com.iw.plugins.spindle.ui.wizards.fields.EngineClassDialog.java Source code

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Here is the source code for com.iw.plugins.spindle.ui.wizards.fields.EngineClassDialog.java

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/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (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.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Spindle, an Eclipse Plugin for Tapestry.
 *
 * The Initial Developer of the Original Code is
 * Geoffrey Longman.
 * Portions created by the Initial Developer are Copyright (C) 2001-2005
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 * 
 *  glongman@gmail.com
 *
 * ***** END LICENSE BLOCK ***** */
package com.iw.plugins.spindle.ui.wizards.fields;

import org.eclipse.core.runtime.IStatus;
import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jdt.core.IPackageFragmentRoot;
import org.eclipse.jdt.core.IType;
import org.eclipse.jdt.core.ITypeHierarchy;
import org.eclipse.jdt.core.JavaModelException;
import org.eclipse.jface.operation.IRunnableContext;

import com.iw.plugins.spindle.UIPlugin;
import com.iw.plugins.spindle.core.util.SpindleStatus;

public class EngineClassDialog extends TypeDialogField {

    /**
     * Constructor for EngineClassDialog.
     * @param name
     * @param hierarchyRoot
     */
    public EngineClassDialog(String name, String hierarchyRoot, int labelWidth) {
        super(name, hierarchyRoot, labelWidth);
    }

    /**
     * Constructor for EngineClassDialog.
     * @param name
     * @param hierarchyRoot
     * @param nameOnly
     */
    public EngineClassDialog(String name, String hierarchyRoot) {
        super(name, hierarchyRoot);
    }

    /**
     * Constructor for EngineClassDialog.
     * @param name
     * @param labelWidth
     */
    public EngineClassDialog(String name, int labelWidth) {
        super(name, labelWidth);
    }

    /**
     * Constructor for EngineClassDialog.
     * @param name
     * @param nameOnly
     */
    public EngineClassDialog(String name) {
        super(name);
    }

    public void init(PackageDialogField packageChooser, IRunnableContext context) {
        super.init(packageChooser, context);
        setTextValue(UIPlugin.getString("TapestryEngine.defaultEngine"));
    }

    protected IStatus typeChanged() {

        SpindleStatus status = new SpindleStatus();

        String engineClassname = getTextValue();
        IPackageFragmentRoot root = packageChooser.getContainer().getPackageFragmentRoot();

        enableButton(root != null);
        chosenType = null;
        if (root == null || engineClassname == null || "".equals(engineClassname)) {
            status.setError(UIPlugin.getString(name + ".warning.TypeNotExists", "'empty string'"));
            return status;
        }
        try {
            IType engineType = resolveTypeName(root.getJavaProject(), engineClassname);
            if (engineType == null) {
                status.setError(UIPlugin.getString(name + ".warning.TypeNotExists", engineClassname));
                return status;
            }
            boolean isBinary = engineType.isBinary();
            String engineBaseTypeName = UIPlugin.getString("TapestryEngine.classname");
            if (engineBaseTypeName == null) {
                throw new Error(
                        "tapestry engine base type: " + engineBaseTypeName + " does not exist in properties!");
            }
            IType engineBaseType = resolveTypeName(root.getJavaProject(), engineBaseTypeName);
            if (engineBaseType == null || !engineBaseType.exists()) {
                status.setError(UIPlugin.getString(name + ".warning.EngineBaseTypeNotExists", engineBaseTypeName));
                return status;
            }
            boolean match = false;
            if (engineBaseType.isInterface()) {
                String[] superInterfaces = engineType.getSuperInterfaceNames();
                if (superInterfaces != null && superInterfaces.length > 0) {
                    for (int i = 0; i < superInterfaces.length; i++) {
                        if (isBinary && engineBaseTypeName.endsWith(superInterfaces[i])) {
                            match = true;
                        } else {
                            match = engineBaseTypeName.equals(superInterfaces[i]);
                        }
                    }
                } else {
                    match = false;
                }
                if (!match) {
                    status.setWarning(UIPlugin.getString(name + ".warning.EngineDoesNotImplementInterface",
                            engineBaseTypeName));
                    return status;
                }
            } else {
                ITypeHierarchy hierarchy = engineType.newSupertypeHierarchy(null);
                if (hierarchy.exists()) {
                    IType[] superClasses = hierarchy.getAllSupertypes(engineType);
                    for (int i = 0; i < superClasses.length; i++) {
                        if (superClasses[i].equals(engineBaseType)) {
                            match = true;
                        }
                    }
                }
                if (!match) {
                    if (!canFindJavaxServletJar(root.getJavaProject())) {
                        status.setError(UIPlugin.getString(name + ".error.javax.servlet.jar.NOTFOUND"));
                    } else {
                        status.setError(
                                UIPlugin.getString(name + ".warning.EngineClassNotExtend", engineBaseTypeName));
                    }
                    return status;
                }
                chosenType = engineType;
            }

        } catch (JavaModelException e) {
            status.setError(name + ".error.couldn't.do.it");
        }

        return status;

    }

    /**
     * Method canFindJavaxServletJar.
     * @return boolean
     */
    private boolean canFindJavaxServletJar(IJavaProject project) {
        try {
            return resolveTypeName(project, "javax.servlet.Servlet") != null;
        } catch (JavaModelException e) {
        }
        return false;
    }

}