Using json content format with solrJ

MappingJacksonResponseParser

/*
 * Copyright 2014 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 com.example.solr;

import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import java.nio.charset.Charset;

import javax.activation.MimeType;
import javax.activation.MimeTypeParseException;

import org.apache.solr.client.solrj.ResponseParser;
import org.apache.solr.common.util.NamedList;
import org.springframework.dao.InvalidDataAccessResourceUsageException;
import org.springframework.util.StreamUtils;

/**
 * @author Christoph Strobl
 */
public class MappingJacksonResponseParser extends ResponseParser {

	private static final String WRITER = "json";

	private final MimeType responseType;

	public MappingJacksonResponseParser() {
		this(defaultMimeType());
	}

	public MappingJacksonResponseParser(MimeType responseType) {
		this.responseType = responseType != null ? responseType : defaultMimeType();
	}

	@Override
	public String getWriterType() {
		return WRITER;
	}

	@Override
	public String getContentType() {
		return responseType.toString();
	}

	@Override
	public String getVersion() {
		return super.getVersion();
	}

	@Override
	public NamedList<Object> processResponse(InputStream body, String encoding) {

		NamedList<Object> result = new NamedList<Object>();
		try {
			result.add("json", StreamUtils.copyToString(body, Charset.forName(encoding)));
		} catch (IOException e) {
			throw new InvalidDataAccessResourceUsageException("Unable to read json from stream.", e);
		}
		return result;
	}

	@Override
	public NamedList<Object> processResponse(Reader reader) {
		throw new UnsupportedOperationException();
	}

	private static MimeType defaultMimeType() {
		try {
		  //solr uses text/pain as content type (see: SOLR-5272)
			return new MimeType("text", "plain");
		} catch (MimeTypeParseException o_O) {
			throw new IllegalArgumentException(o_O);
		}
	}

}

SolrJsonRequest

/*
 * Copyright 2014 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  com.example.solr;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.TimeUnit;

import org.apache.solr.client.solrj.SolrRequest;
import org.apache.solr.client.solrj.SolrServer;
import org.apache.solr.client.solrj.SolrServerException;
import org.apache.solr.common.params.ModifiableSolrParams;
import org.apache.solr.common.params.SolrParams;
import org.apache.solr.common.util.ContentStream;
import org.apache.solr.common.util.ContentStreamBase.StringStream;

import com.fasterxml.jackson.databind.JsonNode;

/**
 * @author Christoph Strobl
 */
public class SolrJsonRequest extends SolrRequest {

	private static final long serialVersionUID = 5786008418321490550L;

	private ModifiableSolrParams params = new ModifiableSolrParams();
	private List<StringStream> contentStream = null;

	public SolrJsonRequest(METHOD method, String path) {
		super(method, path);
	}

	@Override
	public SolrParams getParams() {
		return this.params;
	}

	@Override
	public Collection<ContentStream> getContentStreams() throws IOException {
		return contentStream != null ? Collections.<ContentStream> unmodifiableCollection(contentStream) : null;
	}

	@Override
	public SolrJsonResponse process(SolrServer server) throws SolrServerException, IOException {

		long startTime = TimeUnit.MILLISECONDS.convert(System.nanoTime(), TimeUnit.NANOSECONDS);
		SolrJsonResponse res = new SolrJsonResponse();
		this.setResponseParser(new MappingJacksonResponseParser());
		res.setResponse(server.request(this));
		long endTime = TimeUnit.MILLISECONDS.convert(System.nanoTime(), TimeUnit.NANOSECONDS);
		res.setElapsedTime(endTime - startTime);
		return res;
	}

	public void addContentToStream(JsonNode content) {

		if (contentStream == null) {
			this.contentStream = new ArrayList<StringStream>();
		}
		contentStream.add(new StringStream(content.toString()));
	}

}

SolrJsonResponse

/*
 * Copyright 2014 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  com.example.solr;

import org.apache.solr.client.solrj.response.SolrResponseBase;
import org.apache.solr.common.util.NamedList;
import org.springframework.dao.InvalidDataAccessResourceUsageException;

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;

/**
 * @author Christoph Strobl
 */
public class SolrJsonResponse extends SolrResponseBase {

	private static final long serialVersionUID = 5727953031460362404L;
	private JsonNode root;

	@Override
	public void setResponse(NamedList<Object> response) {

		super.setResponse(response);
		try {
			root = new ObjectMapper().readTree((String) getResponse().get("json"));
		} catch (Exception e) {
			throw new InvalidDataAccessResourceUsageException("Unable to parse json from response.", e);
		}
	}

	public String getJsonResponse() {
		return (String) getResponse().get("json");
	}

	public JsonNode getNode(String name) {
		return root.findValue(name);
	}

}