diff options
Diffstat (limited to 'sca-java-1.x/tags/1.6-TUSCANY-3909/implementation-script/src/main/java/org/apache/tuscany/sca/implementation/script/engines/TuscanyJRubyScriptEngine.java')
| -rw-r--r-- | sca-java-1.x/tags/1.6-TUSCANY-3909/implementation-script/src/main/java/org/apache/tuscany/sca/implementation/script/engines/TuscanyJRubyScriptEngine.java | 697 |
1 files changed, 697 insertions, 0 deletions
diff --git a/sca-java-1.x/tags/1.6-TUSCANY-3909/implementation-script/src/main/java/org/apache/tuscany/sca/implementation/script/engines/TuscanyJRubyScriptEngine.java b/sca-java-1.x/tags/1.6-TUSCANY-3909/implementation-script/src/main/java/org/apache/tuscany/sca/implementation/script/engines/TuscanyJRubyScriptEngine.java new file mode 100644 index 0000000000..324246c32b --- /dev/null +++ b/sca-java-1.x/tags/1.6-TUSCANY-3909/implementation-script/src/main/java/org/apache/tuscany/sca/implementation/script/engines/TuscanyJRubyScriptEngine.java @@ -0,0 +1,697 @@ +/*
+* Copyright (c) 2006, Sun Microsystems, Inc.
+* All rights reserved.
+*
+* Redistribution and use in source and binary forms, with or without
+* modification, are permitted provided that the following conditions are met:
+*
+* - Redistributions of source code must retain the above copyright notice, this
+* list of conditions and the following disclaimer.
+*
+* - Redistributions in binary form must reproduce the above copyright notice,
+* this list of conditions and the following disclaimer in the documentation
+* and/or other materials provided with the distribution.
+*
+* - Neither the name of the Sun Microsystems, Inc. nor the names of
+* contributors may be used to endorse or promote products derived from this
+* software without specific prior written permission.
+*
+* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
+* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY
+* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
+* DAMAGE.
+*/
+package org.apache.tuscany.sca.implementation.script.engines;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.io.PrintStream;
+import java.io.Reader;
+import java.io.StringWriter;
+import java.io.UnsupportedEncodingException;
+import java.io.Writer;
+import java.lang.reflect.InvocationHandler;
+import java.lang.reflect.Method;
+import java.lang.reflect.Proxy;
+import java.nio.ByteBuffer;
+import java.nio.CharBuffer;
+import java.nio.charset.Charset;
+import java.nio.charset.CharsetDecoder;
+import java.nio.charset.CoderResult;
+import java.nio.charset.CodingErrorAction;
+import java.security.AccessController;
+import java.security.PrivilegedAction;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Set;
+
+import javax.script.AbstractScriptEngine;
+import javax.script.Bindings;
+import javax.script.Compilable;
+import javax.script.CompiledScript;
+import javax.script.Invocable;
+import javax.script.ScriptContext;
+import javax.script.ScriptEngine;
+import javax.script.ScriptEngineFactory;
+import javax.script.ScriptException;
+import javax.script.SimpleBindings;
+
+import org.jruby.Ruby;
+import org.jruby.RubyException;
+import org.jruby.RubyIO;
+import org.jruby.RubyObject;
+import org.jruby.ast.Node;
+import org.jruby.exceptions.RaiseException;
+import org.jruby.internal.runtime.GlobalVariable;
+import org.jruby.internal.runtime.GlobalVariables;
+import org.jruby.internal.runtime.ReadonlyAccessor;
+import org.jruby.internal.runtime.ValueAccessor;
+import org.jruby.javasupport.Java;
+import org.jruby.javasupport.JavaEmbedUtils;
+import org.jruby.javasupport.JavaObject;
+import org.jruby.javasupport.JavaUtil;
+import org.jruby.runtime.Block;
+import org.jruby.runtime.IAccessor;
+import org.jruby.runtime.builtin.IRubyObject;
+import org.jruby.util.KCode;
+
+import com.sun.script.jruby.JRubyScriptEngineFactory;
+
+/**
+ * This class is a copy of the class com.sun.script.ruby.JRubyScriptEngine with some minor modifications
+ * to work around problems with Tuscany setting SCA properties and references as global variable in JRuby
+ * Should only need it temporarily till a new BSF release fixes it.
