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Tag.java
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155 lines (136 loc) · 3.94 KB
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/*
* Copyright 2010, 2011, 2012 mapsforge.org
*
* This program 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 3 of the License, or (at your option) any later version.
*
* This program 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. If not, see <http://www.gnu.org/licenses/>.
*/
package org.mapsforge.core;
/**
* A tag represents an immutable key-value pair.
*/
public class Tag {
private static final char KEY_VALUE_SEPARATOR = '=';
/**
* The key of the house number OpenStreetMap tag.
*/
public static final String TAG_KEY_HOUSE_NUMBER = "addr:housenumber";
/**
* The key of the name OpenStreetMap tag.
*/
public static final String TAG_KEY_NAME = "name";
/**
* The key of the reference OpenStreetMap tag.
*/
public static final String TAG_KEY_REF = "ref";
/**
* The key of the elevation OpenStreetMap tag.
*/
public static final String TAG_KEY_ELE = "ele";
/**
* The key of this tag.
*/
public final String key;
/**
* The value of this tag.
*/
public String value;
private transient int hashCodeValue;
/**
* @param tag
* the textual representation of the tag.
*/
public Tag(String tag) {
int splitPosition = tag.indexOf(KEY_VALUE_SEPARATOR);
if (splitPosition < 0) {
System.out.println("TAG:" + tag);
}
this.key = tag.substring(0, splitPosition).intern();
this.value = tag.substring(splitPosition + 1).intern();
this.hashCodeValue = calculateHashCode();
}
public Tag(String tag, boolean hashValue) {
int splitPosition = tag.indexOf(KEY_VALUE_SEPARATOR);
if (splitPosition < 0) {
System.out.println("TAG:" + tag);
}
this.key = tag.substring(0, splitPosition).intern();
if (!hashValue)
this.value = tag.substring(splitPosition + 1);
else
this.value = tag.substring(splitPosition + 1).intern();
this.hashCodeValue = calculateHashCode();
}
/**
* @param key
* the key of the tag.
* @param value
* the value of the tag.
*/
public Tag(String key, String value) {
this.key = (key == null ? null : key.intern());
this.value = (value == null ? null : value.intern());
this.hashCodeValue = calculateHashCode();
}
/**
* @param key
* the key of the tag.
* @param value
* the value of the tag.
* @param intern
* true when string should be intern()alized.
*/
public Tag(String key, String value, boolean intern) {
if (intern) {
this.key = (key == null ? null : key.intern());
this.value = (value == null ? null : value.intern());
}
else {
this.key = (key == null ? null : key);
this.value = (value == null ? null : value);
}
this.hashCodeValue = calculateHashCode();
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
} else if (!(obj instanceof Tag)) {
return false;
}
Tag other = (Tag) obj;
if ((this.key != other.key) || (this.value != other.value))
return false;
return true;
}
@Override
public int hashCode() {
return this.hashCodeValue;
}
@Override
public String toString() {
StringBuilder stringBuilder = new StringBuilder();
stringBuilder.append("Tag [key=");
stringBuilder.append(this.key);
stringBuilder.append(", value=");
stringBuilder.append(this.value);
stringBuilder.append("]");
return stringBuilder.toString();
}
/**
* @return the hash code of this object.
*/
private int calculateHashCode() {
int result = 7;
result = 31 * result + ((this.key == null) ? 0 : this.key.hashCode());
result = 31 * result + ((this.value == null) ? 0 : this.value.hashCode());
return result;
}
}