001// Copyright 2008, 2011 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.tapestry5.corelib.components;
016
017import org.apache.tapestry5.MarkupWriter;
018import org.apache.tapestry5.annotations.Mixin;
019import org.apache.tapestry5.annotations.Parameter;
020import org.apache.tapestry5.corelib.mixins.DiscardBody;
021
022import java.util.regex.Pattern;
023
024/**
025 * Outputs paragraph oriented text, typically collected via a {@link org.apache.tapestry5.corelib.components.TextArea}
026 * component.  The TextArea is split into lines, and each line it output inside its own <p> element.
027 * 
028 * @see TextArea
029 * @tapestrydoc
030 */
031public class TextOutput
032{
033    @Parameter(required = true)
034    private String value;
035
036    @Mixin
037    private DiscardBody discardBody;
038
039    private static final Pattern SPLIT_PATTERN = Pattern.compile("((\\r\\n)|\\r|\\n)", Pattern.MULTILINE);
040
041    void beginRender(MarkupWriter writer)
042    {
043        if (value == null) return;
044
045        String[] lines = SPLIT_PATTERN.split(value);
046
047        for (String line : lines)
048        {
049            writer.element("p");
050
051            writer.write(line.trim());
052
053            writer.end();
054        }
055    }
056
057    void injectValue(String value)
058    {
059        this.value = value;
060    }
061}