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Groovy: A powerful, dynamic language for the JVM
/*
* 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.
*/
package org.codehaus.groovy.ast;
import org.codehaus.groovy.GroovyBugError;
import org.codehaus.groovy.util.ListHashMap;
import java.util.Collections;
import java.util.Map;
/**
* Base class for any AST node. This class supports basic information used in all nodes of the AST:
*
* - line and column number information. Usually a node represents a certain
* area in a text file determined by a starting position and an ending position.
* For nodes that do not represent this, this information will be -1. A node can
* also be configured in its line/col information using another node through
* setSourcePosition(otherNode).
* - every node can store meta data. A phase operation or transform can use
* this to transport arbitrary information to another phase operation or
* transform. The only requirement is that the other phase operation or transform
* runs after the part storing the information. If the information transport is
* done it is strongly recommended to remove that meta data.
* - a text representation of this node trough getText(). This was in the
* past used for assertion messages. Since the usage of power asserts this
* method will not be called for this purpose anymore and might be removed in
* future versions of Groovy
*
*
* @author James Strachan
* @author Jochen "blackdrag" Theodorou
*/
public class ASTNode {
private int lineNumber = -1;
private int columnNumber = -1;
private int lastLineNumber = -1;
private int lastColumnNumber = -1;
private ListHashMap metaDataMap = null;
public void visit(GroovyCodeVisitor visitor) {
throw new RuntimeException("No visit() method implemented for class: " + getClass().getName());
}
public String getText() {
return "";
}
public int getLineNumber() {
return lineNumber;
}
public void setLineNumber(int lineNumber) {
this.lineNumber = lineNumber;
}
public int getColumnNumber() {
return columnNumber;
}
public void setColumnNumber(int columnNumber) {
this.columnNumber = columnNumber;
}
public int getLastLineNumber() {
return lastLineNumber;
}
public void setLastLineNumber(int lastLineNumber) {
this.lastLineNumber = lastLineNumber;
}
public int getLastColumnNumber() {
return lastColumnNumber;
}
public void setLastColumnNumber(int lastColumnNumber) {
this.lastColumnNumber = lastColumnNumber;
}
/**
* Sets the source position using another ASTNode.
* The sourcePosition consists of a line/column pair for
* the start and a line/column pair for the end of the
* expression or statement
*
* @param node - the node used to configure the position information
*/
public void setSourcePosition(ASTNode node) {
this.columnNumber = node.getColumnNumber();
this.lastLineNumber = node.getLastLineNumber();
this.lastColumnNumber = node.getLastColumnNumber();
this.lineNumber = node.getLineNumber();
}
/**
* Gets the node meta data.
*
* @param key - the meta data key
* @return the node meta data value for this key
*/
public T getNodeMetaData(Object key) {
if (metaDataMap == null) {
return (T) null;
}
return (T) metaDataMap.get(key);
}
/**
* Copies all node meta data from the other node to this one
* @param other - the other node
*/
public void copyNodeMetaData(ASTNode other) {
if (other.metaDataMap == null) {
return;
}
if (metaDataMap == null) {
metaDataMap = new ListHashMap();
}
metaDataMap.putAll(other.metaDataMap);
}
/**
* Sets the node meta data.
*
* @param key - the meta data key
* @param value - the meta data value
* @throws GroovyBugError if key is null or there is already meta
* data under that key
*/
public void setNodeMetaData(Object key, Object value) {
if (key==null) throw new GroovyBugError("Tried to set meta data with null key on "+this+".");
if (metaDataMap == null) {
metaDataMap = new ListHashMap();
}
Object old = metaDataMap.put(key,value);
if (old!=null) throw new GroovyBugError("Tried to overwrite existing meta data "+this+".");
}
/**
* Sets the node meta data but allows overwriting values.
*
* @param key - the meta data key
* @param value - the meta data value
* @return the old node meta data value for this key
* @throws GroovyBugError if key is null
*/
public Object putNodeMetaData(Object key, Object value) {
if (key == null) throw new GroovyBugError("Tried to set meta data with null key on " + this + ".");
if (metaDataMap == null) {
metaDataMap = new ListHashMap();
}
return metaDataMap.put(key, value);
}
/**
* Removes a node meta data entry.
*
* @param key - the meta data key
* @throws GroovyBugError if the key is null
*/
public void removeNodeMetaData(Object key) {
if (key==null) throw new GroovyBugError("Tried to remove meta data with null key "+this+".");
if (metaDataMap == null) {
return;
}
metaDataMap.remove(key);
}
/**
* Returns an unmodifiable view of the current node metadata.
* @return the node metadata. Always not null.
*/
public Map getNodeMetaData() {
if (metaDataMap==null) {
return Collections.emptyMap();
}
return Collections.unmodifiableMap(metaDataMap);
}
}