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- /*
- * 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.
- */
-
- /* $Id$ */
-
- package org.apache.fop.afp.ptoca;
-
- import java.io.IOException;
- import java.io.OutputStream;
- import java.util.ArrayList;
- import java.util.Collections;
- import java.util.Iterator;
- import java.util.List;
-
- import org.apache.fop.afp.fonts.CharactersetEncoder.EncodedChars;
- import org.apache.fop.afp.ptoca.TransparentDataControlSequence.TransparentData;
-
- import static org.apache.fop.afp.ptoca.PtocaConstants.TRANSPARENT_DATA_MAX_SIZE;
-
- /**
- * This object represents a series of PTOCA TransparentData (TRN) control sequences. This implements
- * {@link Iterable} to enable iteration through the TRNs.
- */
- final class TransparentDataControlSequence implements Iterable<TransparentData> {
-
- private static final int MAX_SBCS_TRN_SIZE = TRANSPARENT_DATA_MAX_SIZE;
- // The maximum size of a TRN must be an EVEN number so that we're splitting TRNs on character
- // boundaries rather than in the middle of a double-byte character
- private static final int MAX_DBCS_TRN_SIZE = MAX_SBCS_TRN_SIZE - 1;
-
- static final class TransparentData {
- private final int offset;
- private final int length;
- private final EncodedChars encodedChars;
-
- private TransparentData(int offset, int length, EncodedChars encChars) {
- this.offset = offset;
- this.length = length;
- this.encodedChars = encChars;
- }
-
- void writeTo(OutputStream outStream) throws IOException {
- encodedChars.writeTo(outStream, offset, length);
- }
- }
-
- private final List<TransparentData> trns;
-
- /**
- * Converts an encoded String wrapped in an {@link EncodedChars} into a series of
- * {@link TransparentData} control sequences.
- *
- * @param encChars the encoded characters to convert to TRNs
- */
- public TransparentDataControlSequence(EncodedChars encChars) {
- int maxTrnLength = encChars.isDBCS() ? MAX_DBCS_TRN_SIZE : MAX_SBCS_TRN_SIZE;
- int numTransData = encChars.getLength() / maxTrnLength;
- int currIndex = 0;
- List<TransparentData> trns = new ArrayList<TransparentData>();
- for (int transDataCnt = 0; transDataCnt < numTransData; transDataCnt++) {
- trns.add(new TransparentData(currIndex, maxTrnLength, encChars));
- currIndex += maxTrnLength;
- }
- int left = encChars.getLength() - currIndex;
- trns.add(new TransparentData(currIndex, left, encChars));
- this.trns = Collections.unmodifiableList(trns);
- }
-
- /**
- * The {@link Iterator} for retrieving the series of TRN control sequences.
- */
- public Iterator<TransparentData> iterator() {
- return trns.iterator();
- }
- }
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