    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 documents.
    035 * </p>
    036 *
    037 * @since 2.2
    038 */
    039public class JSONConfiguration extends AbstractYAMLBasedConfiguration implements FileBasedConfiguration, InputStreamSupport {
    040
    041    /**
    042     * The object mapper used by the {@code JSONConfiguration}.
    043     */
    044    private final ObjectMapper mapper = new ObjectMapper();
    045
    046    /**
    047     * The {@code MapType} used to convert types.
    048     */
    049    private final MapType type = mapper.getTypeFactory().constructMapType(Map.class, String.class, Object.class);
    050
    051    /**
    052     * Creates a new instance of {@code JSONConfiguration}.
    053     */
    054    public JSONConfiguration() {
    055    }
    056
    057    /**
    058     * Creates a new instance of {@code JSONConfiguration} as a copy of the specified configuration.
    059     *
    060     * @param c the configuration to be copied
    061     */
    062    public JSONConfiguration(final HierarchicalConfiguration<ImmutableNode> c) {
    063        super(c);
    064    }
    065
    066    @Override
    067    public void read(final Reader in) throws ConfigurationException {
    068        try {
    069            load(mapper.readValue(in, this.type));
    070        } catch (final Exception e) {
    071            rethrowException(e);
    072        }
    073    }
    074
    075    @Override
    076    public void write(final Writer out) throws ConfigurationException, IOException {
    077        this.mapper.writer().writeValue(out, constructMap(this.getNodeModel().getNodeHandler().getRootNode()));
    078    }
    079
    080    /**
    081     * Loads the configuration from the given input stream.
    082     *
    083     * @param in the input stream
    084     * @throws ConfigurationException if an error occurs
    085     */
    086    @Override
    087    public void read(final InputStream in) throws ConfigurationException {
    088        try {
    089            load(mapper.readValue(in, this.type));
    090        } catch (final Exception e) {
    091            rethrowException(e);
    092        }
    093    }
    094
    095}