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package es.webbeta.serializer; |
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import com.google.common.collect.Lists; |
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import es.webbeta.serializer.base.Logger; |
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import es.webbeta.serializer.type.FieldAccessType; |
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import java.lang.reflect.Field; |
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import java.lang.reflect.InvocationTargetException; |
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import java.lang.reflect.Method; |
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import java.lang.reflect.Modifier; |
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import java.util.ArrayList; |
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import java.util.List; |
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public class FieldAccessor implements es.webbeta.serializer.base.FieldAccessor { |
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private Boolean initialized = false; |
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private Class<?> klass; |
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private List<Class<?>> klassTree; |
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private Object ob; |
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private String fieldName; |
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private FieldAccessType accessType; |
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private Logger logger; |
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private Boolean exists = false; |
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private Object value = null; |
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private Boolean ensureFieldExists = true; |
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private String customGetterName; |
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public FieldAccessor( |
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Object ob, |
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String fieldName, |
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FieldAccessType accessType |
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) { |
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this.ob = ob; |
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this.fieldName = fieldName; |
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this.accessType = accessType; |
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klass = ob.getClass(); |
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klassTree = new ArrayList<>(); |
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klassTree.add(klass); |
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} |
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public void setLogger(Logger logger) { |
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this.logger = logger; |
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} |
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private String[] buildGetterNames(String fieldName) { |
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List<String> names = new ArrayList<>(); |
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String firstLetter = fieldName.substring(0, 1); |
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names.add("get" + firstLetter.toUpperCase() + fieldName.substring(1)); |
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names.add("is" + firstLetter.toUpperCase() + fieldName.substring(1)); |
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return names.toArray(new String[0]); |
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} |
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private void init() { |
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if (initialized) return; |
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Class<?> superKlass = klass; |
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while (superKlass != null) { |
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superKlass = superKlass.getSuperclass(); |
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if (superKlass.getCanonicalName().equals(Object.class.getCanonicalName())) |
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break; |
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klassTree.add(superKlass); |
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} |
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klassTree = Lists.reverse(klassTree); |
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if (accessType == FieldAccessType.PROPERTY) |
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buildAsProperty(); |
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else if (accessType == FieldAccessType.PUBLIC_METHOD) |
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buildAsMethod(); |
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initialized = true; |
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} |
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@SuppressWarnings("all") |
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private void buildAsProperty() { |
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for (Class<?> klass : klassTree) { |
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try { |
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Field field = klass.getDeclaredField(fieldName); |
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if (!field.isAccessible()) |
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field.setAccessible(true); |
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value = field.get(ob); |
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exists = true; |
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} catch (IllegalAccessException e) { |
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if (logger != null) { |
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logger.error(String.format("Serializer cannot serialize field '%s.%s', because it is not public.", |
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klass.getCanonicalName(), |
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fieldName |
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)); |
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} |
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} catch (NoSuchFieldException ignored) {} |
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} |
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} |
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private void buildAsMethod() { |
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if (!Modifier.isPublic(klass.getModifiers())) |
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throw new IllegalAccessError("Serializer cannot access \"" + klass.getCanonicalName() + "\" class. It can be caused because it has non public access."); |
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String[] names; |
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if (customGetterName == null) |
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names = buildGetterNames(fieldName); |
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else |
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names = new String[]{customGetterName}; |
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for (String name : names) { |
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try { |
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Method method = klass.getMethod(name); |
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value = method.invoke(ob); |
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exists = true; |
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break; |
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} catch (NoSuchMethodException ignored) { |
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exists = false; |
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} catch (IllegalAccessException | InvocationTargetException e) { |
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if (logger != null) { |
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logger.error(String.format("Serializer cannot serialize method '%s.%s', because it %s", |
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klass.getCanonicalName(), name, |
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e instanceof IllegalAccessException ? "is not public." : |
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"throw an exception when was called." |
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)); |
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} |
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} |
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} |
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if (ensureFieldExists) { |
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FieldAccessor accessorAsField = |
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new FieldAccessor(ob, fieldName, FieldAccessType.PROPERTY); |
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exists = exists && accessorAsField.exists(); |
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if (!exists) |
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value = null; |
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} |
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} |
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public void setEnsureFieldExists(Boolean ensureFieldExists) { |
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this.ensureFieldExists = ensureFieldExists; |
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} |
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public void setCustomGetterName(String customGetterName) { |
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this.customGetterName = customGetterName; |
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} |
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@Override |
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public Boolean exists() { |
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init(); |
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return exists; |
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} |
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@SuppressWarnings("unchecked") |
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@Override |
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public <T> T get() { |
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init(); |
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return (T) value; |
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} |
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} |
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webbeta /
Serializer
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