co.cask.cdap.gateway.handlers.ConfigService.java Source code

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Here is the source code for co.cask.cdap.gateway.handlers.ConfigService.java

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/*
 * Copyright  2015 Cask Data, Inc.
 *
 * 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 co.cask.cdap.gateway.handlers;

import co.cask.cdap.common.conf.CConfiguration;
import co.cask.cdap.proto.ConfigEntry;
import com.google.common.collect.Lists;
import com.google.inject.Inject;
import org.apache.hadoop.conf.Configuration;

import java.io.IOException;
import java.io.StringWriter;
import java.util.List;
import java.util.Map;

/**
 * Exposes {@link CConfiguration} and {@link Configuration}.
 */
public class ConfigService {

    private final CConfiguration cConf;
    private final Configuration hConf;

    @Inject
    public ConfigService(CConfiguration cConf, Configuration hConf) {
        this.cConf = cConf;
        this.hConf = hConf;
    }

    public List<ConfigEntry> getCConf() {
        return toConfigEntries(cConf);
    }

    public String getCConfXMLString() throws IOException {
        StringWriter stringWriter = new StringWriter();
        cConf.writeXml(stringWriter);
        return stringWriter.toString();
    }

    public List<ConfigEntry> getHConf() {
        return toConfigEntries(hConf);
    }

    public String getHConfXMLString() throws IOException {
        StringWriter stringWriter = new StringWriter();
        hConf.writeXml(stringWriter);
        return stringWriter.toString();
    }

    private String getFirstElement(String[] array) {
        if (array != null && array.length >= 1) {
            return array[0];
        } else {
            return null;
        }
    }

    private List<ConfigEntry> toConfigEntries(Configuration configuration) {
        List<ConfigEntry> result = Lists.newArrayList();
        for (Map.Entry<String, String> entry : configuration) {
            String source = getFirstElement(configuration.getPropertySources(entry.getKey()));
            result.add(new ConfigEntry(entry.getKey(), entry.getValue(), source));
        }
        return result;
    }

    private List<ConfigEntry> toConfigEntries(CConfiguration configuration) {
        List<ConfigEntry> result = Lists.newArrayList();
        for (Map.Entry<String, String> entry : configuration) {
            String source = getFirstElement(configuration.getPropertySources(entry.getKey()));
            result.add(new ConfigEntry(entry.getKey(), entry.getValue(), source));
        }
        return result;
    }
}