DataSourceFileResolver.java

/*
 * 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.commons.mail2.javax.resolver;

import java.io.File;
import java.io.IOException;

import javax.activation.DataSource;
import javax.activation.FileDataSource;

/**
 * Creates a {@code DataSource} based on a File. The implementation also resolves file resources.
 *
 * @since 1.3
 */
public class DataSourceFileResolver extends DataSourceBaseResolver {

    /** The base directory of the resource when resolving relative paths */
    private final File baseDir;

    /**
     * Constructs a new instance.
     */
    public DataSourceFileResolver() {
        baseDir = new File(".");
    }

    /**
     * Constructs a new instance.
     *
     * @param baseDir the base directory of the resource when resolving relative paths
     */
    public DataSourceFileResolver(final File baseDir) {
        this.baseDir = baseDir;
    }

    /**
     * Constructs a new instance.
     *
     * @param baseDir the base directory of the resource when resolving relative paths
     * @param lenient shall we ignore resources not found or complain with an exception
     */
    public DataSourceFileResolver(final File baseDir, final boolean lenient) {
        super(lenient);
        this.baseDir = baseDir;
    }

    /**
     * Gets the base directory used for resolving relative resource locations.
     *
     * @return the baseUrl
     */
    public File getBaseDir() {
        return baseDir;
    }

    /** {@inheritDoc} */
    @Override
    public DataSource resolve(final String resourceLocation) throws IOException {
        return resolve(resourceLocation, isLenient());
    }

    /** {@inheritDoc} */
    @Override
    public DataSource resolve(final String resourceLocation, final boolean isLenient) throws IOException {
        File file;
        DataSource result = null;

        if (!isCid(resourceLocation)) {
            file = new File(resourceLocation);

            if (!file.isAbsolute()) {
                file = getBaseDir() != null ? new File(getBaseDir(), resourceLocation) : new File(resourceLocation);
            }

            if (file.exists()) {
                result = new FileDataSource(file);
            } else if (!isLenient) {
                throw new IOException("Cant resolve the following file resource :" + file.getAbsolutePath());
            }
        }

        return result;
    }
}