+ *
+ * @version $Rev$ $Date$
+ */
+@SuppressWarnings("unchecked")
+public class TuscanyJRubyScriptEngine extends AbstractScriptEngine
+ implements Compilable, Invocable {
+
+ // my factory, may be null
+ private ScriptEngineFactory factory;
+ private Ruby runtime;
+
+ public TuscanyJRubyScriptEngine() {
+ // Allow privileged access to ready properties. Requires PropertyPermission in security
+ // policy.
+ String rubyPath = AccessController.doPrivileged(new PrivilegedAction<String>() {
+ public String run() {
+ return System.getProperty("com.sun.script.jruby.loadpath");
+ }
+ });
+ init(rubyPath);
+ }
+
+ public TuscanyJRubyScriptEngine(String loadPath) {
+ init(loadPath);
+ }
+
+ // my implementation for CompiledScript
+ private class JRubyCompiledScript extends CompiledScript {
+ // my compiled code
+ private Node node;
+
+ JRubyCompiledScript (Node node) {
+ this.node = node;
+ }
+
+ public ScriptEngine getEngine() {
+ return TuscanyJRubyScriptEngine.this;
+ }
+
+ public Object eval(ScriptContext ctx) throws ScriptException {
+ return evalNode(node, ctx);
+ }
+ }
+
+ // Compilable methods
+ public CompiledScript compile(String script)
+ throws ScriptException {
+ Node node = compileScript(script, context);
+ return new JRubyCompiledScript(node);
+ }
+
+ public CompiledScript compile (Reader reader)
+ throws ScriptException {
+ Node node = compileScript(reader, context);
+ return new JRubyCompiledScript(node);
+ }
+
+ // Invocable methods
+ public Object invokeFunction(String name, Object... args)
+ throws ScriptException, NoSuchMethodException {
+ return invokeImpl(null, name, args, Object.class);
+ }
+
+ public Object invokeMethod(Object obj, String name, Object... args)
+ throws ScriptException, NoSuchMethodException {
+ if (obj == null) {
+ throw new IllegalArgumentException("script object is null");
+ }
+ return invokeImpl(obj, name, args, Object.class);
+ }
+
+ public Object getInterface(Object obj, Class clazz) {
+ if (obj == null) {
+ throw new IllegalArgumentException("script object is null");
+ }
+ return makeInterface(obj, clazz);
+ }
+
+ public Object getInterface(Class clazz) {
+ return makeInterface(null, clazz);
+ }
+
+ private <T> T makeInterface(Object obj, Class<T> clazz) {
+ if (clazz == null || !clazz.isInterface()) {
+ throw new IllegalArgumentException("interface Class expected");
+ }
+ final Object thiz = obj;
+ return (T) Proxy.newProxyInstance(
+ clazz.getClassLoader(),
+ new Class[] { clazz },
+ new InvocationHandler() {
+ public Object invoke(Object proxy, Method m, Object[] args)
+ throws Throwable {
+ return invokeImpl(thiz, m.getName(),
+ args, m.getReturnType());
+ }
+ });
+ }
+
+ // ScriptEngine methods
+ public synchronized Object eval(String str, ScriptContext ctx)
+ throws ScriptException {
+ Node node = compileScript(str, ctx);
+ return evalNode(node, ctx);
+ }
+
+ public synchronized Object eval(Reader reader, ScriptContext ctx)
+ throws ScriptException {
+ Node node = compileScript(reader, ctx);
+ return evalNode(node, ctx);
+ }
+
+ public ScriptEngineFactory getFactory() {
+ synchronized (this) {
+ if (factory == null) {
+ factory = new JRubyScriptEngineFactory();
+ }
+ }
+ return factory;
+ }
+
+ public Bindings createBindings() {
+ return new SimpleBindings();
+ }
+
+ // package-private methods
+ void setFactory(ScriptEngineFactory factory) {
