diff --git a/build.gradle b/build.gradle
index c64d2a7..58a64e2 100644
--- a/build.gradle
+++ b/build.gradle
@@ -20,6 +20,7 @@ dependencies {
     annotationProcessor "org.projectlombok:lombok:${lombokVersion}"
     compile "commons-cli:commons-cli:${commonCliVersion}"
     compile "io.vavr:vavr:${vavrVersion}"
+    compile "com.github.javaparser:javaparser-core:${javaParserVersion}"
 }
 
 jar {
diff --git a/dependency-versions.gradle b/dependency-versions.gradle
index a9c4422..879c4c0 100644
--- a/dependency-versions.gradle
+++ b/dependency-versions.gradle
@@ -3,4 +3,5 @@ ext {
   lombokVersion = '1.18.6'
   commonCliVersion = '1.4'
   vavrVersion = '1.0.0-alpha-2'
+  javaParserVersion = '3.13.4'
 }
\ No newline at end of file
diff --git a/src/main/java/com/bartek/esa/core/archetype/AndroidManifestPlugin.java b/src/main/java/com/bartek/esa/core/archetype/AndroidManifestPlugin.java
new file mode 100644
index 0000000..b01718e
--- /dev/null
+++ b/src/main/java/com/bartek/esa/core/archetype/AndroidManifestPlugin.java
@@ -0,0 +1,20 @@
+package com.bartek.esa.core.archetype;
+
+import com.bartek.esa.core.xml.XmlHelper;
+import com.bartek.esa.file.matcher.GlobMatcher;
+
+import java.io.File;
+
+public abstract class AndroidManifestPlugin extends XmlPlugin {
+    private final GlobMatcher globMatcher;
+
+    public AndroidManifestPlugin(GlobMatcher globMatcher, XmlHelper xmlHelper) {
+        super(globMatcher, xmlHelper);
+        this.globMatcher = globMatcher;
+    }
+
+    @Override
+    public boolean supports(File file) {
+        return globMatcher.fileMatchesGlobPattern(file, "**/AndroidManifest.xml");
+    }
+}
diff --git a/src/main/java/com/bartek/esa/core/archetype/BasePlugin.java b/src/main/java/com/bartek/esa/core/archetype/BasePlugin.java
new file mode 100644
index 0000000..391ac16
--- /dev/null
+++ b/src/main/java/com/bartek/esa/core/archetype/BasePlugin.java
@@ -0,0 +1,55 @@
+package com.bartek.esa.core.archetype;
+
+import com.bartek.esa.core.model.enumeration.Severity;
+import com.bartek.esa.core.model.object.Issue;
+import org.w3c.dom.Document;
+
+import java.io.File;
+import java.util.ArrayList;
+import java.util.List;
+
+public abstract class BasePlugin implements Plugin {
+    private List<Issue> issues = new ArrayList<>();
+    private Document manifest;
+    private File file;
+
+    @Override
+    public void update(File file, Document manifest) {
+        this.file = file;
+        this.manifest = manifest;
+        this.issues.clear();
+    }
+
+    @Override
+    public List<Issue> runForIssues() {
+        run(file);
+        return issues;
+    }
+
+    protected abstract void run(File file);
+
+    protected void addIssue(Severity severity, Integer lineNumber, String line) {
+        addIssue(severity, "", lineNumber, line);
+    }
+
+    protected void addIssue(Severity severity, String descriptionCode, Integer lineNumber, String line) {
+        Issue issue = Issue.builder()
+                .severity(severity)
+                .issuer(this.getClass())
+                .descriptionCode(descriptionCode)
+                .file(file)
+                .lineNumber(lineNumber)
+                .line(line)
+                .build();
+
+        issues.add(issue);
+    }
+
+    protected File getOriginalFile() {
+        return file;
+    }
+
+    protected Document getManifest() {
+        return manifest;
+    }
+}
diff --git a/src/main/java/com/bartek/esa/core/archetype/JavaPlugin.java b/src/main/java/com/bartek/esa/core/archetype/JavaPlugin.java
new file mode 100644
index 0000000..f735329
--- /dev/null
+++ b/src/main/java/com/bartek/esa/core/archetype/JavaPlugin.java
@@ -0,0 +1,30 @@
+package com.bartek.esa.core.archetype;
+
+import com.bartek.esa.error.EsaException;
+import com.bartek.esa.file.matcher.GlobMatcher;
+import com.github.javaparser.StaticJavaParser;
+import com.github.javaparser.ast.CompilationUnit;
+import io.vavr.control.Try;
+
+import java.io.File;
+
+public abstract class JavaPlugin extends BasePlugin {
+    private final GlobMatcher globMatcher;
+
+    public JavaPlugin(GlobMatcher globMatcher) {
+        this.globMatcher = globMatcher;
+    }
+
+    @Override
+    public boolean supports(File file) {
+        return globMatcher.fileMatchesGlobPattern(file, "**/*.java");
+    }
+
+    @Override
+    protected void run(File file) {
+        CompilationUnit compilationUnit = Try.of(() -> StaticJavaParser.parse(file)).getOrElseThrow(EsaException::new);
+        run(compilationUnit);
+    }
+
+    public abstract void run(CompilationUnit compilationUnit);
+}
diff --git a/src/main/java/com/bartek/esa/core/archetype/Plugin.java b/src/main/java/com/bartek/esa/core/archetype/Plugin.java
new file mode 100644
index 0000000..ddbf1d4
--- /dev/null
+++ b/src/main/java/com/bartek/esa/core/archetype/Plugin.java
@@ -0,0 +1,13 @@
+package com.bartek.esa.core.archetype;
+
