package org.eclipse.jdt.internal.codeassist;

import org.eclipse.core.runtime.*;
import org.eclipse.jdt.core.compiler.*;
import javax.swing.*;
import java.io.*;

public class InputMatcher {
  InputMatcherPlugin[] matcherPlugins;
  static InputMatcher plugin = new InputMatcher();
  public InputMatcher() {
    init();
  }

  private void init() {
    plugin = this;
    try {
      matcherPlugins = instantiateMatchers();
    } catch (CoreException ex) {
    }
  }

  protected InputMatcherPlugin[] instantiateMatchers() throws CoreException {
    IExtensionPoint plugin = Platform.getPluginRegistry().
                              getExtensionPoint(org.eclipse.jdt.core.JavaCore.PLUGIN_ID, "inputMatcher");
    IExtension[] extensions = plugin.getExtensions();
    if (extensions == null || extensions.length == 0)
      return null;
    InputMatcherPlugin[] ret = new InputMatcherPlugin[extensions.length];
    for (int i = 0; i < extensions.length; i++) {
      String className = extensions[i].getConfigurationElements()[0].getAttribute("class");
      InputMatcherPlugin matcher = null;
      matcher = (InputMatcherPlugin)
                 extensions[i].getConfigurationElements()[0].createExecutableExtension("class");
      ret[i] = matcher;
    }
    return ret;
  }
  public boolean inputMatches(
          char[] input,
          char[] name,
          boolean isCaseSensitive) {
    if (matcherPlugins == null || matcherPlugins.length == 0)
      return CharOperation.prefixEquals(input, name, isCaseSensitive);

    for (int i = 0; i < matcherPlugins.length; i++) {
      if (matcherPlugins[i].inputMatched(input, name, isCaseSensitive)) {
        return true;
      }
    }
    return false;
  }
  public synchronized static boolean prefixEquals(
          char[] input,
          char[] name,
          boolean isCaseSensitive) {
    return plugin.inputMatches(input, name, isCaseSensitive);
  }
}