+ this.factory = factory;
+ }
+
+ // internals only below this point
+
+ private Object rubyToJava(IRubyObject value) {
+ return rubyToJava(value, Object.class);
+ }
+
+ private Object rubyToJava(IRubyObject value, Class type) {
+ return JavaUtil.convertArgument(
+ runtime,
+ Java.ruby_to_java(value, value, Block.NULL_BLOCK),
+ type);
+ }
+
+ private IRubyObject javaToRuby(Object value) {
+ if (value instanceof IRubyObject) {
+ return (IRubyObject) value;
+ }
+ IRubyObject result = JavaUtil.convertJavaToRuby(runtime, value);
+ if (result instanceof JavaObject) {
+ return runtime.getModule("JavaUtilities").callMethod(runtime.getCurrentContext(), "wrap", result);
+ }
+ return result;
+ }
+
+ private synchronized Node compileScript(String script, ScriptContext ctx)
+ throws ScriptException {
+ GlobalVariables oldGlobals = runtime.getGlobalVariables();
+ try {
+ setErrorWriter(ctx.getErrorWriter());
+ setGlobalVariables(ctx);
+ String filename = (String) ctx.getAttribute(ScriptEngine.FILENAME);
+ if (filename == null) {
+ filename = "<unknown>";
+ }
+ return runtime.parseEval(script, filename, null, 0);
+ } catch (RaiseException e) {
+ RubyException re = e.getException();
+ runtime.printError(re);
+ throw new ScriptException(e);
+ } catch (Exception e) {
+ throw new ScriptException(e);
+ } finally {
+ if (oldGlobals != null) {
+ setGlobalVariables(oldGlobals);
+ }
+ }
+ }
+
+ private synchronized Node compileScript(Reader reader, ScriptContext ctx)
+ throws ScriptException {
+ GlobalVariables oldGlobals = runtime.getGlobalVariables();
+ try {
+ setErrorWriter(ctx.getErrorWriter());
+ setGlobalVariables(ctx);
+ String filename = (String) ctx.getAttribute(ScriptEngine.FILENAME);
+ if (filename == null) {
+ filename = "<unknown>";
+ String script = getRubyScript(reader);
+ return runtime.parseEval(script, filename, null, 0);
+ }
+ InputStream inputStream = getRubyReader(filename);
+ return runtime.parseFile(inputStream, filename, null);
+ } catch (RaiseException e) {
+ RubyException re = e.getException();
+ runtime.printError(re);
+ throw new ScriptException(e);
+ } catch (Exception exp) {
+ throw new ScriptException(exp);
+ } finally {
+ if (oldGlobals != null) {
+ setGlobalVariables(oldGlobals);
+ }
+ }
+ }
+
+ private String getRubyScript(Reader reader) throws IOException {
+ StringBuffer sb = new StringBuffer();
+ char[] cbuf;
+ while (true) {
+ cbuf = new char[8*1024];
+ int chars = reader.read(cbuf, 0, cbuf.length);
+ if (chars < 0) {
+ break;
+ }
+ sb.append(cbuf, 0, chars);
+ }
+ cbuf = null;
+ return (new String(sb)).trim();
+ }
+
+ private InputStream getRubyReader(String filename) throws FileNotFoundException {
+ File file = new File(filename);
+ return new FileInputStream(file);
+ }
+
+ private void setGlobalVariables(final ScriptContext ctx) {
+ ctx.setAttribute("context", ctx, ScriptContext.ENGINE_SCOPE);
+ setGlobalVariables(new GlobalVariables(runtime) {
+ GlobalVariables parent = runtime.getGlobalVariables();
+
+ @Override
+ public void define(String name, IAccessor accessor) {
+ assert name != null;
+ assert accessor != null;
+ assert name.startsWith("$");
+ synchronized (ctx) {
+ Bindings engineScope = ctx.getBindings(ScriptContext.ENGINE_SCOPE);
+ engineScope.put(name, new GlobalVariable(accessor));
+ }
+ }
+
+ @Override
+ public void defineReadonly(String name, IAccessor accessor) {
