simpleexpression.java

国外的一套开源CRM

/*
 * 
 * Copyright (c) 2004 SourceTap - www.sourcetap.com
 *
 *  The contents of this file are subject to the SourceTap Public License 
 * ("License"); You may not use this file except in compliance with the 
 * License. You may obtain a copy of the License at http://www.sourcetap.com/license.htm
 * Software distributed under the License is distributed on an  "AS IS"  basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for
 * the specific language governing rights and limitations under the License.
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 */

package com.sourcetap.sfa.util;


/**
 * @author sfowler
 *
 * Provides simple string comparison functionality.
 *
 */
public class SimpleExpression {
    public static final String EQUAL = "EQUAL";
    public static final String NOT_EQUAL = "NOT_EQUAL";
    public static final String STARTS_WITH = "STARTS_WITH";
    public static final String NOT_STARTS_WITH = "NOT_STARTS_WITH";
    public static final String CONTAINS = "CONTAINS";
    public static final String NOT_CONTAINS = "NOT_CONTAINS";
    public static final String LESS_THAN = "LESS_THAN";
    public static final String LESS_OR_EQUAL = "LESS_OR_EQUAL";
    public static final String GREATER_THAN = "GREATER_THAN";
    public static final String GREATER_OR_EQUAL = "GREAT";

    /**
     * DOCUMENT ME!
     *
     * @param lhs_ 
     * @param operator 
     * @param rhs_ 
     *
     * @return 
     */
    public static boolean compare(String lhs_, String operator, String rhs_) {
        String lhs = (lhs_ == null) ? "" : lhs_;
        String rhs = (rhs_ == null) ? "" : rhs_;

        if (operator.equals(SimpleExpression.STARTS_WITH)) {
            if (lhs.startsWith(rhs)) {
                return true;
            } else {
                return false;
            }
        } else if (operator.equals(SimpleExpression.NOT_STARTS_WITH)) {
            if (lhs.startsWith(rhs)) {
                return false;
            } else {
                return true;
            }
        } else if (operator.equals(SimpleExpression.EQUAL)) {
            if (lhs.equals(rhs)) {
                return true;
            } else {
                return false;
            }
        } else if (operator.equals(SimpleExpression.NOT_EQUAL)) {
            if (lhs.equals(rhs)) {
                return false;
            } else {
                return true;
            }
        } else if (operator.equals(SimpleExpression.CONTAINS)) {
            if (lhs.indexOf(rhs) >= 0) {
                return true;
            } else {
                return false;
            }
        } else if (operator.equals(SimpleExpression.NOT_CONTAINS)) {
            if (lhs.indexOf(rhs) >= 0) {
                return false;
            } else {
                return true;
            }
        } else if (operator.equals(SimpleExpression.LESS_THAN)) {
            if (lhs.compareTo(rhs) < 0) {
                return true;
            } else {
                return false;
            }
        } else if (operator.equals(SimpleExpression.LESS_OR_EQUAL)) {
            if (lhs.compareTo(rhs) <= 0) {
                return true;
            } else {
                return false;
            }
        } else if (operator.equals(SimpleExpression.GREATER_THAN)) {
            if (lhs.compareTo(rhs) > 0) {
                return true;
            } else {
                return false;
            }
        } else if (operator.equals(SimpleExpression.GREATER_OR_EQUAL)) {
            if (lhs.compareTo(rhs) >= 0) {
                return true;
            } else {
                return false;
            }
        }

        return false;
    }
}