ProcessorDef.java

/*
 * #%L
 * Native ARchive plugin for Maven
 * %%
 * Copyright (C) 2002 - 2014 NAR Maven Plugin developers.
 * %%
 * 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.
 * #L%
 */
package com.github.maven_nar.cpptasks;

import java.io.File;
import java.lang.reflect.Method;
import java.util.Vector;

import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.DirectoryScanner;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.types.DataType;
import org.apache.tools.ant.types.Environment;
import org.apache.tools.ant.types.Reference;

import com.github.maven_nar.cpptasks.compiler.LinkType;
import com.github.maven_nar.cpptasks.compiler.Processor;
import com.github.maven_nar.cpptasks.compiler.ProcessorConfiguration;
import com.github.maven_nar.cpptasks.types.CommandLineArgument;
import com.github.maven_nar.cpptasks.types.ConditionalFileSet;

/**
 * An abstract compiler/linker definition.
 *
 * @author Curt Arnold
 */
public abstract class ProcessorDef extends DataType {
  /**
   * Returns the equivalent Boolean object for the specified value
   * 
   * Equivalent to Boolean.valueOf in JDK 1.4
   * 
   * @param val
   *          boolean value
   * @return Boolean.TRUE or Boolean.FALSE
   */
  protected static Boolean booleanValueOf(final boolean val) {
    if (val) {
      return Boolean.TRUE;
    }
    return Boolean.FALSE;
  }

  /**
   * if true, targets will be built for debugging
   */
  private Boolean debug;
  private Environment env = null;
  /**
   * Reference for "extends" processor definition
   */
  private Reference extendsRef = null;
  /**
   * Name of property that must be present or definition will be ignored. May
   * be null.
   */
  private String ifProp;
  /**
   * if true, processor definition inherits values from containing cc
   * element
   */
  private boolean inherit;
  private Boolean libtool = null;
  protected boolean newEnvironment = false;
  /**
   * Processor.
   */
  private Processor processor;
  /**
   * Collection of <compilerarg>or <linkerarg>contained by definition
   */
  private final Vector processorArgs = new Vector();
  /**
   * Collection of <compilerparam>or <linkerparam>contained by definition
   */
  private final Vector processorParams = new Vector();
  /**
   * if true, all targets will be unconditionally rebuilt
   */
  private Boolean rebuild;
  /**
   * Collection of <fileset>contained by definition
   */
  private final Vector srcSets = new Vector();
  /**
   * Name of property that if present will cause definition to be ignored.
   * May be null.
   */
  private String unlessProp;

  /**
   * Constructor
   * 
   */
  protected ProcessorDef() throws NullPointerException {
    this.inherit = true;
  }

  /**
   * Adds a <compilerarg>or <linkerarg>
   * 
   * @param arg
   *          command line argument, must not be null
   * @throws NullPointerException
   *           if arg is null
   * @throws BuildException
   *           if this definition is a reference
   */
  protected void addConfiguredProcessorArg(final CommandLineArgument arg) throws NullPointerException, BuildException {
    if (arg == null) {
      throw new NullPointerException("arg");
    }
    if (isReference()) {
      throw noChildrenAllowed();
    }
    this.processorArgs.addElement(arg);
  }

  /**
   * Adds a <compilerarg>or <linkerarg>
   * 
   * @param param
   *          command line argument, must not be null
   * @throws NullPointerException
   *           if arg is null
   * @throws BuildException
   *           if this definition is a reference
   */
  protected void addConfiguredProcessorParam(final ProcessorParam param) throws NullPointerException, BuildException {
    if (param == null) {
      throw new NullPointerException("param");
    }
    if (isReference()) {
      throw noChildrenAllowed();
    }
    this.processorParams.addElement(param);
  }

  /**
   * Add an environment variable to the launched process.
   */
  public void addEnv(final Environment.Variable var) {
    if (this.env == null) {
      this.env = new Environment();
      this.newEnvironment = true;
      if (this.processor != null) {
        // Change the environment in the processor
        setProcessor(this.processor);
      }
    }
    this.env.addVariable(var);
  }