+ assert name != null;
+ assert accessor != null;
+ assert name.startsWith("$");
+ synchronized (ctx) {
+ Bindings engineScope = ctx.getBindings(ScriptContext.ENGINE_SCOPE);
+ engineScope.put(name, new GlobalVariable(new
+ ReadonlyAccessor(name, accessor)));
+ }
+ }
+
+ @Override
+ public boolean isDefined(String name) {
+ assert name != null;
+ assert name.startsWith("$");
+ synchronized (ctx) {
+ String modifiedName = name.substring(1);
+ boolean defined = ctx.getAttributesScope(modifiedName) != -1;
+ return defined ? true : parent.isDefined(name);
+ }
+ }
+
+ @Override
+ public void alias(String name, String oldName) {
+ assert name != null;
+ assert oldName != null;
+ assert name.startsWith("$");
+ assert oldName.startsWith("$");
+
+ if (runtime.getSafeLevel() >= 4) {
+ throw runtime.newSecurityError("Insecure: can't alias global variable");
+ }
+
+ synchronized (ctx) {
+ int scope = ctx.getAttributesScope(name);
+ if (scope == -1) {
+ scope = ScriptContext.ENGINE_SCOPE;
+ }
+
+ IRubyObject value = get(oldName);
+ ctx.setAttribute(name, rubyToJava(value), scope);
+ }
+ }
+
+ @Override
+ public IRubyObject get(String name) {
+ assert name != null;
+ assert name.startsWith("$");
+
+ synchronized (ctx) {
+ // skip '$' and try
+ String modifiedName = name.substring(1);
+ int scope = ctx.getAttributesScope(modifiedName);
+ if (scope == -1) {
+ return parent.get(name);
+ }
+
+ Object obj = ctx.getAttribute(modifiedName, scope);
+ if (obj instanceof IAccessor) {
+ return ((IAccessor)obj).getValue();
+ } else {
+ return javaToRuby(obj);
+ }
+ }
+ }
+
+ @Override
+ public IRubyObject set(String name, IRubyObject value) {
+ assert name != null;
+ assert name.startsWith("$");
+
+ if (runtime.getSafeLevel() >= 4) {
+ throw runtime.newSecurityError("Insecure: can't change global variable value");
+ }
+
+ synchronized (ctx) {
+ // skip '$' and try
+ String modifiedName = name.substring(1);
+ int scope = ctx.getAttributesScope(modifiedName);
+ if (scope == -1) {
+ scope = ScriptContext.ENGINE_SCOPE;
+ }
+ IRubyObject oldValue = get(name);
+ Object obj = ctx.getAttribute(modifiedName, scope);
+ if (obj instanceof IAccessor) {
+ ((IAccessor)obj).setValue(value);
+ } else {
+ ctx.setAttribute(modifiedName, rubyToJava(value), scope);
+ if ("KCODE".equals(modifiedName)) {
+ setKCode((String)rubyToJava(value));
+ } else if ("stdout".equals(modifiedName)) {
+ equalOutputs((RubyObject)value);
+ }
+ }
+ return oldValue;
+ }
+ }
+
+ @Override
+ public Set<String> getNames() {
+ HashSet set = new HashSet();
+ synchronized (ctx) {
+ for (Object scope : ctx.getScopes()) {
+ Bindings b = ctx.getBindings((Integer)scope);
+ if (b != null) {
+ for (Object key: b.keySet()) {
+ set.add(key);
+ }
+ }
+ }
+ }
+ for (Iterator<String> names = parent.getNames().iterator(); names.hasNext();) {
+ set.add(names.next());
+ }
+ return Collections.unmodifiableSet(set);
+ }
+
+ @Override
+ public IRubyObject getDefaultSeparator() {
+ return parent.getDefaultSeparator();
+ }
+ });
+ }
+
+ private void setGlobalVariables(GlobalVariables globals) {
+ runtime.setGlobalVariables(globals);
+ }
+
+ private synchronized Object evalNode(Node node, ScriptContext ctx)
+ throws ScriptException {
+ GlobalVariables oldGlobals = runtime.getGlobalVariables();
+ try {
+ setWriterOutputStream(ctx.getWriter());
