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Groovy example source code file (VariableExpression.java)

This example Groovy source code file (VariableExpression.java) 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

classnode, classnode, expression, string, string, super_expression, this_expression, variable, variable, variableexpression, variableexpression

The Groovy VariableExpression.java source code

/*
 * Copyright 2003-2007 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 org.codehaus.groovy.ast.expr;

import org.codehaus.groovy.ast.ClassHelper;
import org.codehaus.groovy.ast.ClassNode;
import org.codehaus.groovy.ast.GroovyCodeVisitor;
import org.codehaus.groovy.ast.Variable;

/**
 * Represents a local variable name, the simplest form of expression. e.g. "foo".
 * 
 * @author <a href="mailto:james@coredevelopers.net">James Strachan
 * @version $Revision: 21216 $
 */
public class VariableExpression extends Expression implements Variable {
    // The following fields are only used internally; every occurrence of a user-defined expression of the same kind
    // has its own instance so as to preserve line information. Consequently, to test for such an expression, don't
    // compare against the field but call isXXXExpression() instead.
    public static final VariableExpression THIS_EXPRESSION = new VariableExpression("this", ClassHelper.DYNAMIC_TYPE);
    public static final VariableExpression SUPER_EXPRESSION = new VariableExpression("super", ClassHelper.DYNAMIC_TYPE);

    private String variable;
    private int modifiers;
    private boolean inStaticContext;
    private boolean isDynamicTyped=false;
    private Variable accessedVariable;
    boolean closureShare=false;
    boolean useRef=false;
    private ClassNode originType;

    public Variable getAccessedVariable() {
        return accessedVariable;
    }

    public void setAccessedVariable(Variable origin) {
        this.accessedVariable = origin;
    }

    public VariableExpression(String variable, ClassNode type) {
        this.variable = variable;
        originType = type;
        setType(ClassHelper.getWrapper(type));
    }
    
    public VariableExpression(String variable) {
        this(variable, ClassHelper.DYNAMIC_TYPE);
    }
    
    public VariableExpression(Variable variable) {
        this(variable.getName(), variable.getOriginType());
        setAccessedVariable(variable);
        setModifiers(variable.getModifiers());
    }

    public void visit(GroovyCodeVisitor visitor) {
        visitor.visitVariableExpression(this);
    }

    public Expression transformExpression(ExpressionTransformer transformer) {
        return this;
    }

    public String getText() {
        return variable;
    }
    
    public String getName() {
        return variable;
    }

    public String toString() {
        return super.toString() + "[variable: " + variable + (this.isDynamicTyped() ? "" : " type: " + getType()) + "]";
    }

    public Expression getInitialExpression() {
        return null;
    }

    public boolean hasInitialExpression() {
        return false;
    }
    
    public boolean isInStaticContext() {
        if (accessedVariable!=null && accessedVariable!=this) return accessedVariable.isInStaticContext();
        return inStaticContext;
    }
    
    public void setInStaticContext(boolean inStaticContext) {
        this.inStaticContext = inStaticContext;
    }

    public void setType(ClassNode cn){
        super.setType(cn);
        isDynamicTyped |= ClassHelper.DYNAMIC_TYPE==cn;
    }
    
    public boolean isDynamicTyped() {
        if (accessedVariable!=null && accessedVariable!=this) return accessedVariable.isDynamicTyped();
        return isDynamicTyped;
    }

    public boolean isClosureSharedVariable() {
        if (accessedVariable!=null && accessedVariable!=this) return accessedVariable.isClosureSharedVariable();
        return closureShare;
    }
    
    public void setClosureSharedVariable(boolean inClosure) {
        closureShare = inClosure;        
    }

    public int getModifiers() {
        return modifiers;
    }

    public void setUseReferenceDirectly(boolean useRef) {
        this.useRef = useRef;        
    }
    
    public boolean isUseReferenceDirectly() {
        return useRef;
    }
    
    public ClassNode getType() {
        if (accessedVariable!=null && accessedVariable!=this) return accessedVariable.getType();
        return super.getType();
    }

    public ClassNode getOriginType() {
        if (accessedVariable!=null && accessedVariable!=this) return accessedVariable.getOriginType();
        return originType;
    }

    public boolean isThisExpression() {
        return "this".equals(variable);
    }

    public boolean isSuperExpression() {
        return "super".equals(variable);
    }

    public void setModifiers(int modifiers) {
        this.modifiers = modifiers;
    }
}

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