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Groovy example source code file (EmptyBorderFactory.groovy)

This example Groovy source code file (EmptyBorderFactory.groovy) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Groovy tags/keywords

emptyborderfactory, gui, integer, integer, list, map, object, object, runtimeexception, runtimeexception, swing, swingborderfactory, when, when

The Groovy EmptyBorderFactory.groovy source code

/*
 * Copyright 2007 the original author or authors.
 *
 * Licensed 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.
 */
package groovy.swing.factory

import javax.swing.BorderFactory

/**
 * accepts values in lieu of attributes:
 *  int - all of top, left, bottom, right
 *  [int, int, int, int] - top, left, bottom, right
 * accepts attributes when no value present:
 *  top: int, left: int, bottom: int, right: int
 *
 */
class EmptyBorderFactory extends SwingBorderFactory {

    public Object newInstance(FactoryBuilderSupport builder, Object name, Object value, Map attributes) {
        builder.context.applyBorderToParent = attributes.remove('parent')
        
        if (!attributes) {
            if (value instanceof Integer) {
                return BorderFactory.createEmptyBorder(value, value, value, value)
            } else if (value instanceof List && value.size() == 4) {
                // we need GDK methods on Collection for boolean .any{} and boolean .all{} :(
                boolean ints = true
                value.each {ints = ints & it instanceof Integer}
                if (ints) {
                    return BorderFactory.createEmptyBorder(*value);
                }
            }
            throw new RuntimeException("$name only accepts a single integer or an array of four integers as a value argument");
        }
        if (value == null) {
            int top = attributes.remove("top")
            int left = attributes.remove("left")
            int bottom = attributes.remove("bottom")
            int right = attributes.remove("right")
            if ((top == null) || (top == null) || (top == null) || (top == null) || attributes) {
                throw new RuntimeException("When $name is called it must be call with top:, left:, bottom:, right:, and no other attributes")
            }
            return BorderFactory.createEmptyBorder(top, left, bottom, right);
        }
        throw new RuntimeException("$name cannot be called with both an argulent value and attributes")
    }

}

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