+ setErrorWriter(ctx.getErrorWriter());
+ setGlobalVariables(ctx);
+ return rubyToJava(runtime.runNormally(node, false));
+ } catch (Exception exp) {
+ throw new ScriptException(exp);
+ } finally {
+ try {
+ JavaEmbedUtils.terminate(runtime);
+ } catch (RaiseException e) {
+ RubyException re = e.getException();
+ runtime.printError(re);
+ if (!runtime.fastGetClass("SystemExit").isInstance(re)) {
+ throw new ScriptException(e);
+ }
+ } finally {
+ if (oldGlobals != null) {
+ setGlobalVariables(oldGlobals);
+ }
+ }
+ }
+ }
+
+ private void init(final String loadPath) {
+ AccessController.doPrivileged(new PrivilegedAction<Object>() {
+ public Object run() {
+ runtime = Ruby.newInstance();
+ IAccessor d = new ValueAccessor(runtime.newString("<script>"));
+ runtime.getGlobalVariables().define("$PROGRAM_NAME", d);
+ runtime.getGlobalVariables().define("$0", d);
+ String path = loadPath;
+ if (path == null) {
+ path = System.getProperty("java.class.path");
+ }
+ List list = Arrays.asList(path.split(File.pathSeparator));
+ runtime.getLoadService().init(list);
+ runtime.getLoadService().require("java");
+ return null;
+ }
+ });
+ }
+
+ private synchronized Object invokeImpl(final Object obj, String method,
+ Object[] args, Class returnType)
+ throws ScriptException {
+ if (method == null) {
+ throw new NullPointerException("method name is null");
+ }
+ GlobalVariables oldGlobals = runtime.getGlobalVariables();
+ try {
+ setWriterOutputStream(context.getWriter());
+ setErrorWriter(context.getErrorWriter());
+ setGlobalVariables(context);
+ IRubyObject rubyRecv = obj != null ?
+ JavaUtil.convertJavaToRuby(runtime, obj) : runtime.getTopSelf();
+
+ IRubyObject result;
+ if (args != null && args.length > 0) {
+ IRubyObject[] rubyArgs = JavaUtil.convertJavaArrayToRuby(runtime, args);
+ // Create Ruby proxies for any input arguments that are not primitives.
+ IRubyObject javaUtilities = runtime.getObject().getConstant("JavaUtilities");
+ for (int i = 0; i < rubyArgs.length; i++) {
+ IRubyObject tmp = rubyArgs[i];
+ if (tmp instanceof JavaObject) {
+ rubyArgs[i] = javaUtilities.callMethod(runtime.getCurrentContext(), "wrap", tmp);
+ }
+ }
+ result = rubyRecv.callMethod(runtime.getCurrentContext(), method, rubyArgs);
+ } else {
+ result = rubyRecv.callMethod(runtime.getCurrentContext(), method);
+ }
+ return rubyToJava(result, returnType);
+ } catch (Exception exp) {
+ throw new ScriptException(exp);
+ } finally {
+ try {
+ JavaEmbedUtils.terminate(runtime);
+ } catch (RaiseException e) {
+ RubyException re = e.getException();
+ runtime.printError(re);
+ if (!runtime.fastGetClass("SystemExit").isInstance(re)) {
+ throw new ScriptException(e);
+ }
+ } finally {
+ if (oldGlobals != null) {
+ setGlobalVariables(oldGlobals);
+ }
+ }
+ }
+ }
+
+ private void setKCode(String encoding) {
+ KCode kcode = KCode.create(runtime, encoding);
+ runtime.setKCode(kcode);
+ }
+
+ private void equalOutputs(RubyObject value) {
+ runtime.getGlobalVariables().set("$>", value);
+ runtime.getGlobalVariables().set("$defout", value);
+ }
+
+ private void setWriterOutputStream(Writer writer) {
+ try {
+ RubyIO dummy_io =
+ new RubyIO(runtime, new PrintStream(new WriterOutputStream(new StringWriter())));
+ runtime.getGlobalVariables().set("$stderr", dummy_io); //discard unwanted warnings
+ RubyIO io =
