| /* |
| * 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.jackrabbit.vault.util.diff; |
| |
| import java.io.BufferedReader; |
| import java.io.IOException; |
| import java.io.Reader; |
| import java.io.StringReader; |
| import java.util.ArrayList; |
| |
| /** |
| * Implements an element factory that creates the elements out from words of |
| * the given input stream. |
| */ |
| public class WordsElementsFactory implements ElementsFactory { |
| |
| private static final int MAX_ELEMENTS = 100000; |
| |
| private final Document.Element[] elements; |
| |
| public WordsElementsFactory(Document.Element[] elements) { |
| this.elements = elements; |
| } |
| |
| public Document.Element[] getElements() { |
| return elements; |
| } |
| |
| public static WordsElementsFactory create(DocumentSource source, String text) { |
| try { |
| Reader reader = new StringReader(text); |
| return create(source, reader); |
| } catch (IOException e) { |
| throw new IllegalArgumentException(e.toString()); |
| } |
| } |
| |
| public static WordsElementsFactory create(DocumentSource source, Reader text) |
| throws IOException { |
| Document.Element[] elements = getElements(source, text); |
| return new WordsElementsFactory(elements); |
| } |
| |
| private static Document.Element[] getElements(DocumentSource source, Reader text) |
| throws IOException { |
| BufferedReader r; |
| if (text instanceof BufferedReader) { |
| r = (BufferedReader) text; |
| } else { |
| r = new BufferedReader(text); |
| } |
| ArrayList lines = new ArrayList(); |
| StringBuffer gutter = new StringBuffer(); |
| StringBuffer word = new StringBuffer(); |
| int c; |
| while ((c=r.read()) >=0 && lines.size()<MAX_ELEMENTS) { |
| if (Character.isLetterOrDigit((char) c)) { |
| if (gutter.length() > 0) { |
| lines.add(new WordElement(source, word.toString(), gutter.toString())); |
| gutter.setLength(0); |
| word.setLength(0); |
| } |
| word.append((char) c); |
| } else { |
| gutter.append((char) c); |
| } |
| } |
| if (word.length() > 0) { |
| lines.add(new WordElement(source, word.toString(), gutter.toString())); |
| } |
| return (WordElement[]) lines.toArray(new WordElement[lines.size()]); |
| } |
| |
| public static class WordElement implements Document.Element { |
| |
| private final DocumentSource source; |
| |
| private final String word; |
| |
| private final String gutter; |
| |
| public WordElement(DocumentSource source, String word, String gutter) { |
| this.source = source; |
| this.word = word; |
| this.gutter = gutter; |
| } |
| |
| public String getString() { |
| return word + gutter; |
| } |
| |
| public DocumentSource getDocumentSource() { |
| return source; |
| } |
| |
| public int hashCode() { |
| return word.hashCode(); |
| } |
| |
| public String toString() { |
| return getString(); |
| } |
| |
| public boolean equals(Object obj) { |
| if (obj == this) { |
| return true; |
| } |
| if (obj instanceof WordElement) { |
| return ((WordElement) obj).word.equals(word); |
| } |
| return false; |
| } |
| } |
| } |