groovy.lang.Range Maven / Gradle / Ivy
/*
* Copyright 2003-2008 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.lang;
import java.util.List;
/**
* A Range represents the list of all items obtained by starting from a
* from value and calling next() successively
* until you reach the to value. For a reverse range,
* the list is obtained by starting at the to value and
* successively calling previous() until the from
* value is reached.
*
* @author James Strachan
* @version $Revision$
*/
public interface Range extends List {
/**
* The lower value in the range.
*
* @return the lower value in the range.
*/
T getFrom();
/**
* The upper value in the range.
*
* @return the upper value in the range
*/
T getTo();
/**
* Indicates whether this is a reverse range which iterates backwards
* starting from the to value and ending on the from value
*
* @return true if this is a reverse range
*/
boolean isReverse();
/**
* Indicates whether an object is greater than or equal to the from
* value for the range and less than or equal to the to value.
*
* @param o the object to check against the boundaries of the range
* @return true if the object is between the from and to values
*/
boolean containsWithinBounds(Object o);
/**
* Steps through the range, calling a closure for each number.
*
* @param step the amount by which to step. If negative, steps through the
* range backwards.
* @param closure the {@link Closure} to call
*/
void step(int step, Closure closure);
/**
* Forms a list by stepping through the range by the indicated interval.
*
* @param step the amount by which to step. If negative, steps through the
* range backwards.
* @return the list formed by stepping through the range by the indicated
* interval.
*/
List step(int step);
/**
* @return the verbose {@link String} representation of this {@link Range} as would be typed into a console
* to create the {@link Range} instance
*/
String inspect();
}