+ new RubyIO(runtime, new PrintStream(new WriterOutputStream(writer)));
+ io.getOpenFile().getMainStream().setSync(true);
+ runtime.defineGlobalConstant("STDOUT", io);
+ runtime.getGlobalVariables().set("$>", io);
+ runtime.getGlobalVariables().set("$stdout", io);
+ runtime.getGlobalVariables().set("$defout", io);
+ } catch (UnsupportedEncodingException exp) {
+ throw new IllegalArgumentException(exp);
+ }
+ }
+
+ private void setErrorWriter(Writer writer) {
+ try {
+ RubyIO dummy_io =
+ new RubyIO(runtime, new PrintStream(new WriterOutputStream(new StringWriter())));
+ runtime.getGlobalVariables().set("$stderr", dummy_io); //discard unwanted warnings
+ RubyIO io =
+ new RubyIO(runtime, new PrintStream(new WriterOutputStream(writer)));
+ io.getOpenFile().getMainStream().setSync(true);
+ runtime.defineGlobalConstant("STDERR", io);
+ runtime.getGlobalVariables().set("$stderr", io);
+ runtime.getGlobalVariables().set("$deferr", io);
+ } catch (UnsupportedEncodingException exp) {
+ throw new IllegalArgumentException(exp);
+ }
+ }
+
+ private String getEncoding() {
+ String enc = System.getProperty("sun.jnu.encoding");
+ if (enc != null) {
+ return enc;
+ }
+ return ((enc = System.getProperty("file.encoding")) == null) ? "UTF-8" : enc;
+ }
+
+ private class WriterOutputStream extends OutputStream {
+
+ private Writer writer;
+ private CharsetDecoder decoder;
+
+ private WriterOutputStream(Writer writer) throws UnsupportedEncodingException {
+ this(writer, getEncoding());
+ }
+
+ private WriterOutputStream(Writer writer, String enc) throws UnsupportedEncodingException {
+ this.writer = writer;
+ if (enc == null) {
+ throw new UnsupportedEncodingException("encoding is " + enc);
+ }
+ try {
+ decoder = Charset.forName(enc).newDecoder();
+ } catch (Exception e) {
+ throw new UnsupportedEncodingException("Unsupported: " + enc);
+ }
+ decoder.onMalformedInput(CodingErrorAction.REPLACE);
+ decoder.onUnmappableCharacter(CodingErrorAction.REPLACE);
+ }
+
+ @Override
+ public void close() throws IOException {
+ synchronized(writer) {
+ decoder = null;
+ writer.close();
+ }
+ }
+
+ @Override
+ public void flush() throws IOException {
+ synchronized(writer) {
+ writer.flush();
+ }
+ }
+
+ @Override
+ public void write(int b) throws IOException {
+ byte[] buffer = new byte[1];
+ write(buffer, 0, 1);
+ }
+
+ @Override
+ public void write(byte[] buffer) throws IOException {
+ write(buffer, 0, buffer.length);
+ }
+
+ @Override
+ public void write(byte[] buffer, int offset, int length) throws IOException {
+ synchronized(writer) {
+ if (offset < 0 || offset > buffer.length - length || length < 0) {
+ throw new IndexOutOfBoundsException();
+ }
+ if (length == 0) {
+ return;
+ }
+ ByteBuffer bytes = ByteBuffer.wrap(buffer, offset, length);
+ CharBuffer chars = CharBuffer.allocate(length);
+ convert(bytes, chars);
+ char[] cbuf = new char[chars.length()];
+ chars.get(cbuf, 0, chars.length());
+ writer.write(cbuf);
+ writer.flush();
+ }
+ }
+
+ private void convert(ByteBuffer bytes, CharBuffer chars) throws IOException {
+ decoder.reset();
+ chars.clear();
+ CoderResult result = decoder.decode(bytes, chars, true);
+ if (result.isError() || result.isOverflow()) {
+ throw new IOException(result.toString());
+ } else if (result.isUnderflow()) {
+ chars.flip();
+ }
+ }
+ }
+}
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