| /* |
| * 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.struts2.views.velocity.components; |
| |
| import java.io.IOException; |
| import java.io.Writer; |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| import javax.servlet.http.HttpServletRequest; |
| import javax.servlet.http.HttpServletResponse; |
| |
| import org.apache.struts2.ServletActionContext; |
| import org.apache.struts2.components.Component; |
| import org.apache.velocity.context.InternalContextAdapter; |
| import org.apache.velocity.exception.MethodInvocationException; |
| import org.apache.velocity.exception.ParseErrorException; |
| import org.apache.velocity.exception.ResourceNotFoundException; |
| import org.apache.velocity.runtime.directive.Directive; |
| import org.apache.velocity.runtime.parser.node.Node; |
| |
| import com.opensymphony.xwork2.ActionContext; |
| import com.opensymphony.xwork2.inject.Container; |
| import com.opensymphony.xwork2.util.ValueStack; |
| |
| public abstract class AbstractDirective extends Directive { |
| public String getName() { |
| return "s" + getBeanName(); |
| } |
| |
| public abstract String getBeanName(); |
| |
| /** |
| * @return All components, unless otherwise stated, are LINE-level directives. |
| * |
| */ |
| public int getType() { |
| return LINE; |
| } |
| |
| protected abstract Component getBean(ValueStack stack, HttpServletRequest req, HttpServletResponse res); |
| |
| public boolean render(InternalContextAdapter ctx, Writer writer, Node node) throws IOException, ResourceNotFoundException, ParseErrorException, MethodInvocationException { |
| // get the bean |
| ValueStack stack = (ValueStack) ctx.get("stack"); |
| HttpServletRequest req = (HttpServletRequest) stack.getContext().get(ServletActionContext.HTTP_REQUEST); |
| HttpServletResponse res = (HttpServletResponse) stack.getContext().get(ServletActionContext.HTTP_RESPONSE); |
| Component bean = getBean(stack, req, res); |
| Container container = (Container) stack.getContext().get(ActionContext.CONTAINER); |
| container.inject(bean); |
| // get the parameters |
| Map params = createPropertyMap(ctx, node); |
| bean.copyParams(params); |
| //bean.addAllParameters(params); |
| bean.start(writer); |
| |
| if (getType() == BLOCK) { |
| Node body = node.jjtGetChild(node.jjtGetNumChildren() - 1); |
| body.render(ctx, writer); |
| } |
| |
| bean.end(writer, ""); |
| return true; |
| } |
| |
| /** |
| * <p> |
| * Create a Map of properties that the user has passed in. For example: |
| * </p> |
| * |
| * <pre> |
| * #xxx("name=hello" "value=world" "template=foo") |
| * </pre> |
| * |
| * <p> |
| * would yield a params that contains {["name", "hello"], ["value", "world"], ["template", "foo"]} |
| * </p> |
| * @param contextAdapter the context adapter |
| * @param node the Node passed in to the render method |
| * @return a Map of the user specified properties |
| * @throws org.apache.velocity.exception.ParseErrorException |
| * if the was an error in the format of the property |
| */ |
| protected Map createPropertyMap(InternalContextAdapter contextAdapter, Node node) throws ParseErrorException, MethodInvocationException { |
| Map propertyMap; |
| |
| int children = node.jjtGetNumChildren(); |
| if (getType() == BLOCK) { |
| children--; |
| } |
| |
| // Velocity supports an on-the-fly Map-definition syntax that leads |
| // to more readable and faster code: |
| // |
| // #url({'id':'url', 'action':'MyAction'}) |
| // |
| // We support this syntax by checking for a single Map argument |
| // to any directive and using that as the property map instead |
| // of building one from individual name-value pair strings. |
| Node firstChild = null; |
| Object firstValue = null; |
| if(children == 1 |
| && null != (firstChild = node.jjtGetChild(0)) |
| && null != (firstValue = firstChild.value(contextAdapter)) |
| && firstValue instanceof Map) { |
| propertyMap = (Map)firstValue; |
| } else { |
| propertyMap = new HashMap(); |
| |
| for (int index = 0, length = children; index < length; index++) { |
| this.putProperty(propertyMap, contextAdapter, node.jjtGetChild(index)); |
| } |
| } |
| |
| return propertyMap; |
| } |
| |
| /** |
| * adds a given Node's key/value pair to the propertyMap. For example, if this Node contained the value "rows=20", |
| * then the key, rows, would be added to the propertyMap with the String value, 20. |
| * |
| * @param propertyMap a params containing all the properties that we wish to set |
| * @param contextAdapter the context adapter |
| * @param node the parameter to set expressed in "name=value" format |
| * |
| * @throws ParseErrorException in case of parsing errors |
| * @throws MethodInvocationException in case of method invocation errors |
| */ |
| protected void putProperty(Map propertyMap, InternalContextAdapter contextAdapter, Node node) throws ParseErrorException, MethodInvocationException { |
| // node.value uses the StrutsValueStack to evaluate the directive's value parameter |
| String param = node.value(contextAdapter).toString(); |
| |
| int idx = param.indexOf('='); |
| |
| if (idx != -1) { |
| String property = param.substring(0, idx); |
| |
| String value = param.substring(idx + 1); |
| propertyMap.put(property, value); |
| } else { |
| throw new ParseErrorException("#" + this.getName() + " arguments must include an assignment operator! For example #tag( Component \"template=mytemplate\" ). #tag( TextField \"mytemplate\" ) is illegal!"); |
| } |
| } |
| } |