modelscreencondition.java

Sequoia ERP是一个真正的企业级开源ERP解决方案。它提供的模块包括：电子商务应用(e-commerce), POS系统(point of sales),知识管理,存货与仓库管理

/*
 * $Id: ModelScreenCondition.java 7061 2006-03-24 04:37:21Z jonesde $
 *
 * Copyright (c) 2004 The Open For Business Project - www.ofbiz.org
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT
 * OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR
 * THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
package org.ofbiz.widget.screen;

import java.io.Serializable;
import java.lang.reflect.Method;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;

import org.ofbiz.base.util.Debug;
import org.ofbiz.base.util.GeneralException;
import org.ofbiz.base.util.ObjectType;
import org.ofbiz.base.util.UtilXml;
import org.ofbiz.base.util.collections.FlexibleMapAccessor;
import org.ofbiz.base.util.string.FlexibleStringExpander;
import org.ofbiz.entity.GenericValue;
import org.ofbiz.entityext.permission.EntityPermissionChecker;
import org.ofbiz.minilang.operation.BaseCompare;
import org.ofbiz.security.Security;

import org.apache.oro.text.regex.MalformedPatternException;
import org.apache.oro.text.regex.Pattern;
import org.apache.oro.text.regex.PatternCompiler;
import org.apache.oro.text.regex.PatternMatcher;
import org.apache.oro.text.regex.Perl5Compiler;
import org.apache.oro.text.regex.Perl5Matcher;
import org.w3c.dom.Element;

/**
 * Widget Library - Screen model condition class
 *
 * @author     <a href="mailto:[e-mail]">David E. Jones</a>
 * @version    $Rev: 7061 $
 * @since      3.1
 */
public class ModelScreenCondition implements Serializable {
    public static final String module = ModelScreenCondition.class.getName();

    protected ModelScreen modelScreen;
    protected ScreenCondition rootCondition;

    public ModelScreenCondition(ModelScreen modelScreen, Element conditionElement) {
        this.modelScreen = modelScreen;
        Element firstChildElement = UtilXml.firstChildElement(conditionElement);
        this.rootCondition = readCondition(modelScreen, firstChildElement);
    }

    public boolean eval(Map context) {
        if (rootCondition == null) {
            return true;
        }
        return rootCondition.eval(context);
    }
    
    public static abstract class ScreenCondition implements Serializable {
        protected ModelScreen modelScreen;

        public ScreenCondition(ModelScreen modelScreen, Element conditionElement) {
            this.modelScreen = modelScreen;
        }
        
        public abstract boolean eval(Map context);
    }
    
    public static List readSubConditions(ModelScreen modelScreen, Element conditionElement) {
        List condList = new LinkedList();
        List subElementList = UtilXml.childElementList(conditionElement);
        Iterator subElementIter = subElementList.iterator();
        while (subElementIter.hasNext()) {
            Element subElement = (Element) subElementIter.next();
            condList.add(readCondition(modelScreen, subElement));
        }
        return condList;
    }
    
    public static ScreenCondition readCondition(ModelScreen modelScreen, Element conditionElement) {
        if (conditionElement == null) {
            return null;
        }
        if ("and".equals(conditionElement.getNodeName())) {
            return new And(modelScreen, conditionElement);
        } else if ("xor".equals(conditionElement.getNodeName())) {
            return new Xor(modelScreen, conditionElement);
        } else if ("or".equals(conditionElement.getNodeName())) {
            return new Or(modelScreen, conditionElement);
        } else if ("not".equals(conditionElement.getNodeName())) {
            return new Not(modelScreen, conditionElement);
        } else if ("if-has-permission".equals(conditionElement.getNodeName())) {
            return new IfHasPermission(modelScreen, conditionElement);
        } else if ("if-validate-method".equals(conditionElement.getNodeName())) {
            return new IfValidateMethod(modelScreen, conditionElement);
        } else if ("if-compare".equals(conditionElement.getNodeName())) {
            return new IfCompare(modelScreen, conditionElement);
        } else if ("if-compare-field".equals(conditionElement.getNodeName())) {
            return new IfCompareField(modelScreen, conditionElement);
        } else if ("if-regexp".equals(conditionElement.getNodeName())) {
            return new IfRegexp(modelScreen, conditionElement);
        } else if ("if-empty".equals(conditionElement.getNodeName())) {
            return new IfEmpty(modelScreen, conditionElement);
        } else if ("if-entity-permission".equals(conditionElement.getNodeName())) {
            return new IfEntityPermission(modelScreen, conditionElement);
        } else {
            throw new IllegalArgumentException("Condition element not supported with name: " + conditionElement.getNodeName());
        }
    }
    
