run.halo.app.extension.index.query.SimpleQuery Maven / Gradle / Ivy

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package run.halo.app.extension.index.query;

import lombok.Getter;
import org.apache.commons.lang3.StringUtils;
import org.springframework.util.Assert;

@Getter
public abstract class SimpleQuery implements Query {
    protected final String fieldName;
    protected final String value;
    /**
     * Whether the value if a field reference.
     * For example, {@code fieldName = "salary", value = "cost"} can lead to a query：
     *      *     salary > cost
     * 
     * means that we want to find all the records whose salary is greater than cost.
     *
     * @see EqualQuery
     * @see GreaterThanQuery
     * @see LessThanQuery
     */
    protected final boolean isFieldRef;

    protected SimpleQuery(String fieldName, String value) {
        this(fieldName, value, false);
    }

    protected SimpleQuery(String fieldName, String value, boolean isFieldRef) {
        Assert.isTrue(StringUtils.isNotBlank(fieldName), "fieldName cannot be blank.");
        this.fieldName = fieldName;
        this.value = value;
        this.isFieldRef = isFieldRef;
    }
}