Struts example source code file (OgnlValueStackFactory.java)

This example Struts source code file (OgnlValueStackFactory.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Struts tags/keywords

class, class, compoundrootaccessor, couldn't, illegalstateexception, inject, inject, ognlvaluestack, ognlvaluestackfactory, string, string, util, valuestack, valuestack, xworkconverter

The Struts OgnlValueStackFactory.java source code

/*
 * Copyright 2002-2006,2009 The Apache Software Foundation.
 * 
 * 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.opensymphony.xwork2.ognl;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.TextProvider;
import com.opensymphony.xwork2.conversion.NullHandler;
import com.opensymphony.xwork2.conversion.impl.XWorkConverter;
import com.opensymphony.xwork2.inject.Container;
import com.opensymphony.xwork2.inject.Inject;
import com.opensymphony.xwork2.ognl.accessor.CompoundRootAccessor;
import com.opensymphony.xwork2.util.CompoundRoot;
import com.opensymphony.xwork2.util.ValueStack;
import com.opensymphony.xwork2.util.ValueStackFactory;
import ognl.MethodAccessor;
import ognl.OgnlRuntime;
import ognl.PropertyAccessor;

import java.util.Map;
import java.util.Set;

/**
 * Creates an Ognl value stack
 */
public class OgnlValueStackFactory implements ValueStackFactory {
    
    private XWorkConverter xworkConverter;
    private CompoundRootAccessor compoundRootAccessor;
    private TextProvider textProvider;
    private Container container;
    private boolean allowStaticMethodAccess;

    @Inject
    public void setXWorkConverter(XWorkConverter conv) {
        this.xworkConverter = conv;
    }
    
    @Inject("system")
    public void setTextProvider(TextProvider textProvider) {
        this.textProvider = textProvider;
    }
    
    @Inject(value="allowStaticMethodAccess", required=false)
    public void setAllowStaticMethodAccess(String allowStaticMethodAccess) {
        this.allowStaticMethodAccess = "true".equalsIgnoreCase(allowStaticMethodAccess);
    }

    public ValueStack createValueStack() {
        ValueStack stack = new OgnlValueStack(xworkConverter, compoundRootAccessor, textProvider, allowStaticMethodAccess);
        container.inject(stack);
        stack.getContext().put(ActionContext.CONTAINER, container);
        return stack;
    }

    public ValueStack createValueStack(ValueStack stack) {
        ValueStack result = new OgnlValueStack(stack, xworkConverter, compoundRootAccessor, allowStaticMethodAccess);
        container.inject(result);
        stack.getContext().put(ActionContext.CONTAINER, container);
        return result;
    }
    
    @Inject
    public void setContainer(Container container) throws ClassNotFoundException {
        Set<String> names = container.getInstanceNames(PropertyAccessor.class);
        if (names != null) {
            for (String name : names) {
                Class cls = Class.forName(name);
                if (cls != null) {
                    if (Map.class.isAssignableFrom(cls)) {
                        PropertyAccessor acc = container.getInstance(PropertyAccessor.class, name);
                    }
                    OgnlRuntime.setPropertyAccessor(cls, container.getInstance(PropertyAccessor.class, name));
                    if (compoundRootAccessor == null && CompoundRoot.class.isAssignableFrom(cls)) {
                        compoundRootAccessor = (CompoundRootAccessor) container.getInstance(PropertyAccessor.class, name);
                    }
                }
            }
        }
        
        names = container.getInstanceNames(MethodAccessor.class);
        if (names != null) {
            for (String name : names) {
                Class cls = Class.forName(name);
                if (cls != null) {
                    OgnlRuntime.setMethodAccessor(cls, container.getInstance(MethodAccessor.class, name));
                }
            }
        }
        
        names = container.getInstanceNames(NullHandler.class);
        if (names != null) {
            for (String name : names) {
                Class cls = Class.forName(name);
                if (cls != null) {
                    OgnlRuntime.setNullHandler(cls, new OgnlNullHandlerWrapper(container.getInstance(NullHandler.class, name)));
                }
            }
        }
        if (compoundRootAccessor == null) {
            throw new IllegalStateException("Couldn't find the compound root accessor");
        }
        this.container = container;
    }
}