or is corrupted. Please specify a valid namespace.");
            return true;
        }

        NodeList nodeList = doc.getElementsByTagName("entity");

        for (int i = 0; i < nodeList.getLength(); i++) {

            Node node = nodeList.item(i);
            Attr attr = (Attr) node.getAttributes().getNamedItem("name");

            completions.add(new Completion(attr.getValue().toString()));

        }

        return false;

    }

    public boolean supports(final Class<?> requiredType, final String optionContext) {
        return GwRemoteEntity.class.isAssignableFrom(requiredType);
    }

}