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/**
* IconEntry
* Copyright 2016 by luccioman; https://github.com/luccioman
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program in the file lgpl21.txt
* If not, see <http://www.gnu.org/licenses/>.
*/
package net.yacy.document.parser.html;
import java.awt.Dimension;
import java.util.HashSet;
import java.util.Set;
import java.util.regex.Pattern;
import net.yacy.cora.document.id.DigestURL;
/**
* Represents an icon in a document.
*
* @author luc
*
*/
public class IconEntry {
/** Patern to parse a HTML link sizes token attribute (ie. "16x16") */
public static final Pattern SIZE_PATTERN = Pattern.compile("([1-9][0-9]*)[xX]([1-9][0-9]*)");
/** Icon URL */
private final DigestURL url;
/**
* Icon links relations (one url may be used as multiple icon relations in
* the same document)
*/
private final Set<String> rel;
/** Icon sizes */
private final Set<Dimension> sizes;
/**
* Constructs instance from parameters.
*
* @param url
* must not be null.
* @param rel
* must not be null and contain at least one item.
* @param sizes
* optional.
*/
public IconEntry(final DigestURL url, Set<String> rel, Set<Dimension> sizes) {
if (url == null) {
throw new IllegalArgumentException("url must not be null.");
}
if (rel == null || rel.isEmpty()) {
throw new IllegalArgumentException("rel must be specified");
}
this.url = url;
this.rel = rel;
if (sizes != null) {
this.sizes = sizes;
} else {
this.sizes = new HashSet<>();
}
}
/**
* @return true when rel property contains a standard IANA registered icon
* link relation
*/
public boolean isStandardIcon() {
boolean standard = false;
for (String relation : this.rel) {
if (IconLinkRelations.isStandardIconRel(relation)) {
standard = true;
break;
}
}
return standard;
}
/**
* @param size1
* @param size2
* @return distance between two sizes, or Double.MAX_VALUE when one size is null
*/
public static double getDistance(Dimension size1, Dimension size2) {
double result = Double.MAX_VALUE;
if(size1 != null && size2 != null) {
result = (Math.abs(size1.width - size2.width) + Math.abs(size1.height - size2.height)) / 2.0;
}
return result;
}
/**
* @param preferredSize
* @return the size among sizes property which is the closest to
* preferredSize, or null when sizes is empty or preferredSize is null.
*/
public Dimension getClosestSize(Dimension preferredSize) {
Dimension closest = null;
if (preferredSize != null) {
double closestDistance = Double.MAX_VALUE;
for (Dimension size : this.sizes) {
double currentDistance = getDistance(size, preferredSize);
if (closest == null) {
closest = size;
closestDistance = currentDistance;
} else {
if (currentDistance < closestDistance) {
closest = size;
closestDistance = currentDistance;
}
}
}
}
return closest;
}
@Override
public String toString() {
StringBuilder res = new StringBuilder();
res.append("<link");
res.append(" href=\"").append(this.url.toNormalform(false)).append("\"");
res.append(" rel=\"");
res.append(relToString());
res.append("\"");
if (!this.sizes.isEmpty()) {
res.append(" sizes=\"");
res.append(sizesToString());
res.append("\"");
}
res.append(">");
return res.toString();
}
/**
* @return icon URL
*/
public DigestURL getUrl() {
return url;
}
/**
* @return icons link relations
*/
public Set<String> getRel() {
return rel;
}
/**
* @return icon eventual sizes
*/
public Set<Dimension> getSizes() {
return sizes;
}
/**
* @return a string representation of sizes property, in the form of a valid
* HTML link tag sizes attribute (e.g. "16x16 64x64")
*/
public String sizesToString() {
StringBuilder builder = new StringBuilder();
for (Dimension size : this.sizes) {
if (builder.length() > 0) {
builder.append(" ");
}
builder.append(size.width).append("x").append(size.height);
}
return builder.toString();
}
/**
* @return a string representation of rel property, int the form of a valid
* HTML link tag rel attribute (e.g. "icon apple-touch-icon")
*/
public String relToString() {
StringBuilder builder = new StringBuilder();
for (String relation : this.rel) {
if (builder.length() > 0) {
builder.append(" ");
}
builder.append(relation);
}
return builder.toString();
}
}
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