  /**
   * Adds a source file set.
   * 
   * Files in these set will be processed by this configuration and will not
   * participate in the auction.
   * 
   * @param srcSet
   *          Fileset identifying files that should be processed by this
   *          processor
   * @throws BuildException
   *           if processor definition is a reference
   */
  public void addFileset(final ConditionalFileSet srcSet) throws BuildException {
    if (isReference()) {
      throw noChildrenAllowed();
    }
    srcSet.setProject(getProject());
    this.srcSets.addElement(srcSet);
  }

  /**
   * Creates a configuration
   * 
   * @param baseDef
   *          reference to def from containing cc element, may be null
   * @return configuration
   * 
   */
  public ProcessorConfiguration createConfiguration(final CCTask task, final LinkType linkType,
      final ProcessorDef baseDef, final TargetDef targetPlatform, final VersionInfo versionInfo) {
    if (isReference()) {
      return ((ProcessorDef) getCheckedRef(ProcessorDef.class, "ProcessorDef")).createConfiguration(task, linkType,
          baseDef, targetPlatform, versionInfo);
    }
    final ProcessorDef[] defaultProviders = getDefaultProviders(baseDef);
    final Processor proc = getProcessor(linkType);
    return proc.createConfiguration(task, linkType, defaultProviders, this, targetPlatform, versionInfo);
  }

  /**
   * Prepares list of processor arguments ( compilerarg, linkerarg ) that
   * are active for the current project settings.
   * 
   * @return active compiler arguments
   */
  public CommandLineArgument[] getActiveProcessorArgs() {
    final Project p = getProject();
    if (p == null) {
      throw new java.lang.IllegalStateException("project must be set");
    }
    if (isReference()) {
      return ((ProcessorDef) getCheckedRef(ProcessorDef.class, "ProcessorDef")).getActiveProcessorArgs();
    }
    final Vector activeArgs = new Vector(this.processorArgs.size());
    for (int i = 0; i < this.processorArgs.size(); i++) {
      final CommandLineArgument arg = (CommandLineArgument) this.processorArgs.elementAt(i);
      if (arg.isActive(p)) {
        activeArgs.addElement(arg);
      }
    }
    final CommandLineArgument[] array = new CommandLineArgument[activeArgs.size()];
    activeArgs.copyInto(array);
    return array;
  }

  /**
   * Prepares list of processor arguments ( compilerarg, linkerarg) that
   * are active for the current project settings.
   * 
   * @return active compiler arguments
   */
  public ProcessorParam[] getActiveProcessorParams() {
    final Project p = getProject();
    if (p == null) {
      throw new java.lang.IllegalStateException("project must be set");
    }
    if (isReference()) {
      return ((ProcessorDef) getCheckedRef(ProcessorDef.class, "ProcessorDef")).getActiveProcessorParams();
    }
    final Vector activeParams = new Vector(this.processorParams.size());
    for (int i = 0; i < this.processorParams.size(); i++) {
      final ProcessorParam param = (ProcessorParam) this.processorParams.elementAt(i);
      if (param.isActive(p)) {
        activeParams.addElement(param);
      }
    }
    final ProcessorParam[] array = new ProcessorParam[activeParams.size()];
    activeParams.copyInto(array);
    return array;
  }

  /**
   * Gets boolean indicating debug build
   * 
   * @param defaultProviders
   *          array of ProcessorDef's in descending priority
   * @param index
   *          index to first element in array that should be considered
   * @return if true, built targets for debugging
   */
  public boolean getDebug(final ProcessorDef[] defaultProviders, final int index) {
    if (isReference()) {
      return ((ProcessorDef) getCheckedRef(ProcessorDef.class, "ProcessorDef")).getDebug(defaultProviders, index);
    }
    if (this.debug != null) {
      return this.debug.booleanValue();
    } else {
      if (defaultProviders != null && index < defaultProviders.length) {
        return defaultProviders[index].getDebug(defaultProviders, index + 1);
      }
    }
    return false;
  }

