    001/*
    002 * Licensed to the Apache Software Foundation (ASF) under one or more
    003 * contributor license agreements.  See the NOTICE file distributed with
    004 * this work for additional information regarding copyright ownership.
    005 * The ASF licenses this file to You under the Apache License, Version 2.0
    006 * (the "License"); you may not use this file except in compliance with
    007 * the License.  You may obtain a copy of the License at
    008 *
    009 *     http://www.apache.org/licenses/LICENSE-2.0
    010 *
    011 * Unless required by applicable law or agreed to in writing, software
    012 * distributed under the License is distributed on an "AS IS" BASIS,
    013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    014 * See the License for the specific language governing permissions and
    015 * limitations under the License.
    016 */
    017
    018package org.apache.commons.configuration2;
    019
    020import com.fasterxml.jackson.databind.ObjectMapper;
    021import com.fasterxml.jackson.databind.type.MapType;
    022import org.apache.commons.configuration2.ex.ConfigurationException;
    023import org.apache.commons.configuration2.io.InputStreamSupport;
    024import org.apache.commons.configuration2.tree.ImmutableNode;
    025
    026import java.io.IOException;
    027import java.io.InputStream;
    028import java.io.Reader;
    029import java.io.Writer;
    030import java.util.Map;
    031
    032/**
    033 * <p>
    034 * A specialized hierarchical configuration class that is able to parse JSON
    035 * documents.
    036 * </p>
    037 *
    038 * @since 2.2
    039 */
    040public class JSONConfiguration extends AbstractYAMLBasedConfiguration
    041        implements FileBasedConfiguration, InputStreamSupport
    042{
    043
    044    /**
    045     * The object mapper used by the {@code JSONConfiguration}.
    046     */
    047    private final ObjectMapper mapper = new ObjectMapper();
    048
    049    /**
    050     * The {@code MapType} used to convert types.
    051     */
    052    private final MapType type = mapper.getTypeFactory()
    053            .constructMapType(Map.class, String.class, Object.class);
    054
    055    /**
    056     * Creates a new instance of {@code JSONConfiguration}.
    057     */
    058    public JSONConfiguration()
    059    {
    060        super();
    061    }
    062
    063    /**
    064     * Creates a new instance of {@code JSONConfiguration} as a copy of the
    065     * specified configuration.
    066     *
    067     * @param c the configuration to be copied
    068     */
    069    public JSONConfiguration(final HierarchicalConfiguration<ImmutableNode> c)
    070    {
    071        super(c);
    072    }
    073
    074    @Override
    075    public void read(final Reader in) throws ConfigurationException
    076    {
    077        try
    078        {
    079            final Map<String, Object> map = mapper.readValue(in, this.type);
    080            load(map);
    081        }
    082        catch (final Exception e)
    083        {
    084            rethrowException(e);
    085        }
    086    }
    087
    088    @Override
    089    public void write(final Writer out) throws ConfigurationException, IOException
    090    {
    091        this.mapper.writer().writeValue(out, constructMap(
    092                this.getNodeModel().getNodeHandler().getRootNode()));
    093    }
    094
    095    /**
    096     * Loads the configuration from the given input stream.
    097     *
    098     * @param in the input stream
    099     * @throws ConfigurationException if an error occurs
    100     */
    101    @Override
    102    public void read(final InputStream in) throws ConfigurationException
    103    {
    104        try
    105        {
    106            final Map<String, Object> map = mapper.readValue(in, this.type);
    107            load(map);
    108        }
    109        catch (final Exception e)
    110        {
    111            rethrowException(e);
    112        }
    113    }
    114
    115}