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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.phoenix.hive.ql.index;

import org.apache.hadoop.hive.ql.plan.ExprNodeColumnDesc;
import org.apache.hadoop.hive.ql.plan.ExprNodeConstantDesc;
import org.apache.hadoop.hive.ql.plan.ExprNodeGenericFuncDesc;

/**
 * IndexSearchCondition represents an individual search condition found by
 * {@link IndexPredicateAnalyzer}.
 *
 */
public class IndexSearchCondition {
    private ExprNodeColumnDesc columnDesc;
    private String comparisonOp;
    private ExprNodeConstantDesc constantDesc;
    private ExprNodeGenericFuncDesc comparisonExpr;

    private String[] fields;

    // Support (Not) Between/(Not) In Operator
    private ExprNodeConstantDesc[] multiConstants;
    private boolean isNot;

    public IndexSearchCondition(ExprNodeColumnDesc columnDesc, String comparisonOp,
                                ExprNodeConstantDesc[] multiConstants, ExprNodeGenericFuncDesc
                                        comparisonExpr, boolean isNot) {
        this(columnDesc, comparisonOp, multiConstants, comparisonExpr, null, isNot);
    }

    public IndexSearchCondition(ExprNodeColumnDesc columnDesc, String comparisonOp,
                                ExprNodeConstantDesc[] multiConstants, ExprNodeGenericFuncDesc
                                        comparisonExpr, String[] fields, boolean isNot) {
        this.columnDesc = columnDesc;
        this.comparisonOp = comparisonOp;
        this.multiConstants = multiConstants;
        this.comparisonExpr = comparisonExpr;
        this.fields = fields;
        this.isNot = isNot;
    }

    public ExprNodeConstantDesc[] getConstantDescs() {
        return multiConstants;
    }

    public ExprNodeConstantDesc getConstantDesc(int index) {
        return multiConstants[index];
    }

    public boolean isNot() {
        return isNot;
    }
    //////////////////////////////////////////////////////////////////////////////

    public IndexSearchCondition(ExprNodeColumnDesc columnDesc, String comparisonOp,
                                ExprNodeConstantDesc constantDesc, ExprNodeGenericFuncDesc
                                        comparisonExpr) {
        this(columnDesc, comparisonOp, constantDesc, comparisonExpr, null);
    }

    /**
     * Constructs a search condition, which takes the form
     * 
     * 
     * column-ref comparison-op constant-value
     * 
     * 
     * .
     *
     * @param columnDesc     column being compared
     * @param comparisonOp   comparison operator, e.g. "=" (taken from
     *                       GenericUDFBridge.getUdfName())
     * @param constantDesc   constant value to search for
     * @param comparisonExpr the original comparison expression
     */
    public IndexSearchCondition(ExprNodeColumnDesc columnDesc, String comparisonOp,
                                ExprNodeConstantDesc constantDesc, ExprNodeGenericFuncDesc
                                        comparisonExpr, String[] fields) {

        this.columnDesc = columnDesc;
        this.comparisonOp = comparisonOp;
        this.constantDesc = constantDesc;
        this.comparisonExpr = comparisonExpr;
        this.fields = fields;
    }

    public void setColumnDesc(ExprNodeColumnDesc columnDesc) {
        this.columnDesc = columnDesc;
    }

    public ExprNodeColumnDesc getColumnDesc() {
        return columnDesc;
    }

    public void setComparisonOp(String comparisonOp) {
        this.comparisonOp = comparisonOp;
    }

    public String getComparisonOp() {
        return comparisonOp;
    }

    public void setConstantDesc(ExprNodeConstantDesc constantDesc) {
        this.constantDesc = constantDesc;
    }

    public ExprNodeConstantDesc getConstantDesc() {
        return constantDesc;
    }

    public void setComparisonExpr(ExprNodeGenericFuncDesc comparisonExpr) {
        this.comparisonExpr = comparisonExpr;
    }

    public ExprNodeGenericFuncDesc getComparisonExpr() {
        return comparisonExpr;
    }

    public String[] getFields() {
        return fields;
    }

    @Override
    public String toString() {
        return comparisonExpr.getExprString();
    }
}