org.eclipse.wb.internal.swing.laf.model.UndefinedLafInfo.java Source code

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Here is the source code for org.eclipse.wb.internal.swing.laf.model.UndefinedLafInfo.java

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/*******************************************************************************
 * Copyright (c) 2011 Google, Inc.
 * 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:
 *    Google, Inc. - initial API and implementation
 *******************************************************************************/
package org.eclipse.wb.internal.swing.laf.model;

import org.eclipse.wb.internal.core.utils.ast.AstEditor;
import org.eclipse.wb.internal.core.utils.ast.AstNodeUtils;
import org.eclipse.wb.internal.swing.laf.LafSupport;

import org.eclipse.jdt.core.dom.MethodDeclaration;
import org.eclipse.jdt.core.dom.MethodInvocation;
import org.eclipse.jdt.core.dom.Statement;
import org.eclipse.jdt.core.dom.TryStatement;

import org.apache.commons.io.IOUtils;

import java.io.File;
import java.io.FileInputStream;
import java.util.Properties;

import javax.swing.UIManager;

/**
 * Used when no LAF selected explicitly.
 * 
 * @author mitin_aa
 * @coverage swing.laf.model
 */
public class UndefinedLafInfo extends LafInfo {
    public static final String UNDEFINED_LAF_NAME = "<undefined>";
    public static final LafInfo INSTANCE = new UndefinedLafInfo();
    private static Properties m_swingProperties;

    ////////////////////////////////////////////////////////////////////////////
    //
    // Constructor
    //
    ////////////////////////////////////////////////////////////////////////////
    private UndefinedLafInfo() {
        super("__wbp_" + UNDEFINED_LAF_NAME, UNDEFINED_LAF_NAME, getClassName0());
    }

    ////////////////////////////////////////////////////////////////////////////
    //
    // apply LAF in main() method
    //
    ////////////////////////////////////////////////////////////////////////////
    @Override
    public void applyInMain(AstEditor editor) throws Exception {
        // remove any setLookAndFeel method invocation, remove try..catch clauses if they are empty
        MethodDeclaration mainMethod = LafSupport.getMainMethod(editor);
        if (mainMethod == null) {
            // no main method 
            return;
        }
        // look up for setLookAndFeel method
        MethodInvocation setLookAndFeelMethod = LafSupport.getSetLookAndFeelMethod(mainMethod);
        if (setLookAndFeelMethod != null) {
            // remove it
            Statement enclosingMethodStatement = AstNodeUtils.getEnclosingStatement(setLookAndFeelMethod);
            // look for try..catch
            TryStatement tryStatement = AstNodeUtils.getEnclosingNode(enclosingMethodStatement, TryStatement.class);
            editor.removeStatement(enclosingMethodStatement);
            // remove try..catch if try statement has no statements now
            if (tryStatement != null && tryStatement.getBody().statements().isEmpty()) {
                editor.removeEnclosingStatement(tryStatement);
            }
            // done
            editor.commitChanges();
        }
    }

    ////////////////////////////////////////////////////////////////////////////
    //
    // LAFInfo
    //
    ////////////////////////////////////////////////////////////////////////////
    /**
     * Try to find which LAF used as "undefined", i.e. when no LAF explicitly specified in main.
     */
    private static synchronized String getClassName0() {
        // 1. Try to get system LAF class name from "swing.systemlaf" property name 
        // in $(java.home)/lib/swing.properties file.
        if (m_swingProperties == null) {
            String javaHome = System.getProperty("java.home");
            if (javaHome != null) {
                String propertiesFileName = javaHome + File.separator + "lib" + File.separator + "swing.properties";
                m_swingProperties = new Properties();
                File file = new File(propertiesFileName);
                if (file.exists()) {
                    try {
                        FileInputStream inputStream = new FileInputStream(file);
                        try {
                            m_swingProperties.load(inputStream);
                        } finally {
                            IOUtils.closeQuietly(inputStream);
                        }
                    } catch (Throwable e) {
                        // Just ignore any exceptions.
                    }
                }
            }
        }
        // 2. If no LAF defined in "swing.systemlaf" use cross-platform LAF like UIManager does.
        String systemLAFClassName = m_swingProperties.getProperty("swing.systemlaf");
        if (systemLAFClassName == null) {
            systemLAFClassName = UIManager.getCrossPlatformLookAndFeelClassName();
        }
        return systemLAFClassName;
    }

    ////////////////////////////////////////////////////////////////////////////
    //
    // No access
    //
    ////////////////////////////////////////////////////////////////////////////
    @Override
    public void setClassName(String className) {
    }
}