org.elasticsearch.search.lookup.LeafDocLookup Maven / Gradle / Ivy

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/*
 * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
 * or more contributor license agreements. Licensed under the Elastic License
 * 2.0 and the Server Side Public License, v 1; you may not use this file except
 * in compliance with, at your election, the Elastic License 2.0 or the Server
 * Side Public License, v 1.
 */
package org.elasticsearch.search.lookup;

import org.apache.lucene.index.LeafReaderContext;
import org.elasticsearch.ExceptionsHelper;
import org.elasticsearch.index.fielddata.IndexFieldData;
import org.elasticsearch.index.fielddata.ScriptDocValues;
import org.elasticsearch.index.mapper.MappedFieldType;

import java.io.IOException;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.util.function.Function;

public class LeafDocLookup implements Map> {

    private final Map> localCacheFieldData = new HashMap<>(4);
    private final Function fieldTypeLookup;
    private final Function> fieldDataLookup;

    private final LeafReaderContext reader;

    private int docId = -1;

    LeafDocLookup(Function fieldTypeLookup, Function> fieldDataLookup,
                  LeafReaderContext reader) {
        this.fieldTypeLookup = fieldTypeLookup;
        this.fieldDataLookup = fieldDataLookup;
        this.reader = reader;
    }

    public void setDocument(int docId) {
        this.docId = docId;
    }

    @Override
    public ScriptDocValues get(Object key) {
        // assume its a string...
        String fieldName = key.toString();
        ScriptDocValues scriptValues = localCacheFieldData.get(fieldName);
        if (scriptValues == null) {
            final MappedFieldType fieldType = fieldTypeLookup.apply(fieldName);
            if (fieldType == null) {
                throw new IllegalArgumentException("No field found for [" + fieldName + "] in mapping");
            }
            // load fielddata on behalf of the script: otherwise it would need additional permissions
            // to deal with pagedbytes/ramusagestimator/etc
            scriptValues = AccessController.doPrivileged(new PrivilegedAction>() {
                @Override
                public ScriptDocValues run() {
                    return fieldDataLookup.apply(fieldType).load(reader).getScriptValues();
                }
            });
            localCacheFieldData.put(fieldName, scriptValues);
        }
        try {
            scriptValues.setNextDocId(docId);
        } catch (IOException e) {
            throw ExceptionsHelper.convertToElastic(e);
        }
        return scriptValues;
    }

    @Override
    public boolean containsKey(Object key) {
        // assume its a string...
        String fieldName = key.toString();
        ScriptDocValues scriptValues = localCacheFieldData.get(fieldName);
        return scriptValues != null || fieldTypeLookup.apply(fieldName) != null;
    }

    @Override
    public int size() {
        throw new UnsupportedOperationException();
    }

    @Override
    public boolean isEmpty() {
        throw new UnsupportedOperationException();
    }

    @Override
    public boolean containsValue(Object value) {
        throw new UnsupportedOperationException();
    }

    @Override
    public ScriptDocValues put(String key, ScriptDocValues value) {
        throw new UnsupportedOperationException();
    }

    @Override
    public ScriptDocValues remove(Object key) {
        throw new UnsupportedOperationException();
    }

    @Override
    public void putAll(Map> m) {
        throw new UnsupportedOperationException();
    }

    @Override
    public void clear() {
        throw new UnsupportedOperationException();
    }

    @Override
    public Set keySet() {
        throw new UnsupportedOperationException();
    }

    @Override
    public Collection> values() {
        throw new UnsupportedOperationException();
    }

    @Override
    public Set>> entrySet() {
        throw new UnsupportedOperationException();
    }
}