com.intellij.internal.encodings.EncodingViewer.java Source code

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Here is the source code for com.intellij.internal.encodings.EncodingViewer.java

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/*
 * Copyright 2000-2012 JetBrains s.r.o.
 *
 * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
 *
 * 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.intellij.internal.encodings;

import com.intellij.openapi.diagnostic.Logger;
import com.intellij.openapi.fileChooser.FileChooser;
import com.intellij.openapi.fileChooser.FileChooserDescriptorFactory;
import com.intellij.openapi.ui.DialogWrapper;
import com.intellij.openapi.vfs.CharsetToolkit;
import com.intellij.openapi.vfs.VirtualFile;

import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.nio.charset.Charset;
import java.util.Arrays;

public class EncodingViewer extends DialogWrapper {
    private static final Logger LOG = Logger.getInstance("#com.intellij.internal.encodings.EncodingViewer");

    private JPanel myPanel;
    private JTextArea myText;
    private JComboBox myEncoding;
    private JButton myLoadFile;
    private byte[] myBytes;

    public EncodingViewer() {
        super(false);
        initEncodings();
        myLoadFile.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                VirtualFile file = FileChooser.chooseFile(
                        FileChooserDescriptorFactory.createSingleFileNoJarsDescriptor(), myPanel, null, null);
                if (file != null) {
                    loadFrom(file);
                }
            }
        });
        init();
    }

    protected String getDimensionServiceKey() {
        return "EncodingViewer";
    }

    private void loadFrom(VirtualFile virtualFile) {
        try {
            myBytes = virtualFile.contentsToByteArray();
        } catch (IOException e) {
            LOG.error(e);
            return;
        }
        refreshText();
    }

    private void refreshText() {
        String selectedCharset = getSelectedCharset();
        if (myBytes == null || selectedCharset == null)
            return;
        try {
            myText.setText(new String(myBytes, selectedCharset));
        } catch (UnsupportedEncodingException e) {
            LOG.error(e);
        }
    }

    private String getSelectedCharset() {
        return ((Charset) myEncoding.getSelectedItem()).name();
    }

    private void initEncodings() {
        Charset[] availableCharsets = CharsetToolkit.getAvailableCharsets();
        myEncoding.setModel(new DefaultComboBoxModel(availableCharsets));
        int defaultIndex = Arrays.asList(availableCharsets).indexOf(CharsetToolkit.getDefaultSystemCharset());
        myEncoding.setSelectedIndex(defaultIndex);
        myEncoding.addItemListener(new ItemListener() {
            public void itemStateChanged(ItemEvent e) {
                if (e.getStateChange() == ItemEvent.SELECTED) {
                    refreshText();
                }
            }
        });
    }

    protected JComponent createCenterPanel() {
        return myPanel;
    }
}