org.jactr.eclipse.runtime.debug.elements.ASTVariable.java Source code

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Here is the source code for org.jactr.eclipse.runtime.debug.elements.ASTVariable.java

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/*
 * Created on Mar 18, 2007 Copyright (C) 2001-5, Anthony Harrison anh23@pitt.edu
 * (jactr.org) This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of the License,
 * or (at your option) any later version. This library 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 Lesser General Public License for more details. You should have
 * received a copy of the GNU Lesser General Public License along with this
 * library; if not, write to the Free Software Foundation, Inc., 59 Temple
 * Place, Suite 330, Boston, MA 02111-1307 USA
 */
package org.jactr.eclipse.runtime.debug.elements;

import java.lang.ref.SoftReference;
import java.util.ArrayList;

import org.antlr.runtime.tree.CommonTree;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.eclipse.debug.core.DebugException;
import org.eclipse.debug.core.model.IValue;
import org.eclipse.debug.core.model.IVariable;
import org.jactr.eclipse.core.ast.Support;
import org.jactr.eclipse.runtime.debug.ACTRDebugTarget;
import org.jactr.io.antlr3.builder.JACTRBuilder;

public class ASTVariable extends ACTRDebugElement implements IVariable, IValue {

    /**
     * Logger definition
     */

    static private final transient Log LOGGER = LogFactory.getLog(ASTVariable.class);

    private final CommonTree _ast;

    private String _variableName;

    private String _variableType;

    private String _variableValue;

    private SoftReference<IVariable[]> _children = new SoftReference<IVariable[]>(null);

    public ASTVariable(CommonTree ast, ACTRDebugTarget target) {
        setDebugTarget(target);
        _ast = ast;
        extractDisplayTexts();

        if (_ast == null)
            LOGGER.error("NULL AST?", new NullPointerException());

        if (LOGGER.isDebugEnabled())
            LOGGER.debug("Variable created " + _variableName + " ");
    }

    public ASTVariable(CommonTree ast, String variableValue, ACTRDebugTarget target) {
        this(ast, target);
        setVariableValue(variableValue);
    }

    public CommonTree getCommonTree() {
        return _ast;
    }

    public void setReferenceTypeName(String variableType) {
        _variableType = variableType;
    }

    public void setName(String name) {
        _variableName = name;
    }

    public void setVariableValue(String value) {
        _variableValue = value;
    }

    public String getName() throws DebugException {
        return _variableName;
    }

    public String getReferenceTypeName() throws DebugException {
        return _variableType;
    }

    public IValue getValue() throws DebugException {
        return this;
    }

    public boolean hasValueChanged() throws DebugException {
        return false;
    }

    public void setValue(String expression) throws DebugException {

    }

    public void setValue(IValue value) throws DebugException {

    }

    public boolean supportsValueModification() {
        return false;
    }

    public boolean verifyValue(String expression) throws DebugException {
        return false;
    }

    public boolean verifyValue(IValue value) throws DebugException {
        return false;
    }

    public String getValueString() throws DebugException {
        return _variableValue;
    }

    public IVariable[] getVariables() throws DebugException {
        IVariable[] children = _children.get();
        if (children == null) {
            ArrayList<IVariable> variables = new ArrayList<IVariable>();
            for (CommonTree child : Support.getVisibleChildren(_ast))
                variables.add(new ASTVariable(child, _target));

            children = variables.toArray(new IVariable[variables.size()]);
            _children = new SoftReference<IVariable[]>(children);
        }

        return children;
    }

    public boolean hasVariables() throws DebugException {
        return getVariables().length != 0;
    }

    public boolean isAllocated() throws DebugException {
        return true;
    }

    /**
     * we actually rely upon the ACTRModelPresentation to display the icon, and
     * name we just need to set the variable value
     */
    protected void extractDisplayTexts() {

        String name = _ast.getText();

        String tokenType = "[" + JACTRBuilder.tokenNames[_ast.getType()].toLowerCase() + "]";
        setReferenceTypeName(tokenType);

        CommonTree nameNode = null;
        for (int i = 0; i < _ast.getChildCount() && nameNode == null; i++) {
            nameNode = (CommonTree) _ast.getChild(i);
            if (nameNode.getType() != JACTRBuilder.NAME)
                nameNode = null;
        }

        int type = _ast.getType();

        if (nameNode != null)
            name = nameNode.getText();

        setName(name);

        switch (type) {

        case JACTRBuilder.SLOT:
            setVariableValue(_ast.getChild(2).getText());
            break;
        case JACTRBuilder.PARAMETER:
            setVariableValue(_ast.getChild(1).getText());
            break;
        default:
            break;
        }

    }
}