document/src/main/java/com/yahoo/document/select/rule/DocumentNode.java


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// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.document.select.rule;

import com.yahoo.document.*;
import com.yahoo.document.select.BucketSet;
import com.yahoo.document.select.Context;
import com.yahoo.document.select.OrderingSpecification;
import com.yahoo.document.select.Visitor;

/**
 * @author <a href="mailto:simon@yahoo-inc.com">Simon Thoresen</a>
 */
public class DocumentNode implements ExpressionNode {

    private String type;

    public DocumentNode(String type) {
        this.type = type;
    }

    public String getType() {
        return type;
    }

    public DocumentNode setType(String type) {
        this.type = type;
        return this;
    }

    @Override
    public BucketSet getBucketSet(BucketIdFactory factory) {
        return null;
    }

    @Override
    public Object evaluate(Context context) {
        return evaluate(context.getDocumentOperation());
    }

    public Object evaluate(DocumentOperation op) {
        DocumentType doct;
        if (op instanceof DocumentPut) {
            doct = ((DocumentPut)op).getDocument().getDataType();
        } else if (op instanceof DocumentUpdate) {
            doct = ((DocumentUpdate)op).getDocumentType();
        } else {
            throw new IllegalStateException("Document class '" + op.getClass().getName() + "' is not supported.");
        }
        return doct.isA(this.type) ? op : Boolean.FALSE;
    }

    public void accept(Visitor visitor) {
        visitor.visit(this);
    }

    @Override
    public String toString() {
        return type;
    }

    @Override
    public OrderingSpecification getOrdering(int order) {
        return null;
    }
}