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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.index.query;
import org.apache.lucene.search.Query;
import org.apache.lucene.util.BytesRef;
import org.elasticsearch.common.ParseField;
import org.elasticsearch.common.ParsingException;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.bytes.BytesReference;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.common.xcontent.XContentFactory;
import org.elasticsearch.common.xcontent.XContentParser;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.util.Arrays;
/**
* A Query builder which allows building a query given JSON string or binary data provided as input. This is useful when you want
* to use the Java Builder API but still have JSON query strings at hand that you want to combine with other
* query builders.
* <p>
* Example usage in a boolean query :
* <pre>
* <code>
* BoolQueryBuilder bool = new BoolQueryBuilder();
* bool.must(new WrapperQueryBuilder("{\"term\": {\"field\":\"value\"}}");
* bool.must(new TermQueryBuilder("field2","value2");
* </code>
* </pre>
*/
public class WrapperQueryBuilder extends AbstractQueryBuilder<WrapperQueryBuilder> {
public static final String NAME = "wrapper";
private static final ParseField QUERY_FIELD = new ParseField("query");
private final byte[] source;
/**
* Creates a query builder given a query provided as a bytes array
*/
public WrapperQueryBuilder(byte[] source) {
if (source == null || source.length == 0) {
throw new IllegalArgumentException("query source text cannot be null or empty");
}
this.source = source;
}
/**
* Creates a query builder given a query provided as a string
*/
public WrapperQueryBuilder(String source) {
if (Strings.isEmpty(source)) {
throw new IllegalArgumentException("query source string cannot be null or empty");
}
this.source = source.getBytes(StandardCharsets.UTF_8);
}
/**
* Creates a query builder given a query provided as a {@link BytesReference}
*/
public WrapperQueryBuilder(BytesReference source) {
if (source == null || source.length() == 0) {
throw new IllegalArgumentException("query source text cannot be null or empty");
}
this.source = BytesRef.deepCopyOf(source.toBytesRef()).bytes;
}
/**
* Read from a stream.
*/
public WrapperQueryBuilder(StreamInput in) throws IOException {
super(in);
source = in.readByteArray();
}
@Override
protected void doWriteTo(StreamOutput out) throws IOException {
out.writeByteArray(this.source);
}
public byte[] source() {
return this.source;
}
@Override
public String getName() {
return NAME;
}
@Override
protected void doXContent(XContentBuilder builder, Params params) throws IOException {
builder.startObject(NAME);
builder.field(QUERY_FIELD.getPreferredName(), source);
builder.endObject();
}
public static WrapperQueryBuilder fromXContent(XContentParser parser) throws IOException {
XContentParser.Token token = parser.nextToken();
if (token != XContentParser.Token.FIELD_NAME) {
throw new ParsingException(parser.getTokenLocation(), "[wrapper] query malformed");
}
String fieldName = parser.currentName();
if (! QUERY_FIELD.match(fieldName)) {
throw new ParsingException(parser.getTokenLocation(), "[wrapper] query malformed, expected `query` but was " + fieldName);
}
parser.nextToken();
byte[] source = parser.binaryValue();
parser.nextToken();
if (source == null) {
throw new ParsingException(parser.getTokenLocation(), "wrapper query has no [query] specified");
}
return new WrapperQueryBuilder(source);
}
@Override
public String getWriteableName() {
return NAME;
}
@Override
protected Query doToQuery(QueryShardContext context) throws IOException {
throw new UnsupportedOperationException("this query must be rewritten first");
}
@Override
protected int doHashCode() {
return Arrays.hashCode(source);
}
@Override
protected boolean doEquals(WrapperQueryBuilder other) {
return Arrays.equals(source, other.source); // otherwise we compare pointers
}
@Override
protected QueryBuilder doRewrite(QueryRewriteContext context) throws IOException {
try (XContentParser qSourceParser = XContentFactory.xContent(source).createParser(context.getXContentRegistry(), source)) {
final QueryBuilder queryBuilder = parseInnerQueryBuilder(qSourceParser).rewrite(context);
if (boost() != DEFAULT_BOOST || queryName() != null) {
final BoolQueryBuilder boolQueryBuilder = new BoolQueryBuilder();
boolQueryBuilder.must(queryBuilder);
return boolQueryBuilder;
}
return queryBuilder;
}
}
}
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