  /**
   * Creates an chain of objects which provide default values in descending
   * order of significance.
   * 
   * @param baseDef
   *          corresponding ProcessorDef from CCTask, will be last element
   *          in array unless inherit = false
   * @return default provider array
   * 
   */
  protected final ProcessorDef[] getDefaultProviders(final ProcessorDef baseDef) {
    ProcessorDef extendsDef = getExtends();
    final Vector chain = new Vector();
    while (extendsDef != null && !chain.contains(extendsDef)) {
      chain.addElement(extendsDef);
      extendsDef = extendsDef.getExtends();
    }
    if (baseDef != null && getInherit()) {
      chain.addElement(baseDef);
    }
    final ProcessorDef[] defaultProviders = new ProcessorDef[chain.size()];
    chain.copyInto(defaultProviders);
    return defaultProviders;
  }

  /**
   * Because linkers have multiples and none of them share the environment
   * settings here is a hack to give direct access to copy it just before
   * running
   * 
   * @return
   */
  public Environment getEnv() {
    return this.env;
  }

  /**
   * Gets the ProcessorDef specified by the extends attribute
   * 
   * @return Base ProcessorDef, null if extends is not specified
   * @throws BuildException
   *           if reference is not same type object
   */
  public ProcessorDef getExtends() throws BuildException {
    if (this.extendsRef != null) {
      final Object obj = this.extendsRef.getReferencedObject(getProject());
      if (!getClass().isInstance(obj)) {
        throw new BuildException("Referenced object " + this.extendsRef.getRefId() + " not correct type, is "
            + obj.getClass().getName() + " should be " + getClass().getName());
      }
      return (ProcessorDef) obj;
    }
    return null;
  }

  /**
   * Gets the inherit attribute. If the inherit value is true, this processor
   * definition will inherit default values from the containing cc element.
   * 
   * @return if true then properties from the containing <cc>element are
   *         used.
   */
  public final boolean getInherit() {
    return this.inherit;
  }

  public boolean getLibtool() {
    if (this.libtool != null) {
      return this.libtool.booleanValue();
    }
    if (isReference()) {
      return ((ProcessorDef) getCheckedRef(ProcessorDef.class, "ProcessorDef")).getLibtool();
    }
    final ProcessorDef extendsDef = getExtends();
    if (extendsDef != null) {
      return extendsDef.getLibtool();
    }
    return false;
  }

  /**
   * Obtains the appropriate processor (compiler, linker)
   * 
   * @return processor
   */
  protected Processor getProcessor() {
    if (isReference()) {
      return ((ProcessorDef) getCheckedRef(ProcessorDef.class, "ProcessorDef")).getProcessor();
    }
    //
    // if a processor has not been explicitly set
    // then may be set by an extended definition
    if (this.processor == null) {
      final ProcessorDef extendsDef = getExtends();
      if (extendsDef != null) {
        return extendsDef.getProcessor();
      }
    }
    return this.processor;
  }

  /**
   * Obtains the appropriate processor (compiler, linker) based on the
   * LinkType.
   *
   * @return processor
   */
  protected Processor getProcessor(final LinkType linkType) {
    // by default ignore the linkType.
    return getProcessor();
  }

  /**
   * Gets a boolean value indicating whether all targets must be rebuilt
   * regardless of dependency analysis.
   * 
   * @param defaultProviders
   *          array of ProcessorDef's in descending priority
   * @param index
   *          index to first element in array that should be considered
   * @return true if all targets should be rebuilt.
   */
  public boolean getRebuild(final ProcessorDef[] defaultProviders, final int index) {
    if (isReference()) {
      return ((ProcessorDef) getCheckedRef(ProcessorDef.class, "ProcessorDef")).getRebuild(defaultProviders, index);
    }
    if (this.rebuild != null) {
      return this.rebuild.booleanValue();
    } else {
      if (defaultProviders != null && index < defaultProviders.length) {
        return defaultProviders[index].getRebuild(defaultProviders, index + 1);
      }
    }
    return false;
  }

