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Java example source code file (Node.java)
The Node.java Java example source code/* * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package jdk.nashorn.internal.ir; import java.util.ArrayList; import java.util.List; import jdk.nashorn.internal.codegen.types.Type; import jdk.nashorn.internal.ir.visitor.NodeVisitor; import jdk.nashorn.internal.parser.Token; import jdk.nashorn.internal.parser.TokenType; /** * Nodes are used to compose Abstract Syntax Trees. */ public abstract class Node implements Cloneable { /** Start of source range. */ protected final int start; /** End of source range. */ protected int finish; /** Token descriptor. */ private final long token; /** * Constructor * * @param token token * @param finish finish */ public Node(final long token, final int finish) { this.token = token; this.start = Token.descPosition(token); this.finish = finish; } /** * Constructor * * @param token token * @param start start * @param finish finish */ protected Node(final long token, final int start, final int finish) { this.start = start; this.finish = finish; this.token = token; } /** * Copy constructor * * @param node source node */ protected Node(final Node node) { this.token = node.token; this.start = node.start; this.finish = node.finish; } /** * Is this an atom node - for example a literal or an identity * * @return true if atom */ public boolean isAtom() { return false; } /** * Is this a loop node? * * @return true if atom */ public boolean isLoop() { return false; } /** * Is this an assignment node - for example a var node with an init * or a binary node that writes to a destination * * @return true if assignment */ public boolean isAssignment() { return false; } /** * Is this a self modifying assignment? * @return true if self modifying, e.g. a++, or a*= 17 */ public boolean isSelfModifying() { return false; } /** * Returns widest operation type of this operation. * * @return the widest type for this operation */ public Type getWidestOperationType() { return Type.OBJECT; } /** * Returns true if this node represents a comparison operator * @return true if comparison */ public boolean isComparison() { return false; } /** * For reference copies - ensure that labels in the copy node are unique * using an appropriate copy constructor * @param lc lexical context * @return new node or same of no labels */ public Node ensureUniqueLabels(final LexicalContext lc) { return this; } /** * Provides a means to navigate the IR. * @param visitor Node visitor. * @return node the node or its replacement after visitation, null if no further visitations are required */ public abstract Node accept(NodeVisitor<? extends LexicalContext> visitor); @Override public String toString() { final StringBuilder sb = new StringBuilder(); toString(sb); return sb.toString(); } /** * String conversion helper. Fills a {@link StringBuilder} with the * string version of this node * * @param sb a StringBuilder */ public abstract void toString(StringBuilder sb); /** * Check if this node has terminal flags, i.e. ends or breaks control flow * * @return true if terminal */ public boolean hasTerminalFlags() { return isTerminal() || hasGoto(); } /** * Get the finish position for this node in the source string * @return finish */ public int getFinish() { return finish; } /** * Set finish position for this node in the source string * @param finish finish */ public void setFinish(final int finish) { this.finish = finish; } /** * Check if this function repositions control flow with goto like * semantics, for example {@link BreakNode} or a {@link ForNode} with no test * @return true if node has goto semantics */ public boolean hasGoto() { return false; } /** * Get start position for node * @return start position */ public int getStart() { return start; } @Override protected Object clone() { try { return super.clone(); } catch (final CloneNotSupportedException e) { throw new AssertionError(e); } } @Override public final boolean equals(final Object other) { return super.equals(other); } @Override public final int hashCode() { return super.hashCode(); } /** * Return token position from a token descriptor. * * @return Start position of the token in the source. */ public int position() { return Token.descPosition(token); } /** * Return token length from a token descriptor. * * @return Length of the token. */ public int length() { return Token.descLength(token); } /** * Return token tokenType from a token descriptor. * * @return Type of token. */ public TokenType tokenType() { return Token.descType(token); } /** * Test token tokenType. * * @param type a type to check this token against * @return true if token types match. */ public boolean isTokenType(final TokenType type) { return Token.descType(token) == type; } /** * Get the token for this location * @return the token */ public long getToken() { return token; } /** * Is this a terminal Node, i.e. does it end control flow like a throw or return * expression does? * * @return true if this node is terminal */ public boolean isTerminal() { return false; } //on change, we have to replace the entire list, that's we can't simple do ListIterator.set static <T extends Node> List Other Java examples (source code examples)Here is a short list of links related to this Java Node.java source code file: |
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