+import com.bartek.esa.core.model.object.Issue;
+import org.w3c.dom.Document;
+
+import java.io.File;
+import java.util.List;
+
+public interface Plugin {
+    boolean supports(File file);
+    void update(File file, Document manifest);
+    List<Issue> runForIssues();
+}
diff --git a/src/main/java/com/bartek/esa/core/archetype/ResourceLayoutPlugin.java b/src/main/java/com/bartek/esa/core/archetype/ResourceLayoutPlugin.java
new file mode 100644
index 0000000..aa924e7
--- /dev/null
+++ b/src/main/java/com/bartek/esa/core/archetype/ResourceLayoutPlugin.java
@@ -0,0 +1,20 @@
+package com.bartek.esa.core.archetype;
+
+import com.bartek.esa.core.xml.XmlHelper;
+import com.bartek.esa.file.matcher.GlobMatcher;
+
+import java.io.File;
+
+public abstract class ResourceLayoutPlugin extends XmlPlugin {
+    private final GlobMatcher globMatcher;
+
+    public ResourceLayoutPlugin(GlobMatcher globMatcher, XmlHelper xmlHelper) {
+        super(globMatcher, xmlHelper);
+        this.globMatcher = globMatcher;
+    }
+
+    @Override
+    public boolean supports(File file) {
+        return globMatcher.fileMatchesGlobPattern(file, "**/res/layout*/*.xml");
+    }
+}
diff --git a/src/main/java/com/bartek/esa/core/archetype/XmlPlugin.java b/src/main/java/com/bartek/esa/core/archetype/XmlPlugin.java
new file mode 100644
index 0000000..c1bbedd
--- /dev/null
+++ b/src/main/java/com/bartek/esa/core/archetype/XmlPlugin.java
@@ -0,0 +1,35 @@
+package com.bartek.esa.core.archetype;
+
+import com.bartek.esa.core.xml.XmlHelper;
+import com.bartek.esa.file.matcher.GlobMatcher;
+import org.w3c.dom.Document;
+
+import javax.xml.namespace.QName;
+import java.io.File;
+
+public abstract class XmlPlugin extends BasePlugin {
+    private final GlobMatcher globMatcher;
+    private final XmlHelper xmlHelper;
+
+    public XmlPlugin(GlobMatcher globMatcher, XmlHelper xmlHelper) {
+        this.globMatcher = globMatcher;
+        this.xmlHelper = xmlHelper;
+    }
+
+    @Override
+    public boolean supports(File file) {
+        return globMatcher.fileMatchesGlobPattern(file, "**/*.xml");
+    }
+
+    @Override
+    protected void run(File file) {
+        Document xml = xmlHelper.parseXml(file);
+        run(xml);
+    }
+
+    protected abstract void run(Document xml);
+
+    protected Object xPath(Document xml, String expression, QName returnType) {
+        return xmlHelper.xPath(xml, expression, returnType);
+    }
+}
diff --git a/src/main/java/com/bartek/esa/core/desc/provider/DescriptionProvider.java b/src/main/java/com/bartek/esa/core/desc/provider/DescriptionProvider.java
new file mode 100644
index 0000000..b5ac646
--- /dev/null
+++ b/src/main/java/com/bartek/esa/core/desc/provider/DescriptionProvider.java
@@ -0,0 +1,26 @@
+package com.bartek.esa.core.desc.provider;
+
+import com.bartek.esa.core.model.object.Issue;
+import com.bartek.esa.error.EsaException;
+import io.vavr.control.Try;
+
+import javax.inject.Inject;
+import java.util.Optional;
+import java.util.Properties;
+
+public class DescriptionProvider {
+    private static final String DESCRIPTION_FILE = "description.properties";
+    private final Properties descriptions = new Properties();
+
+    @Inject
+    public DescriptionProvider() {
+        Optional.ofNullable(DescriptionProvider.class.getClassLoader().getResourceAsStream(DESCRIPTION_FILE))
+                .ifPresent(p -> Try.run(() -> descriptions.load(p)).getOrElseThrow(EsaException::new));
+    }
+
+    public String getDescriptionForIssue(Issue issue) {
+        String code = issue.getIssuer().getCanonicalName() + issue.getDescriptionCode();
+        String description = descriptions.getProperty(code);
+        return description != null && !description.isEmpty() ? description : "No description provided.";
+    }
+}
diff --git a/src/main/java/com/bartek/esa/core/di/CoreModule.java b/src/main/java/com/bartek/esa/core/di/CoreModule.java
new file mode 100644
index 0000000..59d666d
--- /dev/null
+++ b/src/main/java/com/bartek/esa/core/di/CoreModule.java
@@ -0,0 +1,32 @@
+package com.bartek.esa.core.di;
+
+import com.bartek.esa.core.desc.provider.DescriptionProvider;
+import com.bartek.esa.core.executor.PluginExecutor;
+import com.bartek.esa.core.java.JavaSyntaxRegexProvider;
+import com.bartek.esa.core.xml.XmlHelper;
+import dagger.Module;
+import dagger.Provides;
+
+@Module
+public class CoreModule {
+
+    @Provides
+    public PluginExecutor pluginExecutor(XmlHelper xmlHelper) {
+        return new PluginExecutor(xmlHelper);
+    }
+
+    @Provides
+    public JavaSyntaxRegexProvider javaSyntaxRegexProvider() {
+        return new JavaSyntaxRegexProvider();
+    }
+
+    @Provides
+    public DescriptionProvider descriptionProvider() {
+        return new DescriptionProvider();
+    }
+
+    @Provides
+    public XmlHelper xmlHelper() {
+        return new XmlHelper();
+    }
+}
