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/*
 Copyright 2013 Red Hat, Inc. and/or its affiliates.

 This file is part of lightblue.

 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with this program.  If not, see .
 */
package com.redhat.lightblue.assoc.ep;

import java.util.List;
import java.util.stream.Stream;

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.node.ObjectNode;
import com.fasterxml.jackson.databind.node.JsonNodeFactory;

/**
 * Copies the results from another step
 */
public class Copy extends AbstractSearchStep {

    private final Source source;

    public Copy(ExecutionBlock block, Source source) {
        super(block);
        this.source = source;
    }

    @Override
    public StepResult getResults(ExecutionContext ctx) {
        return new StepResultWrapper(source.getStep().getResults(ctx)) {
            @Override
            public Stream stream() {
                // Create new documents for each document in the source. This will
                // create the correct slots based on this execution block
                return super.stream().map(d -> new ResultDocument(block, d.getDoc()));
            }
        };
    }

    @Override
    protected final List getSearchResults(ExecutionContext ctx) {
        // This should be called at all
        throw new IllegalStateException();
    }

    @Override
    public JsonNode toJson() {
        ObjectNode node = JsonNodeFactory.instance.objectNode();
        node.set("copy", source.getStep().toJson());
        return node;
    }
}