com.impetus.client.redis.RedisQueryInterpreter.java Source code

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Here is the source code for com.impetus.client.redis.RedisQueryInterpreter.java

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/*******************************************************************************
 * * Copyright 2012 Impetus Infotech.
 *  *
 *  * Licensed 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 com.impetus.client.redis;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.commons.lang.StringUtils;

import com.impetus.kundera.property.PropertyAccessorHelper;

/**
 * Query interpreter responsible for: <li>Determine if it is a query by id.</li>
 * <li>holds value and clause(UNION or INTERSECT REDIS clause for sorted set)</li>
 * 
 * @author vivek.mishra
 * 
 */
class RedisQueryInterpreter {

    private boolean isById;

    private Map<String, Double> min;

    private Map<String, Double> max;

    private Clause clause;

    private Object value;

    private String fieldName;

    private Map<String, Object> fields;

    private String[] columns;

    private static Map<String, Clause> clauseMapper = new HashMap<String, Clause>();
    static {
        clauseMapper.put("AND", Clause.INTERSECT);
        clauseMapper.put("OR", Clause.UNION);
    }

    enum Clause {
        UNION, INTERSECT;
    }

    static Clause getMappedClause(String intraClause) {
        return clauseMapper.get(intraClause);
    }

    /**
     * Default constructor
     */
    public RedisQueryInterpreter(String[] columns) {
        this.columns = columns;
    }

    boolean isById() {
        return isById;
    }

    void setById(boolean isById) {
        this.isById = isById;
    }

    Clause getClause() {
        return clause;
    }

    void setClause(Clause clause) {
        this.clause = clause;
    }

    boolean isByRange() {
        return min != null || max != null;
    }

    Object getValue() {
        return value;
    }

    void setValue(Object value) {
        this.value = value;
        if (this.fields != null) {
            fields.put(fieldName, value);
        }
    }

    Map<String, Double> getMin() {
        return min;
    }

    void setMin(String field, Object fieldValue) {
        this.min = new HashMap<String, Double>(1);
        this.min.put(field,
                !StringUtils.isNumeric(fieldValue.toString())
                        ? Double.valueOf(PropertyAccessorHelper.getString(fieldValue).hashCode())
                        : Double.valueOf(fieldValue.toString()));
    }

    Map<String, Double> getMax() {
        return max;
    }

    void setMax(String field, Object fieldValue) {
        this.max = new HashMap<String, Double>(1);
        this.max.put(field,
                !StringUtils.isNumeric(fieldValue.toString())
                        ? Double.valueOf(PropertyAccessorHelper.getString(fieldValue).hashCode())
                        : Double.valueOf(fieldValue.toString()));
    }

    String getFieldName() {
        return fieldName;
    }

    void setFieldName(String fieldName) {
        this.fieldName = fieldName;
        if (fields == null) {
            fields = new HashMap<String, Object>(2);
        }
        fields.put(fieldName, null);
    }

    Map<String, Object> getFields() {
        return fields;
    }

    List<byte[]> getColumns() {
        if (columns != null && columns.length > 0) {
            // byte[] fields = new byte[columns.length][1];
            List<byte[]> fields = new ArrayList<byte[]>(columns.length);
            for (int i = 0; i < columns.length; i++) {
                if (columns[i] != null /* && columns[i].indexOf(".") >= 0 */) {
                    byte[] f = PropertyAccessorHelper.getBytes(columns[i]);
                    fields.add(f);
                }
            }

            return fields.isEmpty() ? null : fields;
        }

        return null;
    }

    String[] getSelectedColumns() {

        return columns;
    }

}