Java tutorial
/* * Copyright (c) 2011, 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.internal.preferences; import com.google.dart.tools.ui.Flags; import com.google.dart.tools.ui.PreferenceConstants; import org.eclipse.jface.preference.IPreferenceStore; import org.eclipse.jface.util.IPropertyChangeListener; import org.eclipse.jface.util.PropertyChangeEvent; import java.util.StringTokenizer; public class MembersOrderPreferenceCache implements IPropertyChangeListener { public static final int TYPE_INDEX = 0; public static final int CONSTRUCTORS_INDEX = 1; public static final int METHOD_INDEX = 2; public static final int FIELDS_INDEX = 3; public static final int INIT_INDEX = 4; public static final int STATIC_FIELDS_INDEX = 5; public static final int STATIC_INIT_INDEX = 6; public static final int STATIC_METHODS_INDEX = 7; public static final int ENUM_CONSTANTS_INDEX = 8; public static final int N_CATEGORIES = ENUM_CONSTANTS_INDEX + 1; private static final int PUBLIC_INDEX = 0; private static final int PRIVATE_INDEX = 1; private static final int PROTECTED_INDEX = 2; private static final int DEFAULT_INDEX = 3; private static final int N_VISIBILITIES = DEFAULT_INDEX + 1; public static boolean isMemberOrderProperty(String property) { return PreferenceConstants.APPEARANCE_MEMBER_SORT_ORDER.equals(property) || PreferenceConstants.APPEARANCE_VISIBILITY_SORT_ORDER.equals(property) || PreferenceConstants.APPEARANCE_ENABLE_VISIBILITY_SORT_ORDER.equals(property); } private int[] fCategoryOffsets = null; private boolean fSortByVisibility; private int[] fVisibilityOffsets = null; private IPreferenceStore fPreferenceStore; public MembersOrderPreferenceCache() { fPreferenceStore = null; fCategoryOffsets = null; fSortByVisibility = false; fVisibilityOffsets = null; } public void dispose() { fPreferenceStore.removePropertyChangeListener(this); fPreferenceStore = null; } public int getCategoryIndex(int kind) { if (fCategoryOffsets == null) { fCategoryOffsets = getCategoryOffsets(); } return fCategoryOffsets[kind]; } public int getVisibilityIndex(int modifierFlags) { if (fVisibilityOffsets == null) { fVisibilityOffsets = getVisibilityOffsets(); } int kind = DEFAULT_INDEX; if (Flags.isPublic(modifierFlags)) { kind = PUBLIC_INDEX; } else if (Flags.isPrivate(modifierFlags)) { kind = PRIVATE_INDEX; } return fVisibilityOffsets[kind]; } public void install(IPreferenceStore store) { fPreferenceStore = store; store.addPropertyChangeListener(this); fSortByVisibility = store.getBoolean(PreferenceConstants.APPEARANCE_ENABLE_VISIBILITY_SORT_ORDER); } public boolean isSortByVisibility() { return fSortByVisibility; } @Override public void propertyChange(PropertyChangeEvent event) { String property = event.getProperty(); if (PreferenceConstants.APPEARANCE_MEMBER_SORT_ORDER.equals(property)) { fCategoryOffsets = null; } else if (PreferenceConstants.APPEARANCE_VISIBILITY_SORT_ORDER.equals(property)) { fVisibilityOffsets = null; } else if (PreferenceConstants.APPEARANCE_ENABLE_VISIBILITY_SORT_ORDER.equals(property)) { fSortByVisibility = fPreferenceStore .getBoolean(PreferenceConstants.APPEARANCE_ENABLE_VISIBILITY_SORT_ORDER); } } private boolean fillCategoryOffsetsFromPreferenceString(String str, int[] offsets) { StringTokenizer tokenizer = new StringTokenizer(str, ","); //$NON-NLS-1$ int i = 0; offsets[ENUM_CONSTANTS_INDEX] = i++; // enum constants always on top while (tokenizer.hasMoreTokens()) { String token = tokenizer.nextToken().trim(); if ("T".equals(token)) { //$NON-NLS-1$ offsets[TYPE_INDEX] = i++; } else if ("M".equals(token)) { //$NON-NLS-1$ offsets[METHOD_INDEX] = i++; } else if ("F".equals(token)) { //$NON-NLS-1$ offsets[FIELDS_INDEX] = i++; } else if ("I".equals(token)) { //$NON-NLS-1$ offsets[INIT_INDEX] = i++; } else if ("SF".equals(token)) { //$NON-NLS-1$ offsets[STATIC_FIELDS_INDEX] = i++; } else if ("SI".equals(token)) { //$NON-NLS-1$ offsets[STATIC_INIT_INDEX] = i++; } else if ("SM".equals(token)) { //$NON-NLS-1$ offsets[STATIC_METHODS_INDEX] = i++; } else if ("C".equals(token)) { //$NON-NLS-1$ offsets[CONSTRUCTORS_INDEX] = i++; } } return i == N_CATEGORIES; } private boolean fillVisibilityOffsetsFromPreferenceString(String str, int[] offsets) { StringTokenizer tokenizer = new StringTokenizer(str, ","); //$NON-NLS-1$ int i = 0; while (tokenizer.hasMoreTokens()) { String token = tokenizer.nextToken().trim(); if ("B".equals(token)) { //$NON-NLS-1$ offsets[PUBLIC_INDEX] = i++; } else if ("V".equals(token)) { //$NON-NLS-1$ offsets[PRIVATE_INDEX] = i++; } else if ("R".equals(token)) { //$NON-NLS-1$ offsets[PROTECTED_INDEX] = i++; } else if ("D".equals(token)) { //$NON-NLS-1$ offsets[DEFAULT_INDEX] = i++; } } return i == N_VISIBILITIES; } private int[] getCategoryOffsets() { int[] offsets = new int[N_CATEGORIES]; IPreferenceStore store = fPreferenceStore; String key = PreferenceConstants.APPEARANCE_MEMBER_SORT_ORDER; boolean success = fillCategoryOffsetsFromPreferenceString(store.getString(key), offsets); if (!success) { store.setToDefault(key); fillCategoryOffsetsFromPreferenceString(store.getDefaultString(key), offsets); } return offsets; } private int[] getVisibilityOffsets() { int[] offsets = new int[N_VISIBILITIES]; IPreferenceStore store = fPreferenceStore; String key = PreferenceConstants.APPEARANCE_VISIBILITY_SORT_ORDER; boolean success = fillVisibilityOffsetsFromPreferenceString(store.getString(key), offsets); if (!success) { store.setToDefault(key); fillVisibilityOffsetsFromPreferenceString(store.getDefaultString(key), offsets); } return offsets; } }