com.germinus.easyconf.DatasourceURL.java Source code

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Here is the source code for com.germinus.easyconf.DatasourceURL.java

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/*
 * Copyright 2004-2005 Germinus XXI
 *
 * 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.germinus.easyconf;

import javax.naming.InitialContext;
import javax.naming.NameNotFoundException;
import javax.naming.NamingException;
import javax.sql.DataSource;

import org.apache.commons.configuration.DatabaseConfiguration;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * Represents the URL to a datasource as specified in a properties file
 * @author  Jorge Ferrer
 */
public class DatasourceURL {

    private static final Log log = LogFactory.getLog(DatasourceURL.class);
    private static final String DATASOURCE_PREFIX = Conventions.DATASOURCE_PREFIX;
    public static final String CONFIGURATION_OBJECTS_TABLE = Conventions.CONFIGURATION_OBJECTS_TABLE;
    public static final String PROPERTIES_TABLE = Conventions.PROPERTIES_TABLE;
    private static InitialContext ctx = null;
    private String dataSourceName;
    private String companyId;
    private String componentName;
    private String tableName;

    public DatasourceURL(String datasourcePath, String companyId, String componentName, String tableName) {
        this.dataSourceName = datasourcePath.substring(DATASOURCE_PREFIX.length());
        this.companyId = companyId;
        this.componentName = componentName;
        this.tableName = tableName;
    }

    public DataSource getDatasource() {
        try {
            DataSource ds = null;
            String[] dsFinders = { "java:/comp/env/" + dataSourceName, dataSourceName, };
            for (int i = 0; i < dsFinders.length; i++) {
                try {
                    ds = (DataSource) getContext().lookup(dsFinders[i]);
                    break;
                } catch (NameNotFoundException e) {
                    if (log.isDebugEnabled()) {
                        log.debug("Datasource " + dataSourceName + " not found", e);
                    }
                }
            }
            if (ds == null) {
                throw new ConfigurationException("Cannot find datasource: " + dataSourceName);
            }
            return ds;
        } catch (NamingException e) {
            throw new ConfigurationException("Error loading datasource " + dataSourceName);
        }
    }

    private synchronized InitialContext getContext() throws NamingException {
        if (ctx == null) {
            ctx = new InitialContext();
        }
        return ctx;
    }

    protected String getTableName() {
        return tableName;
    }

    protected String getComponentColumnName() {
        return "component";
    }

    protected String getKeyColumnName() {
        return "key";
    }

    protected String getValueColumnName() {
        return "value";
    }

    public static boolean isDatasource(String fileName) {
        if (fileName == null)
            return false;

        return fileName.startsWith(DATASOURCE_PREFIX);
    }

    public DatabaseConfiguration getConfiguration() {
        return new DatabaseConfiguration(getDatasource(), getTableName(), getComponentColumnName(),
                getKeyColumnName(), getValueColumnName(), getCompanyComponentValue());
    }

    private String getCompanyComponentValue() {
        if (companyId != null) {
            return companyId + ":" + componentName;
        } else {
            return componentName;
        }
    }
}