| /* |
| * 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.lucene.analysis.icu.segmentation; |
| |
| import com.ibm.icu.lang.UCharacter; |
| import com.ibm.icu.lang.UProperty; |
| import com.ibm.icu.lang.UScript; |
| import com.ibm.icu.text.BreakIterator; |
| |
| /** |
| * An internal BreakIterator for multilingual text, following recommendations from: UAX #29: Unicode |
| * Text Segmentation. (http://unicode.org/reports/tr29/) |
| * |
| * <p>See http://unicode.org/reports/tr29/#Tailoring for the motivation of this design. |
| * |
| * <p>Text is first divided into script boundaries. The processing is then delegated to the |
| * appropriate break iterator for that specific script. |
| * |
| * <p>This break iterator also allows you to retrieve the ISO 15924 script code associated with a |
| * piece of text. |
| * |
| * <p>See also UAX #29, UTR #24 |
| * |
| * @lucene.experimental |
| */ |
| final class CompositeBreakIterator { |
| private final ICUTokenizerConfig config; |
| private final BreakIteratorWrapper wordBreakers[] = |
| new BreakIteratorWrapper[1 + UCharacter.getIntPropertyMaxValue(UProperty.SCRIPT)]; |
| |
| private BreakIteratorWrapper rbbi; |
| private final ScriptIterator scriptIterator; |
| |
| private char text[]; |
| |
| CompositeBreakIterator(ICUTokenizerConfig config) { |
| this.config = config; |
| this.scriptIterator = new ScriptIterator(config.combineCJ()); |
| } |
| |
| /** |
| * Retrieve the next break position. If the RBBI range is exhausted within the script boundary, |
| * examine the next script boundary. |
| * |
| * @return the next break position or BreakIterator.DONE |
| */ |
| int next() { |
| int next = rbbi.next(); |
| while (next == BreakIterator.DONE && scriptIterator.next()) { |
| rbbi = getBreakIterator(scriptIterator.getScriptCode()); |
| rbbi.setText( |
| text, |
| scriptIterator.getScriptStart(), |
| scriptIterator.getScriptLimit() - scriptIterator.getScriptStart()); |
| next = rbbi.next(); |
| } |
| return (next == BreakIterator.DONE) |
| ? BreakIterator.DONE |
| : next + scriptIterator.getScriptStart(); |
| } |
| |
| /** |
| * Retrieve the current break position. |
| * |
| * @return the current break position or BreakIterator.DONE |
| */ |
| int current() { |
| final int current = rbbi.current(); |
| return (current == BreakIterator.DONE) |
| ? BreakIterator.DONE |
| : current + scriptIterator.getScriptStart(); |
| } |
| |
| /** |
| * Retrieve the rule status code (token type) from the underlying break iterator |
| * |
| * @return rule status code (see RuleBasedBreakIterator constants) |
| */ |
| int getRuleStatus() { |
| return rbbi.getRuleStatus(); |
| } |
| |
| /** |
| * Retrieve the UScript script code for the current token. This code can be decoded with UScript |
| * into a name or ISO 15924 code. |
| * |
| * @return UScript script code for the current token. |
| */ |
| int getScriptCode() { |
| return scriptIterator.getScriptCode(); |
| } |
| |
| /** |
| * Set a new region of text to be examined by this iterator |
| * |
| * @param text buffer of text |
| * @param start offset into buffer |
| * @param length maximum length to examine |
| */ |
| void setText(final char text[], int start, int length) { |
| this.text = text; |
| scriptIterator.setText(text, start, length); |
| if (scriptIterator.next()) { |
| rbbi = getBreakIterator(scriptIterator.getScriptCode()); |
| rbbi.setText( |
| text, |
| scriptIterator.getScriptStart(), |
| scriptIterator.getScriptLimit() - scriptIterator.getScriptStart()); |
| } else { |
| rbbi = getBreakIterator(UScript.COMMON); |
| rbbi.setText(text, 0, 0); |
| } |
| } |
| |
| private BreakIteratorWrapper getBreakIterator(int scriptCode) { |
| if (wordBreakers[scriptCode] == null) |
| wordBreakers[scriptCode] = new BreakIteratorWrapper(config.getBreakIterator(scriptCode)); |
| return wordBreakers[scriptCode]; |
| } |
| } |