    public static class And extends ScreenCondition {
        protected List subConditions;
        
        public And(ModelScreen modelScreen, Element condElement) {
            super (modelScreen, condElement);
            this.subConditions = readSubConditions(modelScreen, condElement);
        }
        
        public boolean eval(Map context) {
            // return false for the first one in the list that is false, basic and algo
            Iterator subConditionIter = this.subConditions.iterator();
            while (subConditionIter.hasNext()) {
                ScreenCondition subCondition = (ScreenCondition) subConditionIter.next();
                if (!subCondition.eval(context)) {
                    return false;
                }
            }
            return true;
        }
    }
    
    public static class Xor extends ScreenCondition {
        protected List subConditions;
        
        public Xor(ModelScreen modelScreen, Element condElement) {
            super (modelScreen, condElement);
            this.subConditions = readSubConditions(modelScreen, condElement);
        }
        
        public boolean eval(Map context) {
            // if more than one is true stop immediately and return false; if all are false return false; if only one is true return true
            boolean foundOneTrue = false;
            Iterator subConditionIter = this.subConditions.iterator();
            while (subConditionIter.hasNext()) {
                ScreenCondition subCondition = (ScreenCondition) subConditionIter.next();
                if (subCondition.eval(context)) {
                    if (foundOneTrue) {
                        // now found two true, so return false
                        return false;
                    } else {
                        foundOneTrue = true;
                    }
                }
            }
            return foundOneTrue;
        }
    }
    
    public static class Or extends ScreenCondition {
        protected List subConditions;
        
        public Or(ModelScreen modelScreen, Element condElement) {
            super (modelScreen, condElement);
            this.subConditions = readSubConditions(modelScreen, condElement);
        }
        
        public boolean eval(Map context) {
            // return true for the first one in the list that is true, basic or algo
            Iterator subConditionIter = this.subConditions.iterator();
            while (subConditionIter.hasNext()) {
                ScreenCondition subCondition = (ScreenCondition) subConditionIter.next();
                if (subCondition.eval(context)) {
                    return true;
                }
            }
            return false;
        }
    }
    
    public static class Not extends ScreenCondition {
        protected ScreenCondition subCondition;
        
        public Not(ModelScreen modelScreen, Element condElement) {
            super (modelScreen, condElement);
            Element firstChildElement = UtilXml.firstChildElement(condElement);
            this.subCondition = readCondition(modelScreen, firstChildElement);
        }
        
        public boolean eval(Map context) {
            return !this.subCondition.eval(context);
        }
    }
    
    public static class IfHasPermission extends ScreenCondition {
        protected FlexibleStringExpander permissionExdr;
        protected FlexibleStringExpander actionExdr;
        
        public IfHasPermission(ModelScreen modelScreen, Element condElement) {
            super (modelScreen, condElement);
            this.permissionExdr = new FlexibleStringExpander(condElement.getAttribute("permission"));
            this.actionExdr = new FlexibleStringExpander(condElement.getAttribute("action"));
        }
        
        public boolean eval(Map context) {
            // if no user is logged in, treat as if the user does not have permission
            GenericValue userLogin = (GenericValue) context.get("userLogin");
            if (userLogin != null) {
                String permission = permissionExdr.expandString(context);
                String action = actionExdr.expandString(context);
                
                Security security = (Security) context.get("security");
                if (action != null && action.length() > 0) {
                    // run hasEntityPermission
                    if (security.hasEntityPermission(permission, action, userLogin)) {
                        return true;
                    }
                } else {