  /**
   * Returns true if the processor definition contains embedded file set
   * definitions
   * 
   * @return true if processor definition contains embedded filesets
   */
  public boolean hasFileSets() {
    if (isReference()) {
      return ((ProcessorDef) getCheckedRef(ProcessorDef.class, "ProcessorDef")).hasFileSets();
    }
    return this.srcSets.size() > 0;
  }

  /**
   * Determine if this def should be used.
   * 
   * Definition will be active if the "if" variable (if specified) is set and
   * the "unless" variable (if specified) is not set and that all reference
   * or extended definitions are active
   * 
   * @return true if processor is active
   * @throws IllegalStateException
   *           if not properly initialized
   * @throws BuildException
   *           if "if" or "unless" variable contains suspicious values
   *           "false" or "no" which indicates possible confusion
   */
  public boolean isActive() throws BuildException, IllegalStateException {
    final Project project = getProject();
    if (!CUtil.isActive(project, this.ifProp, this.unlessProp)) {
      return false;
    }
    if (isReference() && !((ProcessorDef) getCheckedRef(ProcessorDef.class, "ProcessorDef")).isActive()) {
        return false;
    }
    //
    // walk through any extended definitions
    //
    final ProcessorDef[] defaultProviders = getDefaultProviders(null);
    for (final ProcessorDef defaultProvider : defaultProviders) {
      if (!defaultProvider.isActive()) {
        return false;
      }
    }
    return true;
  }

  /**
   * Sets the class name for the adapter. Use the "name" attribute when the
   * tool is supported.
   * 
   * @param className
   *          full class name
   * 
   */
  public void setClassname(final String className) throws BuildException {
    Object proc = null;
    try {
      final Class implClass = ProcessorDef.class.getClassLoader().loadClass(className);
      try {
        final Method getInstance = implClass.getMethod("getInstance");
        proc = getInstance.invoke(null);
      } catch (final Exception ex) {
        proc = implClass.newInstance();
      }
    } catch (final Exception ex) {
      throw new BuildException(ex);
    }
    setProcessor((Processor) proc);
  }

  /**
   * If set true, all targets will be built for debugging.
   * 
   * @param debug
   *          true if targets should be built for debugging
   * @throws BuildException
   *           if processor definition is a reference
   */
  public void setDebug(final boolean debug) throws BuildException {
    if (isReference()) {
      throw tooManyAttributes();
    }
    this.debug = booleanValueOf(debug);
  }

  /**
   * Sets a description of the current data type.
   */
  @Override
  public void setDescription(final String desc) {
    super.setDescription(desc);
  }

  /**
   * Specifies that this element extends the element with id attribute with a
   * matching value. The configuration will be constructed from the settings
   * of this element, element referenced by extends, and the containing cc
   * element.
   * 
   * @param extendsRef
   *          Reference to the extended processor definition.
   * @throws BuildException
   *           if this processor definition is a reference
   */
  public void setExtends(final Reference extendsRef) throws BuildException {
    if (isReference()) {
      throw tooManyAttributes();
    }
    this.extendsRef = extendsRef;
  }

  /**
   * Sets an id that can be used to reference this element.
   * 
   * @param id
   *          id
   */
  public void setId(final String id) {
    //
    // this is actually accomplished by a different
    // mechanism, but we can document it
    //
  }

  /**
   * Sets the property name for the 'if' condition.
   * 
   * The configuration will be ignored unless the property is defined.
   * 
   * The value of the property is insignificant, but values that would imply
   * misinterpretation ("false", "no") will throw an exception when
   * evaluated.
   * 
   * @param propName
   *          name of property
   */
  public void setIf(final String propName) {
    this.ifProp = propName;
  }

