/*
* $Id: IteratorGenerator.java 651946 2008-04-27 13:41:38Z apetrelli $
*
* 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.util;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.StringTokenizer;
import com.opensymphony.xwork2.Action;
import com.opensymphony.xwork2.util.logging.Logger;
import com.opensymphony.xwork2.util.logging.LoggerFactory;
/**
* A bean that generates an iterator filled with a given object depending on the count,
* separator and converter defined. It is being used by IteratorGeneratorTag.
*
*/
public class IteratorGenerator implements Iterator, Action {
private static final Logger LOG = LoggerFactory.getLogger(IteratorGenerator.class);
List values;
Object value;
String separator;
Converter converter;
// Attributes ----------------------------------------------------
int count = 0;
int currentCount = 0;
public void setCount(int aCount) {
this.count = aCount;
}
public boolean getHasNext() {
return hasNext();
}
public Object getNext() {
return next();
}
public void setSeparator(String aChar) {
separator = aChar;
}
public void setConverter(Converter aConverter) {
converter = aConverter;
}
// Public --------------------------------------------------------
public void setValues(Object aValue) {
value = aValue;
}
// Action implementation -----------------------------------------
public String execute() {
if (value == null) {
return ERROR;
} else {
values = new ArrayList();
if (separator != null) {
StringTokenizer tokens = new StringTokenizer(value.toString(), separator);
while (tokens.hasMoreTokens()) {
String token = tokens.nextToken().trim();
if (converter != null) {
try {
Object convertedObj = converter.convert(token);
values.add(convertedObj);
}
catch(Exception e) { // make sure things, goes on, we just ignore the bad ones
LOG.warn("unable to convert ["+token+"], skipping this token, it will not appear in the generated iterator", e);
}
}
else {
values.add(token);
}
}
} else {
values.add(value.toString());
}
// Count default is the size of the list of values
if (count == 0) {
count = values.size();
}
return SUCCESS;
}
}
// Iterator implementation ---------------------------------------
public boolean hasNext() {
return (value == null) ? false : ((currentCount < count) || (count == -1));
}
public Object next() {
try {
return values.get(currentCount % values.size());
} finally {
currentCount++;
}
}
public void remove() {
throw new UnsupportedOperationException("Remove is not supported in IteratorGenerator.");
}
// Inner class --------------------------------------------------
/**
* Interface for converting each separated token into an Object of choice.
*/
public static interface Converter {
Object convert(String token) throws Exception;
}
}
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