/*
* 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.isis.applib.util;
/**
* Helper class to create properly concatenated reason string for use in method
* that return {@link String}s with reasons.
*
* <p>
* If no reasons are specified {@link #getReason()} will return
* <code>null</code> , otherwise it will return a {@link String} with all the
* valid reasons concatenated with a semi-colon separating each one.
*
* <p>
* An alternative is to use the {@link Reasons} class.
*/
public class ReasonBuffer {
StringBuffer reasonBuffer = new StringBuffer();
/**
* Append a reason to the list of existing reasons.
*/
public void append(final String reason) {
if (reason != null) {
if (reasonBuffer.length() > 0) {
reasonBuffer.append("; ");
}
reasonBuffer.append(reason);
}
}
/**
* Append a reason to the list of existing reasons if the condition flag is
* true.
*/
public void appendOnCondition(final boolean condition, final String reason) {
if (condition) {
append(reason);
}
}
/**
* Return the combined set of reasons, or <code>null</code> if there are
* none.
*/
public String getReason() {
return reasonBuffer.length() == 0 ? null : reasonBuffer.toString();
}
}