org.eclipse.cdt.dsf.debug.internal.ui.disassembly.OpcodeRulerColumn.java Source code

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Here is the source code for org.eclipse.cdt.dsf.debug.internal.ui.disassembly.OpcodeRulerColumn.java

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/*******************************************************************************
 * Copyright (c) 2011 Wind River Systems and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Wind River Systems - initial API and implementation
 *******************************************************************************/
package org.eclipse.cdt.dsf.debug.internal.ui.disassembly;

import org.eclipse.cdt.debug.internal.ui.disassembly.dsf.AddressRangePosition;
import org.eclipse.cdt.debug.internal.ui.disassembly.dsf.DisassemblyPosition;
import org.eclipse.cdt.dsf.debug.internal.ui.disassembly.model.DisassemblyDocument;
import org.eclipse.cdt.dsf.debug.internal.ui.disassembly.preferences.DisassemblyPreferenceConstants;
import org.eclipse.cdt.dsf.debug.internal.ui.disassembly.provisional.DisassemblyRulerColumn;
import org.eclipse.jface.preference.IPreferenceStore;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.util.PropertyChangeEvent;

/**
 * A vertical ruler column to display the opcodes of instructions.
 */
public class OpcodeRulerColumn extends DisassemblyRulerColumn {

    public static final String ID = "org.eclipse.cdt.dsf.ui.disassemblyColumn.opcode"; //$NON-NLS-1$

    private int fRadix;
    private String fRadixPrefix;

    /**
     * Default constructor.
     */
    public OpcodeRulerColumn() {
        super();
        setForeground(getColor(DisassemblyPreferenceConstants.CODE_BYTES_COLOR));
        setRadix(getPreferenceStore().getInt(DisassemblyPreferenceConstants.OPCODE_RADIX));
    }

    public void setRadix(int radix) {
        fRadix = radix;
        setShowRadixPrefix();
    }

    public void setShowRadixPrefix() {
        if (fRadix == 16) {
            fRadixPrefix = "0x"; //$NON-NLS-1$
        } else if (fRadix == 8) {
            fRadixPrefix = "0"; //$NON-NLS-1$
        } else {
            fRadixPrefix = null;
        }
    }

    /*
     * @see org.eclipse.jface.text.source.LineNumberRulerColumn#createDisplayString(int)
     */
    @Override
    protected String createDisplayString(int line) {
        int nChars = computeNumberOfCharacters();
        if (nChars > 0) {
            DisassemblyDocument doc = (DisassemblyDocument) getParentRuler().getTextViewer().getDocument();
            try {
                int offset = doc.getLineOffset(line);
                AddressRangePosition pos = doc.getDisassemblyPosition(offset);
                if (pos instanceof DisassemblyPosition && pos.length > 0 && pos.offset == offset && pos.fValid) {
                    DisassemblyPosition disassPos = (DisassemblyPosition) pos;
                    if (disassPos.fOpcodes != null) {
                        // Format the output.
                        String str = disassPos.fOpcodes.toString(fRadix);
                        int prefixLength = 0;

                        if (fRadixPrefix != null)
                            prefixLength = fRadixPrefix.length();

                        StringBuilder buf = new StringBuilder(nChars);

                        if (prefixLength != 0)
                            buf.append(fRadixPrefix);

                        for (int i = str.length() + prefixLength; i < nChars; ++i)
                            buf.append('0');
                        buf.append(str);
                        return buf.toString();
                    }
                } else if (pos != null && !pos.fValid) {
                    return DOTS.substring(0, nChars);
                }
            } catch (BadLocationException e) {
                // silently ignored
            }
        }
        return ""; //$NON-NLS-1$
    }

    @Override
    protected int computeNumberOfCharacters() {
        DisassemblyDocument doc = (DisassemblyDocument) getParentRuler().getTextViewer().getDocument();
        return doc.getMaxOpcodeLength(fRadix);
    }

    @Override
    public void propertyChange(PropertyChangeEvent event) {
        String property = event.getProperty();
        IPreferenceStore store = getPreferenceStore();
        boolean needRedraw = false;
        if (DisassemblyPreferenceConstants.CODE_BYTES_COLOR.equals(property)) {
            setForeground(getColor(property));
            needRedraw = true;
        } else if (DisassemblyPreferenceConstants.OPCODE_RADIX.equals(property)) {
            setRadix(store.getInt(property));
            layout(false);
            needRedraw = true;
        }
        if (needRedraw) {
            redraw();
        }
    }

}