org.commonjava.couch.io.CouchAppReader.java Source code

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Here is the source code for org.commonjava.couch.io.CouchAppReader.java

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/*******************************************************************************
 * Copyright 2011 John Casey
 * 
 * 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 org.commonjava.couch.io;

import static org.apache.commons.io.IOUtils.closeQuietly;
import static org.apache.commons.io.IOUtils.copy;
import static org.apache.commons.io.IOUtils.readLines;

import java.io.IOException;
import java.io.InputStream;
import java.io.StringWriter;
import java.util.List;
import java.util.Set;

import javax.inject.Singleton;

import org.commonjava.couch.db.CouchDBException;
import org.commonjava.couch.db.model.AppDescription;
import org.commonjava.couch.model.CouchApp;
import org.commonjava.couch.model.CouchAppView;

@Singleton
public class CouchAppReader {
    private static final String APP_BASEPATH = "couchapps/";

    private static final String VIEW_SUBPATH = "/views/";

    private static final String MAP_JS = "/map.js";

    private static final String REDUCE_JS = "/reduce.js";

    public CouchApp readAppDefinition(final AppDescription description) throws IOException, CouchDBException {
        ClassLoader cloader = Thread.currentThread().getContextClassLoader();
        String appName = description.getAppName();

        CouchApp app = new CouchApp(appName, description);

        String appBase = APP_BASEPATH + description.getClasspathAppResource();

        String viewBase = appBase + VIEW_SUBPATH;

        Set<String> listing = description.getViewNames();
        if (listing != null) {
            for (String view : listing) {
                String mapPath = viewBase + view + MAP_JS;
                String reducePath = viewBase + view + REDUCE_JS;

                String map = null;

                InputStream in = cloader.getResourceAsStream(mapPath);
                if (in == null) {
                    throw new CouchDBException(
                            "Cannot read view: %s in CouchDB application: %s (classpath resource: %s)", view,
                            appName, mapPath);
                }

                StringWriter sWriter = new StringWriter();
                try {
                    List<String> lines = readLines(in);
                    for (String line : lines) {
                        String test = line.trim();
                        if (test.startsWith("#") || test.startsWith("/*") || test.startsWith("*")
                                || test.startsWith("//")) {
                            continue;
                        }
                        sWriter.write(line);
                        sWriter.write('\n');
                    }
                } finally {
                    closeQuietly(in);
                }
                map = sWriter.toString();

                String reduce = null;

                in = cloader.getResourceAsStream(reducePath);
                sWriter = new StringWriter();
                if (in != null) {
                    try {
                        copy(in, sWriter);
                    } finally {
                        closeQuietly(in);
                    }
                    reduce = sWriter.toString();
                }

                app.addView(view, new CouchAppView(map, reduce));
            }
        }

        return app;
    }

}