diff --git a/src/main/java/com/bartek/esa/core/executor/PluginExecutor.java b/src/main/java/com/bartek/esa/core/executor/PluginExecutor.java
new file mode 100644
index 0000000..e114489
--- /dev/null
+++ b/src/main/java/com/bartek/esa/core/executor/PluginExecutor.java
@@ -0,0 +1,40 @@
+package com.bartek.esa.core.executor;
+
+import com.bartek.esa.core.archetype.Plugin;
+import com.bartek.esa.core.model.object.Issue;
+import com.bartek.esa.core.xml.XmlHelper;
+import org.w3c.dom.Document;
+
+import javax.inject.Inject;
+import java.io.File;
+import java.util.List;
+
+import static java.util.stream.Collectors.toList;
+
+public class PluginExecutor {
+    private final XmlHelper xmlHelper;
+
+    @Inject
+    public PluginExecutor(XmlHelper xmlHelper) {
+        this.xmlHelper = xmlHelper;
+    }
+
+    public List<Issue> executeForFiles(File manifest, List<File> files, List<Plugin> plugins) {
+        return files.stream()
+                .map(file -> executeForFile(manifest, file, plugins))
+                .flatMap(List::stream)
+                .collect(toList());
+    }
+
+    private List<Issue> executeForFile(File manifest, File file, List<Plugin> plugins) {
+        Document xmlManifest = xmlHelper.parseXml(manifest);
+        return plugins.stream()
+                .filter(plugin -> plugin.supports(file))
+                .map(plugin -> {
+                    plugin.update(file, xmlManifest);
+                    return plugin.runForIssues();
+                })
+                .flatMap(List::stream)
+                .collect(toList());
+    }
+}
diff --git a/src/main/java/com/bartek/esa/core/java/JavaSyntaxRegexProvider.java b/src/main/java/com/bartek/esa/core/java/JavaSyntaxRegexProvider.java
new file mode 100644
index 0000000..d15c375
--- /dev/null
+++ b/src/main/java/com/bartek/esa/core/java/JavaSyntaxRegexProvider.java
@@ -0,0 +1,17 @@
+package com.bartek.esa.core.java;
+
+import javax.inject.Inject;
+
+import static java.lang.String.format;
+
+public class JavaSyntaxRegexProvider {
+
+    @Inject
+    public JavaSyntaxRegexProvider() {
+
+    }
+
+    public String methodInvocation(String methodName) {
+        return format("^%s\\s*\\($", methodName);
+    }
+}
diff --git a/src/main/java/com/bartek/esa/core/model/enumeration/Severity.java b/src/main/java/com/bartek/esa/core/model/enumeration/Severity.java
new file mode 100644
index 0000000..78b81ea
--- /dev/null
+++ b/src/main/java/com/bartek/esa/core/model/enumeration/Severity.java
@@ -0,0 +1,6 @@
+package com.bartek.esa.core.model.enumeration;
+
+public enum Severity {
+    WARNING,
+    ERROR
+}
diff --git a/src/main/java/com/bartek/esa/core/model/object/Issue.java b/src/main/java/com/bartek/esa/core/model/object/Issue.java
new file mode 100644
index 0000000..249250f
--- /dev/null
+++ b/src/main/java/com/bartek/esa/core/model/object/Issue.java
@@ -0,0 +1,18 @@
+package com.bartek.esa.core.model.object;
+
+import com.bartek.esa.core.model.enumeration.Severity;
+import lombok.Builder;
+import lombok.Data;
+
+import java.io.File;
+
+@Data
+@Builder
+public class Issue {
+    private final Class<?> issuer;
+    private final Severity severity;
+    private final String descriptionCode;
+    private final File file;
+    private final Integer lineNumber;
+    private final String line;
+}
diff --git a/src/main/java/com/bartek/esa/core/xml/XmlHelper.java b/src/main/java/com/bartek/esa/core/xml/XmlHelper.java
new file mode 100644
index 0000000..7a9ceee
--- /dev/null
+++ b/src/main/java/com/bartek/esa/core/xml/XmlHelper.java
@@ -0,0 +1,31 @@
+package com.bartek.esa.core.xml;
+
+import com.bartek.esa.error.EsaException;
+import io.vavr.control.Try;
+import org.w3c.dom.Document;
+
+import javax.inject.Inject;
+import javax.xml.namespace.QName;
+import javax.xml.parsers.DocumentBuilder;
+import javax.xml.parsers.DocumentBuilderFactory;
+import javax.xml.xpath.XPathFactory;
+import java.io.File;
+
+public class XmlHelper {
+
+    @Inject
+    public XmlHelper() {
+
+    }
+
+    public Document parseXml(File file) {
+        DocumentBuilderFactory factory = DocumentBuilderFactory.newDefaultInstance();
+        DocumentBuilder builder = Try.of(factory::newDocumentBuilder).getOrElseThrow(EsaException::new);
+        return Try.of(() -> builder.parse(file)).getOrElseThrow(EsaException::new);
+    }
+
+    public Object xPath(Document xml, String expression, QName returnType) {
+        return Try.of(() -> XPathFactory.newDefaultInstance().newXPath().evaluate(expression, xml, returnType))
+                .getOrElseThrow(EsaException::new);
+    }
+}
diff --git a/src/main/java/com/bartek/esa/di/DependencyInjector.java b/src/main/java/com/bartek/esa/di/DependencyInjector.java
index e3c449e..b05f447 100644
--- a/src/main/java/com/bartek/esa/di/DependencyInjector.java
+++ b/src/main/java/com/bartek/esa/di/DependencyInjector.java
@@ -2,6 +2,7 @@ package com.bartek.esa.di;
 
