DataSourceCompositeResolver.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.IOException;

import javax.activation.DataSource;

import org.apache.commons.mail2.javax.DataSourceResolver;

/**
 * A composite data source resolver. It allows to resolve data sources coming from multiple locations such as the classpath, the file system or an URL.
 *
 * @since 1.3
 */
public class DataSourceCompositeResolver extends DataSourceBaseResolver {

    /** The list of resolvers */
    private final DataSourceResolver[] dataSourceResolvers;

    /**
     * Constructs a new instance.
     *
     * @param dataSourceResolvers a list of resolvers being used
     */
    public DataSourceCompositeResolver(final DataSourceResolver[] dataSourceResolvers) {
        this.dataSourceResolvers = dataSourceResolvers.clone();
    }

    /**
     * Constructs a new instance.
     *
     * @param dataSourceResolvers a list of resolvers being used
     * @param isLenient           shall we ignore resources not found or throw an exception?
     */
    public DataSourceCompositeResolver(final DataSourceResolver[] dataSourceResolvers, final boolean isLenient) {
        super(isLenient);
        this.dataSourceResolvers = dataSourceResolvers.clone();
    }

    /**
     * Gets the underlying data source resolvers.
     *
     * @return underlying data source resolvers
     */
    public DataSourceResolver[] getDataSourceResolvers() {
        // clone the internal array to prevent external modification (see EMAIL-116)
        return dataSourceResolvers.clone();
    }

    /** {@inheritDoc} */
    @Override
    public DataSource resolve(final String resourceLocation) throws IOException {
        final DataSource result = resolve(resourceLocation, true);
        if (isLenient() || result != null) {
            return result;
        }
        throw new IOException("The following resource was not found : " + resourceLocation);

    }

    /** {@inheritDoc} */
    @Override
    public DataSource resolve(final String resourceLocation, final boolean isLenient) throws IOException {
        for (final DataSourceResolver dataSourceResolver : dataSourceResolvers) {
            final DataSource dataSource = dataSourceResolver.resolve(resourceLocation, isLenient);
            if (dataSource != null) {
                return dataSource;
            }
        }
        if (isLenient) {
            return null;
        }
        throw new IOException("The following resource was not found : " + resourceLocation);
    }
}