/*
* Kodkod -- Copyright (c) 2005-present, Emina Torlak
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package kodkod.ast;
import java.util.Arrays;
import java.util.Iterator;
import kodkod.ast.visitor.ReturnVisitor;
import kodkod.ast.visitor.VoidVisitor;
import kodkod.util.collections.Containers;
/**
* A sequence of decls.
*
* @specfield size: int
* @specfield decls: [0..size) -> one Decl
* @invariant size > 0
* @invariant children = decls
* @author Emina Torlak
*/
public class Decls extends Node implements Iterable<Decl> {
private final Decl[] decls;
/**
* Constructs a Decls object with itself as its sole
* declaration. This constructor can only be called
* from inside the Decl constructor; otherwise it will
* throw a ClassCastException.
* @ensures this.declarations' = 0->this
* @throws ClassCastException this !in Decl
*/
Decls() {
this.decls = new Decl[]{ (Decl) this };
}
/**
* Constructs a new Decls with the specified head and tail.
* @requires head.size > 0 && tail.size > 0
* @ensures this.size' = head.size + tail.size &&
* (all i: [0..head.size) | this.decls[i] = head.decls[i]) &&
* (all i: [head.size..this.size') | this.decls[i] = tail.decls[i])
* @throws NullPointerException head = null || tail is null
*/
private Decls(Decls head, Decls tail) {
this.decls = new Decl[head.size()+tail.size()];
System.arraycopy(head.decls, 0, decls, 0, head.size());
System.arraycopy(tail.decls, 0, decls, head.size(), tail.size());
}
/**
* Returns the number of decls in this Decls object.
* @return this.size
*/
public int size() { return decls.length; }
/**
* Returns the ith declaration in this Decls sequence.
* @requires 0 <= i < this.size
* @return this.decls[i]
*/
public Decl get(int i) { return decls[i]; }
/**
* Returns an unmodifiable iterator over the decls in this Decls object.
* @return an unmodifiable iterator over the decls in this Decls object.
*/
public Iterator<Decl> iterator() { return Containers.iterate(decls); }
/**
* Returns a sequence of this.size + other.size decls that has
* these decls as the prefix and the given decls as the suffix.
* @return {ds: Decls | ds.size = this.size + other.size &&
* ds.decls = this.decls +
* {i: [this.size..this.size+other.size), d: Decl | d = other.decls[i-this.size] }
* @throws NullPointerException decl = null
*/
public final Decls and(Decls other) {
return new Decls(this, other);
}
/**
* {@inheritDoc}
* @see kodkod.ast.Node#accept(kodkod.ast.visitor.ReturnVisitor)
*/
public <E, F, D, I> D accept(ReturnVisitor<E, F, D, I> visitor) {
return visitor.visit(this);
}
/**
* {@inheritDoc}
* @see kodkod.ast.Node#accept(kodkod.ast.visitor.VoidVisitor)
*/
public void accept(VoidVisitor visitor) {
visitor.visit(this);
}
/**
* {@inheritDoc}
* @see kodkod.ast.Node#toString()
*/
public String toString() {
return Arrays.toString(decls);
}
}