 import com.bartek.esa.EsaMain;
 import com.bartek.esa.cli.di.CliModule;
+import com.bartek.esa.core.di.CoreModule;
 import com.bartek.esa.decompiler.di.DecompilerModule;
 import com.bartek.esa.dispatcher.di.DispatcherModule;
 import com.bartek.esa.file.di.FileModule;
@@ -11,7 +12,8 @@ import dagger.Component;
         CliModule.class,
         DispatcherModule.class,
         FileModule.class,
-        DecompilerModule.class
+        DecompilerModule.class,
+        CoreModule.class
 })
 public interface DependencyInjector {
     EsaMain esa();
diff --git a/src/main/java/com/bartek/esa/file/di/FileModule.java b/src/main/java/com/bartek/esa/file/di/FileModule.java
index adcbd99..815b3d4 100644
--- a/src/main/java/com/bartek/esa/file/di/FileModule.java
+++ b/src/main/java/com/bartek/esa/file/di/FileModule.java
@@ -1,5 +1,7 @@
 package com.bartek.esa.file.di;
 
+import com.bartek.esa.file.matcher.GlobMatcher;
+import com.bartek.esa.file.provider.FileContentProvider;
 import com.bartek.esa.file.provider.FileProvider;
 import dagger.Module;
 import dagger.Provides;
@@ -8,7 +10,17 @@ import dagger.Provides;
 public class FileModule {
 