  /**
   * If inherit has the default value of true, defines, includes and other
   * settings from the containing cc element will be inherited.
   * 
   * @param inherit
   *          new value
   * @throws BuildException
   *           if processor definition is a reference
   */
  public void setInherit(final boolean inherit) throws BuildException {
    if (isReference()) {
      throw super.tooManyAttributes();
    }
    this.inherit = inherit;
  }

  /**
   * Set use of libtool.
   * 
   * If set to true, the "libtool " will be prepended to the command line
   * 
   * @param libtool
   *          If true, use libtool.
   */
  public void setLibtool(final boolean libtool) {
    if (isReference()) {
      throw tooManyAttributes();
    }
    this.libtool = booleanValueOf(libtool);
  }

  /**
   * Do not propagate old environment when new environment variables are
   * specified.
   */
  public void setNewenvironment(final boolean newenv) {
    this.newEnvironment = newenv;
  }
  public boolean isNewEnvironment() {
    return this.newEnvironment;
  }

  /**
   * Sets the processor
   * 
   * @param processor
   *          processor, may not be null.
   * @throws BuildException
   *           if ProcessorDef is a reference
   * @throws NullPointerException
   *           if processor is null
   */
  protected void setProcessor(final Processor processor) throws BuildException, NullPointerException {
    if (processor == null) {
      throw new NullPointerException("processor");
    }
    if (isReference()) {
      throw super.tooManyAttributes();
    }
    if (this.env == null && !this.newEnvironment) {
      this.processor = processor;
    } else {
      this.processor = processor.changeEnvironment(this.newEnvironment, this.env);
    }
  }

  /**
   * If set true, all targets will be unconditionally rebuilt.
   * 
   * @param rebuild
   *          if true, rebuild all targets.
   * @throws BuildException
   *           if processor definition is a reference
   */
  public void setRebuild(final boolean rebuild) throws BuildException {
    if (isReference()) {
      throw tooManyAttributes();
    }
    this.rebuild = booleanValueOf(rebuild);
  }

  /**
   * Specifies that this element should behave as if the content of the
   * element with the matching id attribute was inserted at this location. If
   * specified, no other attributes or child content should be specified,
   * other than "if", "unless" and "description".
   * 
   * @param ref
   *          Reference to other element
   * 
   */
  @Override
  public void setRefid(final org.apache.tools.ant.types.Reference ref) {
    super.setRefid(ref);
  }

  /**
   * Set the property name for the 'unless' condition.
   * 
   * If named property is set, the configuration will be ignored.
   * 
   * The value of the property is insignificant, but values that would imply
   * misinterpretation ("false", "no") of the behavior will throw an
   * exception when evaluated.
   * 
   * @param propName
   *          name of property
   */
  public void setUnless(final String propName) {
    this.unlessProp = propName;
  }

  /**
   * This method calls the FileVistor's visit function for every file in the
   * processors definition
   * 
   * @param visitor
   *          object whose visit method is called for every file
   */
  public void visitFiles(final FileVisitor visitor) {
    final Project p = getProject();
    if (p == null) {
      throw new java.lang.IllegalStateException("project must be set before this call");
    }
    if (isReference()) {
      ((ProcessorDef) getCheckedRef(ProcessorDef.class, "ProcessorDef")).visitFiles(visitor);
    }
    //
    // if this processor extends another,
    // visit its files first
    //
    final ProcessorDef extendsDef = getExtends();
    if (extendsDef != null) {
      extendsDef.visitFiles(visitor);
    }

    for (int i = 0; i < this.srcSets.size(); i++) {
      final ConditionalFileSet srcSet = (ConditionalFileSet) this.srcSets.elementAt(i);
      if (srcSet.isActive()) {
        // Find matching source files
        final DirectoryScanner scanner = srcSet.getDirectoryScanner(p);
        // Check each source file - see if it needs compilation
        final String[] fileNames = scanner.getIncludedFiles();
        final File parentDir = scanner.getBasedir();
        for (final String currentFile : fileNames) {
          visitor.visit(parentDir, currentFile);
        }
      }
    }
  }
}