Quelle SetNextRule.java Sprache: JAVA

/*
* 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.tomcat.util.digester;

import org.apache.tomcat.util.IntrospectionUtils;

/**
* Rule implementation that calls a method on the (top-1) (parent)
* object, passing the top object (child) as an argument. It is
* commonly used to establish parent-child relationships.
*
* This rule now supports more flexible method matching by default.
* It is possible that this may break (some) code
* written against release 1.1.1 or earlier.
* See {@link #isExactMatch()} for more details.
*/

public class SetNextRule extends Rule {

 // ----------------------------------------------------------- Constructors

 /**
 * Construct a "set next" rule with the specified method name.
 *
 * @param methodName Method name of the parent method to call
 * @param paramType Java class of the parent method's argument
 * (if you wish to use a primitive type, specify the corresponding
 * Java wrapper class instead, such as <code>java.lang.Boolean</code>
 * for a <code>boolean</code> parameter)
 */
 public SetNextRule(String methodName,
 String paramType) {

 this.methodName = methodName;
 this.paramType = paramType;

 }

 // ----------------------------------------------------- Instance Variables

 /**
 * The method name to call on the parent object.
 */
 protected String methodName = null;

 /**
 * The Java class name of the parameter type expected by the method.
 */
 protected String paramType = null;

 /**
 * Should we use exact matching. Default is no.
 */
 protected boolean useExactMatch = false;

 // --------------------------------------------------------- Public Methods

 /**
 * Is exact matching being used.
 *
 * This rule uses <code>org.apache.commons.beanutils.MethodUtils</code>
 * to introspect the relevant objects so that the right method can be called.
 * Originally, <code>MethodUtils.invokeExactMethod</code> was used.
 * This matches methods very strictly
 * and so may not find a matching method when one exists.
 * This is still the behaviour when exact matching is enabled.
 *
 * When exact matching is disabled, <code>MethodUtils.invokeMethod</code> is used.
 * This method finds more methods but is less precise when there are several methods
 * with correct signatures.
 * So, if you want to choose an exact signature you might need to enable this property.
 *
 * The default setting is to disable exact matches.
 *
 * @return true iff exact matching is enabled
 * @since Digester Release 1.1.1
 */
 public boolean isExactMatch() {

 return useExactMatch;
 }

 /**
 * Set whether exact matching is enabled.
 *
 * See {@link #isExactMatch()}.
 *
 * @param useExactMatch should this rule use exact method matching
 * @since Digester Release 1.1.1
 */
 public void setExactMatch(boolean useExactMatch) {

 this.useExactMatch = useExactMatch;
 }

 /**
 * Process the end of this element.
 *
 * @param namespace the namespace URI of the matching element, or an
 * empty string if the parser is not namespace aware or the element has
 * no namespace
 * @param name the local name if the parser is namespace aware, or just
 * the element name otherwise
 */
 @Override
 public void end(String namespace, String name) throws Exception {

 // Identify the objects to be used
 Object child = digester.peek(0);
 Object parent = digester.peek(1);
 if (digester.log.isDebugEnabled()) {
 if (parent == null) {
 digester.log.debug("[SetNextRule]{" + digester.match +
 "} Call [NULL PARENT]." +
 methodName + "(" + child + ")");
 } else {
 digester.log.debug("[SetNextRule]{" + digester.match +
 "} Call " + parent.getClass().getName() + "." +
 methodName + "(" + child + ")");
 }
 }

 // Call the specified method
 IntrospectionUtils.callMethod1(parent, methodName,
 child, paramType, digester.getClassLoader());

 StringBuilder code = digester.getGeneratedCode();
 if (code != null) {
 code.append(digester.toVariableName(parent)).append('.');
 code.append(methodName).append('(').append(digester.toVariableName(child)).append(");");
 code.append(System.lineSeparator());
 }
 }

 /**
 * Render a printable version of this Rule.
 */
 @Override
 public String toString() {
 StringBuilder sb = new StringBuilder("SetNextRule[");
 sb.append("methodName=");
 sb.append(methodName);
 sb.append(", paramType=");
 sb.append(paramType);
 sb.append(']');
 return sb.toString();
 }

}

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