/*
* Copyright 2004-2005 the original author or authors.
*
* 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 org.springmodules.validation.valang.functions;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Map;
import org.apache.commons.collections.MapUtils;
import org.apache.commons.lang.StringUtils;
import org.springframework.beans.BeanWrapper;
import org.springframework.beans.BeanWrapperImpl;
/**
* <p>Function taking the value from a bean property or a java.util.Map instance.
*
* @author Steven Devijver
* @since Apr 23, 2005
*/
public class BeanPropertyFunction implements Function {
private String field = null;
public BeanPropertyFunction(String field) {
super();
this.field = field;
}
public String getField() {
return this.field;
}
public Object getResult(Object target) {
String fieldName = getField();
if ("this".equals(fieldName)) {
return target;
}
if (fieldName.startsWith("this.")) {
fieldName = field.substring(5);
}
if (target instanceof Map) {
return getValue((Map) target, split(fieldName));
}
if (target instanceof BeanWrapper) {
return ((BeanWrapper) target).getPropertyValue(fieldName);
}
return new BeanWrapperImpl(target).getPropertyValue(fieldName);
}
private String[] split(String path) {
return StringUtils.split(path, '.');
}
private String[] pop(String[] path) {
Collection coll = new ArrayList();
for (int i = 1; i < path.length; i++) {
coll.add(path[i]);
}
return (String[]) coll.toArray(new String[]{});
}
private String concat(String[] path) {
StringBuffer sb = new StringBuffer();
for (int i = 0; i < path.length; i++) {
sb.append(path[i]);
sb.append(".");
}
sb.setLength(sb.length() - 1);
return sb.toString();
}
private Object getValue(Map map, String[] path) {
if (path.length > 0) {
Object result = MapUtils.getObject(map, path[0]);
if (path.length > 1) {
return new BeanPropertyFunction(concat(pop(path))).getResult(result);
} else {
return result;
}
}
return null;
}
}