     @Provides
-    public FileProvider fileProvider() {
-        return new FileProvider();
+    public FileProvider fileProvider(GlobMatcher globMatcher) {
+        return new FileProvider(globMatcher);
+    }
+
+    @Provides
+    public FileContentProvider fileContentProvider() {
+        return new FileContentProvider();
+    }
+
+    @Provides
+    public GlobMatcher globMatcher() {
+        return new GlobMatcher();
     }
 }
diff --git a/src/main/java/com/bartek/esa/file/matcher/GlobMatcher.java b/src/main/java/com/bartek/esa/file/matcher/GlobMatcher.java
new file mode 100644
index 0000000..58d9a1d
--- /dev/null
+++ b/src/main/java/com/bartek/esa/file/matcher/GlobMatcher.java
@@ -0,0 +1,22 @@
+package com.bartek.esa.file.matcher;
+
+import javax.inject.Inject;
+import java.io.File;
+import java.nio.file.FileSystems;
+import java.nio.file.Path;
+
+public class GlobMatcher {
+
+    @Inject
+    public GlobMatcher() {
+
+    }
+
+    public boolean fileMatchesGlobPattern(File file, String globPattern) {
+        return pathMatchesGlobPattern(file.toPath(), globPattern);
+    }
+
+    public boolean pathMatchesGlobPattern(Path path, String globPattern) {
+        return FileSystems.getDefault().getPathMatcher("glob:" + globPattern).matches(path);
+    }
+}
diff --git a/src/main/java/com/bartek/esa/file/model/FoundLine.java b/src/main/java/com/bartek/esa/file/model/FoundLine.java
new file mode 100644
index 0000000..05cd59a
--- /dev/null
+++ b/src/main/java/com/bartek/esa/file/model/FoundLine.java
@@ -0,0 +1,12 @@
+package com.bartek.esa.file.model;
+
+import lombok.Builder;
+import lombok.Data;
+
+@Data
+@Builder
+public class FoundLine {
+    private int number;
+    private String line;
+    private int position;
+}
diff --git a/src/main/java/com/bartek/esa/file/provider/FileContentProvider.java b/src/main/java/com/bartek/esa/file/provider/FileContentProvider.java
new file mode 100644
index 0000000..195d908
--- /dev/null
+++ b/src/main/java/com/bartek/esa/file/provider/FileContentProvider.java
@@ -0,0 +1,63 @@
+package com.bartek.esa.file.provider;
+
+import com.bartek.esa.error.EsaException;
+import com.bartek.esa.file.model.FoundLine;
+import io.vavr.control.Try;
+
+import javax.inject.Inject;
+import java.io.File;
+import java.io.FileReader;
+import java.io.IOException;
+import java.io.LineNumberReader;
+import java.nio.file.Files;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.regex.Pattern;
+
+public class FileContentProvider {
+
+    @Inject
+    public FileContentProvider() {
+
+    }
+
+    public List<FoundLine> findPhraseByLines(File file, String regex) {
+        try {
+            return tryToFindPhraseByLines(file, regex);
+        } catch (IOException e) {
+            throw new EsaException(e);
+        }
+    }
+
+    private List<FoundLine> tryToFindPhraseByLines(File file, String regex) throws IOException {
+        LineNumberReader lineNumberReader = readForLines(file);
+        List<FoundLine> foundLines = new ArrayList<>();
+
+        String line;
+        Pattern pattern = Pattern.compile(regex);
+        while ((line = lineNumberReader.readLine()) != null) {
+            if (pattern.matcher(line).find()) {
+                foundLines.add(FoundLine.builder()
+                        .line(line)
+                        .number(lineNumberReader.getLineNumber())
+                        .build());
+            }
+        }
+
+        return foundLines;
+    }
+
+    private LineNumberReader readForLines(File file) {
+        return Try.of(() -> new LineNumberReader(new FileReader(file)))
+                .getOrElseThrow(EsaException::new);
+    }
+
+    public String readFile(File file) {
+        StringBuilder content = new StringBuilder();
+        Try.run(() -> Files.lines(file.toPath())
+                .map(line -> line + "\n")
+                .forEach(content::append));
+
+        return content.toString();
+    }
+}
diff --git a/src/main/java/com/bartek/esa/file/provider/FileProvider.java b/src/main/java/com/bartek/esa/file/provider/FileProvider.java
index b3cbd3e..b058d37 100644
--- a/src/main/java/com/bartek/esa/file/provider/FileProvider.java
+++ b/src/main/java/com/bartek/esa/file/provider/FileProvider.java
@@ -1,6 +1,7 @@
 package com.bartek.esa.file.provider;
 
