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 java.util.Collection; 018 019/** 020 * Converts from {@link java.util.Collection}to Boolean; a non-empty collection is true. 021 * 022 * @author Howard M. Lewis Ship 023 */ 024public final class CollectionToBooleanConverter implements TypeConverter 025{ 026 public Object convertValue(Object value) 027 { 028 Collection c = (Collection) value; 029 030 return c.isEmpty() ? Boolean.FALSE : Boolean.TRUE; 031 } 032 033}