001// Copyright 2004, 2005 The Apache Software Foundation 002// 003// Licensed under the Apache License, Version 2.0 (the "License"); 004// you may not use this file except in compliance with the License. 005// You may obtain a copy of the License at 006// 007// http://www.apache.org/licenses/LICENSE-2.0 008// 009// Unless required by applicable law or agreed to in writing, software 010// distributed under the License is distributed on an "AS IS" BASIS, 011// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 012// See the License for the specific language governing permissions and 013// limitations under the License. 014 015package org.apache.tapestry.coerce; 016 017import org.apache.hivemind.HiveMind; 018 019/** 020 * Converts a String to a Boolean. Strings that do contain non-whitespace are considered true. As a 021 * special case, the string "false" evaluates to false (this allow boolean component parameters to 022 * be bound to "false" instead of "ognl:false" and still operate as expected). 023 * 024 * @author Howard M. Lewis Ship 025 * @since 4.0 026 */ 027public final class StringToBooleanConverter implements TypeConverter 028{ 029 030 public Object convertValue(Object value) 031 { 032 String s = (String) value; 033 034 boolean b = HiveMind.isNonBlank(s) && !s.equals("false"); 035 036 // JDK 1.4 has a Boolean.valueOf(), but we're trying for 1.3 compatibility 037 038 return b ? Boolean.TRUE : Boolean.FALSE; 039 } 040 041}