net.sf.jsefa.flr.FlrIOFactoryImpl Maven / Gradle / Ivy

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JSefa (Java Simple exchange format api) is a simple library for stream-based serialization of java objects to XML, CSV, FLR or any other format and back again using an iterator-style interface independent of the serialization format. The mapping between java object types and types of the serialization format (e. g. xml complex element types) can be defined either by annotating the java classes or programmatically using a simple API. The current implementation supports XML, CSV and FLR - for XML it is based on JSR 173.

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/*
 * Copyright 2007 the original author or authors.
 *
 * 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 net.sf.jsefa.flr;

import java.util.Collection;
import java.util.Map;

import net.sf.jsefa.IOFactoryException;
import net.sf.jsefa.flr.config.FlrConfiguration;
import net.sf.jsefa.flr.lowlevel.FlrLowLevelIOFactory;
import net.sf.jsefa.rbf.RbfIOFactory;
import net.sf.jsefa.rbf.mapping.RbfEntryPoint;

/**
 * Default implementation of {@link FlrIOFactory}.
 * 
 * Instances of this class are immutable and thread-safe.
 * 
 * @author Norman Lahme-Huetig
 */
public final class FlrIOFactoryImpl extends FlrIOFactory {

    private final RbfIOFactory rbfIOFactory;

    private final FlrLowLevelIOFactory lowLevelIOFactory;

    /**
     * Creates a new FlrIOFactory for FlrSerializers and
     * FlrDeserializers using the given configuration.
     * 
     * @param config the configuration object.
     * @return a FlrIOFactory factory
     * @throws IOFactoryException
     */
    public static FlrIOFactory createFactory(FlrConfiguration config) {
        return new FlrIOFactoryImpl(config);
    }

    FlrIOFactoryImpl(FlrConfiguration config) {
        this.rbfIOFactory = createRbfIOFactory(config);
        if (this.rbfIOFactory.withPrefixes()) {
            assertEqualPrefixLength(config.getEntryPoints());
        }
        this.lowLevelIOFactory = FlrLowLevelIOFactory.createFactory(config.getLowLevelConfiguration());
    }

    /**
     * {@inheritDoc}
     */
    public FlrSerializer createSerializer() {
        return this.rbfIOFactory.createSerializer();
    }

    /**
     * {@inheritDoc}
     */
    public FlrDeserializer createDeserializer() {
        return this.rbfIOFactory.createDeserializer();
    }

    private void assertEqualPrefixLength(Collection entryPoints) {
        int length = entryPoints.iterator().next().getDesignator().length();
        for (RbfEntryPoint entryPoint : entryPoints) {
            if (entryPoint.getDesignator().length() != length) {
                throw new IOFactoryException("The prefix " + entryPoint.getDesignator() + " has not the length "
                        + length);
            }
        }
    }

    private RbfIOFactory createRbfIOFactory(
            FlrConfiguration config) {
        return new RbfIOFactory(config) {

            @Override
            protected FlrSerializer createSerializer(FlrConfiguration config,
                    Map, RbfEntryPoint> entryPointsByObjectType) {
                return new FlrSerializerImpl(config, entryPointsByObjectType, lowLevelIOFactory.createSerializer());
            }

            @Override
            protected FlrDeserializer createDeserializer(FlrConfiguration config, RbfEntryPoint entryPoint) {
                return new FlrDeserializerImpl(config, entryPoint, lowLevelIOFactory.createDeserializer());
            }

            @Override
            protected FlrDeserializer createDeserializer(FlrConfiguration config,
                    Map entryPointsByPrefix) {
                return new FlrDeserializerImpl(config, entryPointsByPrefix, lowLevelIOFactory.createDeserializer());
            }

        };
    }
}