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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.traits;
import java.io.ObjectStreamException;
import org.apache.fop.fo.Constants;
/**
* Enumeration class for direction traits, namely {inline,block}-progression-direction
* and shift-direction.
*/
public final class Direction extends TraitEnum {
private static final long serialVersionUID = 1L;
private static final String[] DIRECTION_NAMES = new String[]
{"lr", "rl", "tb", "bt"};
private static final int[] DIRECTION_VALUES = new int[]
{Constants.EN_LR, Constants.EN_RL, Constants.EN_TB, Constants.EN_BT};
/** direction: left-to-right */
public static final Direction LR = new Direction(0);
/** direction: right-to-left */
public static final Direction RL = new Direction(1);
/** direction: top-to-bottom */
public static final Direction TB = new Direction(2);
/** direction: bottom-to-top */
public static final Direction BT = new Direction(3);
private static final Direction[] DIRECTIONS = new Direction[] {LR, RL, TB, BT};
private Direction(int index) {
super(DIRECTION_NAMES[index], DIRECTION_VALUES[index]);
}
/**
* Determine if direction is vertical or not.
* @return true if vertical
*/
public boolean isVertical() {
return (getEnumValue() == Constants.EN_TB) || (getEnumValue() == Constants.EN_BT);
}
/**
* Determine if direction is horizontal or not.
* @return true if horizontal
*/
public boolean isHorizontal() {
return (getEnumValue() == Constants.EN_LR) || (getEnumValue() == Constants.EN_RL);
}
/**
* Returns the enumeration/singleton object based on its name.
* @param name the name of the enumeration value
* @return the enumeration object
*/
public static Direction valueOf(String name) {
for (int i = 0; i < DIRECTIONS.length; i++) {
if (DIRECTIONS[i].getName().equalsIgnoreCase(name)) {
return DIRECTIONS[i];
}
}
throw new IllegalArgumentException("Illegal direction: " + name);
}
/**
* Returns the enumeration/singleton object based on its name.
* @param enumValue the enumeration value
* @return the enumeration object
*/
public static Direction valueOf(int enumValue) {
for (int i = 0; i < DIRECTIONS.length; i++) {
if (DIRECTIONS[i].getEnumValue() == enumValue) {
return DIRECTIONS[i];
}
}
throw new IllegalArgumentException("Illegal direction: " + enumValue);
}
private Object readResolve() throws ObjectStreamException {
return valueOf(getName());
}
/** {@inheritDoc} */
public String toString() {
return getName();
}
}
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