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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.complexscripts.fonts;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
// CSOFF: LineLengthCheck
// CSOFF: InnerAssignmentCheck
// CSOFF: NoWhitespaceAfterCheck
/**
* <p>.Base class implementation of glyph coverage table.</p>
*
* <p>This work was originally authored by Glenn Adams (gadams@apache.org).</p>
*/
public final class GlyphCoverageTable extends GlyphMappingTable implements GlyphCoverageMapping {
/* logging instance */
private static final Log log = LogFactory.getLog(GlyphCoverageTable.class); // CSOK: ConstantNameCheck
/** empty mapping table */
public static final int GLYPH_COVERAGE_TYPE_EMPTY = GLYPH_MAPPING_TYPE_EMPTY;
/** mapped mapping table */
public static final int GLYPH_COVERAGE_TYPE_MAPPED = GLYPH_MAPPING_TYPE_MAPPED;
/** range based mapping table */
public static final int GLYPH_COVERAGE_TYPE_RANGE = GLYPH_MAPPING_TYPE_RANGE;
private GlyphCoverageMapping cm;
private GlyphCoverageTable ( GlyphCoverageMapping cm ) {
assert cm != null;
assert cm instanceof GlyphMappingTable;
this.cm = cm;
}
/** {@inheritDoc} */
public int getType() {
return ( (GlyphMappingTable) cm ) .getType();
}
/** {@inheritDoc} */
public List getEntries() {
return ( (GlyphMappingTable) cm ) .getEntries();
}
/** {@inheritDoc} */
public int getCoverageSize() {
return cm.getCoverageSize();
}
/** {@inheritDoc} */
public int getCoverageIndex ( int gid ) {
return cm.getCoverageIndex ( gid );
}
/**
* Create glyph coverage table.
* @param entries list of mapped or ranged coverage entries, or null or empty list
* @return a new covera table instance
*/
public static GlyphCoverageTable createCoverageTable ( List entries ) {
GlyphCoverageMapping cm;
if ( ( entries == null ) || ( entries.size() == 0 ) ) {
cm = new EmptyCoverageTable ( entries );
} else if ( isMappedCoverage ( entries ) ) {
cm = new MappedCoverageTable ( entries );
} else if ( isRangeCoverage ( entries ) ) {
cm = new RangeCoverageTable ( entries );
} else {
cm = null;
}
assert cm != null : "unknown coverage type";
return new GlyphCoverageTable ( cm );
}
private static boolean isMappedCoverage ( List entries ) {
if ( ( entries == null ) || ( entries.size() == 0 ) ) {
return false;
} else {
for ( Iterator it = entries.iterator(); it.hasNext();) {
Object o = it.next();
if ( ! ( o instanceof Integer ) ) {
return false;
}
}
return true;
}
}
private static boolean isRangeCoverage ( List entries ) {
if ( ( entries == null ) || ( entries.size() == 0 ) ) {
return false;
} else {
for ( Iterator it = entries.iterator(); it.hasNext();) {
Object o = it.next();
if ( ! ( o instanceof MappingRange ) ) {
return false;
}
}
return true;
}
}
private static class EmptyCoverageTable extends GlyphMappingTable.EmptyMappingTable implements GlyphCoverageMapping {
public EmptyCoverageTable ( List entries ) {
super ( entries );
}
/** {@inheritDoc} */
public int getCoverageSize() {
return 0;
}
/** {@inheritDoc} */
public int getCoverageIndex ( int gid ) {
return -1;
}
}
private static class MappedCoverageTable extends GlyphMappingTable.MappedMappingTable implements GlyphCoverageMapping {
private int[] map;
public MappedCoverageTable ( List entries ) {
populate ( entries );
}
/** {@inheritDoc} */
public List getEntries() {
List entries = new java.util.ArrayList();
if ( map != null ) {
for ( int i = 0, n = map.length; i < n; i++ ) {
entries.add ( Integer.valueOf ( map [ i ] ) );
}
}
return entries;
}
/** {@inheritDoc} */
public int getMappingSize() {
return ( map != null ) ? map.length : 0;
}
public int getMappedIndex ( int gid ) {
int i;
if ( ( i = Arrays.binarySearch ( map, gid ) ) >= 0 ) {
return i;
} else {
return -1;
}
}
/** {@inheritDoc} */
public int getCoverageSize() {
return getMappingSize();
}
/** {@inheritDoc} */
public int getCoverageIndex ( int gid ) {
return getMappedIndex ( gid );
}
private void populate ( List entries ) {
int i = 0;
int n = entries.size();
int gidMax = -1;
int[] map = new int [ n ];
for ( Iterator it = entries.iterator(); it.hasNext();) {
Object o = it.next();
if ( o instanceof Integer ) {
int gid = ( (Integer) o ) . intValue();
if ( ( gid >= 0 ) && ( gid < 65536 ) ) {
if ( gid > gidMax ) {
map [ i++ ] = gidMax = gid;
} else {
log.info ( "ignoring out of order or duplicate glyph index: " + gid );
}
} else {
throw new AdvancedTypographicTableFormatException ( "illegal glyph index: " + gid );
}
} else {
throw new AdvancedTypographicTableFormatException ( "illegal coverage entry, must be Integer: " + o );
}
}
assert i == n;
assert this.map == null;
this.map = map;
}
/** {@inheritDoc} */
public String toString() {
StringBuffer sb = new StringBuffer();
sb.append('{');
for ( int i = 0, n = map.length; i < n; i++ ) {
if ( i > 0 ) {
sb.append(',');
}
sb.append ( Integer.toString ( map [ i ] ) );
}
sb.append('}');
return sb.toString();
}
}
private static class RangeCoverageTable extends GlyphMappingTable.RangeMappingTable implements GlyphCoverageMapping {
public RangeCoverageTable ( List entries ) {
super ( entries );
}
/** {@inheritDoc} */
public int getMappedIndex ( int gid, int s, int m ) {
return m + gid - s;
}
/** {@inheritDoc} */
public int getCoverageSize() {
return getMappingSize();
}
/** {@inheritDoc} */
public int getCoverageIndex ( int gid ) {
return getMappedIndex ( gid );
}
}
}
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