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// Jericho HTML Parser - Java based library for analysing and manipulating HTML
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// Version 3.2
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// Copyright (C) 2004-2009 Martin Jericho
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// http://jericho.htmlparser.net/
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of either one of the following licences:
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//
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// 1. The Eclipse Public License (EPL) version 1.0,
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// included in this distribution in the file licence-epl-1.0.html
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// or available at http://www.eclipse.org/legal/epl-v10.html
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//
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// 2. The GNU Lesser General Public License (LGPL) version 2.1 or later,
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// included in this distribution in the file licence-lgpl-2.1.txt
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// or available at http://www.gnu.org/licenses/lgpl.txt
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//
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// This library is distributed on an "AS IS" basis,
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// WITHOUT WARRANTY OF ANY KIND, either express or implied.
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// See the individual licence texts for more details.
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package net.htmlparser.jericho;
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import java.util.*;
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import java.io.*;
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import java.net.*;
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/**
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* Compacts HTML source by removing all unnecessary white space.
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* <p>
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* Use one of the following methods to obtain the output:
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* <ul>
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* <li>{@link #writeTo(Writer)}</li>
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* <li>{@link #appendTo(Appendable)}</li>
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* <li>{@link #toString()}</li>
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* <li>{@link CharStreamSourceUtil#getReader(CharStreamSource) CharStreamSourceUtil.getReader(this)}</li>
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* </ul>
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* <p>
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* The output text is functionally equivalent to the original source and should be rendered identically.
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* <p>
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* Compacting an entire {@link Source} object performs a {@linkplain Source#fullSequentialParse() full sequential parse} automatically.
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*/
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public final class SourceCompactor implements CharStreamSource {
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private final Segment segment;
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private String newLine=null;
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/**
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* Constructs a new <code>SourceCompactor</code> based on the specified {@link Segment}.
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* @param segment the segment containing the HTML to be compacted.
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*/
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public SourceCompactor(final Segment segment) {
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this.segment=segment;
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}
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// Documentation inherited from CharStreamSource
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public void writeTo(final Writer writer) throws IOException {
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appendTo(writer);
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writer.flush();
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}
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// Documentation inherited from CharStreamSource
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public void appendTo(final Appendable appendable) throws IOException {
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new SourceFormatter(segment).setTidyTags(true).setNewLine(newLine).setRemoveLineBreaks(true).appendTo(appendable);
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}
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// Documentation inherited from CharStreamSource
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public long getEstimatedMaximumOutputLength() {
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return segment.length();
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}
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// Documentation inherited from CharStreamSource
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public String toString() {
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return CharStreamSourceUtil.toString(this);
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}
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/**
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* Sets the string to be used to represent a <a target="_blank" href="http://en.wikipedia.org/wiki/Newline">newline</a> in the output.
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* <p>
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* The default is to use the same new line string as is used in the source document, which is determined via the {@link Source#getNewLine()} method.
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* If the source document does not contain any new lines, a "best guess" is made by either taking the new line string of a previously parsed document,
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* or using the value from the static {@link Config#NewLine} property.
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* <p>
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* Specifying a <code>null</code> argument resets the property to its default value, which is to use the same new line string as is used in the source document.
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*
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* @param newLine the string to be used to represent a <a target="_blank" href="http://en.wikipedia.org/wiki/Newline">newline</a> in the output, may be <code>null</code>.
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* @return this <code>SourceFormatter</code> instance, allowing multiple property setting methods to be chained in a single statement.
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* @see #getNewLine()
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*/
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public SourceCompactor setNewLine(final String newLine) {
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this.newLine=newLine;
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return this;
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}
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/**
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* Returns the string to be used to represent a <a target="_blank" href="http://en.wikipedia.org/wiki/Newline">newline</a> in the output.
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* <p>
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* See the {@link #setNewLine(String)} method for a full description of this property.
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*
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* @return the string to be used to represent a <a target="_blank" href="http://en.wikipedia.org/wiki/Newline">newline</a> in the output.
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*/
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public String getNewLine() {
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if (newLine==null) newLine=segment.source.getBestGuessNewLine();
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return newLine;
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}
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}
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