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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 (Direction direction : DIRECTIONS) {
- if (direction.getName().equalsIgnoreCase(name)) {
- return direction;
- }
- }
- 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 (Direction direction : DIRECTIONS) {
- if (direction.getEnumValue() == enumValue) {
- return direction;
- }
- }
- throw new IllegalArgumentException("Illegal direction: " + enumValue);
- }
-
- private Object readResolve() throws ObjectStreamException {
- return valueOf(getName());
- }
-
- /** {@inheritDoc} */
- public String toString() {
- return getName();
- }
-
- }
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