querqy.elasticsearch.query.Rewriter Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of querqy-elasticsearch Show documentation
Querqy library for query rewriting: Querqy for Elasticsearch
There is a newer version: 1.7.es8150.0
package querqy.elasticsearch.query;

import org.elasticsearch.common.io.stream.NamedWriteable;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.xcontent.ContextParser;
import org.elasticsearch.xcontent.ToXContent;
import org.elasticsearch.xcontent.XContentBuilder;
import org.elasticsearch.xcontent.XContentParser;

import java.io.IOException;
import java.util.Map;
import java.util.Objects;

public class Rewriter implements NamedWriteable, ToXContent {

    public static final String NAME = "rewriter";

    public static ContextParser PARSER = new RewriterParser();

    private String name = null;
    private Map params = null;

    public Rewriter(final StreamInput in) throws IOException {
        name = in.readString();
        final boolean hasParams = in.readBoolean();
        if (hasParams) {
            params = in.readMap();
        }
    }

    public Rewriter(final String name) {
        this(name, null);
    }

    public Rewriter(final String name, final Map params) {
        if (name == null) {
            throw new IllegalArgumentException("Missing rewriter name");
        }
        this.name = name;
        this.params = params;
    }

    @Override
    public String getWriteableName() {
        return NAME;
    }

    @Override
    public void writeTo(final StreamOutput out) throws IOException {
        out.writeString(name);
        if (params != null) {
            out.writeBoolean(true);
            out.writeMap(params);
        } else {
            out.writeBoolean(false);
        }
    }

    @Override
    public XContentBuilder toXContent(final XContentBuilder builder, final Params params) throws IOException {
        if (this.params != null) {
            builder.startObject();
            builder.field("name", name);
            if (this.params != null && !this.params.isEmpty()) {
                builder.field("params", this.params);
            }
            builder.endObject();
        } else {
            builder.value(name);
        }
        return builder;
    }

    @Override
    public boolean isFragment() {
        return params == null;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (!(o instanceof Rewriter)) return false;
        Rewriter rewriter = (Rewriter) o;
        return Objects.equals(name, rewriter.name) &&
                Objects.equals(params, rewriter.params);
    }

    @Override
    public int hashCode() {

        return Objects.hash(name, params);
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Map getParams() {
        return params;
    }

    public void setParams(Map params) {
        this.params = params;
    }

    public static class RewriterParser implements ContextParser {

        @Override
        public Rewriter parse(final XContentParser parser, final Void context) throws IOException {
            final XContentParser.Token token = parser.currentToken();
            if (token == XContentParser.Token.START_OBJECT) {

                final Map definition = parser.map();
                return new Rewriter((String) definition.get("name"), (Map) definition.get("params"));

            } else if (token == XContentParser.Token.VALUE_STRING) {
                return new Rewriter(parser.text(), null);
            } else {
                throw new IOException("Unexpected token type: " + token);
            }

        }
    }
}