com.google.dart.tools.ui.callhierarchy.LocationLabelProvider.java Source code

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Here is the source code for com.google.dart.tools.ui.callhierarchy.LocationLabelProvider.java

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/*
 * Copyright (c) 2012, the Dart project authors.
 * 
 * Licensed under the Eclipse Public License v1.0 (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.eclipse.org/legal/epl-v10.html
 * 
 * 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 com.google.dart.tools.ui.callhierarchy;

import com.google.dart.tools.ui.DartPluginImages;
import com.google.dart.tools.ui.internal.callhierarchy.CallLocation;

import org.eclipse.jface.viewers.ITableLabelProvider;
import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.swt.graphics.Image;

class LocationLabelProvider extends LabelProvider implements ITableLabelProvider {
    private static final int COLUMN_ICON = 0;
    private static final int COLUMN_LINE = 1;
    private static final int COLUMN_INFO = 2;

    LocationLabelProvider() {
        // Do nothing
    }

    @Override
    public Image getColumnImage(Object element, int columnIndex) {
        if (columnIndex == COLUMN_ICON) {
            return DartPluginImages.get(DartPluginImages.IMG_OBJS_SEARCH_OCCURRENCE);
        }
        return null;
    }

    @Override
    public String getColumnText(Object element, int columnIndex) {
        if (element instanceof CallLocation) {
            CallLocation callLocation = (CallLocation) element;

            switch (columnIndex) {
            case COLUMN_LINE:
                int lineNumber = callLocation.getLineNumber();
                if (lineNumber == CallLocation.UNKNOWN_LINE_NUMBER) {
                    return CallHierarchyMessages.LocationLabelProvider_unknown;
                } else {
                    return String.valueOf(lineNumber);
                }
            case COLUMN_INFO:
                return removeWhitespaceOutsideStringLiterals(callLocation);
            }
        }

        return ""; //$NON-NLS-1$
    }

    @Override
    public Image getImage(Object element) {
        return getColumnImage(element, COLUMN_ICON);
    }

    @Override
    public String getText(Object element) {
        return getColumnText(element, COLUMN_INFO);
    }

    private String removeWhitespaceOutsideStringLiterals(CallLocation callLocation) {
        StringBuffer buf = new StringBuffer();
        boolean withinString = false;

        String s = callLocation.getCallText();
        for (int i = 0; i < s.length(); i++) {
            char ch = s.charAt(i);

            if (ch == '"') {
                withinString = !withinString;
            }

            if (withinString) {
                buf.append(ch);
            } else if (Character.isWhitespace(ch)) {
                if ((buf.length() == 0) || !Character.isWhitespace(buf.charAt(buf.length() - 1))) {
                    if (ch != ' ') {
                        ch = ' ';
                    }

                    buf.append(ch);
                }
            } else {
                buf.append(ch);
            }
        }

        return buf.toString();
    }
}