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| author | Artur Signell <artur@vaadin.com> | 2012-08-13 18:34:33 +0300 |
|---|---|---|
| committer | Artur Signell <artur@vaadin.com> | 2012-08-13 19:18:33 +0300 |
| commit | e85d933b25cc3c5cc85eb7eb4b13b950fd8e1569 (patch) | |
| tree | 9ab6f13f7188cab44bbd979b1cf620f15328a03f /server/src/com/vaadin/data/util/TextFileProperty.java | |
| parent | 14dd4d0b28c76eb994b181a4570f3adec53342e6 (diff) | |
| download | vaadin-framework-e85d933b25cc3c5cc85eb7eb4b13b950fd8e1569.tar.gz vaadin-framework-e85d933b25cc3c5cc85eb7eb4b13b950fd8e1569.zip | |
Moved server files to a server src folder (#9299)
Diffstat (limited to 'server/src/com/vaadin/data/util/TextFileProperty.java')
| -rw-r--r-- | server/src/com/vaadin/data/util/TextFileProperty.java | 144 |
1 files changed, 144 insertions, 0 deletions
diff --git a/server/src/com/vaadin/data/util/TextFileProperty.java b/server/src/com/vaadin/data/util/TextFileProperty.java new file mode 100644 index 0000000000..598b721a9c --- /dev/null +++ b/server/src/com/vaadin/data/util/TextFileProperty.java @@ -0,0 +1,144 @@ +/* +@VaadinApache2LicenseForJavaFiles@ + */ + +package com.vaadin.data.util; + +import java.io.BufferedReader; +import java.io.BufferedWriter; +import java.io.File; +import java.io.FileInputStream; +import java.io.FileNotFoundException; +import java.io.FileOutputStream; +import java.io.IOException; +import java.io.InputStreamReader; +import java.io.OutputStreamWriter; +import java.nio.charset.Charset; + +/** + * Property implementation for wrapping a text file. + * + * Supports reading and writing of a File from/to String. + * + * {@link ValueChangeListener}s are supported, but only fire when + * setValue(Object) is explicitly called. {@link ReadOnlyStatusChangeListener}s + * are supported but only fire when setReadOnly(boolean) is explicitly called. + * + */ +@SuppressWarnings("serial") +public class TextFileProperty extends AbstractProperty<String> { + + private File file; + private Charset charset = null; + + /** + * Wrap given file with property interface. + * + * Setting the file to null works, but getValue() will return null. + * + * @param file + * File to be wrapped. + */ + public TextFileProperty(File file) { + this.file = file; + } + + /** + * Wrap the given file with the property interface and specify character + * set. + * + * Setting the file to null works, but getValue() will return null. + * + * @param file + * File to be wrapped. + * @param charset + * Charset to be used for reading and writing the file. + */ + public TextFileProperty(File file, Charset charset) { + this.file = file; + this.charset = charset; + } + + /* + * (non-Javadoc) + * + * @see com.vaadin.data.Property#getType() + */ + @Override + public Class<String> getType() { + return String.class; + } + + /* + * (non-Javadoc) + * + * @see com.vaadin.data.Property#getValue() + */ + @Override + public String getValue() { + if (file == null) { + return null; + } + try { + FileInputStream fis = new FileInputStream(file); + InputStreamReader isr = charset == null ? new InputStreamReader(fis) + : new InputStreamReader(fis, charset); + BufferedReader r = new BufferedReader(isr); + StringBuilder b = new StringBuilder(); + char buf[] = new char[8 * 1024]; + int len; + while ((len = r.read(buf)) != -1) { + b.append(buf, 0, len); + } + r.close(); + isr.close(); + fis.close(); + return b.toString(); + } catch (FileNotFoundException e) { + return null; + } catch (IOException e) { + throw new RuntimeException(e); + } + } + + /* + * (non-Javadoc) + * + * @see com.vaadin.data.Property#isReadOnly() + */ + @Override + public boolean isReadOnly() { + return file == null || super.isReadOnly() || !file.canWrite(); + } + + /* + * (non-Javadoc) + * + * @see com.vaadin.data.Property#setValue(java.lang.Object) + */ + @Override + public void setValue(Object newValue) throws ReadOnlyException { + if (isReadOnly()) { + throw new ReadOnlyException(); + } + if (file == null) { + return; + } + + try { + FileOutputStream fos = new FileOutputStream(file); + OutputStreamWriter osw = charset == null ? new OutputStreamWriter( + fos) : new OutputStreamWriter(fos, charset); + BufferedWriter w = new BufferedWriter(osw); + w.append(newValue.toString()); + w.flush(); + w.close(); + osw.close(); + fos.close(); + fireValueChange(); + } catch (IOException e) { + throw new RuntimeException(e); + } + } + +} |