 import com.bartek.esa.error.EsaException;
+import com.bartek.esa.file.matcher.GlobMatcher;
 import io.vavr.control.Try;
 
 import javax.inject.Inject;
@@ -12,10 +13,12 @@ import java.util.Set;
 import java.util.stream.Collectors;
 
 public class FileProvider {
+    private final GlobMatcher globMatcher;
 
     @Inject
-    public FileProvider() {
+    public FileProvider(GlobMatcher globMatcher) {
 
+        this.globMatcher = globMatcher;
     }
 
     public File createTemporaryDirectory() {
@@ -24,58 +27,11 @@ public class FileProvider {
                 .toFile();
     }
 
-    public String readFile(File file) {
-        StringBuilder content = new StringBuilder();
-        Try.run(() -> Files.lines(file.toPath())
-                .map(line -> line + "\n")
-                .forEach(content::append));
-
-        return content.toString();
-    }
-
-    public Set<File> findFilesRecursively(String path, String globPattern) {
-        return findFilesRecursivelyInSubpath(path, "", globPattern);
-    }
-
-    public Set<File> findFilesRecursivelyInSubpath(String path, String subpath, String globPattern) {
+    public Set<File> getGlobMatchedFiles(String path, String globPattern) {
         return Try.of(() -> Files.walk(Paths.get(path))
-                .filter(p -> p.toString().contains(subpath))
-                .filter(p -> matchesGlobPattern(p.getFileName().toString(), globPattern))
+                .filter(p -> globMatcher.pathMatchesGlobPattern(p, globPattern))
                 .map(Path::toFile)
                 .collect(Collectors.toSet()))
                 .getOrElseThrow(EsaException::new);
     }
-
-    public boolean matchesGlobPattern(String filename, String globPattern) {
-        return filename.matches(createRegexFromGlob(globPattern));
-    }
-
-    private String createRegexFromGlob(String glob) {
-        StringBuilder out = new StringBuilder("^");
-
-        glob
-                .chars()
-                .mapToObj(i -> (char) i)
-                .map(this::globCharacterToRegexString)
-                .forEach(out::append);
-
-        out.append('$');
-
-        return out.toString();
-    }
-
-    private String globCharacterToRegexString(char character) {
-        switch (character) {
-            case '*':
-                return ".*";
-            case '?':
-                return ".";
-            case '.':
-                return "\\.";
-            case '\\':
-                return "\\\\";
-            default:
-                return String.valueOf(character);
-        }
-    }
 }
diff --git a/src/main/resources/description.properties b/src/main/resources/description.properties
new file mode 100644
index 0000000..e69de29